FRIEDRICH VHA-09K25RTP Air Conditioner Owner’s Manual
- June 13, 2024
- FRIEDRICH
Table of Contents
VHA-09K25RTP Air Conditioner
Product Information
The VERT-I-PAK is a service manual for standard chassis models.
It provides important safety information, specifications, operation
details, troubleshooting guides, and component testing instructions
for various models.
Models
-
9K Models: VHA – 09K25RTP, 09K34RTP, 09K50RTP; VHA – 09R25RTP,
09R34RTP, 09R50RTP -
12K Models: VHA – 12K25RTP, 12K34RTP, 12K50RTP; VHA – 12R25RTP,
12R34RTP, 12R50RTP -
18K Models: VHA – 18K25RTP, 18K34RTP, 18K50RTP, 18K75RTP; VHA –
18R25RTP, 18R34RTP, 18R50RTP, 18K75RTP -
24K Models: VHA – 24K25RTP, 24K34RTP, 24K50RTP, 24K75RTP,
24K10RTP; VHA – 24R25RTP, 24R34RTP, 24R50RTP, 24R75RTP,
24R10RTP
Table of Contents
- Introduction
- Important Safety Information
- Operation of Equipment During Construction
- Equipment Identification
- Specifications
- Operation
- Remove and Install the Chassis
- External Static Pressure
- Troubleshooting
- Component Testing
- R-410A Sealed System Repair
Electrical Data
- 208/230v 9K BTU and 12K BTU
- 265v 9K BTU and 12K BTU
Product Usage Instructions
To use the VERT-I-PAK service manual effectively, follow these
instructions:
-
Read the important safety information section to understand
potential hazards and precautions before operating the
equipment. -
Refer to the equipment identification section to locate the
model and serial number of your VERT-I-PAK unit. -
Consult the specifications section for general specifications,
chassis specifications, dimensions, and electrical data. -
Understand the operation of the equipment by reading about
electronic control board features, sequence of operation, and
various control options. -
If needed, learn how to remove and install the chassis for
servicing or quick changeouts. -
Check external static pressure using the provided instructions
and charts. -
If any issues arise, refer to the troubleshooting section to
identify error codes, alarms, and follow the electrical
troubleshooting charts to diagnose and resolve problems. -
If component testing is required, follow the instructions
provided to test and check various components such as the reversing
valve, compressor, fan motor, capacitors, heating element, and
more. -
For R-410A sealed system repair, follow the instructions for
refrigerant charging, undercharged/overcharged systems, and
restricted refrigerant systems.
It is recommended to consult the VERT-I-PAK service manual for
detailed step-by-step instructions, diagrams, and additional
information related to specific models and scenarios.
VERT-I-PAK
Service Manual
Standard Chassis Models
9K
VHA – 09K25RTP, 09K34RTP, 09K50RTP VHA – 09R25RTP, 09R34RTP, 09R50RTP
12K 18K
VHA – 12K25RTP, 12K34RTP, 12K50RTP VHA – 12R25RTP, 12R34RTP, 12R50RTP
VHA – 18K25RTP, 18K34RTP, 18K50RTP, 18K75RTP VHA – 18R25RTP, 18R34RTP,
18R50RTP, 18K75RTP
24K
VHA – 24K25RTP, 24K34RTP, 24K50RTP, 24K75RTP, 24K10RTP VHA – 24R25RTP, 24R34RTP, 24R50RTP, 24R75RTP, 24R10RTP
1 95992012_04
Table of Contents
INTRODUCTION
4
Important Safety Information
4
Personal Injury Or Death Hazards
5
Operation of Equipment in During Construction
7
Equipment Identification
8
Model and Serial Number Location
8
Model and Serial Number information is found on the Manufacturer’s DATA TAG, located on the front or top.
8
Model Number Reference Guide
9
Serial Number Reference Guide
10
SPECIFICATIONS
11
General Specifications -A Models
11
SPECIFICATIONS
12
General Specifications -B Models
12
Chassis Specifications 9K, 12K
13
18K Dimensions
14
24K Dimensions
15
Electrical Data (208/ 230v 9K btu and 12K BTU)
16
Electrical Data (265v 9K and 12K BTU)
17
Electrical Requirements
20
Electrical Ratings Table
20
Supply Air Flow and Data
22
OPERATION
24
Electronic Control Board Features
24
Electronic Sequence of Operation
25
Compressor Lock Out Time
26
Cooling Fan Delay
26
Heating Fan Delay
26
Fan Speed Change Delay
26
Room Air Sampling Feature
26
Low Voltage Interface Connections
26
Interface Connector Definitions
26
Remote Wall Thermostat
27
Remote Wall Thermostat Location
28
Desk Control
28
Auxiliary Fan Control
28
Unit Heat Control Operation – Heat Pump With Electric Heat
29
General Knowledge Sequence Of Refrigeration
30
REMOVE AND INSTALL THE CHASSIS
32
Remove The Chassis
32
Servicing / Chassis Quick Changeouts
32
To Remove the Chassis from the Closet:
32
EXTERNAL STATIC PRESSURE
33
Checking External Static Pressure
33
Explanation of charts
34
Indoor Airflow Data
34
Ductwork Preparation
34
Fresh Air Door
35
Checking Approximate Airflow
35
Electric Heat Strips
35
TROUBLESHOOTING
36
Error Codes and Alarm Status
36
Electrical Troubleshooting Chart – Cooling
38
9K Btu, 12K Btu, & 18K Btu
38
24K Btu
39
Electrical Troubleshooting Chart – Heat Pump
40
Troubleshooting Chart – Cooling
41
COMPONENT TESTING
42
Capillary Tube and Check Valve Assy (Heat Pump Units)
42
Capillary Tube Assy (Cool Only Units)
43
Reversing Valve Description And Operation
44
2
Testing The Reversing Valve Solenoid Coil
45
Checking The Reversing Valve
46
Touch Test Chart : To Service Reversing Valves
47
Compressor Checks
48
Fan Motor
50
Capacitors
50
Heating Element and Limit Switch
51
Heater Elements And Limit Switches’ Specifications
51
Drain Pan Valve
53
Testing the Diagnostic Service Module
54
Testing the Electronic Control Board
54
Electronic Control Board Components Identification And Testing
55
24k Indoor Blower Motor
56
R-410A SEALED SYSTEM REPAIR
57
Refrigerant Charging
58
Undercharged Refrigerant Systems
59
An undercharged system will result in poor performance (low pressures, etc.) in both the heating and cooling cycle.
59
Overcharged Refrigerant Systems
60
Restricted Refrigerant System
61
Sealed System Method of Charging/ Repairs
62
Compressor Replacement -Special Procedure in Case of Compressor Burnout
64
WIRING DIAGRAMS
66
9-12K 208/230V
66
9-12K 265V
67
18K 208/230V (2.5KW, 3.5KW, 5KW)
68
18K 265V (2.5KW, 3.5KW, 5.0KW)
69
18K 208/230V (7.5KW)
70
18K 265V (7.5KW)
71
24K 208/230V (2.5KW, 3.5KW, 5KW)
72
24K 208/230V (7.5KW AND 10KW)
73
24K 265V (2.5KW, 3.5KW, 5KW)
74
24K 265V (7.5KW and 10KW)
75
INTERACTIVE PARTS VIEWER
76
AVAILABLE ACCESSORIES
77
APPENDIX
78
Appendix 1 Thermistor Resistence Values (This Table Applies to All Thermistors)
78
WARRANTY
79
3
INTRODUCTION
Important Safety Information
The information in this manual is intended for use by a qualified technician
who is familiar with the safety procedures required for installation and
repair, and who is equipped with the proper tools and test instruments
required to service this product. Installation or repairs made by unqualified
persons can result in subjecting the unqualified person making such repairs as
well as the persons being served by the equipment to hazards resulting in
injury or electrical shock which can be serious or even fatal. Safety warnings
have been placed throughout this manual to alert you to potential hazards that
may be encountered. If you install or perform service on equipment, it is your
responsibility to read and obey these warnings to guard against any bodily
injury or property damage which may result to you or others.
Your safety and the safety of others is very
important.
We have provided many important safety messages in this manual and on your
appliance. Always read and obey all safety messages.
This is a safety Alert symbol. This symbol alerts you to potential hazards
that can kill or hurt you and others.
All safety messages will follow the safety alert symbol with the word “WARNING” or “CAUTION”. These words mean:
WARNING
Indicates a hazard which, if not avoided, can result in severe personal injury or death and damage to product or other property.
CAUTION NOTICE
Indicates a hazard which, if not avoided, can result in personal injury and
damage to product or other property.
All safety messages will tell you what the potential hazard is, tell you how
to reduce the chance of injury, and tell you what will happen if the
instructions are not followed.
Indicates property damage can occur if instructions are not followed.
WARNING
Refrigeration system under high pressure Do not puncture, heat, expose to
flame or incinerate.
Only certified refrigeration technicians should service this equipment.
R410A systems operate at higher pressures than R22 equipment. Appropriate safe
service and handling practices must be used.
Only use gauge sets designed for use with R410A. Do not use standard R22 gauge
sets.
4
INTRODUCTION
Personal Injury Or Death Hazards
SAFETY FIRST
WARNING AVERTISSEMENT ADVERTENCIA
Do not remove, disable or bypass this unit’s safety devices. Doing so may cause fire, injuries, or death.
Ne pas supprime, désactiver ou contourner cette l´unité des dispositifs de sécurité, faire vous risqueriez de provoquer le feu, les blessures ou la mort.
No eliminar, desactivar o pasar por alto los dispositivos de seguridad de la unidad. Si lo hace podría producirse fuego, lesiones o muerte.
WARNING
ALWAYS USE INDUSTRY STANDARD PERSONAL PROTECTIVE EQUIPMENT (PPE)
ELECTRICAL HAZARDS:
·
Unplug and/or disconnect all electrical power to the unit before performing inspections, maintenance, or service.
·
Make sure to follow proper lockout/tag out procedures.
·
Always work in the company of a qualified assistant if possible.
·
Capacitors, even when disconnected from the electrical power source, retain an electrical charge potential
capable of causing electric shock or electrocution.
·
Handle, discharge, and test capacitors according to safe, established, standards, and approved procedures.
·
Extreme care, proper judgment, and safety procedures must be exercised if it becomes necessary to test or
troubleshoot equipment with the power on to the unit.
·
Do not spray water on the air conditioning unit while the power is on.
·
Electrical component malfunction caused by water could result in electric shock or other electrically unsafe
conditions when the power is restored and the unit is turned on, even after the exterior is dry.
·
Use air conditioner on a single dedicated circuit within the specified amperage rating.
·
Follow all safety precautions and use proper and adequate protective safety aids such as: gloves, goggles,
clothing, properly insulated tools, and testing equipment etc.
·
Failure to follow proper safety procedures and/or these warnings can result in serious injury or death.
5
INTRODUCTION
Personal Injury Or Death Hazards · REFRIGERATION SYSTEM REPAIR HAZARDS:
·
Use approved standard refrigerant recovering procedures and equipment to relieve high pressure before
opening system for repair. Reference EPA regulations (40 CFR Part 82, Subpart F ) Section 608.
·
Do not allow liquid refrigerant to contact skin. Direct contact with liquid refrigerant can result in minor to
moderate injury.
·
Be extremely careful when using an oxy-acetylene torch. Direct contact with the torch’s flame or hot surfaces
can cause serious burns.
·
Make certain to protect personal and surrounding property with fire proof materials and have a fire extinguisher
at hand while using a torch.
·
Provide adequate ventilation to vent off toxic fumes, and work with a qualified assistant whenever possible.
·
Always use a pressure regulator when using dry nitrogen to test the sealed refrigeration system for leaks,
flushing etc.
· MECHANICAL HAZARDS:
·
Extreme care, proper judgment and all safety procedures must be followed when testing, troubleshooting,
handling, or working around unit with moving and/or rotating parts.
·
Be careful when, handling and working around exposed edges and corners of the sleeve, chassis, and other unit
components especially the sharp fins of the indoor and outdoor coils.
·
Use proper and adequate protective aids such as: gloves, clothing, safety glasses etc.
·
Failure to follow proper safety procedures and/or these warnings can result in serious injury or death.
· PROPERTY DAMAGE HAZARDS
· FIRE DAMAGE HAZARDS:
·
Read the Installation/Operation Manual for the air conditioning unit prior to operating.
·
Use air conditioner on a single dedicated circuit within the specified amperage rating.
·
Be extremely careful when using acetylene torch and protect surrounding property.
·
Failure to follow these instructions can result in fire and minor to serious property damage.
· WATER DAMAGE HAZARDS:
·
Improper installation, maintenance or servicing of the air conditioner unit can result in water damage to personal
items or property.
·
Insure that the unit has a sufficient pitch to the outside to allow water to drain from the unit.
·
Do not drill holes in the bottom of the drain pan or the underside of the unit.
·
Failure to follow these instructions can result in damage to the unit and/or minor to serious property damage.
6
INTRODUCTION
Operation of Equipment in During Construction
· OPERATION OF EQUIPMENT MUST BE AVOIDED DURING CONSTRUCTION PHASES WHICH WILL PRODUCE AIRBORNE DUST OR CONTAMINTES NEAR OR AROUND AIR INTAKE OPENINGS:
·
Wood or metal framing;
·
Drywalling or sheathing,
·
Spackling or applying joint compound.
·
Sanding or grinding.
·
Moulding or trimwork.
·
Concrete dust.
·
Insulation .
·
Spray foam.
·
Stucco spray and mortar.
·
Plastic sheathing.
NOTICE
Operating the equipment during any phase of active construction noted above
can void the equipment’s warranty, and also lead to poor performance and
premature failure.
7
INTRODUCTION
This service manual is designed to be used in conjunction with the
installation and operation manuals provided with each air conditioning system.
This service manual was written to assist the professional service technician
to quickly and accurately diagnose and repair malfunctions. Installation
procedures are not given in this manual. They are given in the Installation
and Operation Manual which can be aquired on the Friedrich website
(www.friedrich.com).
Equipment Identification
Figure 101 (Equipment Identification Example)
Model and Serial Number Location Model and Serial Number information is found
on the Manufacturer’s DATA TAG, located on the front or top.
Figure 102 (Model and Serial Number Location) 8
INTRODUCTION
Model Number Reference Guide
V H A 09 K 34 RT P – A
SERIES V=VERTICAL SERIES
FUNCTION H – HEAT PUMP
DESIGN SERIES A = 32″/47″ CABINET
NOMINAL CAPACITY A SERIES (Btu/h) 09= 9,000 12 = 12,000 18 = 18,000 24 =
24,000
ENGINEERING REVSION LETTER INDICATES AN ENGINEERING MODIFICATION TO AN
EXISTING MODEL
MARKETING SUFFIX LETTER INDICATES MODIFICATION TO AN EXISTING MODEL SERIES
OPTIONS RT = STANDARD REMOTE OPERATION
ELECTRIC HEATER SIZE A SERIES 25 = 2.5 KW 75 = 7.5KW 34 = 3.4 KW 10 = 10KW 50
= 5.0 KW
VOLTAGE K = 208/230V – 1PH-60Hz R = 265V
IMPORTANT: It will be necessary for you to accurately identify the unit you
are servicing, so you can be certain of a proper diagnosis and repair.
Figure 103
9
INTRODUCTION
Serial Number Reference Guide
17 12 M 00001
YEAR OF MANUFACTURE 17 = 2017 18 = 2018 19 = 2019 20 = 2020 21 = 2021 22 =
2022
MONTH OF MANUFACTURE 01 = JANUARY 02 = FEBRUARY 03 = MARCH 04 = APRIL 05 = MAY
06 = JUNE 07 = JULY 08 = AUGUST 09 = SEPTEMBER 10 = OCTOBER 11 = NOVEMBER 12 =
DECEMBER
NUMERIC SEQUENCE FIRST UNIT OF EACH MONTH = 00001
MANUFACTURING LOCATION
Figure 104 10
SPECIFICATIONS
General Specifications -A Models
MODEL
VHA09K VHA09R
COOLING DATA
TOTAL COOLING CAP.
9300
9300
SENSIBLE COOL CAP.
POWER (W)
EER
HEATER SIZE (KW)
7440
845 11.0 2.5/3.4/ 5.0
7440
845 11.0 2.5/3.4/ 5.0
HEAT PUMP DATA
REVERSE HEATING BTU
COP @ 47F
8300 3.3
8300 3.3
HEATING POWER 730
730
(W)
HEATING CURRENT 3.6
3.1
(A)
ELECTRICAL DATA VOLTAGE (1 PHASE, 60 HZ)
VOLT RANGE COOLING CURRENT (A) AMPS L.R
INDOOR MOTOR (HP)
INDOOR MOTOR (A)
208-230
197-253 4.1
21.0 1/4
1.2
265
239-292 3.5
21.0 1/4
1.2
OUTDOOR MOTOR —
—
(HP)
OUTDOOR MOTOR —
—
(A)
PHYSICAL
DIMENSIONS (W X D X H)
23″ X23″ X32″ 23″X 23″X32″
NET WEIGHT (LBS) 142
144
R410A CHARGE
37.0
37.0
(OZ)
AIRFLOW DATA
INDOOR CFM .10″ ESP .15″ ESP .20″ ESP .25″ ESP .30″ ESP .35″ ESP .40″ ESP
LOW 430 410 360 310 260 –
HIGH 490 470 440 400 350 –
LOW 430 410 360 310 260 –
HIGH 490 470 440 400 350 –
VENT CFM
UP TO ” ” CFM
60
60
VHA12K
11500 9085
1045 11.0 2.5/3.4/ 5.0
10600 3.3 940 4.5
208-230
197-253 4.9
23.0 1/4
1.2 —
—
23″X 23″X32″
147 42.1
LOW 430 410 360 310 260 –
HIGH 490 470 440 400 350 –
60
VHA12R
11500 9085
1045 11.0 2.5/3.4/ 5.0
10600 3.3 940 3.7
265
239-292 4.0
23.0 1/4
1.2 —
—
23″X 23″X32″
149 42.1
LOW 430 410 360 310 260 –
HIGH 490 470 440 400 350 –
60
VHA18K
18400 13430 1670 11.0 2.5/3.4/ 5.0/7.5
16700 3.3 1480 7.0
208-230
197-253 7.9
37.0 1/4
0.42 1/4
1.6
23″X 23″X47″
190 57
LOW 630 595 550 505 455 400 345
HIGH 675 640 600 550 500 445 400
60
VHA18R
18400 13430 1670 11.0 2.5/3.4/ 5.0/7.5
16700 3.3 1480 6.1
265
239-292 7.0
37.0 1/4
0.42 1/4
1.6
23″X 23″X47″
192 57
LOW 630 595 550 505 455 400 345
HIGH 675 640 600 550 500 445 400
60
VHA24K
22500 15750 2045 11.0 2.5/3.4/ 5.0/7.5/ 10.0
19500 3.3 1732 9.2
208-230
197-253 10.5
44.0 1/5
1.4 1/4
1.7
23″X 23″X52″
225 62
LOW 660 615 575 525 485 450 415
HIGH 700 665 625 580 540 500 465
60
VHA24R
22500 15750 2045 11.0 2.5/3.4/ 5.0/7.5/ 10.0
19500 3.3 1732 9.2
265
239-292 10.5
44.0 1/5
1.4 1/4
1.7
23″X 23″X52″
227 62
LOW 660 615 575 525 485 450 415
HIGH 700 665 625 580 540 500 465
60
Figure 201a (General Specs – A Models)
11
SPECIFICATIONS
General Specifications -B Models
MODEL
COOLING DATA
TOTAL COOLING CAP.
SENSIBLE COOL CAP.
POWER (W)
EER
HEATER SIZE (KW)
HEAT PUMP DATA
REVERSE HEATING BTU
COP @ 47F
HEATING POWER (W)
HEATING CURRENT (A)
ELECTRICAL DATA VOLTAGE (1 PHASE, 60 HZ)
VOLT RANGE COOLING CURRENT (A) AMPS L.R
INDOOR MOTOR (HP)
INDOOR MOTOR (A)
OUTDOOR MOTOR (HP)
OUTDOOR MOTOR (A)
PHYSICAL
NET WEIGHT (LBS)
R410A CHARGE (OZ)
AIRFLOW DATA
INDOOR CFM .10″ ESP .15″ ESP .20″ ESP .25″ ESP .30″ ESP .35″ ESP .40″ ESP
VENT CFM UP TO ” ” CFM
VHA09K
9300 7440 845 11.0 2.5/3.4/5.0
8300 3.3 730 3.6
208-230
197-253 4.1
21.0 1/4
1.2 —
—
142 38.0
LOW 430 410 360 310 260 –
HIGH 490 470 440 400 350 –
60
VHA09R
9300 7440 845 11.0 2.5/3.4/5.0
8300 3.3 730 3.1
265
239-292 3.5
21.0 1/4
1.2 —
—
144 38.0
LOW 430 410 360 310 260 –
HIGH 490 470 440 400 350 –
60
VHA12K
11500 9085 1045 11.0 2.5/3.4/5.0
10600 3.3 940 4.5
208-230
197-253 4.9
23.0 1/4
1.2 —
—
147 42.1
LOW 430 410 360 310 260 –
HIGH 490 470 440 400 350 –
60
VHA12R
11500 9085 1045 11.0 2.5/3.4/5.0
10600 3.3 940 3.7
265
239-292 4.0
23.0 1/4
1.2 —
—
149 42.1
LOW 430 410 360 310 260 –
HIGH 490 470 440 400 350 –
60
VHA18K
18400 13430 1670 11.0 2.5/3.4/5.0/7.5
16700 3.3 1480 7.0
208-230
197-253 7.9
37.0 1/4
0.42 1/4
1.6
190 58.5
LOW 630 595 550 505 455 400 345
HIGH 675 640 600 550 500 445 400
60
VHA18R
18400 13430 1670 11.0 2.5/3.4/5.0/7.5
16700 3.3 1480 6.1
265
239-292 7.0
37.0 1/4
0.42 1/4
1.6
192 58.5
LOW 630 595 550 505 455 400 345
HIGH 675 640 600 550 500 445 400
60
Figure 201b (General Specs – B Models) 12
SPECIFICATIONS
Chassis Specifications 9K, 12K
Front
23 1/8″
10″
D UC T DIAMETER
2 15/16″
29 1/2″
RETURN AIR
1 1/2″
Side
23 1/8″
SUPPLY AIR
CONDEN SE R INLET AIR
CONDENSER
EXHAUST AIR
29 1/2″
Rear
10 1/8″ 31″
19 1/2″
UNIT TOP VIEW DIMENSIONS
O utside Wall
Figure 202 (9-12K Chassis Specs) 13
18K Dimensions
SPECIFICATIONS
FRONT
2 1/2
CONDENSER INLET AIR
42 5/8 47 15/16
CONDENSER EXHAUST AIR
10 DUCT DIAMETER
ELECTRICAL ENTRY BOTH SIDES
RETURN AIR
39 3/4
1 1/2
SIDE
UNIT TOP VIEW DIMENSIONS
control box
22 5/16″
electrical
6 3/16″
8 3/8″
entrance
SUPPLY AIR
5 1/16
2 3/16 11 11/16
31 REAR
5 5/16″
7 3/16″
4 3/16″
Figure 203 (18K Chassis Specs) 14
24K Dimensions
SPECIFICATIONS
FRONT
SUPPLY AIR
6 55/64 DUCT
1 DUCT
2 1/2
46 23/32 51 7/8
CONDENSER INLET AIR
CONDENSER EXHAUST AIR
1 1/2
SIDE
ELECTRICAL ENTRY BOTH SIDES
RETURN AIR
44
UNIT TOP VIEW DIMENSIONS
20 5/8 DUCT
REAR
5 5/32 15 7/16
31 9/32
12 19/64
1 1/2
Outside Wall
20 5/8
1 1/2 6 55/64 3 55/64
Figure 204 24K Chassis Specs) 15
SPECIFICATIONS
Electrical Data (208/ 230v 9K btu and 12K BTU)
MODEL
9K
HEATER WATTS
2050-2500
VOLTAGE
ELECTRIC HEATING BTU 7000-8500
ELEC. HEATING CURRENT (AMPS)
11.1-12.0
MINIMUM CIRCUIT
15
AMPACITY
BRANCH CIRCUIT FUSE 15 (AMPS)
LRA – COMPRESSOR
21.0
(AMPS)
BASIC HEATER SIZE
2.5 KW
POWER CONNECTION
RECOMMENDED
14
BRANCH CIRCUIT WIRE
SIZES* AWG-AMERI-
CAN WIRE GAUGE
2780-3400
9500-11600 14.6-16.0
12K
4090-5000 2050-2500
208-230
13900-17000 7000-8500
20.9-22.9
11.1-12.0
20.0
29.2
15
20
30
15
21.0
21.0
23.0
3.4 KW 12
5.0 KW
2.5 KW
HARD WIRED
10
12
2780-3400
9500-11600 14.6-16.0 20.0 20 23.0 3.4 KW
12
Figure 205a (9&12K 208/230V Electrical Data) -A Models
4090-5000
13900-17000 20.9-22.9 29.2 30 23.0 5.0 KW
10
MODEL
9K
HEATER WATTS
2050-2500
VOLTAGE
ELECTRIC HEATING BTU 7000-8500
ELEC. HEATING CURRENT (AMPS)
11.5-12.5
MINIMUM CIRCUIT
16
AMPACITY
BRANCH CIRCUIT FUSE 20 (AMPS)
LRA – COMPRESSOR
21.0
(AMPS)
BASIC HEATER SIZE
2.5 KW
POWER CONNECTION
RECOMMENDED
12
BRANCH CIRCUIT WIRE
SIZES* AWG-AMERI-
CAN WIRE GAUGE
2780-3400
9500-11600 15.0-16.4
12K
4090-5000 2050-2500
208-230
13900-17000 7000-8500
21.3-23.3
11.5-12.5
20.9
29.6
16
25
30
20
21.0
21.0
23.0
3.4 KW 12
5.0 KW
2.5 KW
HARD WIRED
10
12
2780-3400 4090-5000
9500-11600 15.0-16.4
13900-17000 21.3-23.3
20.9
29.6
25
30
23.0
23.0
3.4 KW
5.0 KW
12
10
Figure 205a (9&12K 208/230V Electrical Data) -B Models
16
SPECIFICATIONS
Electrical Data (265v 9K and 12K BTU)
MODEL
9R
12R
HEATER WATTS
2500
3400
5000
2500
3400
VOLTAGE ELECTRIC HEATING BTU 8500
11600
17000
265 8500
11600
ELEC. HEATING CUR- 10.5
13.9
19.9
10.5
13.9
RENT (AMPS)
MINIMUM CIRCUIT
13.8
18.0
25.7
13.8
18.0
AMPACITY
BRANCH CIRCUIT FUSE 15
20
30
15
20
(AMPS)
LRA – COMPRESSOR (AMPS)
BASIC HEATER SIZE
21.0 2.5 KW
21.0 3.4 KW
21.0 5.0 KW
23.0 2.5 KW
23.0 3.4 KW
POWER CONNECTION
HARD WIRED
RECOMMENDED
14
12
10
12
12
BRANCH CIRCUIT WIRE
SIZES* AWG-AMERI-
CAN WIRE GAUGE
Figure 206a (9K BTU&12K BTU 265 Electrical Data) -A Models
5000
7000 19.9 25.7 30 23.0 5.0 KW
10
MODEL
9R
HEATER WATTS
2500
VOLTAGE
ELECTRIC HEATING BTU 8500
ELEC. HEATING CUR- 11.0 RENT (AMPS)
MINIMUM CIRCUIT
14.2
AMPACITY
BRANCH CIRCUIT FUSE 15 (AMPS)
LRA – COMPRESSOR
21.0
(AMPS)
BASIC HEATER SIZE
2.5KW
POWER CONNECTION
RECOMMENDED
14
BRANCH CIRCUIT WIRE
SIZES* AWG-AMERI-
CAN WIRE GAUGE
3400
11600 14.4 18.5 20 21.0 3.4KW
12
5000
17000 20.5
12R 2500 265 8500 11.0
26.0
14.2
30
15
21.0
23.0
5.0KW
2.5KW
HARD WIRED
10
12
3400
11600 14.4 18.5 20 23.0 3.4KW
12
Figure 206b (9K BTU&12KBTU 265 Electrical Data) -B Models 17
5000
17000 20.5 26.0 30 23.0 5.0KW
10
SPECIFICATIONS
Electrical Data (208/ 230v 18K BTU and 24K BTU)
MODEL HEATER WATTS
VOLTAGE ELECTIC HEATING BTU
ELEC. HEATING CURRENT (AMPS) MINIMUM CIRCUIT AMPACITY BRANCH CIRCUIT FUSE
(AMPS) LRA – COMPRESSOR (AMPS) BASIC HEATER SIZE POWER CONNECTION RECOMMENDED
BRANCH CIRCUIT WIRE SIZES* AWG-AMERICAN WIRE GAUGE
18K 2050-2500
2780-3400
4090-5000
24K 2050-2500
2780-3400
4090-5000
6135-7500
7000-8500 9500-11600 11.1-12.0 14.6-16.0
1390017000
20.9-22.9
208-230
7000-8500 9500-11600 1390017000
11.3-12.3 14.8-16.2 21.1-23.1
2090025600
30.9-34.0
15.0
20.0
29.2
15.4
20.3
29.0
42.6
15
20
30
20
25
30
45
37.0
37.0
37.0
44.0
44.0
44.0
44.0
2.5KW 14
3.4KW 12
5.0KW
2.5KW
HARD WIRED
10
12
3.4KW 10
5.0KW 10
7.5KW 6
Figure 207a (18K BTU &24K BTU 208/230V Electrical Data)-A Models
818010000
2790034100 40.7-44.9 56.1 60 44.0 10.0KW
4
MODEL
18K
HEATER WATTS
2050-2500 2780-3400 4090-5000
VOLTAGE
208-230
ELECTIC HEATING BTU 7000-8500 9500-11600 1390017000
ELEC. HEATING CURRENT (AMPS)
11.5-12.5
15.0-16.4
21.3-23.3
MINIMUM CIRCUIT
15.6
20.5
29.2
AMPACITY
BRANCH CIRCUIT FUSE 20
25
30
(AMPS)
LRA – COMPRESSOR
37.0
37.0
37.0
(AMPS)
BASIC HEATER SIZE
2.5KW
3.4KW
5.0KW
POWER CONNECTION
HARD WIRED
RECOMMENDED
12
12
10
BRANCH CIRCUIT WIRE
SIZES* AWG-AMERI-
CAN WIRE GAUGE
6135-7500
2090025600 31.1-34.2 42.8 45 37.0 7.5KW
6
Figure 207b (18K BTU 208/230V Electrical Data)-B Models 18
SPECIFICATIONS
Electrical Data (265v 18K BTU and 24K BTU)
MODEL
18R
HEATER WATTS
2500
VOLTAGE
ELECTIC HEATING BTU 8500
ELEC. HEATING CURRENT (AMPS)
10.5
MINIMUM CIRCUIT AMPACITY
13.8
BRANCH CIRCUIT FUSE 15 (AMPS)
LRA – COMPRESSOR (AMPS)
37.0
BASIC HEATER SIZE
2.5KW
POWER CONNECTION
RECOMMENDED
14
BRANCH CIRCUIT WIRE
SIZES* AWG-AMERI-
CAN WIRE GAUGE
3400
11600 13.9 18.0 20 37.0 3.4KW
12
5000
17000 19.9
24R 2500
8500 10.8
3400 265
11600 14.2
25.7
13.6
17.8
30
20
20
37.0
44.0
44.0
5.0KW
2.5KW
HARD WIRED
10
12
3.4KW 12
5000
17000 20.3 25.4 30 44.0 5.0KW
10
Figure 208a (18K BTU &24K BTU 265V Electrical Data)-A Models
7500
25600 29.7 37.2 40 44.0 7.5KW
6
10000
34100 39.1 49.0 50 44.0 10.0KW
4
MODEL
18R
HEATER WATTS
2500
VOLTAGE
ELECTIC HEATING BTU 8500
ELEC. HEATING CURRENT (AMPS)
11.0
MINIMUM CIRCUIT AMPACITY
13.8
BRANCH CIRCUIT FUSE 15 (AMPS)
LRA – COMPRESSOR (AMPS)
37.0
BASIC HEATER SIZE
2.5KW
POWER CONNECTION
RECOMMENDED
14
BRANCH CIRCUIT WIRE
SIZES* AWG-AMERI-
CAN WIRE GAUGE
3400 265
11600 14.4
5000
17000 20.5
18.1
25.6
20
30
37.0
37.0
3.4KW
5.0KW
HARD WIRED
12
10
7500
25600 29.9 37.4 40 37.0 7.5KW
6
Figure 208b (18K BTU &24K BTU 265V Electrical Data)-B Models 19
Electrical Requirements
SPECIFICATIONS
ELECTRICAL REQUIREMENTS
WIRE SIZE
Use ONLY wiring size recommended by the National Electric Code (NEC) for single outlet branch circuit.
FUSE/CIRCUIT BREAK- USE ONLY TYPE AND SIZE FUSE OR HACR CIRCUIT BREAKER INDICATED ON UNIT’S
ER
RATING GUIDE. PROPER OVER CURRENT PROTECTION TO THE UNITS IS THE RESPON-
SIBILITY OF THE OWNER.
GROUNDING
UNIT MUST BE GROUNDED FROM BRANCH CIRCUIT TO UNIT, OR THROUGH SEPARATE GROUND WIRE PROVIDED ON PERMANENTLY CONNECTED UNITS. ENSURE THAT BRANCH CIRCUIT OR GENERAL PUR- POSE OUTLET IS GROUNDED.
WIRE SIZING
USE RECOMMENDED WIRE SIZE GIVEN IN TABLES AND INSTALL A SINGLE BRANCH CIRCUIT. ALL WIRING MUST COMPLY WITH LOCAL AND NATIONAL CODES. NOTE: USE COPPER CONDUCTORS ONLY.
Electrical Ratings Table
Recommended Branch Circuit Sizes*
Nameplate Maximum Circuit Breaker Size
AWG Wiring Size**
15A
14
20A
12
30A
10
45A
6
60A
4
NOTE: Use copper conductors ONLY. Wire sizes are per NEC. AWG – American Wire Gauge * Single circuit from main box. ** Based on 100′ or less of copper, single insulated conductor at 60° C
WARNING
Electrical Shock Hazard.
Turn OFF electric power before service or installation. Unit must be properly
grounded. Unit must have correct fuse or circuit breaker protection. Unit’s
supply circuit must have the correct wire conductor size. All electrical
connections and
and conform to the National Electrical Code and all local codes which have
jurisdiction. Failure to do so can result in property damage, personal injury
and/or death.
NOTE: ALL 230/208 CHASSIS MUST BE HARD WIRED WITH A PROPERLY SIZED BREAKER. SEE UNIT NAMEPLATE FOR SPECIFIC ELECTRICAL REQUIREMENTS. USE HACR TYPE BREAKERS TO AVOID NUISANCE TRIPS. ALL FIELD WIRING MUST BE DONE IN ACCORDANCE WITH NEC AND LOCAL CODES. IT IS THE INSTALLER’S RESPONSIBILITY TO ENSURE THAT THE ELECTRICAL CODES ARE MET.
20
Sound Data
MODEL
VHA09 VHA12 VHA18 VHA24
SPECIFICATIONS
Sound Power and STC
INDOOR (DBA)
OUTDOOR (DBA)
STC
HIGH COOL
LOW COOL
HIGH COOL
LOW COOL
23
63.6
61.4
75.4
72.9
23
63.0
60.8
75.3
72.7
24
67.2
65.7
74.9
74.8
25
67.8
66.4
78.5
72.7
Figure 209 (Sound Data)
21
Supply Air Flow and Data
FAN SPEED ESP (“) 0.0″ 0.05″ 0.10″ 0.15″ 0.20″ 0.25″ 0.30″ 0.35″ 0.40″
MODEL VHA 09/12 LOW CFM 470 460 430 410 360 310 260 —
SPECIFICATIONS
HIGH
520 510 490 470 440 400 350 —
VHA 18 LOW
730 670 630 595 550 505 455 400 345
HIGH
800 735 675 640 600 550 500 445 400
VHA 24 LOW
755 700 660 615 575 525 485 450 415
HIGH
805 750 700 665 625 580 540 500 465
Figure 210 (Indoor CFM & External Static Pressure) Indoor air flow may be
determined by measuring the external static pressure (ESP) of the duct system
using an inclined manometer or magnahelic gauge and consulting the above chart
to derive actual air flow. Under no circumstances should the large chassis
Vert-I-Pak equipment be operated at an external static pressure in excess of
0.4” W.C. Operation of the Vert-I-Pak under these conditions will result in
inadequate air flow, leading to poor performance and/or premature component
failure.
Control For LOW speed only operation, connect the fan output terminal from the
thermostat to the GL terminal of the electronic control. For HIGH speed only
operation, connect the fan output terminal from the thermostat to the GH
terminal of the electronic control. For thermostats with two-speed capability,
connect the LOW speed output to the GL terminal and the HIGH speed output to
the GH terminal.
Condenser CFM & External Static Pressure VPAK is designed to install through
an exterior wall with a plenum (VPAWP-8, VPAWP-14) and a Friedrich external
louver . NOTE: If the Friedrich designed plenum and louver combinations are
not used, the selections and design must be evaluated by Friedrich to ensure
the total pressure drop does not exceed the maximum allowable limits.
Condenser External Static Pressure
Model
Design
CFM
ESP (“WC)
VHA09
650
0.03
VHA12
650
0.03
VHA18
950
0.03
VHA24
980
0.03
Maximum ESP (“WC) 0.12 0.12 0.12 0.12
Figure 211 (Condenser CFM & External Static Pressure) 22
SPECIFICATIONS
Required Minimum Clearances
Building Exterior Unit Opening Requirements
be installed no closer than 12″ apart when two units are side by side. If
three or more units are to operate next to one with adjacent, outset units, a
minimum distance of 64” must be kept between units (Figure C). Also, a
vertical clearance of above “FINISHED GRADE ELEVATION”. No exceptions.
6″
60″ 60″ 60″
6″
Figure A
60″ 60″
60″ 60″
6″
Figure B
32 ” 160 ”
64″
Figure C
60″ 60″
60″ 60″
12″
Figure D
Grill Clearance Requirements
Where obstructions are present use the following guidelines for proper spacing
from the VPAK exterior louvered grill. Friedrich recommends that ALL
obstructions are a minimum of 72″ from the exhaust.
For minor obstruction(s) such as lamp poles or small shrubbery, a clearance of
24″ from the outdoor louver must be maintained.
For major obstructions such as a solid fence, wall, railing, or other heat
rejecting devices like a condensing unit, a minimum distance of 72″ must be
kept.
VPAK
OUTDOOR CONDENSING UNIT
BUILDING
24″
VPAK
VPAK
POLE
SHRUB
MAJOR OBSTRUCTIONS
FENCE
The the example pictured above is for reference only and does not represent all possible installations. Please contact Friedrich Air Conditioning for information regarding effects of other installation arrangements.
Figure 212 23
OPERATION
Electronic Control Board Features
The Friedrich Vert-I-Pak has state of the art features to improve guest
comfort and conserve energy. Below is a list of standard features on every
Friedrich VPAK and their benefitt to the owner.
Quite Start/ Stop Fan Delay
Remote Thermostat Operation Internal Diagnostic Program
Service Error Code Storage
Random Compressor Restart
Heat Pump Units Digital Defrost Thermostat
Instant Heat Heat Pump Mode Room Air Sampling Feature
Desk Control Ready
The fan start and stop delays prevent abrupt changes in room acoustics due to
the compressor energizing or stopping immediately. Upon call for cooling or
heating the unit fan will run for five seconds prior to en-ergizing the
compressor. Also, the fan off delay allows for “free cooling” by utilizing the
already cool indoor coil to its maximum capacity by running for 30 seconds
after the compressor.
VPAK units can be configured to be set up with a wired thermostat, wireless
thermostat, or an ernegy management thermostat.
The VPAK features a self diagnostic program that can alert maintenance to
compo-nent failures or operating problems. The internal diagnostic program
saves properties valuable time when diagnosing running problems.
The self diagnosis program will also store error codes in memory if certain
conditions occur and correct themselves such as extreme high or low operating
conditions or activation of the room freeze protection feature. Storing error
codes can help properties determine if the unit faced obscure conditions or if
an error occurred and corrected itself.
Multiple compressors starting at once can often cause electrical overloads and
premature unit failure. The random restart delay eliminates multiple units
from starting at once following a power outage or initial power up. The
compressor delay will range from 180 to 240 seconds.
The VPAK uses a digital thermister to accurately monitor the outdoor coil
conditions to allow the heat pump to run whenever conditions are correct.
Running the VPAK in heat pump mode save energy and reduces operating costs.
The digital thermostat allows maximization of heat pump run time.
Heat pump models will automatically run the electric heater during compressor
lock-out to quickly provide heat when initially energized, then return to heat
pump mode. This ensures that the room is heated quickly without the usual
delay associated with heat pump units.
The room air sampling feature maintains a balanced temperature throughout the
room by circulating the air for 90 seconds once every 9 minutes that the unit
is not running when it is set to cooling or heating mode. By circulating the
air, the unit can detect hot or cold areas in the room and operate the unit to
cool or warm the room as necessary. This function is only available when the
fan mode is set to `AUTO’ during COOL or HEAT Mode.
All electronic VPAK units have low voltage terminals ready to connect a desk
control energy management system. Controlling the unit’s on/off operation from
a remote location like the front desk can reduce energy usage and requires no
additional accessories at the VPAK.
Indoor Coil Frost Sensor Auxiliary Fan Ready
The frost sensor protects the compressor from damage in the event that airflow
is reduced or low outdoor temperatures cause the indoor coil to freeze. When
the indoor coil reaches 30°F the compressor is diabled and the fan continues
to operate based on demand. Once the coil temperature returns to 45°F the
compressor returns to operation.
The VPAK features a 24V AC terminal for connection to a relay that may be used
to operate an auxiliary fan to transfer air to adjoining rooms. Auxiliary fans
can provide air conditioning to odd shaped rooms.
24
Operation
Electronic Sequence of Operation
Compressor and Reversing Valve Control
Active Mode Cooling Heat – Pump Heat – Electric Fan Only
Compressor On On Off Off
Reversing Valve De-Energized Energized
Reversing Valve The reversing valve stays in the last state until a call for heat or cooling. The reversing valve only changes when required to provide coooling or heat pump. Leave the reversing valve in it’s last state
until it’s required to change.
Unit Cooling Mode
Once the ambient temperature rises past the cool demand set point of the
t-stat (see figure below), and the compressor is not locked out, the cooling
cycle begins. As shown in the figure below, the fan is started 5 seconds prior
to the compressor. Once the ambient temperature has been lowered to the cool
set point, the cooling cycle
starts to terminate by shutting off the compressor. After a 30 seconds delay, the fan is shut off.
Heating Mode Control Operation
There are two heating methods: Heat Pump and Electric Resistance Heat. There
are 2 Types of units that provide heating: Cool / Heat Pump with Electric Heat
and Cool with Electric heat.
Heat Mode in Cool with Electric Heat Units When the t-stat is in the Heat Mode, if the indoor ambient temperature is below the heat set point, the fan turns on 5 seconds prior then the electric heat will turn on. When the t-stat is satisfied, the electric heat will turn off. The fan turns off 15 seconds later.
Heat Pump With Electric Heat Operation This heating has two heating methods. If the ambient indoor temperature is below the heat set point and the compressor is not locked out, the compressor turns on. If the ambient temperature rises above the t-stat’s heat set point, the compressor turns off.
If the Compressor is Locked Out on the 3 Minute Time Delay and Electric Heat is Available
The control turns on the electric heat until the compressor is not locked out.
After lockout, the control turns off the electric heat, waits 5 seconds, then turns on the compressor.(The wired
remote wall t-stat’s time delay may override this feature).
Condition 1 If the outdoor coil temperature sensor drops to 30 degrees F for less than 2 consecutive minutes, the unit will switch to electric heat if available. Thereafter, the unit will switch back to Heat Pump heat until the outdoor coil temperature sensor rises to 45 degrees F or greater.
25
OPERATION
Compressor Lock Out Time
The lockout feature ensures that the compressor is de-energized for a period of time. The timer varies randomly
from 180 to 240 seconds.
The compressor lockout is initiated every time the compressor is “off” due to:
(1)
Satisfying the T-stat temperature set point
(2)
Changing mode to fan only or heat
(3)
Turning the unit off
(4)
Power is restored after failure
(5)
Line power is restored from a brown out condition
Cooling Fan Delay
This is only for t-stat Fan Auto Mode only. When unit cycles cooling ON
starts the fan 5 seconds EARLY. When unit cycles cooling OFF DELAYS the fan
off for 30 seconds
Heating Fan Delay
This is only for Fan Auto Mode (Fan cycles with cool/heat operation) and not
for continuous fan mode. When unit cycles Heating ON starts the fan 5
seconds EARLY. When unit cycles Heating OFF DELAYS the fan off for 15
seconds. Continuous fan operation enables fan to run continuously.
Fan Speed Change Delay
Relay activation is delayed by a minimum number of seconds. The default for
this value is 2 seconds and is used to eliminate relay chatter.
Room Air Sampling Feature
The room air sampling feature maintains a balanced temperature throughout the
room by circulating the air for 90 seconds once every 9 minutes that the unit
is not running when it is set to cooling or heating mode. By circulating the
air, the unit can detect hot or cold areas in the room and operate the unit to
cool or warm the room as neces-sary. This function is only available when the
fan mode is set to `AUTO’ during COOL or HEAT Mode.
Low Voltage Interface Connections
All Vert-I-Pak units have a low voltage interface connector through which a
Remote Wall Thermostat, Desk Control and Auxiliary Fan’s Relay can be
connected. The interface connector is located on the electronic control board.
FP
F2
F1 D2 D1 C GH GL B Y W R
26
Interface Connector Definitions Factory use only. (Ensure there is no jumper
at FP an F2) Used with F1 to provide 24 VAC to external fan relay. (Ensure
there is no jumper at FP an F2 Used with F2 to provide 24 VAC to external fan
relay. Used with D1 for desk control on or off operation. Used with D2 for
desk control on or off operation.
Common Ground TerminaL Call for high fan Call for low fan Call for heat pump
reversing valve Call for compressor Call for heating 24V Power from Electronic
Control to Wall
Figure 301 (Inteface Connections)
Figure 302 (Inteface Connections)
OPERATION
Remote Wall Thermostat All Friedrich Vert-I-Pak units are factory configured
to be controlled by using a single stage heat/cool remote wired wall mounted
thermostat.
Thermostat Selection SINGLE STAGE THERMOSTATS RT7P Wired, single stage, wall-
mounted programmable thermostat with two fan speeds and backlight. Controls
Friedrich VERT-I-PAK. RT7 Wired, single stage, wall-mounted digital thermostat
with two fan speeds and backlight. Controls Friedrich VERT-I-PAK. WRT2
Wireless, single stage, wall-mounted programmable thermostat with two fan
speeds and backlight. Controls Friedrich VERT-I-PAK. ENERGY MANAGEMENT
THERMOSTATS EMRT2/EMWRT2 Wired/Wirelss thermostat with occupancy sensor
Thermostat terminals requirements: C, R, G, Y, W, B. For two fan speeds,
thermostat must have 2 fan speed selection.
During Heat Mode: The B terminal must be continuously energized. The W
terminal must have 24 VAC output to call for heat. The control board decides
on whether to turn on the Heat Pump Heat (compressor) or Electric Heat. The Y
terminal should not have 24 VAC output during heat mode.
Connecting a Remote Wall Thermostat
CONNECT THERMOSTAT USING FIGURES 301, 302, and 303. Refer to thermosts Manuals
for installation. Current thermostat manuals may be obtained online at
www.friedrich.com.
WARNING
ELECTRIC SHOCK HAZARD Disconnect power to the unit before servicing. Failure
to follow this warning could result in serious injury or death.
- Ensure jumper Is not Installed At FP And F2 2) Disconnect power to the
unit. 3) Unscrew and remove the electrical control box’s cover. 4) Locate the
Interface Connector (24 VAC terminal strip (See figure 1 at left). 5) Make the
wire connections according to the con figuration needed for your unit Use #18
gauge wire size. 6) Once each wire is matched and connected, the unit is now
ready to be controlled by the thermostat. 7) Reattach the electrical control
box’s cover.
27
OPERATION
Remote Wall Thermostat Location The thermostat should not be mounted where it
may be affected by drafts, discharge air from registers (hot or cold), or heat
radiated from the sun appliances, windows etc.. The thermostat should be
located about 5 Ft. above the floor in an area of average temperature, with
good air circulation. Thermostats should be level for aesthetics. Note: An
improperly operating or poorly located remote wall thermostat can be the
source of perceived equipment problems. A careful check of the thermostat’s
location and wiring must be made to ensure that it is not the source of
problems.
Figure 303 (Thermostat Locations)
Desk Control The unit’s electronic control has built-in provisions for connection to an external switch to control power to the unit. The switch can be a central desk control
Maximum wire Length for Desk Control Switch
system or even a normally open door switch.
Wire Size
Maximum Length
24
For desk control operation, connect one side of the switch to the D1 terminal and the other to the D2 terminal (See page 12). Whenever the switch closes, the unit operation
22
will stop.
20
18
400 ft. 600 ft. 900 ft. 1500 ft.
16
2000 ft.
Auxiliary Fan Control The electronic control also has the ability to control a 24 VAC relay to activate an auxiliary, or transfer fan. The outputs are listed as F1 and F2 on the interface connector (See page 12). To connect the relay, simply wire one side of the relay to F1 and the other side to F2. Anytime that the fan runs, the terminals will send a 24 VAC signal to the relay. The relay must be 24 VAC, 50mA or less. Note: The Desk Control, Auxiliary Fan relay and wires must be field supplied.
28
OPERATION
Unit Heat Control Operation – Heat Pump With Electric Heat
Automatic Emergency Heat If the sealed system fails with a bad reversing valve
or anything that causes the indoor coil to get colder than the indoor ambient
temperature: 1) If the indoor coil thermistor senses a 5 degree temperature
drop as compared to the ambient temperature thermistor and this lasts up to 5
minutes, the control board will switch the unit to electric heat and continue
heating with it. 2) At this point, error code 15 is generated; heat pump
failure. Indoor coil temperature lower than indoor ambient temperature for 5
or more degrees for 5 consecutive minutes. Note: It is Ok to continue to use
the unit with the electric heater until the heat pump is repaired.
Heat Control Operation – Electric Heat Only
When in the Heat mode, with and without Fan Mode Auto (Fan cycling): If the
indoor ambient temperature is below the Heat Demand Threshold (Heat Set Point
minus 1.5 °F), turn on electric heat. If Ambient is 0.3 °F above the Heat Set
Point turn off the electric heat.
System Mode Auto
This mode provides automatic change over between cool and heat. The auto mode
runs based on the room ambient temperature vs. the Demand Thresholds. It is
only available in Heat-Cool Unit. Notes: There is a buffer zone between the
cool and heat set points where no heating or cooling is allowed to occur. It
is critical that the Cool Demand Threshold be greater than the Heat Demand
Threshold by a minimum of 3° while in the Auto System Mode. For example, if a
user enters a value for the Auto Cooling Set Point that violates the minimum
delta 3° rule, the Auto Heating Set Point will adjust accordingly. Automatic
Change Over Delay (Cool with Heat Units) The change over delay ensures that
any system heating or cooling over shoot does not trigger an opposite demand
cycle. The change over delay = 15 min. This timer blocks the opposite demand
cycle from running until the timer expires. As an example, if the last demand
was a cool cycle, and another cool cycle is requested, the timer will not
block the request. However, if the last demand cycle was a cool cycle, and
heat cycle is requested, the timer will block the request until the change
over delay is expired.
Compressor Lock Out Time
The lockout feature ensures that the compressor is de-energized for a period
of time. The timer varies randomly from 180 to 240 seconds The compressor
lockout is initiated every time the compressor is “off” due to: (1) Satisfying
the temperature set point (2) Changing mode to fan only or heat (3) Turning
the unit off (4) Control is first plugged in or power is restored after
failure (5) Line power is restored from a brown out condition
Cooling Fan Delay
Fan cycle/Auto mode only When unit cycles cooling ON starts the fan 5
seconds EARLY. When unit cycles cooling OFF DELAYS the fan off for 30
seconds.
29
OPERATION
General Knowledge Sequence Of Refrigeration
A good understanding of the basic operation of the refrigeration system is
essential for the service technician. Without this understanding, accurate
troubleshooting of refrigeration system problems will be more difficult and
time consuming, if not (in some cases) entirely impossible. The refrigeration
system uses four basic principles in its operation which are as follows:
1. “Heat always flows from a warmer body to a cooler body.”
2. “Heat must be added to or removed from a substance before a change in state can occur”
3. “Flow is always from a higher pressure area to a lower pressure area.”
4. “The temperature at which a liquid or gas changes state is dependent upon the pressure.” The refrigeration cycle begins at the compressor when a demand is received from the thermostat. Starting the compressor creates a low pressure in the suction line which draws refrigerant gas (vapor) into the compressor. The compressor then “compresses” this refrigerant vapor, raising its pressure and its (heat intensity) temperature. The refrigerant leaves the compressor through the discharge line as a hot high pressure gas (vapor). The refrigerant enters the condenser coil where it gives up some of its heat. The condenser fan moving air across the coil’s finned surface facilitates the transfer of heat from the refrigerant to the relatively cooler outdoor air.
When a sufficient quantity of heat has been removed from the refrigerant gas (vapor), the refrigerant will “condense” (i.e. change to a liquid). Once the refrigerant has been condensed (changed) to a liquid it is cooled even further by the air that continues to flow across the condenser coil.
The design determines at exactly what point (in the condenser) the change of state (i.e. gas to a liquid) takes place. In all cases, however, the refrigerant must be totally condensed (changed) to a liquid before leaving the condenser coil.
The refrigerant leaves the condenser coil through the liquid line as a warm high pressure liquid. It next will pass through the refrigerant drier (if equipped). It is the function of the drier to trap any moisture present in the system, contaminants, and large particulate matter.
The liquid refrigerant next enters the metering device. The metering device is called a capillary tube. The purpose of the metering device is to “meter” (i.e. control or measure) the quantity of refrigerant entering the evaporator coil. In the case of the capillary tube this is accomplished (by design) through size (and length) of device, and the pressure difference present across the device. Since the evaporator coil is under a lower pressure (due to the suction created by the compressor) than the liquid line, the liquid refrigerant leaves the metering device entering the evaporator coil. As it enters the evaporator coil, the larger area and lower pressure allows the refrigerant to expand and lower its temperature (heat intensity). This expansion is often referred to as “boiling” or atomizing. Since the unit’s blower is moving indoor air across the finned surface of the evaporator coil, the expanding refrigerant absorbs some of that heat. This results in a lowering of the indoor air temperature, or cooling.
The expansion and absorbing of heat cause the liquid refrigerant to evaporate (i.e. change to a gas). Once the refrigerant has been evaporated (changed to a gas), it is heated even further by the air that continues to flow across the evaporator coil.
Suction Line
Discharge Line
Evaporator Coil
Condenser Coil
Metering
Compressor
Device
Refrigerant Drier Liquid
Refrigerant
Line
Strainer
The particular system design determines at exactly what point (in the evaporator) the change of state (i.e. liquid to a gas) takes place. In all cases, however, the refrigerant must be totally evaporated (changed) to a gas before leaving the evaporator coil. The low pressure (suction) created by the compressor causes the refrigerant to leave the evaporator through the suction line as a cool low pressure vapor. The refrigerant then returns to the compressor, where the cycle is repeated.
Figure 304 (Sequence of Operation)
30
Routine Maintenance
Coils & Chassis NOTE: Do not use a caustic (alakaline) or acidic cleaning
agent on coils or base pan. Use a biodegradable cleaning agent and
degreaser. The use of harsh cleaning materials may lead to deterioration of
the aluminum fins or the coil end plates. The indoor coil and outdoor coils
and base pan should be inspected periodically (annually or semi-annually) and
cleaned of all debris (lint, dirt, leaves, paper, etc.) as necessary. Under
extreme conditions, more frequent cleaning may be required. Clean the coils
with and base pan with a coil comb or soft brush and compressed air or vacuum.
A low pressure washer device may also be used; however, you must be careful
not to bend the aluminum fin pack. Use a sweeping up and down motion in the
direction of the vertical aluminum fin pack when pressure cleaning coils.
NOTE: It is extremely important to insure that none of the electrical and/ or
electronic parts of the unit get wet when cleaning.
Be sure to cover all electrical components to protect them from water or
spray. NOTE: When installed on or near sea coast environments, it recommended
that all coils be cleaned at minimum biannually.
Decorative Front Use a damp (not wet) cloth when cleaning the control area to
prevent water from entering the unit, and possibly damaging the electronic
control. The decorative front and the cabinet can be cleaned with warm water
and a mild liquid detergent. Do NOT use solvents or hydrocarbon based cleaners
such as acetone, naphtha, gasoline, benzene, etc. The indoor coil can be
vacuumed with a dusting attachment if it appears to be dirty. DO NOT BEND
FINS. The outdoor coil can be gently sprayed with a garden hose. The air
filter should be inspected weekly and cleaned if needed by vacuuming with a
dust attachment or by cleaning in the sink using warm water and a mild
dishwashing detergent. Dry the filter thoroughly before reinstalling. Use
caution, the coil surface can be sharp.
Fan Motor & Compressor The fan motor & compressor are permanently lubricated
and require no additional lubrication.
Wall Sleeve Inspect the inside of the wall sleeve and drain system
periodically (annually or semi-annually) and clean as required. Under extreme
conditions, more frequent cleaning may be necessary. Clean both of these areas
with an] bio-growth cleaner. Rinse both items thoroughly with water and ensure
that the drain outlets are operating correctly. Check the sealant around the
sleeve and reseal areas as needed. Inspect for bio-growth periodically. If
present, ensure the sealing gasket around the unit is in good condition and
not allowing outside air (or light) through the gasket. Blower Wheel / Housing
/ Condensor Fan / Shroud Inspect the indoor blower and its housing, evaporator
blade, condenser fan blade and condenser shroud periodically (yearly or bi-
yearly) and clean of all debris (lint, dirt, bio-growth etc.). Clean the
blower housing area and blower wheel with a bio-growth cleaner. Use a
biodegradable cleaning agent and degreaser on condenser fan and condenser
shroud. Use warm or cold water when rinsing these items. Allow all items to
dry thoroughly before reinstalling them. Electrical / Electronic Periodically
(at least yearly or bi-yearly) inspect all control components: electronic,
electrical and mechanical, as well as the power supply. Use proper testing
instruments (voltmeter, ohmmeter, ammeter, wattmeter, etc.) to perform
electrical tests. Use an air conditioning or refrigeration thermometer to
check room, outdoor and coil operating temperatures. Air Filter To ensure
proper unit operation, the air filter should be cleaned at least monthly, and
more frequently if conditions warrant. The unit must be turned off before the
filter is cleaned.
31
REMOVE AND INSTALL THE CHASSIS
Remove The Chassis
WARNING
ELECTRIC SHOCK HAZARD Turn off electric power before service or installation.
All electrical connections and wiring MUST be
the National Electrical Code and all local codes which have jurisdiction.
Failure to do so can result in personal injury or death.
WARNING
CUT/SEVER HAZARD Be careful with the sharp edges and corners. Wear protective
clothing and gloves, etc.
Failure to do so could result in serious injury.
Servicing / Chassis Quick Changeouts The chassis is designed for quick disconnect and change out. For minor electrical service, the control box cover lifts straight up after the screws & disconnect head are removed. For major electrical, refrigeration and fan service the chassis may be removed from utility closet.
To Remove the Chassis from the Closet:
A.
Disconnect the power coming into the unit from the main breaker panel or the closet mounted disconnect.
B.
Switch the wall Thermostat off.
C.
Pull the Power Disconnect located in the front of the chassis.
D.
Disconnect the electrical connection.
E.
Disconnect the duct work.
F.
Disconnect condensate drain on 9-18,000 BTU models (2018 18,000 BTU models excluded).
G.
Slide the chassis out of the wall plenum.
H.
Lift the chassis out of the utility closet.
32
EXTERNAL STATIC PRESSURE
External Static Pressure can best be described as the pressure difference
(drop) between the Positive Pressure (discharge) and the Negative Pressure
(intake) sides of the blower. External Static Pressure is developed by the
blower as a result of resistance to airflow (Friction) in the air distribution
system EXTERNAL to the VERT-I-PAK cabinet. Resistance applied externally to
the VERT-I-PAK (i.e. duct work, filters, etc.) on either the supply or return
side of the system causes an INCREASE in External Static Pressure accompanied
by a REDUCTION in airflow. External Static Pressure is affected by two
factors.
1.Resistance 2.Blower Speed (Changing to a higher or lower blower speed will
raise or lower the External Static Pressure accordingly). These affects must
be understood and taken into consideration when checking External Static
Pressure/Airfl ow to insure that the system is operating within design
conditions. Operating a system with insufficient or excessive airflow can
cause a variety of different operating problems. Among these are problems such
as, reduced capacity, freezing evaporator coils, premature compressor’ heating
component failures, and/ or other air local distribution issues.. System
airflow should always be verified upon completion of a new installation, or
before a change-out, compressor replacement, or in the case of heat strip
failure to insure that the failure was not caused by improper airflow.
Checking External Static Pressure
The airflow through the unit can be determined by measuring the external
static pressure of the system, and consulting the blower performance data for
the specific VERT-I-PAK.
1. Set up to measure external static pressure at the supply and return air.
2. Ensure the coil and filter are clean, and that all the registers are open.
3. Determine the external static pressure with the blower operating. Use a
digital manometer to measure. Measurement should be taken roughly 3-6″ from
the Vert-I-Pak collar and the center of the indoor coil with the filter
installed. 4. Refer to the Air Flow Data for your VERT-I-PAK system to find
the actual airflow for factory-selected fan speeds. 5. If the actual airflow
is either too high or too low, the blower speed will need to be changed to
appropriate setting or the ductwork will need to be reassessed and corrections
made as required. 6. Select a speed, which most closely provides the required
airflow for the system. 7. Recheck the external static pressure with the new
speed. External static pressure (and actual airflow) will have changed to a
higher or lower value depending upon speed selected. Recheck the actual
airflow (at this “new” static pressure) to confirm speed selection. 8. Repeat
steps 8 and 9 (if necessary) until proper airfl ow has been obtained. EXAMPLE:
Airflow requirements are calculated as follows: (Having a wet coil creates
additional resistance to airflow. This additional resistance must be taken
into consideration to obtain accurate airflow information.
33
External Static Pressure
Determining the Indoor CFM
MODEL
VHA 09/12
FAN SPEED LOW
HIGH
ESP (“)
CFM
0.0″
470
520
0.05″
460
510
0.10″
430
490
0.15″
410
470
0.20″
360
440
0.25″
310
400
0.30″
260
350
0.35″
—
—
0.40”
—
—
- values indicate rated performance point Table XXX (determining Indoor CFM)
VHA 18 LOW
730 670 630 595 550 505 455 400 345
HIGH
800 735 675 640 600 550 500 445 400
VHA 24 LOW
755 700 660 615 575 525 485 450 415
HIGH
805 750 700 665 625 580 540 500 465
Correct CFM (if needed): Correction Multipliers
230V
1.00
208V
0.97
265V
Heating
1.00
Cooling
0.95
Explanation of charts
Chart A is the nominal dry coil VERT-I-PAK CFMs. Chart B is the correction
factors beyond nominal conditions. 1 ½ TON SYSTEM ( 18,000 Btu) Operating on
high speed @ 230 volts with dry coil measured external static pressure .10 Air
Flow = 450 CFM In the same SYSTEM used in the previous example but having a
WET coil you must use a correction factor of .95 (i.e. 450 x .95=428 CFM) to
allow for the resistance (internal) of the condensate on the coil. It is
important to use the proper procedure to check external Static Pressure and
determine actual airfl ow. Since in the case of the VERT-I-PAK, the condensate
will cause a reduction in measured External Static Pressure for the given
airfl ow. It is also important to remember that when dealing with VERT-l-PAK
units that the measured External Static Pressure increases as the resistance
is added externally to the cabinet. Example: duct work, fi lters, grilles.
Indoor Airflow Data
The Vert-I-Pak A series units must be installed with a free return air
configuration. The table below lists the indoor airflow at corresponding
static pressures. All units are rarted at low speed. The Vert-I-Pak units are
designed for either single speed or two fan speed operation. For single speed
operation refer to the airflow table below and select the most appropriate CFM
based on the ESP level. Connect the fan output from the thermostat to the unit
on either the GL terminal for low speed or to the GH terminal for high speed
operation. For thermostats with two-speed fan outputs connect the low speed
output to the unit GL terminal and the high speed output to the GH terminal.
Ductwork Preparation
If flex duct is used, be sure all the slack is pulled out of the flex duct.
Flex duct ESP can increase considerably when not fully extended. DO NOT EXCEED
a total of .30 ESP, as this is the MAXIMUM design limit for the VERT-I-PAK
A-Series unit. IMPORTANT: FLEX DUCT CAN COLLAPSE AND CAUSE AIRFLOW
RESTRICTIONS. DO NOT USE FLEX DUCT FOR: 90 DEGREE BENDS, OR UNSUPPORTED RUNS
OF 5 FT. OR MORE.
34
External Static Pressure
Fresh Air Door
The Fresh Air Door is an “intake” system. The fresh air door opened via a
slide on the front of the chassis located just above the indoor coil. Move the
slide left to open and right to close the fresh air door. The system is
capable of up to 60 CFM of fresh air @ ~.3″ H20 internal static pressure.
Checking Approximate Airflow
If a digital manometer is not available to check the External Static Pressure,
or the blower performance data is unavailable for your unit, approximate
airflow call be calculated by measuring the temperature rise, then using tile
following criteria.
Kilowatts × 3413 CFM =
Temp Rise × 1.08
Electric Heat Strips
The approximate CFM actually being delivered can be calculated by using the following formula:
DO NOT simply use the Kilowatt Rating of the heater (i.e. 2.5, 3.4, 5.0) as this will result in a less-than-correct airfl ow cal-
culation. Kilowatts may be calculated by multiplying the measured voltage to the unit (heater) times the measured current
draw of all heaters (ONLY) in operation to obtain watts. Kilowatts are than obtained by dividing by 1000.
EXAMPLE: Measured voltage to unit (heaters) is 230 volts. Measured Current Draw of strip heaters is 11.0 amps.
230 x 11.0 = 2530
2530/1000 = 2.53 Kilowatts
2.53 x 3413 = 8635
Supply Air =
95°F
Return Air =
– 75°F
Temperature Rise = 20°F
20 x 1.08 = 21.6
8635 = 400
21.6
35
TROUBLESHOOTING
Error Codes and Alarm Status
Unit Control Panel The display shown below has four digits. The left two
digits indicate the error code # ( 1 to 24 ), The On/Off icons above these two
digits indicate the currents state of the error code. The right two digits
show the history count (up to 99) of the associated ERROR CODE. THE DISPLAY
CONTAINS A MAINTENANCE ICON (WRENCH) THAT WILL ILLUMINATE TO INDICATE WHEN THE
UNIT NEEDS SERVICE. THIS WRENCH INDICATES AN ERROR CODE # IS ON (ACTIVE). TO
FIND OUT WHICH ONE, CHECK ALL ERROR CODES.
FIGURE 715 (SERVICE MODULE CONNECTOR)
CHECK ERROR CODES
Press the Enter key to activate the display.
Each press of the scroll key display the next error code.
Clear History Counters
Press & hold the Enter key and the Scroll Key for 6 seconds.
36
TROUBLESHOOTING
Error Codes and Alarm Status
DIAG CODE
1
2
3
4
5
PROBLEM
Front Panel Button Stuck For More Than 20 Seconds Input Voltage Out of
Specification (187 253) Indoor Temperature Sensor is Open or Shorted Indoor
Coil Temperature Sensor is Open or Shorted Outdoor Coil Temperature Sensor is
Open or Shorted
CONTROL BOARD’S ACTION
Continue to monitor for “OPEN” (Unstuck) switch. Do not process switch input.
Unit stops, open all relays until voltage is back within specs then resume
operation.
Unit defaults to 75°F in COOLING or 68°F in HEATING and will continue to
operate if setting is below 75°F in cool mode or if above 68°F in heat mode.
The unit’s control board defaults to 40°F. It will override the sensor and the
unit will continue to operate.
The unit defaults to 20°F, overriding the sensor. The unit will continue to
operate. Using Elec Heat if available for HEATING. If not available, it will
use HEAT PUMP if the outdoor temperature allows.
6 Outdoor Coil > (grater than) 175 F
The unit will shut down for 5 minutes. resume operation for 3 minutes. If test fails 3 times, the unit operation is locked out. See troubleshooting figure 715. To reset, turn power off and on.
7 Indoor Coil < (less than) 30 F for 2 consecutive minutes
The compressor will turn off and the High Fan speed will run. When coil temp reachs 45°F the unit will resume operation after lockout time.
8 Unit Cycles > (greater than) 9 Times per The unit will continue to operate and be monitored. hour
9 Unit Cycles < (less than) 3 Times per Hour The unit will continue to operate and be monitored.
11 WallStat Problem or Connection Issue
The unit will not operate.
13 VPAK 18K, 24K Unit Only High Pressure Limit Switch is Open
If unit is cooling or heat pump is on, shut down compressor. Run high fan until switch closes, then resume operation. The third occurance in 1 hour locks unit out. Applicable to 24K unit only. To reset, turn power off and on.
15 Heat Pump Error
If indoor coil temperature is less than ambient temperature for 3 minutes, the unit will use electric heat to satisfy the heating demand. Causes could be bad reversing valve, heat load too high.
16 Temperature beyond operating limits
Occurs if the indoor ambient temperature range falls below 0°F or greater than 130°F. The error code will remain on until the temperature reaches the operating range and then the unit will return to normal operation.
17 Equipment Doesn’t Meet Minimum Configuration
The compressor must be enabled and have at least 2 fan speeds.
22 (Not an error code) Outdoor Coil Temperature < 30 F for 2 consecutive minutes
Unit will use electric heat to satisfy heating demands until the temperature equals or exceeds 45°F. Applicable for Heat Pump models only.
FIGURE 715 (ERROR CODES AND ALARM STATUS) 37
TROUBLESHOOTING
Electrical TroubleshootingChart- Cooling
9K Btu, 12K Btu, & 18K Btu
38
FIGURE 716 (TROUBLESHOOTING)
TROUBLESHOOTING
Electrical TroubleshootingChart- Cooling
24K Btu
See Component Testing 24k Indoor Blower
FIGURE 717 (TROUBLESHOOTING)
39
TROUBLESHOOTING
Electrical Troubleshooting Chart – Heat Pump
HEAT PUMP MODE
System cools when heating is desired
Is line voltage present at solenoid valve?
NO
YES
Replace Solenoid
Is the solenoid coil
NO
YES
Coil
good?
YES
Is the reversing valve stuck?
YES
Replace Solenoid Coil
Is selector switch set for heat?
YES
Is room TSTAT configured for B
signal?
NO
Configure TSTAT for B signal
FIGURE 718 (TROUBLESHOOTING) 40
TROUBLESHOOTING
Troubleshooting Chart – Cooling
FIGURE 719 (TROUBLESHOOTING) 41
COMPONENT TESTING
Capillary Tube and Check Valve Assy (Heat Pump Units)
WARNING
BURN HAZARD Proper safety procedures must be followed, and proper protective
clothing must be worn when working with a torch.
Failure to follow these procedures could result in moderate or serious injury.
WARNING
CUT/SEVER HAZARD Be careful with the sharp edges and corners. Wear protective
clothing and gloves, etc.
Failure to do so could result in serious injury.
CHECK VALVE OPERATION
Check Valves 2 check valves are installed on Heat pump units. They are
pressure operated and used to direct the flow of refrigerant to the proper
capillary tube during either the heating or cooling cycle.
COOLING MODE In the cooling mode of operation, high pressure liquid enters the
check valve forcing the slide to close the opposite port (liquid line) to the
indoor coil. Refer to figure 701a. This directs the refrigerant through the
cooling capillary tube to the indoor coil.
HEATING MODE In the heating mode of operation, high pressure refrigerant
enters the check valve from the opposite direction, closing the port (liquid
line) to the outdoor coil. The flow path of the refrigerant is then through
the heating capillary to the outdoor coil. Failure of the slide in the check
valve to seat properly in either mode of operation will cause flooding of the
cooling coil. This is due to the refrigerant bypassing the heating or cooling
capillary tube and entering the liquid line.
Test the Capillary Tube and Check Valve Assy Allow unit to run for ten minutes
before checking temps in order for unit to stabilize. Units tested at low
ambient temps may frost momentarily, but will retun to normal once unit
pressure stabilizes. If frost does not stop after 10 minutes then a possible
restricition or low refrigerant charge may be present.
1. Check the capillary tube temperature by hand where the refrigerant enters
the capillary tube. A partial restriction of the capillary tube will be
indicated by frost or freezing in that area. 2. If check valve fails closed or
the capillary tube is fully restricted, then pressure will increase and
pressure switch will open if installed. If no pressure switch is installed,
the unit will shut down due to the compressor overload opening.High discharge
temperature will be present at the compressor. 3. If check valve fails open
the unit will continue to run, but there will be little to no cooling or
heating. In normal operation, the tube will be cooler on the side where the
coolant is entering the cap tube then where it exits. If the check valve is
stuck open, there will be little difference in temperature.
Arrows Indicate Direction of Flow in Heating Mode Arrows Indicate Direction of Flow in Cooling Mode
Reversing Valve
Accumulator
Indoor Coil (Evaporator)
Compressor
Cap Tube (Heating)
Check Valve
Outdoor Coil (Condensor)
Cap Tube Cooling
Figure 701a (Heat Pump Refigerant Flow) 42
COMPONENT TESTING
Capillary Tube Assy (Cool Only Units)
Test the Capillary Tube and Check Valve Assy 1. Check the capillary tube
temperature by hand where the refrigerant enters the capillary tube. A partial
restriction of the capillary tube will be indicated by frost or freezing in
that area. 2. If the capillary tube is fully restricted, then pressure will
increase and pressure switch will open if installed. If no pressure switch is
installed, the unit will shut down due to the compressor overload opening.
High discharge temperature will be present at the compressor.
Arrows Indicate Direction of Flow
Accumulator
Indoor Coil (Evaporator)
Compressor
Outdoor Coil (Condensor)
Cap Tube (Cooling Only)
Figure 701b (Cooling Only Refigerant Flow)
43
COMPONENT TESTING
Reversing Valve Description And Operation
The Reversing Valve controls the direction of refrigerant flow to the indoor
and outdoor coils. It consists of a pressure-operated, main valve and a pilot
valve actuated by a solenoid plunger. The solenoid is energized during the
heating cycle only. The reversing valves used in the RAC system is a
2-position, 4-way valve. The single tube on one side of the main valve body is
the high-pressure inlet to the valve from the compressor. The center tube on
the opposite side is connected to the low pressure (suction) side of the
system. The other two are connected to the indoor and outdoor coils. Small
capillary tubes connect each end of the main valve cylinder to the “A” and “B”
ports of the pilot valve. A third capillary is a common return line from these
ports to the suction tube on the main valve body. Four-way reversing valves
also have a capillary tube from the compressor discharge tube to the pilot
valve. The piston assembly in the main valve can only be shifted by the
pressure differential between the high and low sides of the system. The pilot
section of the valve opens and closes ports for the small capillary tubes to
the main valve to cause it to shift. NOTE: System operating pressures must be
near normal before valve can shift.
B A
Figure 702 (Reversing Valve) 44
COMPONENT TESTING
Testing The Reversing Valve Solenoid Coil
WARNING
ELECTRIC SHOCK HAZARD Disconnect power to the unit before servicing. Failure
to follow this warning could result in serious injury or death.
The solenoid coil is an electromagnetic type coil mounted on the reversing
valve and is energized during the operation of the compressor in the heating
cycle. 1. Turn off high voltage electrical power to unit. 2. Unplug line
voltage lead from reversing valve coil. 3. Check for electrical continuity
through the coil. If you do not have continuity replace the coil. 4. Check
from each lead of coil to the copper liquid line as it leaves the unit or the
ground lug. There should be no continuity between either of the coil leads and
ground; if there is, coil is grounded and must be replaced. 5. If coil tests
okay, reconnect the electrical leads. 6. Make sure coil has been assembled
correctly.
NOTE: Do not start unit with solenoid coil removed from valve, or do not
remove coil after unit is in operation. This will cause the coil to burn out.
WARNING BURN HAZARD Proper safety procedures must be followed, and proper
protective clothing must be worn when working with a torch.
Touch Test in Heating/Cooling Cycle
WARNING
BURN HAZARD Certain unit components operate at temperatures hot enough to
cause burns. Proper safety procedures must be followed, and proper protective
clothing must be worn. Failure to follow these procedures could result in
minor to moderate injury.
The only definite indications that the slide is in the mid-position is if all
three tubes on the suction side of the valve are hot after a few minutes of
running time. NOTE: If both tubes shown as hot or cool are not the same
corresponding temperature, refer to figure 703, then the reversing valve is
not shifting properly.
45
COMPONENT TESTING
Checking The Reversing Valve
WARNING
HIGH PRESSURE HAZARD Sealed Refrigeration System contains refrigerant and oil
under high pressure. Proper safety procedures must be followed, and proper
protective clothing must be worn when working with refrigerants. Failure to
follow these procedures could result in serious injury or death.
NOTE: You must have normal operating pressures before the reversing valve can
shift. Check the operation of the valve by starting the system and switching
the operation from “Cooling” to “Heating” and then back to “Cooling”. Rapidly
cycle. Do not hammer on valve. Occasionally, the reversing valve may stick in
the heating or cooling position or in the mid-position. When sluggish or stuck
in the mid-position, part of the discharge gas from the compressor is directed
back to the suction side, resulting in excessively high suction pressure.
Should the valve fail to shift from cooling to heating, block the air flow
through the outdoor coil and allow the discharge pressure to build in the
system. Then switch the system from heating to cooling. If the valve is stuck
in the heating position, block the air flow through the indoor coil and allow
discharge pressure to build in the system. Then switch the system from heating
to cooling. Should the valve fail to shift in either position after increasing
the discharge pressure, replace the valve. Dented or damaged valve body or
capillary tubes can prevent the main slide in the valve body from shifting. If
you determing this is the problem, replace the reversing valve. After all of
the previous inspections and checks have been made and determined correct,
then perform the “Touch Test” on the reversing valve.
Reversing Valve in Heating Mode Figure 703 (Checking The Reversing Valve)
46
COMPONENT TESTING
Touch Test Chart : To Service Reversing Valves
NORMAL FUNCTION OF VALVE
DISCHAfDIrRoSCmGHCAEoRmGTpEreUTsUsBoBrEE from Compressor
SUCTION TUBE
SUCTIO toN CTomUprBesEsotro Compressor
Tube toTTuuIbbeeNttoSoIIINnDSdIoEDorE C COIOILL
Tube to OUTSIDE COIL
LEFT Pilot
LEFTCapiPlillaroyt Tube Capillary Tube
RIGHT Pilot
RIGHCTapillPialryotTube Capillary Tube
VALVE OPERATING CONDITION
NOTES:
- TEMPERATURE OF VALVE BODY ** WARMER THAN VALVE BODY
1 2 3 45 6
POSSIBLE CAUSES
CORRECTIONS
Normal Cooling Hot Normal Heating Hot
Cool Cool
Cool as (2)
Hot as (1)
Hot as (1)
*TVB
TVB
Cool as (2)
*TVB
TVB
MALFUNCTION OF VALVE
Check Electrical circuit and coil
Check refrigeration charge
Valve will not
shift from cool
to heat.
Hot
Cool
Cool, as (2)
Hot, as (1)
*TVB
No voltage to coil.
Repair electrical circuit.
Defective coil.
Replace coil.
Low charge.
Repair leak, recharge system.
Pressure differential too high.
Recheck system.
Deenergize solenoid, raise head pressure,
reenergize solenoid to break dirt loose.
Hot
Pilot valve okay. Dirt in one bleeder hole.
If unsuccessful, remove valve, wash out. Check on air before installing. If no
movement, replace valve, add strainer to
discharge tube, mount valve horizontally.
Piston cup leak
Stop unit. After pressures equalize, restart with solenoid energized. If valve shifts, reattempt with compressor running. If still no shift, replace valve.
Hot
Valve will not shift from cool Hot
to heat.
Warm
Hot
Cool
Cool, as (2)
Cool
Cool, as (2)
Cool
Cool, as (2)
Warm Warm
Hot, as (1)
*TVB
Hot, as (1)
Hot
Hot, as (1)
*TVB
Hot *TVB
*TVB Hot
Clogged pilot tubes.
Raise head pressure, operate solenoid to free. If still no shift, replace valve.
Both ports of pilot open. (Back seat port did not close).
Raise head pressure, operate solenoid to free partially clogged port. If still no shift, replace valve.
Warm Defective Compressor.
Replace compressor
Not enough pressure differential at start Check unit for correct operating pressures
Hot of stroke or not enough fl ow to maintain and charge. Raise head pressure. If no
pressure differential.
shift, use valve with smaller port.
Body damage.
Replace valve
Starts to shift Hot but does not
complete
Hot
reversal.
Warm Warm
Hot
Hot
Hot Hot Hot *TVB
Hot Both ports of pilot open.
Raise head pressure, operate solenoid. If no shift, use valve with smaller ports.
Hot Body damage.
Replace valve
Valve hung up at mid-stroke. Pumping volume of compressor not suffi cient to maintain reversal.
Raise head pressure, operate solenoid. If no shift, use valve with smaller ports.
Hot
Apparent
Hot
leap in heat-
ing.
Hot
Hot
Hot
Will not shift from heat to
cool.
Hot
14
Hot
Warm
Hot
Hot
Cool Cool Cool
Hot, as (1)
Hot, as (1)
Hot, as (1)
Cool
Hot, as (1)
Cool
Hot, as (1)
Cool Cool
Hot, as (1)
Warm, as (1)
Hot Hot
Cool, as (2)
*TVB
Cool, as (2)
**WVB
Cool, as (2)
*TVB
Cool, as (2)
Hot
Cool, as (2)
Hot
Cool, as (2)
Hot
Cool, as (2)
Warm
Hot Both ports of pilot open. *TVB Piston needle on end of slide leaking.
*WVB Pilot needle and piston needle leaking. TVB Pressure differential too
high.
Clogged pilot tube.
TVB Dirt in bleeder hole.
TVB Piston cup leak.
Hot Defective pilot. *TVB Defective compressor.
Raise head pressure, operate solenoid. If no shift, replace valve.
Operate valve several times, then recheck. If excessive leak, replace valve.
Operate valve several times, then recheck. If excessive leak, replace valve.
Stop unit. Will reverse during equalization period. Recheck system
Raise head pressure, operate solenoid to free dirt. If still no shift, replace
valve.
Raise head pressure, operate solenoid. Remove valve and wash out. Check on air
before reinstalling, if no movement, replace valve. Add strainer to discharge
tube. Mount valve horizontally.
Stop unit. After pressures equalize, restart with solenoid deenergized. If
valve shifts, reattempt with compressor running. If it still will not reverse
while running, replace the valve.
Replace valve.
Replace compressor
Figure 704 (Touch Test Chart)
47
COMPONENT TESTING
Compressor Checks
WARNING
ELECTRIC SHOCK HAZARD Turn off electric power before service or installation.
All electrical connections and wiring MUST be
the National Electrical Code and all local codes which have jurisdiction.
Failure to do so can result in personal injury or death.
WARNING
BURN HAZARD Proper safety procedures must be followed, and proper protective
clothing must be worn when working with a torch.
Failure to follow these procedures could result in moderate or serious injury.
Locked Rotor Voltage (L.R.V.) Test Locked rotor voltage (L.R.V.) is the actual voltage available at the compressor under a stalled condition.
Single Phase Connections Disconnect power from unit. Using a voltmeter, attach one lead of the meter to the run “R” terminal on the compressor and the other lead to the common “C” terminal of the com-pressor. Restore power to unit.
Determine L.R.V. Start the compressor with the volt meter attached; then stop the unit. Attempt to restart the compressor within a couple of seconds and immediately read the voltage on the meter. The compressor under these conditions will not start and will usually kick out on overload within a few seconds since the pressures in the system will not have had time to equalize. Voltage should be at or above minimum voltage of 197 VAC, as specified on the rating plate. If less than minimum, check for cause of inadequate power supply; i.e., incorrect wire size, loose electrical connections, etc.
Amperage (R.L.A) Test The running amperage of the compressor is the most important of these readings. A running amperage higher than that indicated in the performance data indicates that a problem exists mechanically or electrically.
Single Phase Running and L.R.A. Test NOTE: Consult the specification and performance section for running amperage. The L.R.A. can also be found on the rating plate. Select the proper amperage scale and clamp the meter probe around the wire to the “C” terminal of the compressor. Turn on the unit and read the running amperage on the meter. If the compressor does not start, the reading will indicate the locked rotor amperage (L.R.A.).
Overloads The compressor is equipped with either an external or internal overload which senses both motor amperage and winding temperature. High motor temperature or amperage heats the overload causing it to open, breaking the common circuit within the compressor. Heat generated within the compressor shell, usually due to recycling of the motor, is slow to dissipate. It may take anywhere from a few minutes to several hours for the overload to reset.
Checking the Overloads
External Overloads VPAK 9, 12, and 18K BTUs With power off, remove the leads from compressor terminals. If the compressor is hot, allow the overload to cool before starting check. Using an ohmmeter, test continuity across the terminals of the external overload. If you do not have continuity; this indicates that the overload is open and must be replaced.
Internal Overloads VPAK 24k BTUs The overload is embedded in the motor windings to sense the winding temperature and/or current draw. The overload is connected in series with the common motor terminal. Should the internal temperature and/or current draw become excessive, the contacts in the overload will open, turning off the compressor. The overload will automatically reset, but may require several hours before the heat is dissipated.
Checking the Internal Overload WARNING: Make sure Compressor is cool to the
touch prior to OHMs testing. 1. With no power to unit, remove the leads from
the compressor terminals. 2. Using an ohmmeter, test continuity between
terminals C-S and C-R. If no continuity, the compressor overload is open and
the compressor must be replaced.
48
COMPONENT TESTING
Compressor Checks
WARNING
ELECTRIC SHOCK HAZARD Turn off electric power before service or installation.
Extreme care must be used, if it becomes necessary to work on equipment with
power applied.
Failure to do so could result in serious injury or death.
WARNING
HIGH PRESSURE HAZARD Sealed Refrigeration System contains refrigerant and oil
under high pressure.
Proper safety procedures must be followed, and proper protective clothing must
be worn when working with refrigerants.
Failure to follow these procedures could result in serious injury or death.
Single Phase Resistance Test Remove the leads from the compressor terminals and set the ohmmeter on the lowest scale (R x 1). Touch the leads of the ohmmeter from terminals common to start (“C” to “S”). Next, touch the leads of the ohmmeter from terminals common to run (“C” to “R”). Add values “C” to “S” and “C” to “R” together and check resistance from start to run terminals (“S” to “R”). Resistance “S” to “R” should equal the total of “C” to “S” and “C” to “R.” In a single phase PSC compressor motor, the highest value will be from the start to the run connections (“S” to “R”). The next highest resistance is from the start to the common connections (“S” to “C”). The lowest resistance is from the run to common. (“C” to “R”) Before replacing a compressor, check to be sure it is defective.
GROUND TEST
Use an ohmmeter set on its highest scale. Touch one lead to the compressor body (clean point of contact as a good connection
is a must) and the other probe in turn to each compressor terminal. If a reading is obtained the compressor is grounded and
must be replaced.
Check the complete electrical system to the compressor and compressor internal electrical system, check to be certain that
compressor is not out on internal overload.
Complete evaluation of the system must be made whenever you suspect the
compressor is defective. If the compressor has been operating for sometime, a
careful examination must be made to determine why the compressor failed.
Many compressor failures are caused by the following conditions:
1.Improper air flow over the evaporator.
2.Overcharged refrigerant system causing liquid to be returned to the
compressor.
3.Restricted refrigerant system.
4.Lack of lubrication.
5.Liquid refrigerant returning to compressor causing oil to be washed out of
bearings.
Figure 705 (Resistance Chart)
6.Noncondensables such as air and moisture in the system. Moisture is extremely destructive to a refrigerant system.
7.Capacitor.
CHECKING COMPRESSOR EFFICIENCY
The reason for compressor inefficiency is normally due to broken or damaged suction and/or discharge valves, reducing the
ability of the compressor to pump refrigerant gas.
NOTE: Before installing valves and gauges, check the compressor discharge temperature and compressor current, Low compressor amperage combined with low discharge temperature is an indication that the compressor might be faulty,
This condition can be checked as follows: 1. Install a piercing valve on the
suction and discharge or liquid process tube. 2. Attach gauges to the high and
low sides of the system.3. Start the system and run a “cooling or heating
perfor mance test.” If test shows: A. Below normal high side pressure B. Above
normal low side pressure C. Low temperature difference across coil
The compressor valves are faulty – replace the compressor.
49
COMPONENTS TESTING
Fan Motor
A single phase permanent split capacitor motor is used to drive the evaporator
blower and condenser fan. A selfresetting overload is located inside the motor
to protect against high temperature and high amperage conditions.
WARNING
ELECTRIC SHOCK HAZARD
Turn off electric power before service or installation. Extreme care must be
used, if it becomes necessary to work on equipment with power applied.
Failure to do so could result in serious injury or death.
Figure 706 (Blower/ Fan Motor)
Blower / Fan Motor Test 1. Visually inspect the motor’s wiring, housing etc., and determine that the capacitor is serviceable. 2. Make sure the motor has cooled down. 3. Disconnect the fan motor wires from the control board. 4. Test for continuity between the windings also, test to ground. 5. If any winding is open or grounded replace the motor.
Capacitors
WARNING
Dual Rated Run Capacitor Hook-up
ELECTRIC SHOCK HAZARD
Turn off electric power before service or installation. Extreme care must be
used, if it becomes necessary to work on equipment with power applied.
Failure to do so could result in serious injury or
death.
Figure 707 Dual Rated Capacitor Hook-Up
Many motor capacitors are internally fused. Shorting the terminals will blow the fuse, ruining the capacitor. A 20,000 ohm 2 watt resistor can be used to discharge capacitors safely. Remove wires from capacitor and place resistor across terminals. When checking a dual capacitor with a capacitor analyzer or ohmmeter, both sides must be tested.
Capacitor Check The meter will show whether the capacitor is “open” or “shorted.” It will tell whether the capacitor is within its micro farads rating and it will show whether the capacitor is operating at the proper power-factor percentage. The instrument will automatically discharge the capacitor when the test switch is released.
Capacitor Connections The starting winding of a motor can be damaged by a shorted and grounded running capacitor. This damage usually can be avoided by proper connection of the running capacitor terminals. From the supply line on a typical 230 volt circuit, a 115 volt potential exists from the “R” terminal to ground through a possible short in the capacitor. However, from the “S” or start terminal, a much higher potential, possibly as high as 400 volts, exists because of the counter EMF generated in the start winding. Therefore, the possibility of capacitor failure is much greater when the common terminal is connected to the “S” or start terminal. The common terminal should always be connected to the
supply line, or “R” terminal, never to the “S” terminal. When connected properly, a shorted or grounded running capacitor will result in a direct short to ground from the “R” terminal and will blow the line fuse. The motor protector will protect the main winding from excessive temperature.
50
COMPONENTS TESTING
Heating Element and Limit Switch
WARNING
ELECTRIC SHOCK HAZARD Turn off electric power before service or installation.
Extreme care must be used, if it becomes necessary to work on equipment with
power applied.
Heating Element Example
Failure to do so could result in serious injury or death.
Figure 708 (Heating Element)
All heat pumps and electric heat models are equipped with a heating element and a limit switch (bimetal thermostat). The limit switches are in series with the element and will interrupt the power at a designed temperature. Should the blower motor fail, filter become clogged or air-flow be restricted etc., the high limit switch will open and interrupt the power to the heater before reaching an un-safe temperature condition.
Heater Elements And Limit Switches’ Specifications
VPAK 9K, 12K and 18K BTUs Models: 2.5 KW, 230 V, Resistance 18.61 Ohms + – 5%.
Has 1 Limit Switch, Opens at 120° F, Closes at 90° F, It has a One Time Open
Temp. of 145° F.
3.4 KW, 230 V, Resistance 13.68 Ohms + – 5%. Has 1 Limit Switch, Opens at 120° F, Closes at 90° F, It has a One Time Open Temp. of 145° F.
5 KW, 230 V, Resistance 9.31 Ohms + – 5%. Has 1 Limit Switch, Opens at 130° F, Closes at 100° F, It has a One Time Open Temp. of 155° F. VPAK 24K BTUs Models:
2.5 KW, 265 V, Resistance 24.86 Ohms + – 5%. Has 2 Limit Switches, Primary Opens at 120° F, Closes at 90° F, Secondary’s Open Temp. is 145° F.
3.4 KW, 265 V, Resistance 13.68 Ohms + – 5%. Has 2 Limit Switches, Primary Opens at 120° F, Closes at 90° F, Secondary’s Open Temp. is 145° F.
5 KW, 265 V, Resistance 9.31 Ohms + – 5%. Has 2 Limit Switches, Primary Opens at 130° F, Closes at 100° F, Secondary’s Open Temp. is 155° F. 7.5 KW, 265 V (composed of 2, 3.7 KW Elements) Each Has a Resistance of 16.47 Ohms + – 5%. Each Has 2 Limit Switches, Primary Opens at 155° F, Closes at 125° F With a 1 time Open Temp. of 200° F. Secondary Limit’s Open Temp. is 200° F.
51
COMPONENTS TESTING
Heating Element and Limit Switch
VPAk 24K models 2.5 KW, 230 V, Resistance 18.61 Ohms + – 5%. Has 1 Limit
Switch, Opens at 155° F, Closes at 125° F, It has a One Time Open Temp. of
200° F. 3.4 KW, 230 V, Resistance 13.68 Ohms + – 5%. Has 1 Limit Switch, Opens
at 155° F, Closes at 125° F, It has a One Time Open Temp. of 200° F. 5 KW, 230
V, Resistance 9.31 Ohms + – 5%. Has 1 Limit Switch, Opens at 155° F, Closes at
125° F, It has a One Time Open Temp. of 200° F. VPAK 24K BTUs Models: 7.5 KW,
230 V (composed of 2, 3.7 KW Elements) Each Has a Resistance of 12.41 Ohms + –
5%. Each Has 2 Limit Switches, Primary Opens at 165° F, Closes at 135° F With
a 1 time Open Temp. of 210° F. Secondary Limit’s Open Temp. is 200° F. 10 KW,
230 V (composed of 2, 5 KW Elements) Each Has a Resistance of 9.31 Ohms + –
5%. Each Has 2 Limit Switches, Primary Opens at 165° F, Closes at 135° F With
a 1 time Open Temp. of 210° F. Secondary Limit’s Open Temp. is 200° F.
2.5 KW, 265 V, Resistance 24.71 Ohms + – 5%. Has 2 Limit Switches, Primary
Opens at 155° F, Closes at 125° F, Secondary’s Open Temp. is 200° F. 3.4 KW,
265 V, Resistance 18.17 Ohms + – 5%. Has 2 Limit Switches, Primary Opens at
155° F, Closes at125° F, Secondary’s Open Temp. is 200° F. 5 KW, 265 V,
Resistance 12.35 Ohms + – 5%. Has 2 Limit Switches, Primary Opens at 165° F,
Closes at 135° F, Secondary’s Open Temp. is 200° F. 7.5 KW, 265 V (composed of
2, 3.7 KW Elements) Each Has a Resistance of 16.47 Ohms + – 5%. Each Has 2
Limit Switches, Primary Opens at 155° F, Closes at 125° F With a 1 time Open
Temp. of 200° F. Secondary Limit’s Open Temp. is 200° F. 10 KW, 265 V
(composed of 2, 5 KW Elements) Each Has a Resistance of 12.35 Ohms + – 5%.
Each Has 2 Limit Switches, Primary Opens at 155° F, Closes at 125° F With a 1
time Open Temp. of 200° F. Secondary Limit’s Open Temp. is 200° F. NOTE:
Always replace with an exact replacement. Testing The Heating Element Testing
of the elements can be made with an ohmmeter across the terminals after the
connecting wires have been removed.
52
COMPONENTS TESTING
WARNING
ELECTRIC SHOCK HAZARD Turn off electric power before service or installation.
Extreme care must be used, if it becomes necessary to work on equipment with
power applied.
Bellows Assembly Drain Pan Valve
Failure to do so could result in serious injury or death.
Drain Pan Valve
During the cooling mode of operation, condensate which
collects in the drain pan is picked up by the con-denser fan blade and sprayed onto the condenser coil. This
Figure 709 Drain Pan Valve
assists in cooling the refrigerant plus evaporating the
water.
During the heating mode of operation, it is necessary that water be removed to prevent it from freezing during cold outside
temperatures. This could cause the condenser fan blade to freeze in the accumulated water and prevent it from turning.
To provide a means of draining this water, a bellows type drain valve is installed over a drain opening in the base pan.
This valve is temperature sensitive and will open when the outside temperature reaches 40°F. The valve will close gradually as
the temperature rises above 40°F to fully close at 60°F.
To test the drain pan valve; 1) Place a pack of ice on the capillary 2) Ensure that the valve opens as it cools down. 3) remove the pack of ice. 4) Ensure that the valve closes fully as the valve warms back up.
53
COMPONENTS TESTING
Testing the Diagnostic Service Module
Testing the Electronic Control Board
WARNING
ELECTRIC SHOCK HAZARD Turn off electric power before service or installation.
Extreme care must be used, if it becomes necessary to work on equipment with
power applied.
Failure to do so could result in serious injury or death.
If the Diagnostic Service Module does not turn on: 1. Make sure there is
208/230 VAC to the unit and that it is turned on. 2. Disconnect the diagnostic
service module’s wire harness on the control board. 3. Using a voltmeter,
check the fi rst two pins to the left of the female connector (see picture
below).
There should be up to 5VDC. 4. If there is no voltage, replace the electronic
control board. 5. If there is voltage, check the wire harness and connections
at the electronic control board and the diagnostic service module. 6. IF THE
CONNECTIONS AND THE WIRE HARNESS ARE GOOD, REPLACE THE DIAGNOSTIC SERVICE
MODULE.
FIGURE 711 (DIAGNOSTIC SERVICE MODULE)
FIGURE 712 (SERVICE MODULE CONNECTOR)
TEST HERE UP TO 5VDC. IF NO VOLTAGE, REPLACE BOARD. IF THERE IS 5VDC, CHECK
CONNECTIONS AND CABLE. IF OK, REPLACE SERVICE MODULE.
54
COMPONENT TESTING
Electronic Control Board Components Identification And Testing
Front
VPAK 24K
Back
High Pressure Switch
Reversing Valve Not Used
Not Used
Not Used High Speed Not Used Low Speed
Diagnostic Servicer Module Not Used T-stat Terminals
Not Used
Transformer 115/230 Volts
(Blue) (Green)
Transformer voltage Selector Switch 115/230 Volts Ensure it is set at 230VAC
Fuse 10 Amps 250 VAC
FIGURE 713 (ECB ID AND TESTING)
1. Test for power at L1 and L2 for 208/230 VAC. (Ensure the transformer voltage selector switch is set for 230 VAC) 2. TEST THE 10 AMP/250 VAC FUSE FOR CONTINUITY.
FOR THE FOLLOWING TESTS, ENSURE THE UNIT IS IN THE APPROPRIATE SETTINGS FOR THE TEST BEING PERFORMED. ENSURE THERE ARE NO ERROR CODES ACTIVE.
3. Testing the compressor relay and heat relays: Test for power in and power
out. If there is power in and no power out, replace the electronic control
board.(208/230 to L2) 4. Testing the fan and reversing valve relays: Test for
power at the reversing valve and fan relays 1 or 3. (208/230 to L2) 5. Testing
the transformer: Test the low voltage terminal strip at: R and C for 24 VAC F2
and F1 for 24 VAC D2 and D1 for 24 VAC Test the service module connector for 5
VDC (see prior page) Test the connectors for the thermistors for up to 5 VDC
If there is no voltage at any of the above, replace electronic control board.
6. Testing the thermistors: Disconnect the thermistor and test for resistance
value (see figure 710). 7. Testing the high pressure switch (VPAK 18K, 24K
only). Test for 24 VAC at board, if there is no voltage, replace the
electronic control. Test the pressure switch for continuity, if none, replace
it (switch is normally closed).
55
COMPONENT TESTING
24k Indoor Blower Motor
Check for appropriate Line Voltage at L and N
No Trace wiring to find problem
Yes
Check for 10 vdc at green and brown wire at pins C and D.
No If no voltage is present, remove harness and jump C and D. If fan runs, blower circuit board is bad.
Yes
engage fan in either High or Low speed. Values between B and D should be: Low
Speed – 6.37VDC +/- 0.05 High Speed – 8.12VDC +/- 0.05
Replace Fan No
Indoor Blower Circuit Board
FIGURE 714 (INDOOR BLOWER MOTOR TESTING) 56
R-410A SEALED SYSTEM REPAIR
WARNING
Use approved standard refrigerant recovering procedures and equipment to relieve high pressure before opening system for repair.
Do not allow liquid refrigerant to contact skin. Direct contact with liquid refrigerant can result in minor to moderate injury.
Be extremely careful when using an oxy-acetylene torch. Direct contact with the torch’s flame or hot surfaces can cause serious burns.
Make certain to protect personal and surrounding property with fire proof materials and have a fire extinguisher at hand while using a torch.
P.Arlwovaiydseuasdeeaquparteessvuernetilraetgiounlattoorvewnhteonffutsoixnigc
fumes, and work with a qualified assistant whenever possible. dry nitrogen to test the sealed refrigeration system for leaks, flushing
etc.
WARNING
Refrigeration system under high pressure
O service this equipment. R410A systems operate at higher pressures than R22
equipment. Appropriate safe service and handling practicces must be used. Only
use gauge sets designed for use with R410A. Do not use standard R22 gauge
sets.
The following is a list of important considerations when working with R-410A
equipment 1. R-410A pressure is approximately 60% higher than R-22 pressure.
2. R-410A cylinders must not be allowed to exceed 125 F, they may leak or
rupture. 3. R-410A must never be pressurized with a mixture of air, it may
become flammable. 4. Servicing equipment and components must be specifically
designed for use with R-410A and dedicated to prevent contamination.
5. Manifold sets must be equipped with gauges capable of reading 750 psig
(high side) and 200 psig (low side), with a 500-psig low-side retard. 6. Gauge
hoses must have a minimum 750-psig service pressure rating 7. Recovery
cylinders must have a minimum service pressure rating of 400 psig, (DOT 4BA400
and DOT BW400 approved cylinders). 8. POE (Polyol-Ester) lubricants must be
used with R-410A equipment. 9. To prevent moisture absorption and lubricant
contamination, do not leave the refrigeration system open to the atmosphere
longer than 1 hour. 10. Weigh-in the refrigerant charge into the high side of
the system. 11. Introduce liquid refrigerant charge into the high side of the
system. 12. For low side pressure charging of R-410A, use a charging adaptor.
13. Use industry standard R-410A filter dryers.
57
WARNING
EPA 608 Warning: It is a violation of the environmental Protection Agency,
Clause 608A, to service refrigeration systems without proper certification
EQUIPMENT REQUIRED: 1. Eletrical Multimeter 2. E.P.A. Approved Refrigerant
Recovery System 3. Vacuum Pump (capable of 200 microns or less vacuum.) 4.
Acetylene torch. 5. Electronic Halogen Leak Detector capable of detecting HFC
(Hydrofluorocarbon) refrigerants. 6. R410A Refrigerant Manifold 7. 1/4″ Braze-
type Access Ports 8. Pinch Tool 9. Digital Refrigerant Scale 10. Vacuum Gauge
– (0 – 1000 microns) 11. Facilities for flowing nitrogen through refrigeration
tubing during all brazing processes.
EQUIPMENT MUST BE CAPABLE OF: 1. Recovering refrigerant to EPA required
levels. 2. Evacuation from both the high side and low side of the system
simultaneously. 3. Introducing refrigerant charge into high side of the
system. 4. Accurately weighing the refrigerant charge introduced into the
system.
R-410A SEALED SYSTEM REPAIRS
Refrigerant Charging
WARNING
RISK OF ELECTRIC SHOCK Unplug and/or disconnect all electrical power to the
unit before performing inspections, maintenances or service.
Failure to do so could result in electric shock, serious injury or death.
WARNING
HIGH PRESSURE HAZARD Sealed Refrigeration System contains refrigerant and oil
under high pressure.
Proper safety procedures must be followed, and proper protective clothing must
be worn when working with refrigerants.
Failure to follow these procedures could result in serious injury or death.
NOTE: Always weigh in refrigerant based on the model nameplate.
NOTE: Because the refrigerant system is a sealed system, service process tubes
will have to be installed. First install a line tap and remove refrigerant
from system. Make necessary sealed system repairs and vacuum system. Crimp
process tube line and solder end shut. Do not leave a service valve in the
sealed system. Proper refrigerant charge is essential to proper unit
operation. Operating a unit with an improper refrigerant charge will result in
reduced performance (capacity) and/or efficiency. Accordingly, the use of
proper charging methods during servicing will insure that the unit is
functioning as designed and that its compressor will not be damaged.
NOTE:Factory sealed units will not be overcharged Too much refrigerant
(overcharge) in the system is just as bad (if not worse) than not enough
refrigerant (undercharge). they both can be the source of certain compressor
failures if they remain uncorrected for any period of time. Quite often, other
problems (such as low air flow across evaporator, etc.) are misdiagnosed as
refrigerant charge problems. The refrigerant circuit diagnosis chart will
assist you in properly diagnosing the systems. An overcharged unit will return
liquid refrigerant (slugging) back to the suction side of the compressor
eventually causing a mechanical failure within the compressor. This mechanical
failure can manifest itself as valve failure, bearing failure, and/or other
mechanical failure. The specific type of failure will be influenced by the
amount of liquid being returned, and the length of time the slugging
continues. Not enough refrigerant (undercharge) on the other hand, will cause
the temperature of the suction gas to increase to the point where it does not
provide sufficient cooling for the compressor motor. When this occurs, the
motor winding temperature will increase causing the motor to overheat and
possibly cycle open the compressor overload protector. Continued overheating
of the motor windings and/or cycling of the overload will eventually lead to
compressor motor or overload failure.
58
R-410A SEALED SYSTEM REPAIRS
WARNING
RISK OF ELECTRIC SHOCK Unplug and/or disconnect all electrical power to the
unit before performing inspections, maintenances or service.
Failure to do so could result in electric shock, serious injury or death.
Undercharged Refrigerant Systems
NOTE: Ensure fan is on high speed during testing. An undercharged system will
result in poor performance (low pressures, etc.) in both the heating and
cooling cycle.
Whenever you service a unit with an undercharge of refrigerant, always suspect
a leak. The leak must be repaired before charging the unit.
To check for an undercharged system, turn the unit on, allow the compressor to run long enough to establish working pressures in the system (15 to 20 minutes).
WARNING
HIGH PRESSURE HAZARD Sealed Refrigeration System contains refrigerant and oil
under high pressure.
Proper safety procedures must be followed, and proper protective clothing must
be worn when working with refrigerants.
Failure to follow these procedures could result in serious injury or death.
During the cooling cycle you can listen carefully at the exit of the metering device into the evaporator; an intermittent hissing and gurgling sound indicates a low refrigerant charge. Intermittent frosting and thawing of the evaporator is another indication of a low charge, however, frosting and thawing can also be caused by insufficient air over the evaporator or partial restriction in the refrigeration system besides the metering device.. Checks for an undercharged system can be made at the compressor. If the compressor seems quieter than normal, it is an indication of a low refrigerant charge.
If the compressor reads low amperage and has a high discharge line temperature at the compressor, it is an indication of low system refrigerant.
A check of the amperage drawn by the compressor motor should show a lower reading. (Check the Unit Specification.) After the unit has run 10 to 15 minutes, check the gauge pressures. Gauges connected to system with an undercharge will have low head pressures and substantially low suction pressures.
Figure 601 (Undercharged System) 59
R-410A SEALED SYSTEM REPAIRS
WARNING
RISK OF ELECTRIC SHOCK Unplug and/or disconnect all electrical power to the
unit before performing inspections, maintenances or service.
Failure to do so could result in electric shock, serious injury or death.
Overcharged Refrigerant Systems
NOTE: Ensure fan is on high speed during testing. NOTE: A unit sealed from the
factory will not be overcharged.
Whenever an overcharged system is indicated, always make sure that the problem
is not caused by air flow problems. Improper air flow over the evaporator coil
may indicate some of the same symptoms as an over charged system.
NOTE:Factory sealed units will not be overcharged
WARNING
HIGH PRESSURE HAZARD Sealed Refrigeration System contains refrigerant and oil
under high pressure.
Proper safety procedures must be followed, and proper protective clothing must
be worn when working with refrigerants.
Failure to follow these procedures could result in serious injury or death.
An overcharge can cause the compressor to fail, since it would be “slugged” with liquid refrigerant. The charge for any system is critical. When the compressor is noisy, suspect an overcharge, when you are sure that the air quantity over the evaporator coil is correct. Icing of the evaporator will not be encountered because the refrigerant will boil later if at all. Gauges connected to system will usually have higher head pressure (depending upon amount of over charge). Suction pressure should be slightly higher. Compressor amps will be near normal or higher. Noncondensables can also cause these symptoms. To confirm, reclaim some of the charge, if conditions improve, system may be overcharged. If conditions don’t improve, Noncondensables are indicated.
Figure 602 (Overcharged System) 60
R-410A SEALED SYSTEM REPAIRS
Restricted Refrigerant System
NOTE: Ensure fan is on high speed during testing. Troubleshooting a restricted
refrigerant system can be difficult. The following procedures are the more
common problems and solutions to these problems. There are two types of
refrigerant restrictions: Partial restrictions and complete restrictions. A
partial restriction allows some of the refrigerant to circulate through the
system. With a complete restriction there is no circulation of refrigerant in
the system. Restricted refrigerant systems display the same symptoms as a
“low-charge condition.” A quick check for either condition begins at the
evaporator. With a partial restriction, there may be gurgling sounds at the
metering device entrance to the evaporator. The evaporator in a partial
restriction could be partially frosted or have an ice ball close to the
entrance of the metering device. Frost may continue on the suction line back
to the compressor. Often a partial restriction of any type can be found by
feel, as there is a temperature difference from one side of the restriction to
the other. There will ususally be a diiference felt at the capillary tube.
This does not indicate a restricted condition. With a complete restriction,
there will be no sound at the metering device entrance. An amperage check of
the compressor with a partial restriction may show normal current when
compared to the unit specification. With a complete restriction the current
drawn may be considerably less than normal, as the compressor is running in a
deep vacuum (no load.) Much of the area of the condenser will be relatively
cool since most or all of the liquid refrigerant will be stored there. Make
all checks posible before tapping into the system and installing gauges. When
the unit is shut off, or the compressor disengages, the gauges may equalize
very slowly. The following conditions are based primarily on a system in the
cooling mode.
Figure 603 (Restricted System) 61
R-410A SEALED SYSTEM REPAIRS
Sealed System Method of Charging/ Repairs
WARNING
BURN HAZARD Proper safety procedures must be followed, and proper protective
clothing must be worn when working with a torch.
Failure to follow these procedures could result in moderate or serious injury.
CAUTION
FREEZE HAZARD Proper safety procedures must be followed, and proper protective
clothing must be worn when working with liquid refrigerant.
Failure to follow these procedures could result in minor to moderate injury.
The refrigerant cycle is critically charged. The only acceptable method for charging the sealed system is the Weighed in Charge Method. The weighed in method should always be used whenever a charge is removed from a unit such as for a leak repair, compressor replacement, or when there is no refrigerant charge left in the unit. To charge by this method, requires the following steps: 1. Install a piercing valve to remove refrigerant from the sealed system. (Piercing valve must be removed from the system before recharging.) 2. Recover Refrigerant in accordance with EPA regulations. 3. Install a process tube to sealed system. 4. Make necessary repairs to system. 5. Evacuate the system to 1500 microns 6. Repressurize to 50 PSI with nitrogen 7. Evacuate the system to 1000 microns 8. Repressurize to 50 PSI with nitrogen 9. Evacuate the system to below 500 microns 10. Weigh in the refrigerant charge with the property quantity of R-410A refrigerant per model nameplate. 11. Start unit, and verify performance. 12. Crimp the process tube and solder the end shut.
62
R-410A SEALED SYSTEM REPAIRS
Compressor Replacement
WARNING
ELECTRIC SHOCK HAZARD Turn off electric power before service or installation.
Extreme care must be used, if it becomes necessary to work on equipment with
power applied.
Failure to do so could result in serious injury or death.
WARNING
HIGH PRESSURE HAZARD Sealed Refrigeration System contains refrigerant and oil
under high pressure.
Proper safety procedures must be followed, and proper protective clothing must
be worn when working with refrigerants.
Failure to follow these procedures could result in serious injury or death.
1. Be certain to perform all necessary electrical and refrigeration tests to
be sure the compressor is actually defective before replacing. 2. Recover all
refrigerant from the system though the process tubes. PROPER HANDLING OF
RECOVERED REFRIGERANT ACCORDING TO EPA REGULATIONS IS REQUIRED. Do not use
gauge manifold for this purpose if there has been a burnout. You will
contaminate your manifold and hoses. Use a Schrader valve adapter and copper
tubing for burnout failures. 3.After all refrigerant has been recovered,
disconnect suction and discharge lines from the compressor and remove
compressor. Be certain to have both suction and discharge process tubes open
to atmosphere. 4.Carefully pour a small amount of oil from the suction stub of
the defective compressor into a clean container. 5.Using an acid test kit (one
shot or conventional kit), test the oil for acid content according to the
instructions with the kit. 6.If any evidence of a burnout is found, no matter
how slight, the system will need to be cleaned up following proper procedures.
7.Install the replacement compressor.
CAUTION: While the unit is being evacuated, seal all openings on the defective
compressor. Compressor manufacturers will void warranties on units received
not properly sealed. Do not distort the manufacturers tube connections.
WARNING
EXPLOSION HAZARD The use of nitrogen requires a pressure regulator. Follow all
safety procedures and wear protective safety clothing etc.
Failure to follow proper safety procedures could result in serious injury or
death.
CAUTION
FREEZE HAZARD Proper safety procedures must be followed, and proper protective
clothing must be worn when working with liquid refrigerant.
Failure to follow these procedures could result in minor to moderate injury.
WARNING
NEVER, under any circumstances, liquid charge a rotary-compressor through the
LOW side. Doing so would cause permanent damage to the new compressor. Use a
charging adapter.
8. Pressurize with trace amounts of R-410A and nitrogen to 550 psi and leak
test all connections with a leak detector.Repair any leaks found. 8a. If leak
detector is unavailable remove all refrigerant from system and pressurize with
nitrogen to 550 psi. Check that system holds pressure. Repeat Step 8 to ensure
no more leaks are present 9. Evacuate the system with a good vacuum pump
capable of a final vacuum of 300 microns or less. The system should be
evacuated through both liquid line and suction line gauge ports.
9a.Evacuate the system to 1500 microns. 9b. Repressurize to 50 PSI with
nitrogen. 9c. Evacuate the system to 1000 microns. 9d. Repressurize to 50 PSI
with nitrogen. 9e. Evacuate the system to below 500 microns.
10. Weigh in the refrigerant charge with the proper quantity of R-410A
refrigerant using digital scale per model nameplate. 11.Start unit, and verify
performance. 12. Crimp the process tube and solder the end shut.
63
R-410A SEALED SYSTEM REPAIRS
Compressor Replacement -Special Procedure in Case of Compressor Burnout
1. Recover all refrigerant and oil from the system. 2. Remove compressor,
capillary tube and filter drier from the system.
WARNING
HIGH PRESSURE HAZARD Sealed Refrigeration System contains refrigerant and oil
under high pressure.
Proper safety procedures must be followed, and proper protective clothing must
be worn when working with refrigerants.
Failure to follow these procedures could result in serious injury or death.
WARNING
ELECTRIC SHOCK HAZARD Turn off electric power before service or installation.
Extreme care must be used, if it becomes necessary to work on equipment with
power applied.
Failure to do so could result in serious injury or death.
WARNING
EXPLOSION HAZARD The use of nitrogen requires a pressure regulator. Follow all
safety procedures and wear protective safety clothing etc.
Failure to follow proper safety procedures could result in serious injury or
death.
WARNING
NEVER, under any circumstances, liquid charge a rotary-compressor through the
LOW side. Doing so would cause permanent damage to the new compressor. Use a
charging adapter.
3. Flush evaporator condenser and all connecting tubing with dry nitrogen or
equivalent. Use approved flushing agent to remove all contamination from
system. Inspect suction and discharge line for carbon deposits. Remove and
clean if necessary. Ensure all acid is neutralized. 4. Reassemble the system,
including new drier strainer and capillary tube. 5. Pressurize with trace
amounts of R-410A and nitrogen to 550 psi and leak test all connections with a
leak detector. Repair any leaks found. 5a. If leak detector is unavailable
remove all refrigerant from system and pressurize with nitrogen to 550 psi.
Check that system holds pressure. Repeat Step 5 to insure no more leaks are
present. NOTE: While the unit is being evacuated, seal all openings on the
defective compressor. Compressor manufacturers will void warranties on units
received not properly sealed. Do not distort the manufacturers tube
connections. 9. Evacuate the system with a good vacuum pump capable of a final
vacuum of 300 microns or less. The system should be evacuated through both
liquid line and suction line gauge ports.
9a.Evacuate the system to 1500 microns. 9b. Repressurize to 50 PSI with
nitrogen. 9c. Evacuate the system to 1000 microns. 9d. Repressurize to 50 PSI
with nitrogen. 9e. Evacuate the system to below 500 microns. 7. Recharge the
system with the correct amount of refrigerant. The proper refrigerant charge
will be found on the unit rating plate. The use of an accurate measuring
device, such as a charging cylinder, electronic scales or similar device is
necessary.
64
R-410A SEALED SYSTEM REPAIRS
Replace The Reversing Valve
WARNING
HIGH PRESSURE HAZARD Sealed Refrigeration System contains refrigerant and oil
under high pressure.
Proper safety procedures must be followed, and proper protective clothing must
be worn when working with refrigerants.
Failure to follow these procedures could result in serious injury or death.
NOTICE
FIRE HAZARD The use of a torch requires extreme care and proper judgment.
Follow all safety recommended precautions and
notice could result in moderate to serious property damage.
1. Install Process Tubes. Recover refrigerant from sealed system. PROPER
HANDLING OF RECOVERED REFRIGERANT ACCORDING TO EPA REGULATIONS IS REQUIRED. 2.
Remove solenoid coil from reversing valve. If coil is to be reused, remove
solenoid and protect from heat while changing valve. 3. Unbraze all lines from
reversing valve. 4. Clean all excess braze from all tubing so that they will
slip into fittings on new valve. 5. Remove solenoid coil from new valve. 6.
Protect new valve body from heat while brazing with plastic heat sink (Thermo
Trap) or wrap valve body with wet rag. 7. Fit all lines into new valve and
braze lines into new valve.
WARNING
EXPLOSION HAZARD The use of nitrogen requires a pressure regulator. Follow all
safety procedures and wear protective safety clothing etc.
Failure to follow proper safety procedures could result in serious injury or
death.
8. Pressurize sealed system with trace amounts of R-410A and nitrogen up to
550 psi. Perform Triple evacuation and leak processes, using a suitable leak
detector according to HVAC industry standards. 9. Once the sealed system is
leak free, install solenoid coil on new valve and charge the sealed system by
weighing in the proper amount and type of refrigerant as shown on rating
plate. Crimp the process tubes and solder the ends shut. Do not leave Schrader
or piercing valves in the sealed system.
NOTE: When brazing a reversing valve into the system, it is of extreme
importance that the temperature of the valve does not exceed 250°F at any
time. Wrap the reversing valve with a large rag saturated with water. “Re-wet”
the rag and thoroughly cool the valve after each brazing operation of the four
joints involved. The wet rag around the reversing valve will eliminate
conduction of heat to the valve body when brazing the line connection.
65
9-12K 208/230V
S
66
WIRING DIAGRAMS
WASHER TEMINAL COVER
GASKET
NUT
TERMINAL DETAIL
COMPRESSOR C “F”
HARNESS COMPRESSOR
R
WIRING DIAGRAM COOL, ELECTRIC HEAT, HEAT PUMP
SMALL CHASSIS, 230/208V HEATERS: 2.5KW, 3.4KW, 5.0KW
SERVICE DISPLAY
BLUE
RED BLACK
CIRCUIT BREAKER
WHITE
L1 L2
QUICK DISCONNECT
COIL SOLENOID
WHITE
CAPACITOR C
WHITE
HERM BLACK
GREEN
TO MOTOR MOUNT
BLOWER MOTOR
BLUE
RED
BLUE BLUE
BLACK (TO L1)
VOLTAGE SELECTION SWITCH SET VOLTAGE TO 230V
ORANGE
RED
HEATER 2.5 KW & 3.4 KW
5.0 KW
AMBIENT AIR SENSOR
Figure 801
WHITE 520 (TO L2)
COMP RELAY
HEAT RELAY
VOLTAGE SWITCH
HEAT RELAY
FAN 1 FAN 2 FAN 3 FAN 4 RV RELAY RELAY RELAY RELAY RELAY
LEGEND
PART NO.
REV
92160304
01
LEGEND FOR TSTAT WIRING HARNESS
R 24VAC Power From Unit
Y Call for Cooling
W Call for Heating
L1
B Reversing valve Energized in heating mode
GL Call for Low Fan
GH Call for High Fan
C COMMON
L2 or ACN
ELECTRONIC CONTROL
OUTDOOR COIL SENSOR INDOOR COIL SENSOR
9-12K 265V
S
67
WIRING DIAGRAMS
BLACK
BROWN
A
RED
WASHER TEMINAL COVER
GASKET
NUT
TERMINAL DETAIL BLACK
WHITE
FUSE
A
FUSE
FUSE
FUSE BLOCK
TRANSFORMER
COMPRESSOR
R
C “F”
HARNESS COMPRESSOR
WIRING DIAGRAM COOL, ELECTRIC HEAT, HEAT PUMP
SMALL CHASSIS, 265V HEATERS: 2.5KW, 3.4KW, 5.0KW
BLUE
RED BLACK
CIRCUIT BREAKER
WHITE
CAPACITOR C
WHITE
QUICK DISCONNECT
BLACK
HERM
SERVICE DISPLAY
GREEN
TO MOTOR MOUNT
MOTOR
L1 RED
L2
BLACK
RED
ORANGE
RED
BLUE
BUILDING GROUND
GROUND TO CHASIS
BLACK
A
RELAY
HEATER 2.5 KW & 3.4 KW
5.0 KW
AMBIENT AIR SENSOR
ELECTRONIC CONTROL (REAR VIEW)
VOLTAGE SELECTION SWITCH SET VOLTAGE TO 230V
Figure 802
BLUE BLUE
BLACK
WHITE
COIL SOLENOID
265V 60Hz 2Ø 2 WIRES FLA MCA MOP
COMP RELAY
HEAT RELAY
VOLTAGE SWITCH
HEAT RELAY
FAN 1 FAN 2 FAN 3 FAN 4 RV RELAY RELAY RELAY RELAY RELAY
INDOOR COIL SENSOR
JUMPER WIRE
LEGEND
PART NO.
REV
92160305
01
LEGEND FOR TSTAT WIRING HARNESS
TRANSFORMER L1
R 24VAC Power From Unit Y Call for Cooling W Call for Heating B Reversing valve Energized in heating mode GL Call for Low Fan GH Call for High Fan C COMMON
L2 or ACN
OUTDOOR COIL SENSOR
ELECTRONIC CONTROL
WHITE WHITE
WIRING DIAGRAMS
18K 208/230V (2.5KW, 3.5KW, 5KW)
S
Figure 803 68
COMPRESSOR
C “F”
R
WHITE
CIRCUIT BREAKER
- RED
C
BLUE
CAPACITOR
BLACK
HERM
WHITE
HARNESS COMPRESSOR
WHITE
TO MOTOR MOUNT
GREEN
WHITE BLACK
OUTDOOR FAN MOTOR
COMPRESSOR CONTACTOR
BLACK
BLAC K
(TO L1)
QUICK DISCONNECT
BLACK RED
BLUE
WHITE
W H IT E
VOLTAGE SELECTION SWITCH SET VOLTAGE TO 230V
W H IT E
(TO L2)
RED 540
**
BLACK
x2
COIL SOLENOID
RED BROWN
COMP RELAY
HEAT RELAY
HEAT RELAY
FAN 1 FAN 2 FAN 3 FAN 4 RV RELAY RELAY RELAY RELAY RELAY
-
- L1
**
L2 or ACN
INDOOR COIL SENSOR 4770D SEQ 104
OUTDOOR COIL SENSOR 4770D SEQ 105
ELECTRONIC CONTROL
ORANGE
ORANGE
01
1
PRESSURE SWITCH
INDOOR BLOWER MOTOR
GREEN
TO MOTOR MOUNT
HEATER 2.5 KW & 3.5 KW
5.0 KW
DISPLAY SERVICE
1
TO DISPLAY AMBIENT AIR SENSOR (POU 4770D SEQ 103)
WIRING DIAGRAMS
18K 265V (2.5KW, 3.5KW, 5.0KW)
S
Figure 804 69
BLAC K RED
BLAC K W H IT E
WIRING DIAGRAM COOL, HEAT PUMP, EH, 265V
2.5, 3.4, 5.0 KW LARGE CHASSIS QUICK DISCONNECT
FUSE HOLDER
FUSE FUSE
BRO WN BLAC K W H IT E
HARNESS COMPRESSOR
C “F”
R
WHITE
- CAPACITOR
C
CIRCUIT BREAKER
- RED
BLUE
HERM
BLACK BLACK
COMPRESSOR
WHITE
GREEN
TO MOTOR MOUNT
COMPRESSOR CONTACTOR
HEATER RELAY
4770
OUTDOOR FAN MOTOR
RED
BROWN RED
TRANSFORMER IN= 265V OUT= 230V
BLACK
RED
BLACK
**
BLACK RED
BLUE
W H IT E W HITE BLAC K
COMP RELAY
HEAT RELAY
HEAT RELAY
FAN 1 FAN 2 FAN 3 FAN 4 RV RELAY RELAY RELAY RELAY RELAY
WHITE
**
- INDOOR COIL SENSOR
OUTDOOR COIL SENSOR
ELECTRONIC CONTROL
WHITE
INDOOR BLOWER MOTOR
HEATER 2.5 KW & 3.5 KW
5.0 KW
PRESSURE SWITCH
BLACK BLACK
COIL SOLENOID
O RANG E O RANG E
01
VOLTAGE SELECTION SWITCH SET VOLTAGE TO 230V
L
SERVICE DISPLAY
GREEN TO MOTOR MOUNT
AMBIENT AIR SENSOR
18K 208/230V (7.5KW)
R
BLACK
HERM
S
Figure 805 70
WIRING DIAGRAMS
WASHER TEMINAL COVER
GASKET
NUT
TERMINAL DETAIL
BLACK BLACK
HARNESS COMPRESSOR
COMPRESSOR
C “F”
WIRING DIAGRAM
COOL, ELECTRIC HEAT, HEAT PUMP
LARGE CHASSIS, 230/208V
HEATERS: 7.5KW
RED
CIRCUIT BREAKER
WHITE
BLUE
CAPACITOR
COMPRESSOR CONTACTOR
TO MOTOR GREEN MOUNT
OUTDOOR FAN MOTOR
WHITE
BLACK
QUICK DISCONNECT
L1
L2
BLACK
WHITE
COIL SOLENOID
WHITE C
RED BLUE
SERVICE DISPLAY
GREEN
INDOOR BLOWER MOTOR
TO MOTOR MOUNT
VOLTAGE SELECTION SWITCH SET VOLTAGE TO 230V
RED
WHITE BLACK (TO L1)
BLACK WHITE
HEATER DOUBLE POLE CONTACTOR
RED
BROWN BROWN RED RED
HEATER 7.5 KW
AMBIENT AIR SENSOR
WHITE 520 (TO L2)
COMP RELAY
HEAT RELAY
HEAT RELAY
FAN 1 FAN 2 FAN 3 FAN 4 RV RELAY RELAY RELAY RELAY RELAY
PRESSURE SWITCH
VOLTAGE SWITCH
L1
L2 or ACN
ELECTRONIC CONTROL
OUTDOOR COIL SENSOR INDOOR COIL SENSOR
LEGEND
PART NO.
REV
92160515
02
LEGEND FOR TSTAT WIRING HARNESS
R 24VAC Power From Unit Y Call for Cooling W Call for Heating B Reversing valve Energized in heating mode GL Call for Low Fan GH Call for High Fan
18K 265V (7.5KW)
HERM C
Figure 806 71
WIRING DIAGRAMS
265V 60Hz 2Ø 2 WIRES FLA MCA MOP
BUILDING GROUND
QUICK DISCONNECT
WHITE
BLACK
BLAC K WHITE
VOLTAGE SELECTION SWITCH SET VOLTAGE TO 230V
FUSE BLOCK
230V
FUSE
FUSE
FUSE
TRANSFORMER
SERVICE DISPLAY
BLACK
WHITE WHITE BLACK
BLAC K A
RED A A
BROWN
COMPRESSOR S
R
HARNESS COMP
BLAC K
CIRCUIT BREAKER
RED
COMPRESSOR CONTACTOR
RED
WHITE
BLUE
CAPACITOR
WASHER TEMINAL COVER
NUT
WIRING DIAGRAM COOL, ELECTRIC HEAT, HEAT PUMP
GASKET
C
LARGE CHASSIS, 265V
HEATER: 7.5 KW
WHITE
TERMINAL DETAIL
HEATER DOUBLE POLE CONTACTOR
RED
BLACK
BROWN BROWN
ORANGE
ORANGE
WHITE BLACK
HEATER 7.5 KW
BLACK RED BLUE
COIL SOLENOID
TO MOTOR MOUNT
GREEN
OUTDOOR FAN
MOTOR
INDOOR BLOWER MOTOR
GREEN
TO MOTOR MOUNT
COMP RELAY
HEAT RELAY
VOLTAGE SWITCH
HEAT RELAY
FAN 1 FAN 2 FAN 3 FAN 4 RV RELAY RELAY RELAY RELAY RELAY
TRANSFORMER
AMBIENT AIR SENSOR
ELECTRONIC CONTROL (REAR VIEW)
WHITE
ELECTRONIC CONTROL (FRONT PANEL)
PRESSURE SWITCH
LEGEND
PART NO.
REV
92160516
02
LEGEND FOR TSTAT WIRING HARNESS
R 24VAC Power From Unit Y Call for Cooling W Call for Heating B Reversing valve Energized in heating mode GL Call for Low Fan GH Call for High Fan C COMMON
WIRING DIAGRAMS
24K 208/230V (2.5KW, 3.5KW, 5KW)
S
Figure 807 72
WIRING DIAGRAM COOL, HEAT PUMP, EH, 230V
2.5, 3.4, 5.0 KW LARGE CHASSIS QUICK DISCONNECT
WHITE
HARNESS COMPRESSOR
C “F”
HERM
R
WHITE CAPACITOR
C
CIRCUIT BREAKER
- RED
BLUE
BLACK BLACK
COMPRESSOR
WHITE
GREEN
TO MOTOR MOUNT
OUTDOOR FAN MOTOR
INDOOR BLOWER MOTOR
SERVICE DISPLAY
W H IT E W HITE
BLACK 5
BLACK
COMPRESSOR CONTACTOR
RED
**
COMP RELAY
HEAT RELAY
HEAT RELAY
ORANGE ORANGE
HEATER 2.5 KW – 5.0 KW
**
BLACK RED BLUE
FAN 1 FAN 2 FAN 3 FAN 4 RV RELAY RELAY RELAY RELAY RELAY
PRESSURE SWITCH
WHITE
GREEN
TO BLOWER FRONT
CONTROL BLOWER
BLACK BLACK
COIL SOLENOID
**
- IND OOR COIL SENSOR
OUTDOOR COIL SENSOR
ELECTRONIC CONTROL
VOLTAGE SELECTION SWITCH SET VOLTAGE TO 230V
AMBIENT AIR SENSOR
WIRING DIAGRAMS
24K 208/230V (7.5KW AND 10KW)
S
Figure 808 73
W H IT E W HITE BLAC K
WIRING DIAGRAM COOL, HEAT PUMP, EH, 230V
7.5KW, 10.0 KW LARGE CHASSIS QUICK DISCONNECT
WHITE
BLACK
BLAC K W H IT E BLAC K W H IT E
HERM
R
HARNESS COMPRESSOR
C “F”
WHITE CAPACITOR
C
CIRCUIT BREAKER
- RED
BLUE
BLACK BLACK
COMPRESSOR
WHITE
Lorem ipsum
GREEN TO MOTOR
MOUNT
OUTDOOR FAN MOTOR
INDOOR BLOWER MOTOR
COMPRESSOR CONTACTOR
HEATER RELAY
**
BLACK WHITE
BLACK RED
RED
RED
RED
ORANGE
ORANGE BLACK RED BLUE
**
**
COMP RELAY
HEAT RELAY
HEAT RELAY
FAN 1 FAN 2 FAN 3 FAN 4 RV RELAY RELAY RELAY RELAY RELAY
HEATER 7.5 KW & 10.0 KW
PRESSURE SWITCH
WHITE
GREEN
TO BLOWER FRONT
CONTROL
BLOWER
01
BLACK BLACK
COIL SOLENOID
**
- IND OOR COIL SENSOR
OUTDOOR COIL SENSOR
ELECTRONIC CONTROL
VOLTAGE SELECTION SWITCH SET VOLTAGE TO 230V
SERVICE DISPLAY
AMBIENT AIR SENSOR
WIRING DIAGRAMS
24K 265V (2.5KW, 3.5KW, 5KW)
S
Figure 807 (80126406) 74
BLAC K 5
W H IT E
WIRING DIAGRAM COOL, HEAT PUMP, EH, 265V
2.5, 3.4, 5.0 KW LARGE CHASSIS QUICK DISCONNECT
FUSE HOLDER
FUSE FUSE
HARNESS COMPRESSOR
C “F”
HERM
R
WHITE CAPACITOR
C
CIRCUIT BREAKER
- RED
BLUE
BLACK BLACK
COMPRESSOR
WHITE
GREEN
TO MOTOR MOUNT
OUTDOOR FAN MOTOR
INDOOR BLOWER MOTOR
BLAC K RED BR O WN BLAC K W H IT E
TRANSFORMER IN= 265V OUT= 230V (RE OP 40 183)
W H IT E W HITE BLAC K
COMPRESSOR CONTACTOR
BLACK
**
BLACK
RED
RED
ORANGE
ORANGE BLACK RED BLUE
**
**
COMP RELAY
HEAT RELAY
HEAT RELAY
FAN 1 FAN 2 FAN 3 FAN 4 RV RELAY RELAY RELAY RELAY RELAY
HEATER 2.5 KW & 5.0 KW
PRESSURE SWITCH
WHITE
GREEN
TO BLOWER FRONT
CONTROL BLOWER
BLACK BLACK
COIL SOLENOID
WHITE
- IND OOR COIL SENSOR
OUTDOOR COIL SENSOR
ELECTRONIC CONTROL
VOLTAGE SELECTION SWITCH SET VOLTAGE TO 230V
SERVICE DISPLAY
AMBIENT AIR SENSOR REL OP 40 SEQ 103
S
Figure 808 (80126404) 75
W H IT E W HITE BLAC K
BLAC K W H IT E
WIRING DIAGRAM COOL, HEAT PUMP, EH, 265V
7.5 KW, 10.0 KW LARGE CHASSIS QUICK DISCONNECT
FUSE HOLDER
FUSE FUSE
WHITE CAPACITOR
C
BLAC K RED BR O WN BLAC K W H IT E BLAC K W H IT E
TRANSFORMER IN= 265V OUT= 230V
COMPRESSOR CONTACTOR
BLACK
HERM
HARNESS COMPRESSOR
C “F”
R
CIRCUIT BREAKER
- RED
BLUE
BLACK BLACK
COMPRESSOR
WHITE
GREEN
TO MOTOR MOUNT
OUTDOOR FAN MOTOR
INDOOR BLOWER MOTOR
HEATER RELAY
**
BLACK WHITE
BLACK
RED
RED
RED
RED
ORANGE
ORANGE BLACK RED BLUE
**
**
COMP RELAY
HEAT RELAY
HEAT RELAY
FAN 1 FAN 2 FAN 3 FAN 4 RV RELAY RELAY RELAY RELAY RELAY
HEATER 7.5 KW & 10.0 KW
PRESSURE SWITCH
WHITE
GREEN
TO BLOWER FRONT
CONTROL
BLOWER
01
BLACK BLACK
COIL SOLENOID
WHITE
**
- IND OOR COIL SENSOR
OUTDOOR COIL SENSOR
ELECTRONIC CONTROL
VOLTAGE SELECTION SWITCH SET VOLTAGE TO 230V
SERVICE DISPLAY
AMBIENT AIR SENSOR
24K 265V (7.5KW and 10KW)
WIRING DIAGRAMS
INTERACTIVE PARTS VIEWER
All Friedrich Service Parts can be found on our online interactive parts
viewer. Please click on the link below: Interactive Parts Viewer For Further
Assistence contact Friedrich customer service at
(1-800-541-6645).
76
AVAILABLE ACCESSORIES
ACCESSORIES
ARCHITECTURAL LOUVER VPAL2 and VPSC2 Extruded aluminum grille that attaches to
the outdoor section of the wall plenum. VPSC2 can be ordered in custom colors.
DIMENSIONS: 25 9/16″ W x 31 1/16″ H
WALL PLENUM (Required) VPAWP1-8, VPAWP1-14 Two-part sleeve that telescopes in
and out; sits inside the exterior wall penetration.
VPAWP1-8 telescopes from 5 1/2″ 8″ VPAWP1-14 telescopes from 8″ 14″
DIMENSIONS : 24 1/8″ W x 30 3/8″ H CUTOUT DIMENSIONS: 24 5/8″ W x 30 7/8″ H
VPAL2
RETURN AIR GRILLE/ ACCESS PANEL/SOLID DOOR ACCESS PANEL VPRG4/ VPRG4R/VPRG4SD
be mounted with return air openings high or low on the door for optimum sound
attenuation. VPRG4SD is a solid door panel. VPRG4 is a default left in-swing,
the VPRG4R is a right in-swing.
DIMENSIONS: 29″ W x 58″ H CUTOUT DIMENSIONS: 27″ W x 55 3/4″ H
FIRST COMPANY SLEEVE ADAPTER
VPASA1 ® SPXR-
series single package vertical unit wall sleeve and louver. Easily connects to
Friedrich chassis. Only compatible with Friedrich’s smaller sized VPAK 9k and
12k units.
SINGLE STAGE THERMOSTATS
RT7P Wired, single stage, wall-mounted programmable thermostat with two fan
speeds and backlight. Controls Friedrich VERT-I-PAK.
RT7 Wired, single stage, wall-mounted digital thermostat with two fan speeds
and backlight. Controls Friedrich VERT-I-PAK.
WRT2 Wireless, single stage, wall-mounted programmable thermostat with two fan
speeds and backlight. Controls Friedrich VERT-I-PAK.
ENERGY MANAGEMENT THERMOSTATS
EMRT2/EMWRT2 Wired/Wirelss thermostat with occupancy sensor.
EMOCT
EMRAF
Online connection kit. Remote access fee
References
- Friedrich Air Conditioning
- Room Air Conditioning Expert-Premium AC | Friedrich Air Conditioning
- Room Air Conditioning Expert-Premium AC | Friedrich Air Conditioning
- Total Home Supply Store: Heating & Cooling - HVAC Systems