FRIEDRICH PDE07K3SGR3 Packaged Terminal Air Conditioner User Manual

: August 19, 2024
: FRIEDRICH

Table of Contents

FRIEDRICH PDE07K3SGR3 Packaged Terminal Air Conditioner
Specifications
Installation and Repair
Maintenance
Troubleshooting
FAQs
INTRODUCTION
SPECIFICATIONS
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

FRIEDRICH PDE07K3SGR3 Packaged Terminal Air Conditioner

Specifications

Models: PDE07K3SGR3, PDE09K3SGR3, PDE12K3SGR3, PDE15K5SGR3 (230 Volt), PDE07R3SGR3, PDE09K3SGR3, PDE12R3SGR3, PDE15R5SGR3 (265 Volt)
Operation: PTAC With Electric Heat and PTAC With Heat Pump

Installation and Repair

The product is to be installed and repaired by a qualified technician who is familiar with safety procedures and equipped with the necessary tools.

Installation: Follow the installation instructions provided in the manual for proper setup.
Repairs: Only qualified technicians should handle repairs to avoid hazards and ensure safety.

Maintenance

Proper maintenance is essential for safe operation and longevity of the product.

Owner’s Responsibility: Owners are responsible for regular maintenance to prevent personal injury and property damage.
Routine Maintenance: Refer to the Routine Maintenance section in the manual for guidelines on upkeep.

Troubleshooting

If issues arise, refer to the Troubleshooting section in the manual for guidance on identifying and resolving common problems.

FAQs

Q: Who should perform installation and repairs?
A: Installation and repairs should only becarried out by qualified technicians with proper training and toolsto ensure safety.

Q: What should owners do for maintenance?
A: Owners are responsible for regular maintenance as outlined in the manual to prevent injuries and equipment damage.

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.

Maintenance is the responsibility of the owner. Failure to properly maintain or repair equipment may result in personal injury and/or various types of property damage (fire, flood, etc.).

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. 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/Operation manual which can be acquired on the Friedrich website. Click the Link or scan the QR code to be directed to the Professional page where you can locate our technical literature.

SAFETY IS 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 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. 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 Indicates a hazard which, if not avoided, can result in personal injury and damage to product or other property. NOTICE Indicates property damage can occur if instructions are not followed.
This symbol indicates that this appliance uses a flammable refrigerant. If the refrigerant is leaked and is exposed to an external ignition source, there is a risk of fire.
This symbol indicates that the Operation Manual should be read carefully.
This symbol indicates that service personnel should be handling this equipment with reference to the installation manual.
This symbol indicates that information is available such as the Installation and Operation manual, or the Service Manual.
3

INTRODUCTION

WARNING: The manufacturer’s warranty does not cover any damage or defect to the air conditioner caused by the attachment
or use of any components, accessories or devices (other than those authorized by the manufacturer) into, onto or in conjunction with the air conditioner. You should be aware that the use of unauthorized components, accessories or devices may adversely affect the operation of the air conditioner and may also endanger life and property. The manufacturer disclaims any responsibility for such loss or injury resulting from the use of such unauthorized components, accessories or devices.
WARNING: This appliance is not intended for use by persons (Including children) with reduced physical, sensory or mental
capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety. Children should be supervised to ensure that they do not play with the appliance.
WARNING: The maximum altitude for this appliance is 2,000 meters(6,562 feet).
Do not use above 2,000 meters(6,562 feet).

WARNING: Electrical Shock Hazard
Disconnect all power to the unit before starting maintenance. All electrical connections and wiring MUST be installed by a qualified electrician and conform to the National Code and all local codes which have jurisdiction. Failure to do so can result in property damage, severe electrical shock or death.

WARNING: Read Installation Manual
Read this manual thoroughly prior to equipment installation or operation. It is the installer’s responsibility to properly apply and install the equipment. Installation must be in conformance with the NFPA 70-2023 national electric code or current edition, International Mechanic code 2021 or current edition, and any other local or national codes.

WARNING: Safety First
Do not remove, disable, or bypass this unit’s safety devices. Doing so may cause fire, injuries, or death.

WARNING: This Product uses R-32 Refrigerant
Do not use means to accelerate the defrosting process or to clean, other than those recommended by the manufacturer.
The appliance shall be stored in a room without continuously operating ignition sources (for example: open flames, an operating gas appliance or an operating electric heater.
Do not pierce or burn.
Be aware that refrigerants may not contain an odor.

Refrigerant Safety Group
A2L

WARNING: Refrigeration System under High pressure
Do not puncture, heat, expose to flame or incinerate. Only certified refrigeration technicians should service this equipment. R32 systems operate at higher pressures than R22 equipment. Appropriate safe service and handling practices must be used.
CAUTION: Do Not Operate Equipment During Active Stages Of Construction
To ensure proper operation, Friedrich requires that all equipment is not operated during active construction phases. This includes active stages of completing framing, drywalling, spackling, sanding, painting, flooring, and moulding in the equipment’s designated conditioning space. The use of this equipment during construction could result in premature failure of the components and/or system and is in violation of our standard warranty guidelines. The operation of newly installed equipment during construction will accelerate the commencement and/or termination of the warranty period.
WARNING: Keep all air circulation and ventilation openings free from obstruction.
WARNING: The unit should not be in contact with any equipment that will transmit vibration to the unit. Any excessive vibration or
pulsation to the unit could result in damage to the refrigerant tubing.

SPECIFICATIONS

· 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.

·

Connect to a properly grounded outlet only.

·

Do not remove ground prong of plug.

·

Do not cut or modify the power supply cord.

·

Do not use extension cords with the unit.

·

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.

OPERATION
Refrigerant System Diagram
(1)Cooling + Heat Pump + Auxiliary Electric Heater

P: PTAC

Approximate

Heater Size:

D: Digital

Cooling

2: 2.5Kw

H/E: HP or Cool only

BTU/HR

3: 3.5Kw 5: 5Kw

R32

Hidden Character
PDH 09 K 3 SG R3 – A

Voltage K: 230/208 R: 265V

Series

Serial Number Reference Guide
17 12 M 00001

Minor Engineering Revision

YEAR OF MANUFACTURE 22 = 2022 23 = 2023 24 = 2024 25 = 2025
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

7

SPECIFICATIONS

PTAC W/ Electric Heat 7000-9000 BTU

Model

—

PDE07K3SGR3

PDE07R3SGR3

PDE09K3SGR3

Rated Voltage

V

230/208

265

230/208

Rated Frequency

Hz

60

Phases

—

1

Cooling Capacity

W

2168/2110

2198

2990/2900

Cooling Capacity

Btu/h

7400/7200

7500

10200/9900

Cooling Power Input

W

560/540

560

810/790

Electric Heating Power Input

W 3450/2830, 2450/2010

3450/2450

5000/4090, 3450/2830,2 450/2010

Cooling Current Input

A

2.4/2.6

2.1

3.6/3.9

Electric Heating Current Input

A

15.0/13.6,10.7/9.7

13.1/9.3

21.8/19.7,15.0/ 13.6,10.7/9.7

Rated Input

W

680 3500/2860, 2500/2040

745 3500/2500

11905050/4130,3500/2860,2500/2 040

Rated Current

A 3.3A: 15.2/13.8,10.9/9.8

:2.9A :13.3/9.5

5.0A: 22.0/19.9,1 5.2/ 13.8,10.9/9.8

EER

W/W

3.9

3.65

EER

(Btu/h)/W

13.3

12.5

Cross-sectional Area of Power Cable Conductor

AWG 12

Recommended Power Cable(Core)

N

3

Min/Max. Voltage

V

187/253

238/291

187/253

Air Flow Volume(H)

CFM

312

330

Dehumidifying Volume Pint/h

1.7

2.1

Application Area

sq ft

250-300

350-400

Permissible Excessive

Operating Pressure for psig

840

the Discharge Side

Permissible Excessive

Operating Pressure for psig

275

the Suction Side

Maximum Allowable Pressure

psig

840

Metering Device

—

Capillary

Dimension (W)

inch

42.1

Dimension (H)

inch

16.0

Dimension (D)

inch

21.5

Net Weight

lb

110.3

110.2

110.3

Refrigerant

—

R32

Refrigerant Charge

oz

17.6

17.3

Stacked Layers

5

Fan Type

—

Cross-flow

Fan Diameter Length(D×L)

inch

4 3/4 ×28

Cooling Speed

r/min

990/880

1000/890

1060/940

Heating Speed

r/min

990/880

1000/890

1060/940

Fan Motor Power Output W

18

10

21

Fan Motor RLA

A

0.1

0.2

Fan Motor Capacitor

F

1

1.5

Figure 201 PDE09R3SGR3
265 60 1 2930 10000 800 5000/3450/2450 3.2 18.9/13.1/9.3
1120 5050/3500/2500 3.9A: 19.1/13.3/9.5 3.7 12.5 AWG 12
3 238/291
330 2.1 350-400
840
275
840 Capillary
42.1 16.0 21.5 110.3 R32 17.3
5 Cross-flow 4 3/4 ×28 1060/940 1060/940
21 0.2 1.5

8

SPECIFICATIONS

PTAC W/ Electric Heat 7000-9000 BTU

Model

—

PDE07K3SGR3

PDE07R3SGR3

Evaporator Form

—

Aluminum Fin-copper Aluminum Fin-copper

Tube

Evaporator Pipe Diameter

inch

0.3

Evaporator Row-fin Gap inch

3-1/18

Evaporator Coil Length (L×D×W)

inch 27 (1/2)/9 (1/2)/1 (1/2) 27 (1/2)/9 (1/2)/1 (1/2)

Fuse Current

A

3.2

Set Temperature Range

°F

61-86

Sound Pressure Level (H)

dB (A)

50

Sound Pressure Level (L)

dB (A)

46

Sound Power Level (H) dB (A)

60

Sound Power Level (L) dB (A)

56

Compressor Oil

—

FW68DA or equivalent FW68DA or equivalent

Compressor Type

—

Rotary

Compressor LRA.

A

13

12

Compressor RLA

A

2.2

Compressor Power Input W

495

486

Compressor Overload Protector

—

UP3-042

HPA-112L

Fan Type

—

Axial-flow

Fan Diameter

inch

14

Fan Motor Speed

rpm

1340/1120

Fan Motor Power Output W

20

Fan Motor RLA

A

0.2

0.3

Fan Motor Capacitor

F

2

1.5

Outdoor Unit Air Flow Volume

CFM

470.8

471

Condenser Form

—

Aluminum Fin-copper Aluminum Fin-copper

Tube

Condenser Pipe Diameter

inch

12/61

Condenser Rows-fin Gap inch

3-1/18

Condenser Coil Length (L×D×W)

inch

30 3/4×13 1/2×1 3/8 30 3/4×13 1/2×1 3/8

Cooling Operation Ambient Temperature Range

°F

64.4-115.0

Heating Operation Ambient Temperature Range

°F

-19.4-77

-19.4–75

Sound Pressure Level (H)

dB (A)

62

Sound Pressure Level (L)

dB (A)

57

58

Sound Power Level (H) dB (A)

72

Sound Power Level (L) dB (A)

67

68

PDE09K3SGR3 Aluminum Fin-copper Tube
0.3 3-1/18 27 (1/2)/9 (3/4)/1 (1/2)
3.2 61-86
50
46 60 56 68SL or equivalent Rotary 17 3.1 689 HPA-318 Axial-flow 14 1340/1120 20 0.3 2 471
Aluminum Fin-copper Tube
12/61 3-1/18 30 3/4×13 1/2×1 3/8
64.4-115.0
-19.4-77
62
57 72 67

Figure 201 PDE09R3SGR3
Aluminum Fin-copper Tube 0.3 3-1/18
27 (1/2)/9 (3/4)/1 (1/2) 3.2
61-86 50
46 60 56 68SL or equivalent Rotary 15 3.4 682 HPA-512 Axial-flow 14 1340/1120 20 0.3 1.5
471
Aluminum Fin-copper Tube 12/61 3-1/18
30 3/4×13 1/2×1 3/8
64.4-115.0
-19.4-77
62
57 72 67

9

SPECIFICATIONS
PTAC W/ Electric Heat 12000-15000 BTU

Figure 202

Model Rated Voltage Rated Frequency Phases Cooling Capacity Cooling Capacity Cooling Power Input Electric Heating Power Input Cooling Current Input Electric Heating Current Input
Rated Input
Rated Current
EER
EER
Cross-sectional Area of Power Cable Conductor Recommended Power Cable(Core) Min/Max. Voltage Air Flow Volume(H) Air Flow Volume(L) Dehumidifying Volume Application Area Permissible Excessive Operating Pressure for the Discharge Side Permissible Excessive Operating Pressure for the Suction Side Maximum Allowable Pressure Metering Device Dimension (W) Dimension (H) Dimension (D) Net Weight Refrigerant Refrigerant Charge Stacked Layers Fan Type Fan Diameter Length(D×L) Fan Speed Fan Motor Power Output Fan Motor RLA

-V Hz -W Btu/h W W A A
W
A W/W (Btu/ h)/W
N V CFM CFM Pint/h sq ft
psig
psig
psig —
inch inch inch lb
-oz
-inch r/min W
A

PDE12K3SGR3 230/208 60 1 3605/3546
12300/12100 1060/1020 5000/4090, 3450/2830, 2450/2010
4.7/5.0
21.8/19.7,15.0/ 13.6,10.7/9.7
1270:5050/4130,3500/2860,2 500/2040
6.2 22.0/19.9/, 15.2/13.8/, 10.9/9.8 3.4/3.46
11.6/11.8
AWG 12
3
187.2/253 341.3 306.0 2.7
450-550
840
275
840
Capillary 42 16.0
21 1/2 114.7 R-32 21.2
5 Cross-flow
4 3/4 ×28
1130/970 23 0.2

PDE12R3SGR3 265 60 1 3605 12300 1060
5000/3450/2450 4
18.9/13.1/9.3
1270 5050/3500/2500
4.8:19.1/13.3/9.5 3.4 11.6
AWG 12
3 238.5/291.5
341.3 306.0 2.7 450-550
840
275
840 Capillary
42 16.0 21 1/2 114.7 R-32 21.2
5 Cross-flow 4 3/4 ×28 1130/950
20 0.2

PDE15K5SGR3 230/208 60 1 4309/4220
14700/14400 1420/1380 5000/4090, 3450/2820, 2450/2000
6.0/6.5
21.8 19.7, 15.0 13.6, 10.7 9.7
1890 5050/4130, 3500/2860, 2500/2040
22.0/19.9/,15.2 /13.8/,10.9/9.8/
3.05/3.1
10.4/10.6
AWG 12
3
187.2/253 341 306 3.2
550-800
840
275
840
Capillary 42 16
21 1/2 114.7 R-32 19.8
5 Cross-flow
4 3/4 ×28
1130/970 23 0.2

PDE15R5SGR3 265 60 1 4339 14800 1400
5000/3450/2450 5.3
18.9/13.1/9.3
1890 5050/ 3500/2500
2:7A 19.1/13.3/9.5 3.1 10.6
AWG 12
3 249/291.5
341.3 306.0 3.2 550-800
840
275
840 Capillary
42 16 21 1/2 114.7 R-32 18.0 5 Cross-flow 4 3/4 ×28 1130/970 23 0.2

10

SPECIFICATIONS

PTAC W/ Electric Heat 12000-15000 BTU

Model

—

PDE12K3SGR3

PDE12R3SGR3

PDE15K5SGR3

PDE15R5SGR3

Fan Motor Capacitor

F

1

1.5

1

1.5

Evaporator Form

— Aluminum Fin-copper Tube Aluminum Fin-copper Tube Aluminum Fin-copper Tube Aluminum Fin-copper Tube

Evaporator Pipe Diameter

inch

0.3

Evaporator Row-fin Gap inch

3-1/18

Evaporator Coil Length (L×D×W)

inch

27 (1/2)/9 (1/2)/1 (1/2) 27 (1/2)/9 (1/2)/1 (1/2) 27 (1/2)/9 (3/4)/1 (1/2) 27 (1/2)/9 (3/4)/1 (1/2)

Fuse Current

A

3.2

Set Temperature Range °F

61-86

Sound Pressure Level (H)

dB (A)

53

Sound Pressure Level (L)

dB (A)

50

Sound Power Level (H) dB (A)

63

Sound Power Level (L) dB (A)

60

Compressor Oil

—

FW68DA or equivalent

Compressor Type

—

Rotary

Compressor LRA.

A

30

21

35.2

26

Compressor RLA

A

4

3.3

5

6.4

Compressor Power Input W

872

855

1180

1120

Compressor Overload Protector

—

HPA-425

HPA-518

HPA-535L

HPA-422H

Fan Type

—

Axial-flow

Fan Diameter

inch

14

Fan Motor Speed

rpm

1550/1390

1550/1380

1550/1390

Fan Motor Power Output W

65

45

65

45

Fan Motor RLA

A

0.5

0.4

0.5

0.4

Fan Motor Capacitor

F

2.5

Outdoor Unit Air Flow Volume

CFM

565.0

565

Condenser Form

— Aluminum Fin-copper Tube Aluminum Fin-copper Tube Aluminum Fin-copper Tube Aluminum Fin-copper Tube

Condenser Pipe Diameter

inch

12/61

Condenser Rows-fin Gap inch

3-1/18

Condenser Coil Length (L×D×W)

inch

(30 7/10)×13 1/2×1 9/26 (30 7/10)×13 1/2×1 9/26 (30 7/10)×13 1/2×1 9/26 (30 7/10)×13 1/2×1 9/26

Cooling Operation

Ambient Temperature

°F

Range

64.4-115.0

55-83

Heating Operation

Ambient Temperature

°F

Range

-19.4-77

Sound Pressure Level (H)

dB (A)

66

Sound Pressure Level (L)

dB (A)

63

Sound Power Level (H) dB (A)

76

Sound Power Level (L) dB (A)

73

11

SPECIFICATIONS

PTAC W/ Heat Pump 7000 -9000 BTU

Model

—

PDH07K3SGR3

PDH07R3SGR3

PDH09K3SGR3

PDH09R3SGR3

Rated Voltage

V

230/208

265

230/208

265

Rated Frequency

Hz

60

Phases

—

1

Cooling Capacity

W

2172/2110

2140

2843/2755

2875

Cooling Capacity

Btu/h

7400/7200

7300

9700/9400

9800

Heating Capacity

W

1755/1700

1755

2491/2403

2520

Heating Capacity

Btu/h

6000/5800

6000

8500/8200

8600

Cooling Power Input

W

570/560

560

800/780

810

Heating Power Input

W

490/470

490

690/670

690

Electric Heating Power Input

W 3450/2830, 2450/2010

3450/2450

5000/4090,3450/ 2830,2450/2010

5000/3450 /2450

Cooling Current Input

A

2.4/2.6

2.1

3.6/3.9

3.1

Heating Current Input

A

2.1/2.3

1.8

3.1/3.2

2.6

Electric Heating Current Input

A

15.0/13.6,10.7/9.7

13.1/9.3

21.8/19.7,15.0/ 13.6,10.7/9.7

18.9/13.1/9.3

Rated Input

W

680 570 3500/ 2860,2500/2040

745: 565 3500/2500

1070 930 5050/ 4130,3500/2860, 2500/2040

1220 920 5050/3500/2500

Rated Current

A

3.3A : 2.7A 15.2/ 13.8,10.9/9.8

2.9A, 2.2A 13.3/9.5

5.1A 3.9A 22.0/19.9, 15.2/13.8,10.9/9.8

3.6 3.3 19.1/13.3/9.5

EER

W/W

3.81/3.81

3.8

3.55/3.55

3.6

EER

(Btu/ h)/W

13.0/13.0

13

12.1/12.1

12.1

COP

W/W

3.6/3.6

3.6

3.6/3.6

3.7

COP

(Btu/ h)/W

12.3/12.3

12.3

12.3/12.3

12.5

Cross-sectional Area of Power Cable Conductor

AWG 12

Recommended Power Cable(Core) N

3

Min/Max. Voltage

V

187.2/253

238.5/291.5

187.2/253

238.5/291.5

Air Flow Volume(H)

CFM

311.9

330

Air Flow Volume(L)

CFM

282.5

282

Dehumidifying Volume

Pint/h

1.7

2.1

Application Area

sq ft

250-300

350-400

Permissible Excessive Operating Pressure for the Discharge Side

psig

840

Permissible Excessive Operating Pressure for the Suction Side

psig

275

Maximum Allowable Pressure

psig

840

Metering Device

—

Capillary

Dimension (W)

mm

1069

Dimension (W)

inch

42.1

Dimension (H)

mm

406

Dimension (H)

inch

16

Dimension (D)

mm

546

Dimension (D)

inch

21.5

Net Weight

kg

51

52

Net Weight

lb

112.5

114.7

Refrigerant

—

R32

12

SPECIFICATIONS

PTAC W/ Heat Pump 7000 -9000 BTU

Model

—

PDH07K3SGR3

Refrigerant Charge

oz

27.5

Stacked Layers

5

Fan Type

—

Cross-flow

Fan Diameter Length(D×L)

inch

4 3/4 ×28

Fan Speed

r/min

1000/890

Fan Motor Power Output

W

18

Fan Motor RLA

A

0.1

Fan Motor Capacitor

F

1

Evaporator Form

—

Aluminum Fin-copper Tube

Evaporator Pipe Diameter

inch

0.3

Evaporator Row-fin Gap

inch

3.1

Evaporator Coil Length (L×D×W) inch 27 (1/2)/9 (1/2)/1 (1/2)

Fuse Current

A

3.2

Set Temperature Range

°C

16-30

Set Temperature Range

°F

61-86

Sound Pressure Level (H)

dB (A)

50

Sound Pressure Level (L)

dB (A)

46

Sound Power Level (H)

dB (A)

60

Sound Power Level (L)

dB (A)

56

Compressor Oil

— FW68DA or equivalent

Compressor Type

—

Rotary

Compressor LRA.

A

13

Compressor RLA

A

2.2

Compressor Power Input

W

495

Compressor Overload Protector

—

UP3-042

Fan Type

—

Axial-flow

Fan Diameter

inch

14

Fan Motor Speed

rpm

1340/1120

Fan Motor Power Output

W

20

Fan Motor RLA

A

0.2

Fan Motor Capacitor

F

2

Outdoor Unit Air Flow Volume

CFM

470.8

Condenser Form

—

Aluminum Fin-copper Tube

Condenser Pipe Diameter

inch

0.3

Condenser Rows-fin Gap

inch

3.1

Condenser Coil Length (L×D×W) inch 30 3/4×13 1/2×1 3/8

Cooling Operation Ambient Temperature Range

°F

64.4-115.0

Heating Operation Ambient Temperature Range

°F

-19.4-77

Sound Pressure Level (H)

dB (A)

62

Sound Pressure Level (L)

dB (A)

58

Sound Power Level (H)

dB (A)

72

Sound Power Level (L)

dB (A)

68

PDH07R3SGR3

PDH09K3SGR3

PDH09R3SGR3

27.5

24.7

5

Cross-flow

4 3/4 ×28

1000/890

1060/940

10

21

0.1

0.2

1

1.5

Aluminum Fin-copper Tube

0.3

3.1

27 (1/2)/9 (1/2)/1 (1/2) 27 (1/2)/9 (3/4)/1 (1/2) 27 (1/2)/9 (3/4)/1 (1/2)

3.2

16-30

61-86

50

46

60

56

FW68DA or equivalent

68SL or equivalent

Rotary

12

17

15

2.2

3.1

3.4

486

689

682

HPA-112L

HPA-318

HPA-512

Axial-flow

14

1340/1120

20

0.3

1.5

2

1.5

471

Aluminum Fin-copper Tube

0.3

.3

3.1

30 3/4×13 1/2×1 3/8

64.4-115.0

-19.4–75
62 58 72 68

-19.4-77
62 58 72 68

13

SPECIFICATIONS

PTAC W/ Heat Pump 12000 – 15000 BTU

Model

—

PDH12K3SGR3

PDH12R3SGR3

PDH15K5SGR3

PDH15R5SGR3

Rated Voltage

V

230/208

265

230/208

265

Rated Frequency

Hz

60

Phases

—

1

Cooling Capacity

W

3546/3488

3517

4279/4162

4250

Cooling Capacity

Btu/h

12100/11900

12000

14600/14200

14500

Heating Capacity

W

3195/3136

3135

4018/3957

3898

Heating Capacity

Btu/h

10900/10700

10700

13800/13300

13300

Cooling Power Input

W

1040/1000

1030

1400/1360

1390

Heating Power Input

W

940/900

920

1310/1250

1250

Electric Heating Power Input W

5000/4090,3450 /2830,2450/2010

5000/3450/2450

5000/4090,3450 /2820,2450/2000

5000/3450/2450

Cooling Current Input

A

4.6/4.9

4

6.0/6.5

5.3

Heating Current Input

A

4.1/4.3

3.5

5.6/5.9

4.7

Electric Heating Current Input A

21.8/19.7,15.0 /13.6,10.7/9.7

18.9/13.1/9.3

21.8 19.7 ,15.0 13.6 , 10.7 9.7

18.9/13.1/9.3

Rated Input

W

1270 1130 5050/4130, 3500/2860,2500/2040

1270 1100 5050/3500/2500

1890 1650 5050/ 4130,3500/2860,2500/2040

1890 1650 5050 /3500/2500

Rated Current

A

6.2 5.3 22.0/ 19.9/,15.2/13.8/,10.9/9.8

4.8 4.2 19.1/13.3/9.5

8.2 7.9 22.0/ 19.9/,15.2/13.8/,10.9/9.8/

7A, 6.2A 19.1/13.3/9.5

EER

W/W

3.4/3.46

3.4

3.05/3.05

3.1

EER

(Btu/ h)/W

11.6/11.8

11.6

10.4/10.4

10.4

COP

W/W

3.4/3.46

3.4

3.1/3.1

3.1

COP

(Btu/ h)/W

11.6/11.8

11.6

10.6/10.6

10.6

Cross-sectional Area of Power Cable Conductor

AWG 12

Recommended Power Cable(Core)

N

3

Min/Max. Voltage

V

187.2/253

238.5/291.5

187.2/253

249/291.5

Air Flow Volume(H)

CFM

341.3

341

341.3

Air Flow Volume(L)

CFM

306.0

306

306.0

Dehumidifying Volume

Pint/h

2.7

2.8

3.2

Application Area

sq ft

450-550

550-800

Permissible Excessive

Operating Pressure for the psig

840

Discharge Side

Permissible Excessive Oper-

ating Pressure for the Suction psig

275

Side

Maximum Allowable Pressure psig

840

Metering Device

—

Capillary

Dimension (W)

inch

42.1

Dimension (H)

inch

16

Dimension (D)

inch

21.5

Net Weight

lb

119.1

120.2

Refrigerant

—

R32

Refrigerant Charge

oz

28.9

29.6

28.6

Stacked Layers

5

14

SPECIFICATIONS

PTAC W/ Heat Pump 12000 – 15000 BTU

Model

—

PDH12K3SGR3

PDH12R3SGR3

PDH15K5SGR3

PDH15R5SGR3

Fan Type

—

Cross-flow

Fan Diameter Length(D×L)

inch

4 3/4 ×28

Fan Speed

r/min

1130/970

1130/950

1130/970

Fan Motor Power Output

W

23

20

23

Fan Motor RLA

A

0.2

Fan Motor Capacitor

F

1

1.5

1

1.5

Evaporator Form

— Aluminum Fin-copper Tube Aluminum Fin-copper Tube Aluminum Fin-copper Tube Aluminum Fin-copper Tube

Evaporator Pipe Diameter

inch

0.3

Evaporator Row-fin Gap

inch

3.1

Evaporator Coil Length (L×D×W)

inch 27 (1/2)/ 9 (1/2)/1 (1/2) 27 (1/2)/ 9 (1/2)/1 (1/2) 27 (1/2)/ 9 (1/2)/1 (1/2) 27 (1/2)/ 9 (1/2)/1 (1/2)

Fuse Current

A

3.2

Set Temperature Range

°F

61-86

Sound Pressure Level (H) dB (A)

53

Sound Pressure Level (L)

dB (A)

50

Sound Power Level (H)

dB (A)

63

Sound Power Level (L)

dB (A)

60

Compressor Oil

—

FW68DA or equivalent

Compressor Type

—

Rotary

Compressor LRA.

A

30

21

35.2

26

Compressor RLA

A

4

4.5

5

6.4

Compressor Power Input

W

872

855

1180

1120

Compressor Overload Protector

—

HPA-425

HPA-518

HPA-535L

HPA-422H

Fan Type

—

Axial-flow

Fan Diameter

inch

14

Fan Motor Speed

rpm

1550/1390

1550/1380

1550/1390

Fan Motor Power Output

W

65

45

65

45

Fan Motor RLA

A

0.5

0.4

0.5

0.4

Fan Motor Capacitor

F

2.5

Outdoor Unit Air Flow Volume m3/h

960

1000

Outdoor Unit Air Flow Volume CFM

565.0

588

Condenser Form

— Aluminum Fin-copper Tube Aluminum Fin-copper Tube Aluminum Fin-copper Tube Aluminum Fin-copper Tube

Condenser Pipe Diameter

inch

0.3

Condenser Rows-fin Gap

mm

3-1.3

Condenser Rows-fin Gap

inch

3.1

Condenser Coil Length (L×D×W)

inch (30 3/4)× 13 1/2 ×(1 1/2) (30 3/4)× 13 1/2 ×(1 1/2) (30 3/4)× 13 1/2 ×(1 1/2) (30 3/4)× 13 1/2 ×(1 1/2)

Cooling Operation Ambient Temperature Range

°F

64.4-115.0

55-83

Heating Operation Ambient Temperature Range

°F

-19.4-77

Sound Pressure Level (H) dB (A)

66

Sound Pressure Level (L)

dB (A)

63

Sound Power Level (H)

dB (A)

76

Sound Power Level (L)

dB (A)

73

15

SPECIFICATIONS

Outdoor orifice Wire screen Discharge grille
Front panel

Coil tube sheets

Indoor coil

Basepan

Accessory outdoor grille
Accessory wall sleeve

Figure 202 (Typical Unit Components and Dimensions)

PDXWS Wall Sleeve Dimensions 16″ H x 42″ x W x 133/4″ D
Front Cover Dimensions 16″ H x 42″ x W x 7 3/4″ D
Cut-out Dimensions 161/4 x 42 1/4

16

SPECIFICATIONS

Electrical Data Make sure the wiring is adequate for your unit.
If you have fuses, they should be of the time delay type. Before you install or relocate this unit, be sure that the amperage rating of the circuit breaker or time delay fuse does not exceed the amp rating listed in Figure E.1.1. Must be installed on a single circuit with designated receptacle.

Table 1
Voltage Amps Heater Size
Receptacles

Receptacles and Fuse Types

230V

15

20

1.5/2.5kw 3.5kw

265V

30

15

20 30

5kw 1.5/2.5kw 3.5kw 5kw

WARNING

NEMA# Receptacle
NEMA# Plug

6-15R 6-20R 6-30R 7-15R 6-15P 6-20P 6-30P 7-15P

7-20R 7-30R 7-20P 7-30P

Electrical Shock Hazard
Make sure your electrical receptacle has the same configuration as your air conditioner’s plug. If different, consult a Licensed Electrician.
Do not use plug adapters. Do not use an extension cord. Do not remove ground prong.
Always plug into a grounded 3 prong outlet. Failure to follow these instructions can result in death, fire, or electrical shock.
DO NOT use an extension cord.
The cord provided will carry the proper amount of electrical power to the unit; an extension cord may not.
Make sure that the receptacle is compatible with the air conditioner cord

Figure 203 (Receptacles and Fuses)
Power Cord LCDI Test (208/230v)
All Friedrich 230/208V PTAC units are shipped from the factory with a Leakage Current Detection Interrupter (LCDI) equipped power cord. The LCDI device meets the UL and NEC requirements for cord connected air conditioners. To test your power supply cord:
1. Plug power supply cord into a grounded 3 prong outlet.
2. Press RESET.
3. Press TEST (listen for click; Reset button trips and pops out).
4. Press and release RESET
a. Listen for click; Reset button latches and remains in.
b. Check that the green indicator light is on once reset.
c. The power supply cord is ready for operation.

FUSE/CIRCUIT BREAKER

Use ONLY type and size fuse or HVAC/R
circuit breaker indicated on unit’s rating
plate. Proper current protection to the unit
is the responsibility of the owner. Specification of fuse on the main board: T3.15AH250V(unit: 208/230V) T3.15A 350VAC(unit: 265V)

GROUNDING RECEPTACLE

Unit MUST be grounded from branch circuit through service cord to unit, or through separate ground wire provided on permanently connected units. Be sure that branch circuit or general purpose outlet is grounded. The field supplied outlet must match plug on service cord and be within reach of service cord. Refer to Table 1 for proper receptacle and fuse type. Do NOT alter the service cord or plug. Do NOT use an extension cord.
The field supplied outlet must match plug on service cord and be within reach of service cord. Refer to Table 1 for proper receptacle and fuse type. Do NOT alter the service cord or plug. Do NOT use an extension cord.

NOTE: The LCDI device is not intended to be used as a switch. Once plugged in, the unit will operate normally without the need to reset the LCDI device. If the LCDI device fails to trip when tested, or if the power supply cord is damaged, it must be replaced with a new supply cord obtained from the product manufacturer, and must not be repaired.
RESET
TEST
WARNING:
TEST BEFORE EACH USE. TO TEST: PRESS RESET BUTTON. PLUG LCDI INTO POWER RECEPTACLE. PRESS TEST BUTTON, RESET BUTTON SHOULD POP UP. PRESS RESET BUTTON FOR USE.
DO NOT USE IF TEST IS FAILED. GREEN LIGHT INDICATES
PROPER OPERATION

Figure 204 (LCDI) 17

Electrical Data

SPECIFICATIONS

MODEL
PDH07K, PDH09K, PDH12K, PDH15K
PDH07K, PDH09K, PDH12K, PDH15K
PDH09K, PDH12K, PDH15K
PDH07R, PDH09R, PDH12R, PDH15R
PDH07R, PDH09R, PDH12R, PDH15R
PDH09R, PDH12R, PDH15R

HEATER Kw 2.5 3.5 5.0 2.5 3.5 5.0

POWER CORD KIT PXPC23015A
PXPC23020A (STD) PXPC23030 PXPC26515
PXPC26520A (STD) PXPC26530

VOLTAGE 208/230 208/230 208/230
265 265 265

AMPERAGE 15 20 30 15 20 30

RECEPTACLE NEMA 6-15r NEMA 6-20r NEMA 6-30r NEMA 7-15r NEMA 7-20r NEMA 7-30r

Power Cord Installation (265v)
All 265V PTAC/PTHP units come with a factory installed non-LCDI power cord for use in a subbase. If the unit is to be hard-wired refer to the instructions below. NOTE: It is recommended that the PXSB sub-base assembly, the PXCJA conduit kit (or equivalent) be installed on all hardwired units. If installing a flush-floor mounted unit, make sure the chassis can be removed from the sleeve for service and maintenance. POWER CONNECTION OPTIONS Appropriate power cord accessory kit is determined by the voltage,and amperage of the branch circuit. If the unit is to be hard wired, an accessory hard wire kit must be ordered.
IMPORTANT: For 265V units, if power cord accessory option is selected, the cord is only 18″ long and must plug into the accessory electrical 265V subbase. Be sure that your outlet matches the appropriate blade configuration of the plug and that it is within reach of the service cord.
Electrical Wiring
All wiring,including installation of the receptacle, must be in accordance with the NEC and local codes, ordinances and regulations. National codes require the use of an arc fault or leakage current detection device on all 208/230V power cords. Be sure to select the correct cord for your installation.

VOLTAGE SUPPLY Check voltage supply at outlet. For satisfactory results, the voltage range must always be within the ranges found on the data information plate.
Cord-connected Units The 250V- field supplied outlet must match the plug for the standard 208/ 230Vunits and be within reach of the service cord. The standard cord-connected 265V- units require an accessory electrical subbase for operation. Refer to Figure 203 for proper receptacle and fuse type.
Power Cord Protection The power cord for 230/ 208V units provide power cord fire protection. Unit power automatically disconnects when unsafe conditions are detected. Power to the unit can be restored by pressing the reset button on plug head. Upon completion of unit installation for 230/ 208V models,an operational check should be performed using the TEST/RESET buttons on the plug head.
NOTE: The 265V models do not incorporate this feature as they require use of the electrical subbase accessory To install the line voltage power leads and conduit to chassis, refer to the Installation and Operation Manual.
WARNING

Wire Size Install a single branch circuit. All wiring must comply with local and national codes. All units are designed to operate off ONE single branch circuits only. NOTE: Use copper conductors only. Prepare the 265V (or 230V) power cord for connection to the chassis’ power cord connector by cutting the cord to the appropriate length.
Grounding For safety and protection, the unit is grounded through the service cord plug or through separate ground wire provided on hard wired units. Be sure that the branch circuit or general purpose outlet is grounded.

Electrical Shock Hazard
Make sure your electrical receptacle has the same configuration as your air conditioner’s plug. If different, consult a Licensed Electrician.
Do not use plug adapters. Do not use an extension cord. Do not remove ground prong.
Always plug into a grounded 3 prong outlet. Failure to follow these instructions can result in death, fire, or electrical shock.

18

OPERATION

Air Flow Selection and Adjustment

VENTILATION CONTROL

The ventilation control lever is located at left side of unit, behind front panel. NOTE:The vent door shipping hardware must be removed before using vent control lever. See Installation Instructions. When set at close POSITION, only the air inside the room is circulated and filtered.
When set at open POSITION, some outdoor air will be drawn into room. This will reduce heating or cooling efficiency. Energy Tip : Keep the vent control at POSITION. Room air will be filtered and circulated.

Open position Close position
Vent Control (Pull lever through label
to operate.)
(Ventilation Control Location)

ADJUSTING AIR DIRECTION
To adjust air direction:
1.Remove front panel. 2.Remove louver screws that hold louver insert in place (from back side of front panel). 3.Turn louver insert and rotate 180 4.Replace louver insert. 5.Replace screws and front panel.

Louver screws

(Backside of Front Panel)
Air discharge upward

Air discharge outward (Default)

19

OPERATION

Function and Control

Auxiliary dip switch controls are located behind front panel, through an opening below the control panel. To access, remove front panel. Dip switches are accessible without opening the control box. Unit must be powered OFF to effectively change their status. Factory settings for dip switches will be in the DOWN position. See Table 5-Dip Switch Functions for functions of each dip switch position.

Dip Switches
Figure 304 (Dipswitch Location on Unit)

Dip switch

UP Dow n

Figure 305 (Dip Switches)

Freeze guard Setpoint Limit 1 Setpoint Limit 2 Not Used
Not Used
Wall Thermostat enable Electric heat only (for Heat Pumps

Table 306 (DIP SWITCH FUNCTIONS)

No.

UP

DOWN

REMARKS

DEFAULT

1

Electric Heat Only

Heat Pump

For Heat Pump unit only.

DOWN

2

Wall Thermostat Enable

Control Panel Enable

DOWN

Two configurations (5* 6)

6* 5

UP* UP 68 —75°F

UP* DOWN 63 —80°F

DOWN* UP 65 —78°F

DOWN* DOWN 61 —86°F

combine to selec t set point range. When set point limit set, dis-

DOWN* DOWN 61 —86°F

(full range)

play al ways sh ows full

range.

7

Freeze Guard Disable

Freeze Guard Enable

DOWN

Electric Heating Only/Emergency Heat (For Heat Pump Units Only)
This setting is typically used for Emergency Heating.
Wall Thermostat Enable
A wired wall thermostat can be connected to the unit. If it is, this dipswitch must be moved to the Wall Thermostat Enable Position, before the wall thermostat will begin control.
Setpoint Temperature Limits
Provides a restricted range of temperature control.
Room Freeze Protection
If unit senses a room temperature below 40°F, the fan motor and electric strip heat will turn on and warm the room to 50°F. The fan stops a short time after the temperature is satisfied.

20

Function and Control

OPERATION

IMPORTANT : When unit is first started, high humidity conditions can cause condensation to form on discharge grill. .Keep doors and windows closed. Room humidity will decrease and moisture will evaporate.

High

Heat

Power

Low

Cool

Auto Fan Speed

Constant Fan
Mode

Temperature

Figure 307 (Display)
ABOUT THE CONTROLS ON YOUR UNIT
NOTE: In case of a power failure, the unit will remember the last programmed settings and will restart to those settings. 1. When the unit is in off mode, turn on the unit by Power; if pressing up/down button, dual-8 display will turn off after indoor temperature displays for 15 sec; if pressing mode button, controller will resume to related state, and operation indication lamp will turn on (mode button including cooling mode button, heating mode button and fan mode button)
2. Every button is enabled when the unit is on. · Power: Turns the unit on and off. · Cooling mode button: when the unit is on, press the Cool button, and the unit will run under cooling mode. · Heating mode button: when the unit is on, press the Heat button, and the unit will run under heating mode. · Constant Fan button: when the unit is on, press the Constant Fan Button, and the unit will run under fan mode. · Low speed button: when the unit is on, press the low fan button, and thin unit will run at low fan speed. · High speed button: when the unit is on, press the high fan button, and thin unit will run at high fan speed. · Auto speed button: When the unit is on, press Auto button, and the unit fan speeds will be automatically adjusted according to ambient
temperature and demand for cooling and heating. · UP/DOWN: Adjust preset temperature 61-86°F 16-30°C by UP/DOWN.
Allocation mode will be started up if pressing the buttons of low speed and Set-point down for 5 Sec.. when the unit is on in 30 Sec.. . After entering into allocation mode, adjust temperature compensation by buttons which leads the unit in on/off condition, and it acts after it overloads 3 Sec..; if ambient temperature changing leads the unit in on/off condition, it will act after exit allocation mode. Under allocation mode: Choose below 4 allocation modes by low speed button. First Mode: Fahrenheit/Celsius display mode The Fahrenheit/Celsius display mode will be shifted if pressing Set-point up or Set-point down. F means Fahrenheit display mode C means Celsius display mode. Second Mode: Adjust cooling temperature compensation value mode. Press Set- point up/ Set-point down will increase/decrease compensation temperature 1°F(or °C). The adjustment range of indoor ambient temperature compensation value is -6°F~+6°F(-3°C~+3°C) (cooling mode LED is on.) Third Mode: Adjust heating temperature compensation value mode. Press Set-point up/Set-point down will increase/decrease compensation temperature 1°F (or °C) The adjustment range of indoor ambient temperature compensation value is -6°F~+6°F(-3°C~+3°C) (heating mode LED is on.) The temperature compensation is default 0 and allocates different compensation value under cooling and heating mode, the compensation value can not be adjusted under fan mode. Forth Mode: Display shift of preset temperature and ambient temperature under heating and cooling mode. Display of preset temperature and ambient temperature can be shifted if pressing Set-point up or Set-point down. Preset temperature display: dual-8 displays SP, after exiting allocation mode, preset temperature will display under heating and cooling mode. Ambient temperature display: dual-8 displays AA, after exit allocation mode, ambient temperature will display under heating and cooling mode. In below situation: preset temperature will display 10 Sec.., then display ambient temperature. 1. Press mode button. (mode button includes: cooling mode button, heating mode button) 2. Energization after power off. 3. Turn off the unit after turn on unit.
21

OPERATION
Function and Control
4. EM off after on. 5. Adjust preset temperature by Set-point up and Set- point down. Exiting measure of allocation mode: for above allocation mode, there is no button action if pressing mode button (including cooling mode button, fan mode button and heating mode button) or in 30 Sec., the unit will exit allocation mode.

Electric Heating Only/Emergency Heat This setting is typically used for Emergency Heating. Wall Thermostat Enable A wired wall thermostat can be connected to the unit. If it is,this dip switch must be moved to the Wall Thermostat Enable Position, before the wall thermostat will begin control. Set-point Temperature Limits Provides a restricted range of temperature control. Room Freeze Protection If unit senses a room temperature below 40°F,the fan motor and electric strip heat will turn on and warm the room to 50°F. The fan stops a short time after the temperature is satisfied.

Cooling mode Sequence of Operation

Under cooling mode, cooling mode indicator is on and the set fan speed indicator is on. Dual 8 displays set temperature.

When

Tindoor

.+T
amb indoor

amb.

T + compensation preset

2°F(1°C),

the

unit

operates

under

cooling.

Outdoor

fan

and

indoor

fan

operates

in

set

speed.

When

the starting condition of compressor is reached, outdoor fan will operate and compressor will operate 10s later.

Tindoor

+T
amb. indoor

amb.

T – compensation preset

2°F(1°C),

the

unit

sops

operation.

In

this

case,

compressor

and

outdoor

fan

stop

operation.

Under

indoor fan cycle mode, indoor fan will stop operation after operating at set fan speed for 60s (except requiring the indoor fan to operate in

protection mode); if fan cycle mode is not selected, indoor fan will operate at set fan speed.

Tpreset

–

2°F(1°C)<Tindoor

+T
amb. indoor

amb.

<T + compensation preset

2°F(1°C),

the

unit

keeps

status.

When the indoor fan is set at high speed, outdoor fan operates according to high speed.

When the indoor fan is set at low speed, outdoor fan operates according to low speed. When the unit starts cooling mode for the first time and indoor fan is set at low speed, outdoor fan will start at high speed. After operating

for 3.5 min. and outdoor tube temperature is below 140°F(60°C), outdoor fan turns to low speed. First time start-up includes: switch to low speed cooling from non-cooling mode; the unit starts low speed cooling for the first time or enters low speed cooling after power failure.

During cooling mode and there is no outdoor condenser high temperature protection, unit stops when reaching temperature point, unit

stops for temperature sensor error, or unit stops for freeze protection previously, when the start-up condition of outdoor fan is met, indoor

fan will operate at high fan speed for 3 sec. and then turn to set fan speed. If high temperature protection occurs during cooling mode,

outdoor fan is forced to operate at high speed. When the start-up conditions of outdoor fan in heating mode are met, outdoor fan will

operate at high fan speed for 3 sec. and then turn to set fan speed. When the indoor fan starts operation, indoor fan will operate at high fan

speed for 3 sec. and then turn to set fan speed.

Constant fan: Press this button under cooling or heating mode to turn on or turn off constant fan function. (It is invalid in wired controller

mode) If constant fan mode is on, the fan motor will operate constantly. If constant mode is off, the fan will stop as the load stops. Fan speed

is controlled by fan speed button (If wired controller is connected, fan speed follows the command of wired controller. The controller will

control if the fan shall operate or not). The status will not change when switching modes, turning on unit, turning off unit, switching to wired controller mode, switching to panel mode, energizing after power failure; if operating for the first time or memory chip is broken, it defaults

to off.

22

OPERATION

Function and Control

Heating mode

Under heating mode, heating mode LED and set fan speed LED is on. Dual 8 displays set temperature. If select displaying ambient temperature in

additional function setting, the dual 8 will display as the display way described in this mode. The set temperature and fan speed will keep the same

when switching modes.

Working condition and process for heating

Operation condition and process (electric heater and compressor can’t operate at the same time)

When Tpreset – 5°F(3°C)<T indoor amb. -Tindoor amb. T compensation preset -2°F(1°C), compressor operates at heating mode. Meanwhile, the 4-way valve, indoor fan and outdoor fan start operation at set speed. Compressor can operate after 10 sec. If compressor operates and it satisfies Tindoor amb. -Tindoor amb. compensation Tpreset – 5°F(3°C) and the minimum operation time for compressor and outdoor fan stop operation immediately. 1 sec. later, electric heater will start. Once the electric heater operates, it will quit until condition is satisfied (entering protection function is excluded).

When compressor needs to heat, if compressor can’t be started up due to protection function, electric heater will start heating instead of

compressor 15s later. It will stop operation until satisfying the temperature point (customized requirement); When Tindoor amb. – Tindoor amb. compensation

WThpreesnet

– 5°F(3°C),the electric heater operates. Indoor Tindoor amb. – Tindoor amb. compensation

fan operates at set fan speed. â ¥ T preset + 2 °F(1°C), compressor

or

electric

heater

stops

operation.

Under

fan

cycle mode, indoor fan operates at the condition of blowing residual heat; if fan cycle mode is not selected, indoor fan will operate at set fan

speed.

When Tpreset – 2°F(1°C)<Tindoor -T amb. indoor amb. <T compensation preset + 2°F(1°C) the unit keeps previous operation status. Auto fan speed mode

a. Auto fan speed in cooling mode

High speed:TAMB. +Tindoor amb. T compensation preset + 4°F(2°C) Low speed:Tamb. +Tindoor amb. T compensation preset Not change:Tpreset< Tamb.+Tindoor amb. < compensation Tpreset + 4°F(2°C). When entering auto fan speed mode, it will operate according to auto high speed.

b. Auto fan speed in heating mode

High speed: Tamb.-Tindoor amb. compensation Tpreset – 4°F(2°C) Low speed: Tamb. -Tindoor amb. compensation Tpreset Not change: Tpreset – 4°F(2°C)<Tamb.-Tindoor amb. compensation < Tpreset When entering auto fan speed mode, it will operate according to auto high speed.

Note: a. Under auto fan speed control in any mode, there will be a delay of 3.5 min. minimum when switching the speed of indoor fan(there

is no delay of 3.5 min. when switching mode).

23

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.
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.

Suction Line

Discharge Line

Evaporator Coil

Condenser Coil

Metering

Compressor

Device

Refrigerant Drier Liquid

Refrigerant

Line

Strainer

Figure 308 (Sequence of Operation)

24

Refrigerant System Diagram

OPERATION

(1)Cooling + Heat Pump + Auxiliary Electric Heater

COOLED AIR

BLOWER WHEEL

HOT AIR

INDOOR COILS ELECTRIC HEATER

CAPILLARY

AXIAL FAN COMPRESSOR

REFRIGERANT FLOW DIRECTION

NOTES:

(2) Cooling + Electric Heater

COOLED AIR

BLOWER WHEEL

AXIAL FAN

INDOOR COILS ELECTRIC HEATER

COMPRESSOR CAPILLARY

REFRIGERANT FLOW DIRECTION
Figure 309 (Sequence of Operation) 25

HOT DISCHARGED AIR COOLED AIR OUTDOOR COILS COOLING MODE HEATING MODE
HOT DISCHARGED AIR OUTDOOR COILS

Auxiliary Controls
Install Thermostat
All PDH model PTAC units are factory configured to be controlled by either the chassis mounted Smart Center or a 24v remote wall mounted thermostat. The thermostat may be auto or
manual changeover as long as the control configuration matches that of the PTAC unit.
ALL PDH Models require a single stage cool, dual stage heat thermostat with an O reversing valve control. The Freidrich RT7 or RT7P thermostats are applicable.

Install thermostat Approximately 5 ft. from the floor. Install thermostat close to or in a frequently used room, preferably on an inside wall. The Thermostat should NOT be mounted: Close to a window, on an outside wall, or next to a door leading outside. Where it can be exposed to direct sunlight or heat, such as the sun, a lamp, fireplace, or any other temperature radiating object which may cause a false reading. Close to or in the direct airflow of supply registers and/or return air grilles. Any areas with poor air circulation, such as a corner, behind a door, or an alcove.

WARNING
Electrical Shock Hazard
Make sure your electrical receptacle has the same configuration as your air conditioner’s plug. If different, consult a Licensed Electrician.

WALL THERMOSTAT TERMINAL
IMPORTANT: Only trained,qualified personnel should access electrical panel on unit and install electrical accessories. Please contact your local electrical contractor,dealer,or distributor for assistance. Thermostat Wire Routing

Do not use plug adapters. Do not use an extension cord. Do not remove ground prong.
Always plug into a grounded 3 prong outlet. Failure to follow these instructions can result in death, fire, or electrical shock.

Thermostat wire is field supplied. Recommended wire gauge is 18 to 20 gauge solid

thermostat wire.

NOTE: It is recommended that extra wires are run to unit in case any are damaged during installation. Thermostat wire should always be routed around or under,

NEVER through,the wall sleeve. The wire should then be routed behind the front panel to the easily accessible terminal connector.

Figure 401(Wiring Thermostat To Unit) 1. Wire wall thermostat input.
NOTE: Terminal connector can be removed and replaced to simplify the wiring. NOTE: For heat pump models, anytime there is a second-stage call for heating from the wall thermostat, the unit will automatically switch over to electric heating. Install Thermostat Wiring 2. Pull terminal connector to remove. NOTE: Terminal connector can be removed and replaced to simplify thermostat wiring. 3. Connect wires from the thermostat to terminals on unit terminal connector. 4. Reinstall terminal connector.

R W Y O Gh Gl C

THERMOSTAT WIRE ROUTING (UNDER SLEEVE, BEHIND FRONT PANEL)
5. Ensure that unit is configured for wall thermostat enable. 6. Replace control panel label with wall thermostat label (included). 7. Restore power to unit.
NOTE: Refer to Table (Dip Switch Functions) to set the thermostat mode. NOTE: Refer to thermostat installation instructions for details on installing wall thermostat. NOTE: For thermostats that have only one fan speed output (on or auto), the fan speed is determined by how the terminal connector is wired. If Low fan is desired, wire the G output from the thermostat to GL on the unit’s terminal block. If Hi fan is desired, wire the G output from the thermostat to GH on the unit’s terminal block. NOTE: After proper installation, if your thermostat is not working properly, refer to the Trouble Shooting section.

26

Auxillary Controls
TERMINAL CONNECTIONS
The wall thermostat terminal block is located behind the front panel and is easily accessible on front of control panel.

LED STATUS

Energy Management Terminal Connections

Wall Thermostat Terminal Connections

Fig. 402 Terminal Connector and Status LED Location

! CAUTION
UNIT DAM AGE HAZARD Failure to follow this caution may result in equipment damage or improper operation. Improper wiring may damage unit electronics. Common busing is not permitted.Damage or erratic operation may result.

Energy Management (24VA C in)
Common

TYPICAL WALL THERMOSTAT

R W Y O See Note 1 GH

GL

C See Note 2

Fig. 403

TERMINAL BLOCK

NOTES: 1.Use terminal”O” for heat pump unit connection only. 2.Terminal”C”(common) is typically only required for digital thermostats.

TERMINAL
R W Y O (Energize for Heat) GH GL C

DESIGNATION 2 4 VAC
Electric Heat Compressor Rever sing Valve
High Fan Low Fan Common

NOTE: Any errant input combinations will be captured as thermostat wiring failures and will light the STATUS LED indicator on main board (see Intelligent Self—Checking Control section).
ENERGY MANAGEMENT INPUT (FRONT DESK CONTROL)
The controller can handle a switch signal from remote energy management input, called EM signal or front desk control. Input must be 24VAC. If system receives a 24VAC signal,it will turn unit off; otherwise, the unit runs in normal control.This function will be disabled under Freeze Guard protection. See Fig. 402 and Fig. 403 for terminal connections.

27

Routine Maintenance
Coils & Chassis NOTE: Do not use a caustic 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 antibacterial and antifungal 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 mold or mildew 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 / Condenser Fan / Shroud Inspect the indoor blower and its housing, evaporator blade, condenser fan blade and condenser shroud periodically (yearly or biyearly) and clean of all debris (lint, dirt, mold, fungus, etc.). Clean the blower housing area and blower wheel with an antibacterial / antifungal 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.
28

Basic Troubleshooting

TROUBLESHOOTING

SYMPTOM Unit Does Not Start
Unit Not Cooling/ Heating Room
Display Has Strange Numbers/ Characters On It Unit Making Noises

POSSIBLE CAUSES

SOLUTIONS

· Unit may have become unplugged. · Fuse may have blown. · Circuit breaker may have been tripped. · Unit may be off or in wall thermostat mode. · Check section on dip switch settings to verify dip
switches are set properly. · Unit may be in a protection or diagnostic failure
mode. See section on Intelligent Self- checking Control.

· Check that plug is plugged securely in wall receptacle. · Note : Plug has a test/reset button on it. Make sure that
the plug has not tripped. · Replace the fuse. See Note 1. · Reset circuit breaker. See Note 1. · Turn unit on (bottom right button on keypad). · Note: If the unit turns on, the LED will be green. If the unit
is off, the LED will be red. If there is no LED on, there is a problem with power or damage to the control.

· Unit air discharge section is blocked

· Make sure that curtains, blinds or furniture are not

· Temperature setting is not high or low enough Note:

restricting or blocking unit airflow.

Set-point limits may not allow the unit to heat or cool · Reset to a lower or higher temperature setting.

the room to the temperature desired.

· Remove and clean filters.

· Check section on dip switch settings.

· Allow sufficient amount of time for unit to heat or cool the

· Unit air filters are dirty.

room.

· Room is excessively hot or cold when unit is started. · Start heating or cooling early before outdoor temperature,

· Vent door left open

cooking, heat or gatherings of people make room

· Unit may be in a protection or diagnostic failure

uncomfortable.

mode. Check section on Intelligent Self—checking · Close vent door.

Control.

· Check dip switch settings for desired comfort.

· Compressor is in time delay. There is a protective

· Wait approximately 3 minutes for compressor to start

time delay (approx. 3 minutes) on starting the

compressor after a power outage (or restarting after

it has been turned off), to prevent tripping of the

compressor overload.

· The unit may be in a diagnostic condition. · The unit may be set for C (instead of F).

· Check Intelligent Self – checking Control section to determine if unit has had a failure.
· See the keypad configuration section.

· Clicking, gurgling and whooshing noises are normal during operation of unit.

Water Dripping Outside
Water Dripping Inside

· If a drain kit has not been installed, condensation runoff during very hot and humid weather is normal. See Note 2. If a drain kit has been installed and is connected to a drain system, check gaskets and fittings around drain for leaks and plugs.

· Wall sleeve is not installed level

· Wall sleeve must be installed level for proper drainage of condensation. Check that installation is level and make any necessary adjustments.

Ice Or Frost

·

Forms On Indoor ·

Coil

Low outdoor temperature Dirty filters

· When outdoor temperature is approximately 55 °F or below, frost may form on the indoor coil when unit is in Cooling mode. Switch unit to FAN operation until ice or frost melts.
· Remove and clean filters.

COMPRESSOR PROTECTION

· Power may have cycled, so compressor is in a restart protection.

· Random Compress or restart – Whenever the unit is plugged in, or power has been restarted, a random compressor restart will occur. After a power outage, the compressor will restart after approximately 3 minutes.
· Compress or Protection -To prevent short cycling of the compressor, there is a random startup delay of 3 minutes and a minimum compressor run time of 3 minutes.

NOTES: 1. If circuit breaker is tripped or fuse is blown more than once,contact a qualified electrician. 2. If unit is installed where condensation drainage could drip in an undesirable location,an accessory drain kit should be installed and connected to drain system

29

TROUBLESHOOTING
Diagnostic Codes
STATUS LED Indicator Definitions
INTELLIGENT SELF–CHECKING CONTROL Your PTAC has a computer board that continuously checks key components of the unit to ensure they are operating properly. Under normal operation, unit status indicator (STATUS,on main PCB), light is steadily ON. If there is a major problem,the unit will shut down and display a diagnostic failure code on the unit’s display. If it is only a minor failure and unit is correcting the fault by itself, the diagnostic code will be flashed on the status LED that can easily be seen when the front panel is removed. Failure STATUS codes are defined in the table below.

Diag Status Code Indicator

Description

Possible Causes

Solutions

Dual-8

1. The wiring terminal between

displays “f1”

indoor ambient temperature

1. Check wiring connections.

and status Indoor ambient temperature

sensor and controller is loose or 2. Check sensor resistance. (See

F1 indicator will sensor is open circuited or short- poorly connected.

appendix for temperature sensor

flash once

circuited.

2. Logic PCB has malfunctioned. resistance table) (15k at 77°f)

with a 3 sec.

3. Indoor ambient temperature 3. Replace logic PCB.

pause.

sensor is damaged.

F2

Dual-8 displays “f2″ and status indicator will flash twice with a 3 sec. pause.

Indoor coil temperature sensor is open circuited or short-circuited.

1. The wiring terminal between indoor evaporator temperature sensor and controller is loose or poorly connected. 2. Logic pcb has malfunctioned. 3. Indoor evaporator temperature sensor is damaged.

1. Check wiring connections. 2. Check sensor resistance. (See appendix for temperature sensor resistance table) (20k ohms at 77°f). 3. Replace logic PCB.

F3

Dual-8 displays”f3”.

Outdoor ambient temperature sensor is open circuited or shortcircuited.

1. The wiring terminal between outdoor ambient temperature sensor and controller is loose or poorly connected. 2. Outdoor ambient sensor is damaged 3. Logic PCB has malfunctioned.

1. Check wiring connections. 2. Check sensor resistance. (See appendix for temperature sensor resistance table) (20k ohms at 77°f). 3. Replace logic PCB.

F4

Dual-8 displays”f4″ and status indicator will flash four times with a 3s pause.

Condenser coil temperature sensor is open circuited or shortcircuited.

1. The wiring terminal between condenser coil temperature sensor and controller is loose or poorly connected. 2. Condenser sensor is damaged. 3. Logic PCB has malfunctioned.

1. Check wiring connections. 2. Check sensor resistance. (See appendix for temperature sensor resistance table) (20k ohms at 77°f). 3. Replace logic PCB.

Malfunction of discharge air

temperature sensor. Unit will

FJ

Dual-8 displays “fj”.

not operate. Evaporator high temperature above 136°f for 1

min. Will reset at 126°f.

1. Temperature sensor terminal at air discharge is loose. 2. Logic PCB has malfunctioned. 3. Air outlet temperature sensor is damaged. 4. Dirty coil. 6. Outdoor fan motor failure.

1. Check wiring connections. 2. Check sensor resistance. (See appendix for temperature sensor resistance table) (20k ohms at 77°f). 3. Check outdoor fan motor. Replace if faulty. 4. Clean coil and chassis if dirty. 5. Replace logic PCB.

30

TROUBLESHOOTING

Diagnostic Codes
Diag Status Code Indicator

Description

Low temperature prevention

FP Dual-8

protection. Unit will operate in

displays “fp”. electric heat only, until the room

temperature reaches 50º f.

Possible Causes
1. Indoor ambient temperature is lower than 40°f (5°c) continuously. 2. Indoor ambient temperature sensor is damaged. 3. Logic PCB has malfunctioned.

Solutions
1. Check wiring connections. 2. Check sensor resistance. (See appendix for temperature sensor resistance table) (15k at 77°f) 3. Replace logic PCB.

Status indicator will flash nine times with a 3 sec. pause.

Wrong wire connection indication for wired thermostat.

1. Thermostat wiring is incorrect. 2. Thermostat is faulty.

1. Correct wiring sequence. 2. Replace thermostat. 3. Replace logic PCB.

Status indicator will flash eight times with a 3 sec. pause.

High temperature prevention protection for evaporator. Compressor & outdoor fan shut down. Indoor fan remains operational. Electric heat is enabled after 15 sec. When the indoor coil temperature sensor detects 126ºF for less for two consecutive minutes, the compressor will return to operation.

Normal Operation for Heating.

Status indicator will flash six times with a 3 sec. pause.

Indoor fan operates; compressor stops operation, while outdoor fan operates or stop operation according to the tube temperature of condenser.

Normal Operation for Cooling.

Status indicator will flash five times with a 3 sec. pause.

Freeze prevention protection for evaporator. (Cooling mode) compressor & outdoor fan shut down. Indoor fan runs continuously. When the indoor coil temperature sensor detects 40ºF or more for two consecutive minutes, the compressor & outdoor fan will return to normal operation.

Normal Operation for Cooling.

31

TROUBLESHOOTING

Diagnostic Codes

Diag Status Code Indicator

Description

Possible Causes

Status indicator will flash seven times with a 3 sec. pause.

Frost prevention (heat pump). The compressor & outdoor fan will stop. The indoor fan will operate normally. If calling for heat; 15 seconds later the electric heaters will be energized. When the sensor detects 40º f or above for 10 consecutive minutes, the compressor will be available again to provide heating. Risk of outdoor fan damage due to ice build-up.

Normal Operation for Heating.

Solutions

Low refrigerant. The unit will

F0

Dual-8

not operate, check indoor coil

displays “f0”. thermistor location.

1. Evaporator coil sensor not reading properly or loose. 2. Logic PCB damaged.

1. See F0 troubleshooting Flow Chart

H3

Dual-8 displays “h3”.

Overload detection protection.

1. The outdoor temperature is higher than the operation temperature allowed for this unit. 2. The voltage of power source is too low. 3. The air flow volume of condenser is too low.

1. Check outdoor fan operation. 2. Clean coil and chassis if dirty. 3. Check compressor.

E5

Dual-8

Over-current protection of

displays “e5”. compressor.

1. Overload overheated. 2. Dirty condenser. 3. Faulty compressor. 4. Inadequate power supply. 5. Wire improperly routed around CT loop on power PCB. 6. Low refrigerant.

1. Allow unit to cool. Disconnect power from unit, by unplugging, then plug back in. 2. Check for dirty condenser or faulty compressor. 3. Check power supply. 4. Check refrigeration circuit. 5. Repair any wiring issues.

1. Open heater coil.

2. Defective logic PCB.

3. Indoor fan damage.

4. Power PCB detects current

A2

Dual-8 displays “a2”.

Malfunction protection for electric leak.

heating relay for compressor or 5. Loose wiring on board or

heater is broken.

heater harness.

6. A2 protection might also be

triggered by interference.

1. Disconnect plug for a few minutes to reset and clear a2 protection. 2. Check heater elements. 3. Check indoor fan operation. 4. Repair any wiring issues.

7. Wire improperly routed around

ct loop on power PCB.

32

Diagnostic Codes
Diag Status Code Indicator

TROUBLESHOOTING

Description

Possible Causes

Solutions

Unbalanced Electric Current

1. Abnormal operation of

detected between Null line and compressor or fan motors.

live line.

2. Transformer damaged.

U5

Dual-8 displays “U5”.

CT loops on Power PCB detecting an unbalance load condition

3. Heater shorted out. 4. Damaged Power PCB. 5. Damaged Logic PCB.

between L1 current and L2

6. Restriction in refrigeration

current.

system.

1. Check for proper operation of compressor and fan motors. 2. Check transformers. 3. Check heater elements. 4. Replace Logic PCB 5. Replace Power PCB. 6. Check refrigeration system.

A0

Electric heater combination wrong.

Power cord plug damaged or miswired at connector.

1. Check heater element. 2. Inspect wiring. 3. Inspect power cord connection.

A4

Electric heater current abnormal.

1. Heater element damaged. 2. Wiring damaged or loose.

1. Check heater element. 2. Inspect wiring

C7

Electric Heater temperature limiter switch open too long

1. Heater element damaged. 2. Wiring damaged or loose.

1. Check heater element. 2. Inspect wiring.

33

2. Troubleshooting for refrigerant insufficient protection F0

Main check points:

TROUBLESHOOTING

(1) compressor (2) refrigerant (3) filth blockage of air inlet/outlet, heat exchanger or system (4) main board
DeteFc0tioDniapgroncoesdtuirceCinoddeetaFillsoiws aCshbaerlot w :

Start the troubleshooting
for low refrigerant protection

Heat exchanger is too dirty or the air inlet/outlet is
blocked?
1 1
Does the compressor operate abnormally? Is there abnormal sound or refrigerant leakage? Is the
temperature of outer case too high?
1 1
Is the system blocked (filth blockage, ice blockage, grease blockage, and the 4-way valve is
opened completely)?
1 1

Clean the heat exchanger

<

and remove the obstruction

at the air inlet/outlet.

Is malfunction

<

eliminated?

Check whether there’s obstructions

nearby the condenser? If yes, please

remove it. Check the parts with

abnormal sound and replace these

<

parts with malfunctions; If there’s refrigerant leakage, please find out

the leakage points and weld it or

replace the damaged parts, vacuum

pump and then charge refrigerant

again.

Is malfunction

<

eliminated?

If the capillary frosts continuously

and the frost can’t be defrosted,

replace the capillary sub-assy,

<

vacuum pump and then charge refrigerant again. When starting

up the heat pump for heating, if the

4-way valve will not reverse, replace

the solenoid valve or the 4-way valve.

Is malfunction

<

eliminated?

If the refrigerant leaking?
1 1

Find out the leakage point to

weld it or replace the damage

<

parts, vacuum pump and then

charge refrigerant again.

Is malfunction

<

eliminated?

Replace the Logic PCB

End
34

3. Troubleshooting for overload protection H3
TROUBLESHOOTING Main check points:
(1) compressor (2) refrigerant (3) filth blockage for air inlet/outlet, heat exchanger or system (4) fan (5) main board
H3DeDtieacgtinonospircocCeodduereFinlodwetaCihlsairstas below :
Start

Heat exchanger is too dirty, or blocks the air inlet/outlet?
The rotate speed of fan is abnormal, rotate speed is too low or
the fan is not functioning;
Is compressor operation abnormal? Does strange noise or leakage occur? Is temperature
of outer casing too high?
Is the internal system blocked (dirt blockage, ice blockage, oil blockage, the 4-way valve is not
completely opened)?
Refrigerant leakage leads to overheat protection of compressor
Replace Logic PCB

Clean the heat exchanger and remove the plugs
Eliminate malfunction
Check the fan, re-install the fan to make it function normally
Eliminate malfunction
Check if there are any shelters near the condenser, if yes, take them away; check the component with abnormal sound, replace the faulted component; if the refrigerant is leaking, find out the leakage point and supplement the welding process or replace the broken component, conduct vacuuming and perfusion
Eliminate malfunction
If the capillary keeps defrosting, replace the capillary component, conduct vacuuming and perfusion; if the 4-way valve conducting heating with heat pump has no reversing, then replace the solenoid valve or 4-way valve
Eliminate malfunction
Find out the leakage point to supplement welding or replace the broken component, conduct vacuuming and perfusion again
Eliminate malfunction

End

35

COMPONENT TESTING
Hermetic Components Check

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.

Metering Device – Capillary Tube Systems All units are equipped with capillary tube metering devices. Checking for restricted capillary tubes. 1. Connect pressure gauges to unit. 2. Start the unit in the cooling mode. If after a few minutes of operation the pressures are normal, the check valve and the cooling capillary are not restricted. 3. Switch the unit to the heating mode and observe the gauge readings after a few minutes running time. If the system pressure is lower than normal, the heating capillary is restricted. 4. If the operating pressures are lower than normal in both the heating and cooling mode, the cooling capillary is restricted.

Check Valve A unique two-way check valve is used on the reverse cycle heat pumps. It is pressure operated and used to direct the flow of refrigerant
through the proper capillary tube during either the heating or cooling cycle.

NOTE: The slide (check) inside the valve is made of teflon. Should it become necessary to replace the check valve, place a wet cloth around the valve to prevent overheating during the brazing operation.

CHECK VALVE OPERATION 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 refrigerant flow chart. This directs the refrigerant through the cooling capillary tube to the indoor coil. 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.

One-way Check Valve (Heat Pump Models)
Figure 701 (Check Valve)

COOLING MODE In the cooling mode of operation, liquid refrigerant from condenser (liquid line) enters the cooling check valve forcing the heating check valve shut. The liquid refrigerant is directed into the liquid dryer after which the refrigerant is metered through cooling capillary tubes to evaporator. (Note: liquid refrigerant will also be directed through the heating capillary tubes in a continuous loop during the cooling mode).
HEATING MODE In the heating mode of operation, liquid refrigerant from the indoor coil enters the heating check valve forcing the cooling check valve shut. The liquid refrigerant is directed into the liquid dryer after which the refrigerant is metered through the heating capillary tubes to outdoor coils. (Note: liquid refrigerant will also be directed through the cooling capillary tubes in a continuous loop during the heating mode).

36

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) 37

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.
38

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 PPE must be utilized 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 determine this is the problem, replace the reversing valve. After all of the previous inspections and checks have been made and are determined correct, then perform the “Touch Test” on the reversing valve.

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)

40

Compressor Checks

COMPONENT TESTING

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 compressor. 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 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 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.

NOTE: The overload will automatically reset, but may require several hours before the heat is dissipated. Ensure that compressor overload switch has been rechecked after it cools down, before replacing compressor.

Checking the Internal Overload 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, and the compressor is not hot to the touch, the compressor overload is open, and the compressor should be replaced.

41

Compressor Checks

COMPONENT 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.
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 PPE must be utilized 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. 6. Non-condensables such as air and moisture in the system. Moisture is extremely destructive to a refrigerant system. 7. Capacitor.

Figure 705 (Resistance Chart)

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 performance 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.

42

COMPONENTS TESTING
Logic PCB Identification and Testing

7

1

6

2

3 4 5

No Name 1 Diagnostic Code Status Indicator

Voltage

2 Temp Sensors 3 Display 6 Wired wall Controller 7 Energy Management

Constant 2.8 vdc Constant 5 vdc

No Name

Voltage

4 Compressor. and Indoor Fan Control Voltage

5v

Constant 5vdc

12v

Constant 12vdc

Compressor

3vdc signal

4 way valve – energized for heat 3vdc signal

Fan H

3vdc signal

Fan L

3vdc signal

5 Heater and Outdoor Fan Control Voltage

+24

Constant 24vdc

Across Heat 245 and heat 155 3vdc signal

OF-H

3vdc signal

OF-L

3vdc signal

Figure 706 (Logic PCB) 43

COMPONENTS TESTING
Power PCB Identification and Testing
5.2.2 Silk screen on main board 2

12 3

4

5

6

7

12 No Name 1 Neutral wire interface
2 Transformer AC input
3 Neutral wire interface 4 Four-way valve terminal
(Energized for Heat) 5 Outdoor Fan- High
6 Outdoor Fan- Low
7 Indoor Fan
8 Transformer AC output
10 Heat 1 Relay control 12 Transformer AC output 2

11

10

9

8

Voltage
Constant Unit Power Supply
=Unit Constant Unit Power Supply Unit Power Supply when called for Unit Power Supply when called for Unit Power Supply Constant 12 VAC
Constant 24 VAC

No Name
9 Compressor. and Indoor Fan Control Voltage
5v

Voltage Constant 5vdc

12v Compressor

Constant 12vdc 3vdc signal

4 way valve – energized for heat
Fan H

3vdc signal 3vdc signal

Fan L

3vdc signal

11 Heater and Outdoor Fan Control Voltage

+24

Constant 24vdc

Across Heat 245 and heat1 55 3vdc signal

OF-H

3vdc signal

OF-L

3vdc signal

Figure 709 (Power PCB Voltage Checks) 44

COMPONENTS TESTING
Testing Electric Heat
1. Check Heater power at Molex Plug Use 4 terminal on heat 1 relay should =Unit Power Supply VAC on red white and black wires depending on configuration. White 1.55 kw Red 2.45 kw Black 1 kw 2. Heater resistance checks Check resistance from terminal on heat 1 relay to complete circuit. An open reading indicates faulty wiring, a broken element, or the thermal fuse has blown. Black 54.1 ohms Red 21.4 OHMS White 34.5 OHMS Check resistance from Black, red and white wires at molex plug to ground. If heater element is shorted to ground, correct wiring or replace heater element.
Figure 710 (Heater Element Checks) 45

UNIT DISASSEMBLY
Remove Unit Front Cover
1. Hold front end of filter with hand and then pull the filter upwards to remove it. See figure 501.

2. Drag the lower part of panel, pull it outwards and upwards to left, separate from clasps, and then remove the front panel. See Figure 502.

Figure 501

panel clasps

Figure 502

clasps

46

Unit Disassembly and Component Replacement

Replace Display PCB

2. Remove 5 screws attaching display PCB to cover. See figure 504.

Warning: Ensure there are no open flame sources or hot surfaces that
exceed 1200°F in the work area.

Warning: Discharge capacitors in a way that won’t cause any
spark. The standard procedure to short circuit the capacitor terminals usually creates sparks.

1. Remove display cover screw. See figure 503.

Figure 503

Figure 504 3. Remove Connectors. See figure 505.

Figure 505 47

Unit Disassembly and Component Replacement

Replace Logic PCB
Warning: Ensure there are no open flame sources or hot surfaces that
exceed 1200°F in the work area.

5. Remove Logic PCB cover. See figure 508.

Warning: Discharge capacitors in a way that won’t cause any
spark. The standard procedure to short circuit the capacitor terminals usually creates sparks.

1. Remove Unit Cover. See Remove Unit Front Cover.

2. Remove Display PCB. See Replace Display PCB.

3. Remove left access panel (3 screws and a wire tie.) See Figure 506.

Figure 508 6. Unplug connectors. See Figure 509.

Figure 506 4. Remove PCB Access Panel. See Figure 507.
a. Unplug thermostat connectors. b. Remove top screws (2 places). c. Remove lower screws (5 places).

Figure 507 48

Figure 509

Unit Disassembly and Component Replacement

Replace Capacitor
Warning: Ensure there are no open flame sources or hot surfaces that
exceed 1200°F in the work area.

7. Remove from capacitor strap and disconnect terminals. See Figure 511.

Warning: Discharge capacitors in a way that won’t cause any
spark. The standard procedure to short circuit the capacitor terminals usually creates sparks.

1. Remove Unit Cover. See Remove Unit Front Cover.

2. Remove Display PCB. See Replace Display PCB.

3. Remove left access panel (3 screws and a wire tie.) See Figure 506.

4. Remove PCB Access Panel. See Figure 507. a. Unplug thermostat connectors. b. Remove top screws (2 places.) c. Remove lower screws (5 places.)

5. Remove Power Cord Connector cover (3 screws.) See figure 510.

Figure 510 6. Remove right side access panel (4 screws, see figure 510.)

Figure 511

49

Unit Disassembly and Component Replacement

Replace Power PCB Warning: Ensure there are no open flame sources or hot surfaces that
exceed 1200°F in the work area.
Warning: Discharge capacitors in a way that won’t cause any
spark. The standard procedure to short circuit the capacitor terminals usually creates sparks.
1. Remove Unit Cover. See Remove Unit Front Cover. 2. Remove Display PCB. See Replace Display PCB.

11. Rotate Power PCB and separate from electrical box. See figure 513.
12. Remove 2 top screws from Power Board and separate from supporting board. See figure 512.
13. Disconnect all connectors on power PCB and reconnect on new board.
14. Screw new Power PCB to the supporting board.

3. Remove left access panel (3 screws and a wire tie.) See Figure 506.

4. Remove PCB Access Panel. See Figure 507. a. Unplug thermostat connectors. b. Remove top screws (2 places.) c. Remove lower screws (5 places.)

5. Remove Power Cord Connector cover (3 screws.) See Figure 510).

6. Remove right side access panel (4 screws.) See figure 510.

7. Cut ties (2 places.)

8. Remove electrical box from chassis by sliding up and out.

9. Remove lower panel (2 screws.) See figure 512.

10. Disconnect 2 Molex Connectors See figure 512.

Figure 512 50

Figure 513

Unit Disassembly and Component Replacement
Replace Indoor Blower, Motor, and Heater Element.
Warning: Ensure there are no open flame sources or hot surfaces that
exceed 1200°F in the work area.
Warning: Discharge capacitors in a way that won’t cause any
spark. The standard procedure to short circuit the capacitor terminals usually creates sparks.
1. Remove Unit cover. 2. Remove Display Board (See Figure 504), and separate Electrical Box from unit by removing top 2 screws (See Figure 507), disconnecting 2 molex connectors (See Figure 512), and sliding box up and out. 3. Remove screen (See Figure 513.)
screws
Screen

Figure 513 4, Remove outer support (see Figure 514.)

Figure 515 6. Remove bearing holder (See Figure 516.)

Figure 514 5. Remove baffle plate (See Figure 515.)
51

Figure 516

Unit Disassembly and Component Replacement

Replace Indoor Blower, Motor, and Heater Element.
7. Loosen blower wheel set screw through slot as shown, and slide blower wheel out. See Figure 517.

screws

motor
Figure 519 8. Remove top panel sub assy. See Figure 520.

screws

top panel sub-assy

Figure 517 8. Remove Indoor Blower Motor.
8.1 Disconnect molex connector. See Figure 518. 8.2 Remove 4 Phillips screws. See Figure 519.

Figure 520 9. Remove air duct sub assembly.

air duct sub-assy

screws

Figure 518 52

screws

Figure 521

Unit Disassembly and Component Replacement
Replace Indoor Blower, Motor, and Heater Element.
10. Remove air duct sub assembly. See Figure 522.
Blower housing screws
screws

Figure 522 11. Remove Electric heater. See Figure 523.
screws

screws

electric heater Figure 523

53

Unit Disassembly and Component Replacement

Replace Outdoor Fan blade and motor

Warning: Ensure there are no open flame sources or hot surfaces that
exceed 1200°F in the work area.

5. Remove nut on fan blade. See Figure 526. 6. Remove Outdoor Fan screws. See Figure 526.

Warning: Discharge capacitors in a way that won’t cause any
spark. The standard procedure to short circuit the capacitor terminals usually creates sparks.

1. Remove Front panel. 2. Open electrical box and disconnect wiring to outdoor fan. See Figures 503 thru 507. 3. Remove middle connection brackets. See Figure 524.

screws middle connection bracket
nut

middle connection bracket

Figure 524 4. Remove outdoor fan shroud. See Figure 525.
screws Outdoor Fan Shroud

motor

screws Figure 526

Figure 525

54

R-32 SEALED SYSTEM REPAIR
General Information
WARNING: Electrical Shock Hazard
Disconnect all power to the unit before starting maintenance. All electrical connections and wiring MUST be installed by a qualified electrician and conform to all codes which have jurisdiction. Failure to do so can result in property damage, severe electrical shock or death.

WARNING: This Product uses R-32 Refrigerant
Do not use means to accelerate the defrosting process or to clean, other than those recommended by the manufacturer.
When not installed, the appliance shall be stored in a room without continuously operating ignition sources (for example: open flames, an operating gas appliance or an operating electric heater.
Do not pierce or burn.
Be aware that refrigerants may not contain an odor.

WARNING: Refrigeration System under High pressure
Do not puncture, heat, expose to flame or incinerate. Only certified refrigeration technicians should service this equipment. R32 systems operate at higher pressures than R22 equipment. Appropriate safe service and handling practices must be used.

Warning: Prior to beginning work on systems containing FLAMMABLE REFRIGERANTS, safety checks are necessary to ensure
that the risk of ignition is minimized.
NOTICE: Individuals working on these units must be EPA 608 Certified along with A2L Refrigerant Training.
Warning: Refrigerant 32 cannot be used as a retrofit for R-410A refrigerant. The mixing of refrigerant across classes is prohibited.
R-32 Is not a drop in replacement for R-410A.
General Work Area: All maintenance staff and others working in the installation area shall be instructed on the nature of work being carried out. Work in confined spaces as defined by the Occupational Safety And Health Administration shall be avoided.
Warning: Job site should be examined for safety hazards such as flammable vapors, ignition sources, ventilation and confined
spaces. Create a safe perimeter with barriers and signs designating a flammable area.

Warning: Work shall be undertaken under a controlled procedure so as to minimise the risk of a flammable gas or vapor being
present while the work is being performed. Check for presence of refrigerant: · The area shall be checked with an appropriate refrigerant detector prior to and during work, to ensure the technician is aware of
potentially toxic or flammable atmospheres. · Ensure that the leak detection equipment being used is suitable for use with all applicable refrigerants, i.e. non-sparking, adequately
sealed or intrinsically safe. · Under no circumstances shall potential sources of ignition be used in the searching for or detection of refrigerant leaks. A halide
torch (or any other detector using a naked flame) shall not be used. · The following leak detection methods are deemed acceptable for all refrigerant systems:
1. Electronic leak detectors may be used to detect refrigerant leaks but, in the case of FLAMMABLE REFRIGERANTS, the sensitivity may not be adequate, or may need re-calibration. (Detection equipment shall be calibrated in a refrigerant-free area.) Ensure that the detector is not a potential source of ignition and is suitable for the refrigerant used. Leak detection equipment shall be set at a percentage of the LFL of the refrigerant and shall be calibrated to the refrigerant employed, and the appropriate percentage of gas (25 % maximum) is confirmed. 2. Leak detection fluids are also suitable for use with most refrigerants but the use of detergents containing chlorine shall be avoided as the chlorine may react with the refrigerant and corrode the copper pipe-work. If a leak is suspected, all flame sources shall be removed/extinguished. If a leakage of refrigerant is found which requires brazing, all of the refrigerant shall be recovered from the system, or isolated (by means of shut off valves) in a part of the system remote from the leak.

55

R-32 SEALED SYSTEM REPAIR
General Information
Presence of fire extinguisher: If any hot work is to be conducted on the refrigerating equipment or any associated parts, a class ABC Rated fire extinguishing equipment shall be available to hand. Have a class ABC Rated fire extinguisher adjacent to the charging area.
Warning:
No ignition sources: No person carrying out work in relation to a REFRIGERATING SYSTEM which involves exposing any pipe work shall use any sources of ignition in such a manner that it may lead to the risk of fire or explosion. All possible ignition sources, including cigarette smoking, should be kept sufficiently far away from the site of installation, repairing, removing and disposal, during which refrigerant can possibly be released to the surrounding space. Prior to work taking place, the area around the equipment is to be surveyed to make sure that there are no flammable hazards or ignition risks.
Ventilated Area: Ensure that the area is in the open or that it is adequately ventilated before accessing the refrigerant in the system or conducting any hot work. A degree of ventilation shall continue during the period that the work is carried out. The ventilation should safely disperse any released refrigerant away from the work area or external to building envelope.

During Repairs To Sealed Components: All power must be removed from the equipment being worked on prior to any removal of sealed covers, etc. If it is absolutely necessary to have an electrical supply to equipment during servicing, then a constant leak detector shall be located at the most critical point to warn of a potentially hazardous situation.
Checks And Repairs To Electrical Devices: · Repair and maintenance to electrical components shall include initial safety checks and component inspection procedures. If a fault exists that could
compromise safety, then no electrical supply shall be connected to the circuit until it is satisfactorily dealt with. If the fault cannot be corrected remove power supply to unit. DO NOT OPERATE. · Initial safety checks shall include:
·That capacitors are discharged: this shall be done in a safe manner to avoid possibility of sparking; ·That no live electrical components and wiring are exposed while charging, recovering or purging the system; ·Verify unit is properly grounded. · Particular attention shall be paid to the following to ensure that by working on electrical components, the casing is not altered in such a way that the level of protection is affected. This shall include damage to cables, excessive number of connections, terminals not made to original specification, damage to seals, incorrect fitting of glands, etc. · Ensure that the apparatus is mounted securely. · Ensure that seals or sealing materials have not degraded to the point that they no longer serve the purpose of preventing the ingress of flammable atmospheres. Replacement parts shall be in accordance with the manufacturer’s specifications.

The following is a list of important considerations when working with R-32 equipment: · R-32 pressure is similar to R-410A and approximately 60% higher than R-22 pressure. · R-32 cylinders must not be allowed to exceed 125°F, they may leak or rupture. · R-32 must never be pressurized with a mixture of compressed air, it may become MORE flammable. · Servicing equipment and components must be specifically designed for use with R-32 and dedicated to prevent contamination. · 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. · Gauge hoses must have a minimum 750-psig service pressure rating. · Recovery cylinders must have a minimum service pressure rating of 400 psig, (DOT 4BA400 and DOT BW400 approved cylinders). · POE (Polyol-Ester) lubricants must be used with R-32 equipment. · To prevent moisture absorption and lubricant contamination, do not leave the refrigeration system open to the atmosphere for extended periods of time. · If the system is void of refrigerant, weigh-in the refrigerant charge into the high side of the system. · If there is any amount of refrigerant in the system charge from the low side. · Always charge by liquid inverted. · For low side pressure charging of R-32, use a charging adaptor.
Verify with tool manufacturers that all tools used during this repair are non- sparking and can be used with A2L Refrigerants. No halide torches for leak testing. Refrigerant monitors or detectors must be used to detect refrigerant in the work area. R-32 E.P.A. Approved Refrigerant Recovery System.

R-32 SEALED SYSTEM REPAIR
Refrigerant Removal, Recovery, and Evacuation
NOTE: When accessing the refrigerant in the system to make repairs or for any other purpose, conventional procedures shall be used. However, for FLAMMABLE REFRIGERANTS (R-32 is classified in the A2L group for mildly flammable refrigerants) it is important that best practice is followed since flammability is a consideration. Follow all EPA 608 regulations and procedures along with AHRI 15 Best Practices for A2L refrigerants.
Warning: Ensure sufficient ventilation at the repair place. Warning: Ensure there are no open flame sources or hot surfaces that exceed 1200°F in the work area. Warning: Discharge capacitors in a way that won’t cause any spark. The standard procedure to short circuit the capacitor terminals usually
creates sparks.

NOTICE: Ensure that the following precautions are taken prior to opening the sealed system.
· Verify Recovery machine is rated for A2L refrigerants. · Mark the Job site inspection area as flammable work zone using appropriate signs. · Utilize a Refrigerant leak detector or refrigerant monitor to sense the area for the presence of refrigerants. · Disconnect all power supply to unit. · Properly ground all equipment and hoses along with tank to prevent a static build up . · Ensure adequate ventilation is provided for the job site. · Do not mix A2L refrigerant Gages and hoses with other refrigerants. · Keep exposure of refrigerant to Air to as minimum as possible (creates a dangerous condition). · Under no circumstances is the mixing of refrigerants in the recovery cylinders allowed and should be strictly avoided at all times. Do not
introduce oxygen into any recovery cylinders. 1. Install a piercing valve to recover refrigerant from the sealed system. (Piercing valve must be removed from the system before recharging.) 2. Recover refrigerant to EPA sec. 608 standards. If a low charge is suspected weigh recovered refrigerant and compare to unit nameplate. NOTE: DO NOT RECOVER TO A VACUUM PRIOR TO FLUSHING WITH NITROGEN. STOP RECOVERY AT 0-5 PSI. 3. Flush refrigerant out of system with a dry nitrogen purge, make sure you energize and de-energize all reversing valves and solenoid valves to release any trapped refrigerant.(3-5 minutes). May have to cut out parts if refrigerant is trapped. 4. Perform an evacuation to 29.9 in. hg. and break vacuum with Dry Nitrogen. 5. Re-purge the unit for 3-5 mins or until the nitrogen flows out both process tubes. 6. Re- evacuate unit to 29.9 in. hg. and break vacuum with Dry Nitrogen. 8. Open the refrigerant circuit by cutting out components. 9. Cut off the crimp on the process tubes and install a 5/16 copper access fitting to the process tube.
Transportation Be aware that local, state, and national codes exist that regulate the transportation of flammable gases. Be sure to become informed of the regulations and always stay compliant.
58

R-32 SEALED SYSTEM REPAIR
Component Replacement/Brazing · Warning: Ensure sufficient ventilation at the repair place.
Warning: Presence of fire extinguisher. If any hot work is to be conducted on the refrigerating equipment or any associated parts, have a ABC
class fire extinguisher available to hand.
Warning: No person carrying out work in relation to a REFRIGERATING SYSTEM which involves exposing any pipe work shall use any sources of ignition in
such a manner that it may lead to the risk of fire or explosion. All possible ignition sources, including cigarette smoking, should be kept sufficiently far away from the site of installation, repairing, removing and disposal, during which refrigerant can possibly be released to the surrounding space. Prior to work taking place, the area around the equipment is to be surveyed to make sure that there are no flammable hazards or ignition risks.
Warning: Ensure there are no open flame sources or hot surfaces that exceed 1200°F in the work area.
NOTE: When brazing is required, the following procedures shall be carried out in the right order: 1. Remove and recover refrigerant, and evacuate the system. Refer to the refrigerant removal, recovery, and evacuation section of this manual.
Warning: Under no circumstances shall potential sources of ignition be used in the searching for or detection of refrigerant leaks. A halide torch (or any other
detector using a naked flame) shall not be used. 2. Perform a check of the work area for the presence of flammable refrigerant prior to brazing or performing any hot work. Use a non-Sparking (Not Halide ) A2L certified Electronic Leak Detector rated for detecting R-32 refrigerant. 3. Re-pipe all repairs and install all components to sealed system.
4. Purge nitrogen through the unit. at approximately 2-3 psi through the duration of the brazing process. (Nitrogen must be purging through the unit while any brazing is being performed.) 5. Pressure test unit to 450 psi minimum and hold pressure for 30 minutes minimum. Inspect for any leaks with a leak detection fluid and repair as required. Repeat as required until system passes leak test. 6. Triple evacuate the unit to achieve a 300 micron level. 7. Pressurize nitrogen to 500 psi and leak test all connections with a leak detection fluid. Repair any leaks found. 8. Reassemble sealed enclosures accurately. If seals are worn, replace them. 9. Charge the system with the amount of refrigerant specified on the model nameplate. Refer to the refrigerant charging section of this manual for charging procedures.
59

R-32 SEALED SYSTEM REPAIRS
Refrigerant Charging

WARNING: Electrical Shock Hazard
Disconnect all power to the unit before starting maintenance. All electrical connections and wiring MUST be installed by a qualified electrician and conform to all codes which have jurisdiction. Failure to do so can result in property damage, severe electrical shock or death.

WARNING: This Product uses R-32 Refrigerant
Do not use means to accelerate the defrosting process or to clean, other than those recommended by the manufacturer.
When not installed, the appliance shall be stored in a room without continuously operating ignition sources (for example: open flames, an operating gas appliance or an operating electric heater.
Do not pierce or burn.
Be aware that refrigerants may not contain an odor.

WARNING: Refrigeration System under High pressure
Do not puncture, heat, expose to flame or incinerate. Only certified refrigeration technicians should service this equipment. R32 systems operate at higher pressures than R22 equipment. Appropriate safe service and handling practices must be used.

WARNING: Freeze Hazard

Proper safety procedures must be followed, and all PPE must be utilized when working with liquid refrigerant. Failure

to

comply could result in minor to moderate injury.

NOTE: Always weigh in refrigerant based on the model nameplate.
Warning:
· Ensure that contamination of different refrigerants does not occur when using charging equipment. · Hoses or lines shall be as short as possible to minimise the amount of refrigerant contained in them. · Charge unit with refrigerant cylinder in the inverted position to obtain liquid refrigerant. · Charge the unit according to the amount on the name plate matching the unit. · Ensure that the REFRIGERATING SYSTEM is grounded prior to charging the system with refrigerant. · Extreme care shall be taken not to overfill the REFRIGERATING SYSTEM. · Prior to recharging a system, it shall be pressure- tested with the dry nitrogen.
NOTE: Because the refrigerant system is a sealed system, service process tubes will have to be installed. First install a line tap and recover refrigerant from system. Refer to the Refrigerant removal section of this manual for procedures.
The acceptable method for charging the sealed system is the Weighed in Charge Method. The weighed in charge method is applicable to all units. It is the preferred method to use, as it is the most accurate.
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:
· Warning: Ensure sufficient ventilation at the repair place.
Warning: Ensure there are no open flame sources or hot surfaces that exceed 1200°F in the work area.
1. Recover Refrigerant in accordance with EPA regulations. (Refer to Refrigerant Removal, Recovery, and Evacuation Section).
NOTE: If a low charge is suspected weigh recovered refrigerant and compare to unit nameplate. NOTE: Access valves must be removed after charging is complete to return this unit to a sealed system.
2. Weigh in the refrigerant charge with the property quantity of R-32 refrigerant per model nameplate. 3. Crimp the process tube and solder the end shut. 4. Start unit, and verify performance. NOTE: EPA Section 608 regulations require that if a system is charge with flammable refrigerant it must have red markings on the access ports (Process tube).