Carrier 50GCQ-7-9-01SI Single Package Rooftop Heat Pump Instruction Manual

Carrier 50GCQ-7-9-01SI Single Package Rooftop Heat Pump

Product Information

Specifications

• Model Number: 04-53500399-01
• Indoor Airflow: Rated
• Country of Origin: U.S.A.
• Form No.: 50GCQ-7-9-01SI Rev. B

Product Usage Instructions

Installation

1. Jobsite Survey
2. Plan for Unit Location
3. Plan for Sequence of Unit Installation
4. Inspect Unit
5. Provide Unit Support (Slab Mount)
6. Field Fabricate Ductwork
7. Rig and Place Unit
8. Convert to Horizontal and Connect Ductwork (when required)
9. Install Outside Air Hood
10. Install External Condensate Trap and Line
11. Make Electrical Connections
12. Adjust Factory-Installed Options
13. Install Accessories
14. Fan Speed Set Up

Pre-Start and Start-Up
Refer to the START-UP CHECKLIST provided in the manual (CL-1) for detailed instructions on pre-start and start-up procedures.

SAFETY CONSIDERATIONS

Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloths for brazing operations and have a fire extinguisher available. Read the instructions thoroughly and follow all warnings or cautions attached to the unit. Consult local building codes and appropriate national electrical codes for special requirements.

Understand the signal words DANGER, WARNING, CAUTION, and NOTE. Be alert to potential personal injury when you see the safety alert symbol on the unit or in manuals.

Note: The manufacturer reserves the right to discontinue or change specifications or designs without notice.

FAQ

Q: What should I do if I encounter a safety hazard during installation?
A: Stop work immediately, ensure your safety, and address the hazard before proceeding with installation.

Q: Can I install the product without professional help?
A: It is recommended to seek professional assistance for installation to ensure proper setup and safety compliance.

WeatherMaster® 50GCQ*07-09 Single Package Rooftop Heat Pump
with Puron® (R-410A) Refrigerant and EcoBlueTM Fan Technology

Installation Instructions

SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock or other conditions which may cause personal injury or property damage. Consult a qualified installer, service agency, or your distributor or branch for information or assistance. The qualified installer or agency must use factory-authorized kits or accessories when modifying this product. Refer to the individual instructions packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloths for brazing operations and have a fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions attached to the unit. Consult local building codes and appropriate national electrical codes (in U.S.A., ANSI/NFPA70, National Electrical Code (NEC); in Canada, CSA C22.1) for special requirements.
It is important to recognize safety information. This is the safetyalert symbol . When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, CAUTION, and NOTE. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies hazards which could result in personal injury or death. CAUTION is used to identify unsafe practices, which may result in minor personal

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Catalog No. 04-53500399-01

Printed in U.S.A.

Form No. 50GCQ-7-9-01SI Rev. B

Pg 1

3-24

Replaces: New

injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation.
WARNING
Electrical shock can cause personal injury and death. Shut off all power to this equipment during installation and service. There may be more than one disconnect switch. Tag all disconnect locations to alert others not to restore power until work is completed.
WARNING
UNIT OPERATION AND SAFETY HAZARD Failure to follow this warning could cause personal injury, death and/or equipment damage. R-410A refrigerant systems operate at higher pressures than standard R-22 systems. Do not use R-22 service equipment or components on R-410A refrigerant equipment.
WARNING
PERSONAL INJURY AND ENVIRONMENTAL HAZARD Failure to follow this warning could cause personal injury or death. Relieve pressure and recover all refrigerant before system repair or final unit disposal. Wear safety glasses and gloves when handling refrigerants. Keep torches and other ignition sources away from refrigerants and oils.

CAUTION
PERSONAL INJURY HAZARD Failure to follow this caution may result in personal injury. Sheet metal parts may have sharp edges or burrs. Use care and wear appropriate protective clothing, safety glasses and gloves when handling parts and servicing air conditioning equipment.

MODEL NUMBER NOMENCLATURE AND DIMENSIONS
See Fig. 1 for 50GCQ*07-09 model number nomenclature. See Fig. 2 and 3 (pages 4 – 9) for unit dimensional drawings.
Rated Indoor Airflow
Table 1 lists the rated indoor airflow used for the AHRI efficiency rating for the units covered in this document.

Table 1 — Rated Indoor Airflow

MODEL NUMBER 50GCQ07 50GCQ08 50GCQ*09

RATED INDOOR AIRFLOW (cfm) 3000 3400 4000

2

Position: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Example: 5 0 G C Q M 0 7 A 2 A 5 – 0 A 0 A 0

Unit Type 50 ­ Cooling Unit with optional
electric heat

Packaging & Seismic Compliance 0 = Standard 1 = LTL

Model Series GC ­ High Efficiency Packaged RTU
with EcoBlueTM Technology
Electric Heat Q = Heat Pump
Refrigerant Systems Options M = Two Stage Cooling, Single Circuit
Tonnage 07 = 6.0 tons 08 = 7.5 tons 09 = 8.5 tons
Sensor Options A = None B = Return Air Smoke Detector (RA) C = Supply Air Smoke Detector (SA) D = RA + SA Smoke Detector E = CO2 Sensor F = RA Smoke Detector + CO2 Sensor G = SA Smoke Detector + CO2 Sensor H = RA + SA Smoke Detector + CO2 Sensor J = Condensate Overflow Switch (COFS) K = Condensate Overflow Switch + RA Smoke Detector L = Condensate Overflow Switch + RA and SA Smoke Detectors M = Condensate Overflow Switch + SA Smoke Detector N = Condensate Overflow Switch + CO2 Sensor P = Condensate Overflow Switch + RA Smoke and CO2 Sensor Q = Condensate Overflow Switch + SA Smoke and CO2 Sensor R = Condensate Overflow Switch + RA and SA Smoke and CO2 Sensor
Fan Options 2 = Standard/Medium Static ­ EcoBlue Vane Axial Fan 3 = High Static ­ EcoBlue Vane Axial Fan 5 = Standard/Medium Static ­ EcoBlue Vane Axial Fan and
Filter Status Switch 6 = High Static ­ EcoBlue Vane Axial Fan and Filter Status Switch
RTPF Coil Options ­ (Outdoor – Indoor – Hail Guard) A = Al/Cu – Al/Cu B = Precoat Al/Cu – Al/Cu C = E-coat Al/Cu – Al/Cu D = E-coat Al/Cu – E-coat Al/Cu E = Cu/Cu – Al/Cu F = Cu/Cu – Cu/Cu M = Al/Cu – Al/Cu — Louvered Hail Guard N = Precoat Al/Cu – Al/Cu — Louvered Hail Guard P = E-coat Al/Cu – Al/Cu — Louvered Hail Guard Q = E-coat Al/Cu – E-coat Al/Cu — Louvered Hail Guard R = Cu/Cu – Al/Cu — Louvered Hail Guard S = Cu/Cu – Cu/Cu — Louvered Hail Guard
Voltage 1 = 575/3/60 5 = 208-230/3/60 6 = 460/3/60

Electrical Options A = None B = HACR Breaker C = Non-Fused Disconnect (NFDC) D = Thru-The-Base Connections (TTB) E = HACR + TTB F = NFDC + TTB N = Phase Monitor Protection (PMR) P = PMR + HACR R = PMR + TTB S = PMR + HACR + TTB T = PMR + NFDC + TTB 1 = HSCCRa (High Short Circuit Current Rating) 2 = HSCCRa + TTB
Service Options 0 = None 1 = Unpowered Convenience Outlet (NPCO) 2 = Powered Convenience Outlet (PCO) 3 = Hinged Panels (HP) 4 = Hinged Panels + NPCO 5 = Hinged Access Panels + PCO 6 = MERV-13 Filters (M13) 7 = NPCO + MERV-13 Filters 8 = PCO + MERV-13 Filters 9 = Hinged Panels + MERV-13 Filters A = HP + NPCO + MERV-13 Filters B = HP + PCO + MERV-13 Filters C = Foil Faced Insulation (FF) D = Foil Faced Insulation + NPCO E = Foil Faced Insulation + PCO F = Foil Faced Insulation + Hinged Panels G = FF + HP + NPCO H = FF + HP + PCO J = Foil Faced Insulation + MERV-13 Filters K = FF + NPCO + MERV-13 Filters L = FF + PCO + MERV-13 Filters M = FF + HP + MERV-13 Filters N = FF + HP + NPCO + MERV-13 Filters P = FF + HP + PCO + MERV-13 Filters
Intake / Exhaust Options A = None B = Standard Leak Economizer with Barometric Relief F = Standard Leak Enthalpy Economizer with
Barometric Relief U = ULL (Ultra Low Leak) Temperature Economizer with
Barometric Relief W = ULL Enthalpy Economizer with Barometric Relief
Unit Controls 0 = Electromechanical Controller — can be used with field
installed W7212 EconoMi$er® IV (no FDDb) 3 = SystemVuTM Controller 8 = Electromechanical Controls — with POL224
EconomizerONE (includes FDDb)
Design Revision – = Factory Assigned

NOTE(S): a Not available on the following models/options:
575V, Low Ambient/Head Pressure Control, Phase Loss Monitor, Non-Fused Disconnect, HACR, Powered Convenience Outlet. b FDD (Fault Detection and Diagnostic) capability per California Title 24 section 120.2
Fig. 1 — 50GCQ 07-09 Model Number Nomenclature (Example)

3

4

Fig. 2 — 50GCQ 07-08 Unit Dimensional Drawing

5

Fig. 2 — 50GCQ 07-08 Unit Dimensional Drawing (cont)

6

Fig. 2 — 50GCQ 07-08 Unit Dimensional Drawing (cont)

7

Fig. 3 — 50GCQ 09 Unit Dimensional Drawing

8

Fig. 3 — 50GCQ 09 Unit Dimensional Drawing (cont)

9

Fig. 3 — 50GCQ 09 Unit Dimensional Drawing (cont)

INSTALLATION

Jobsite Survey
Complete the following checks before installation.
1. Consult local building codes and the NEC (National Electrical Code) ANSI/NFPA 70 for special installation requirements.
2. Determine unit location (from project plans) or select unit location.
3. Check for possible overhead obstructions which may interfere with unit lifting or rigging.
Step 1 — Plan for Unit Location
Select a location for the unit and its support system (curb or other) that provides for minimum clearances required for safety (including clearance to combustible surfaces), unit performance and service access below, around and above unit as specified in unit drawings. See Fig. 2 on page 5 or Fig. 3 on page 8.
NOTE: Consider also the effect of adjacent units.
Unit may be installed directly on wood flooring or on Class A, B, or C roof- covering material when roof curb is used.
Do not install unit in an indoor location. Do not locate air inlets near exhaust vents or other sources of contaminated air.
Although unit is weatherproof, avoid locations that permit water from higher level runoff and overhangs to fall onto unit.
Select a unit mounting system that provides adequate height to allow installation of condensate trap per requirements. Refer to Install External Condensate Trap and Line on page 15 for required trap dimensions.
ROOF MOUNT
Check building codes for weight distribution requirements. Unit operating weight is shown in Table 2.

Table 2 — Operating Weights

50GCQ*
Base Unit Economizer
Vertical Horizontal Powered Outlet Curb 14 in. (356 mm) 24 in. (610 mm)

07 805 (365)
75 (34) 122 (55) 35 (16)
143 (65) 245 (111)

UNIT LB (KG) 08
812 (368)

09 955 (433)

75 (34) 122 (55) 35 (16)

75 (34) 122 (55) 35 (16)

143 (65) 245 (111)

143 (65) 245 (111)

Step 2 — Plan for Sequence of Unit Installation
The support method used for this unit will dictate different sequences for the steps of unit installation. For example, on curbmounted units, some accessories must be installed on the unit before the unit is placed on the curb. Review the following for recommended sequences for installation steps.

CURB-MOUNTED INSTALLATION
1. Install curb 2. Install field-fabricated ductwork inside curb 3. Install accessory thru-base service connection package
(affects curb and unit) (refer to accessory installation instructions for details)

4. Prepare bottom condensate drain connection to suit planned condensate line routing (refer to Install External Condensate Trap and Line on page 15 for details)
5. Rig and place unit 6. Install outdoor air hood 7. Install condensate line trap and piping 8. Make electrical connections 9. Install other accessories

PAD-MOUNTED INSTALLATION
1. Prepare pad and unit supports 2. Check and tighten the bottom condensate drain connection
plug 3. Rig and place unit 4. Convert unit to side duct connection arrangement 5. Install field-fabricated ductwork at unit duct openings 6. Install outdoor air hood 7. Install condensate line trap and piping 8. Make electrical connections 9. Install other accessories

FRAME-MOUNTED INSTALLATION
Frame-mounted applications generally follow the sequence for a curb installation. Adapt as required to suit specific installation plan.
Step 3 — Inspect Unit
Inspect unit for transportation damage. File any claim with transportation agency.
Confirm before installation of unit that voltage, amperage and circuit protection requirements listed on unit data plate agree with power supply provided.
On units with hinged panel option, check to be sure all latches are snug and in closed position.
Locate the carton containing the outside air hood parts. Do not remove carton until unit has been rigged and located in final position.
Step 4 — Provide Unit Support

ROOF CURB MOUNT

Accessory roof curb details and dimensions are shown in Fig. 4 (on page 11). Assemble and install accessory roof curb in accordance with instructions shipped with the curb.
Curb should be level. This is necessary for unit drain to function properly. Unit leveling tolerances are shown in Fig. 5 (on page 12). Refer to Accessory Roof Curb Installation Instructions for additional information as required.
Install insulation, cant strips, roofing felt, and counter flashing as shown. Ductwork must be attached to curb and not to the unit. The accessory thru-the- base power and gas connection package must be installed before the unit is set on the roof curb.
If electric and control wiring is to be routed through the basepan, attach the accessory thru-the-base service connections to the basepan in accordance with the accessory installation instructions.
NOTE: The gasketing of the unit to the roof curb is critical for a watertight seal. Install gasket supplied with the roof curb as shown in Fig. 4. Improperly applied gasket can also result in air leaks and poor unit performance.

10

11

ROOF CURB ACCESSORY # CRRFCURB003A01
CRRFCURB004A01

6 3/64″ [153.5] 26″ [660.4] 4 3/16″ [106.0]

3″ [76.2]

15 13/16″ [401.6]

1 3/4″ [44.5]

1 3/4″ [44.5]

4 9/16″ [115.5]

1/4″ [7.0]

A
14″ [356] 24″ [610]

NOTES:

1. ROOFCURB ACCESSORY IS SHIPPED DISASSEMBLED.

2. INSULATED PANELS: 25.4 [1″] THK. POLYURETHANE FOAM, 44.5 [1-3/4] # DENSITY.

3. DIMENSIONS IN [ ] ARE IN MILLIMETERS.

4. ROOFCURB: 18 GAGE STEEL.

5. ATTACH DUCTWORK TO CURB. (FLANGES OF DUCT REST ON CURB).

6. SERVICE CLEARANCE 4 FEET ON EACH SIDE.

DIRECTION OF AIR FLOW.

8. CONNECTOR PACKAGE CRBTMPWR002A01 IS FOR THRU-THE-CURB GAS TYPE

PACKAGE CRBTMPWR004A01 IS FOR THRU-THE-BOTTOM TYPE GAS CONNECTIONS.

53 1/2″ [1358.9] 11.42″ [290.0]

14 3/4″ [374.7]

2 1/4″ [57.2]

CONNECTOR PKG. ACC. GAS CONNECTION TYPE GAS FITTING

CRBTMPWR002A01 CRBTMPWR004A01

THRU THE CURB THRU THE BOTTOM

3/4″ [19] NPT

POWER WIRING FITTING

CONTROL WIRING ACCESSORY CONVENIENCE

FITTING

OUTLET WIRING CONNECTOR

1 1/4″ [31.7] NPT

1/2″ [12.7] NPT

1/2″ [12.7] NPT

1 3/4″ [44.5] “A”

1.00″ [25.4]

12-1/2″ [317.5] WIDE INSULATED DECK PANELS

32 9/16″ [827.1] SUPPLY AIR OPENING
31 17/32″ [800.9]

1 3/4″ [44.4]

1 3/4″ [44.4] SECTION THRU SIDE

81 3/4″ [2076.3] 40 3/16″ [1020.8] RETURN AIR 23 1/16″ OPENING [585.8]

VIEW “B”
CORNER DETAIL

15 15/32 [392.9]

GASKET (SUPPLIED WITH CURB)
DUCT (FIELD SUPPLIED)

UNIT

7/16″ [11]

NAIL (FIELD SUPPLIED) TYPICAL (4) SIDES
COUNTER FLASHING (FIELD SUPPLIED)

ROOFING FELT (FIELD SUPPLIED)
CANT STRIP (FIELD SUPPLIED)
ROOFING MATERIAL (FIELD SUPPLIED)

9-15/16″ [252.4] WIDE INSULATED DECK PANEL
GAS SERVICE PLATE THRU THE CURB DRILL HOLE 2″ [50.8] @ ASSEMBLY (IF REQUIRED) (SEE NOTE #8)
SUPPLY AIR
“A”
4′ 2″ [1270.0] SEE VIEW “B”

SUPPLY AIR

RETURN AIR

RIGID INSULATION (FIELD SUPPLIED)

20-3/4″ [513] INSIDE
2-3/8″ [61]

SEE NOTE #2

RETURN AIR

6′ 6-1/4″ [1987.5]

1-3/4″ TYP [44.5]

THIS DOCUMENT AND THE INFORMATION CONTAINED THEREIN IS PROPRIETARY TO CARRIER CORPORATION AND SHALL NOT BE USED OR DISCLOSED TO OTHERS, IN WHOLE OR IN PART, WITHOUT THE WRITTEN AUTHORIZATION OF CARRIER CORPORATION.
TITLE
CURB ASY, ROOF

DRAWING NUMBER

REV

50HJ405012

C

Fig. 4 — Roof Curb Details

C

A

B

MAXIMUM ALLOWABLE DIFFERENCE in. (mm)

A-B

B-C

A-C

0.5 (13)

1.0 (25)

1.0 (25)

Fig. 5 — Unit Leveling Tolerances
SLAB MOUNT (HORIZONTAL UNITS ONLY)
Provide a level concrete slab that extends a minimum of 6 in. (150 mm) beyond unit cabinet. Install a gravel apron in front of condenser coil air inlet to prevent grass and foliage from obstructing airflow.
NOTE: Horizontal units may be installed on a roof curb if required.
ALTERNATE UNIT SUPPORT (IN LIEU OF CURB OR SLAB MOUNT)
A non-combustible sleeper rail can be used in the unit curb support area. If sleeper rails cannot be used, support the long sides of the unit with a minimum of 3 equally spaced 4 in. x 4 in. (102 mm x 102 mm) pads on each side.
Step 5 — Field Fabricate Ductwork
Cabinet return-air static pressure (a negative condition) shall not exceed 0.35 in. wg (87 Pa) with economizer or 0.45 in. wg (112 Pa) without economizer.
For vertical ducted applications, secure all ducts to roof curb and building structure. Do not connect ductwork to unit.
Fabricate supply ductwork so that the cross sectional dimensions are equal to or greater than the unit supply duct opening dimensions for the first 18 in. (458 mm) of duct length from the unit basepan.
Insulate and weatherproof all external ductwork, joints, and roof openings with counter flashing and mastic in accordance with applicable codes.
Ducts passing through unconditioned spaces must be insulated and covered with a vapor barrier.
If a plenum return is used on a vertical unit, the return should be ducted through the roof deck to comply with applicable fire codes.

CAUTION
PROPERTY DAMAGE HAZARD Failure to follow this caution may result in damage to roofing materials. Membrane roofs can be cut by sharp sheet metal edges. Be careful when placing any sheet metal parts on such roof.

FOR UNITS WITH ACCESSORY ELECTRIC HEATERS
All installations require a minimum clearance to combustible surfaces of 1 in. (25 mm) from duct for first 12 in. (305 mm) away from unit. Outlet grilles must not lie directly below unit discharge.
WARNING
PERSONAL INJURY HAZARD Failure to follow this warning could cause personal injury. For vertical supply and return units, tools or parts could drop into ductwork and cause an injury. Install a 90 degree turn in the return ductwork between the unit and the conditioned space. If a 90 degree elbow cannot be installed, then a grille of sufficient strength and density should be installed to prevent objects from falling into the conditioned space. Due to electric heater, supply duct will require 90 degree elbow.
Step 6 — Rig and Place Unit
Keep unit upright and do not drop. Spreader bars are required. Rollers may be used to move unit across a roof. Level by using unit frame as a reference. See 2 and Fig. 6 on page 13 for additional information. Lifting holes are provided in base rails as shown in Fig. 6. Refer to rigging instructions on unit. Rigging materials under unit (cardboard or wood to prevent base pan damage) must be removed PRIOR to placing the unit on the roof curb. When using the standard side drain connection, ensure the red plug in the alternate bottom connection is tight. Do this before setting the unit in place. The red drain pan can be tightened with a 1/ 2 in. square socket drive extension. For further details see Install External Condensate Trap and Line on page 15. Before setting the unit onto the curb, recheck gasketing on curb.
CAUTION
UNIT DAMAGE HAZARD Failure to follow this caution may result in equipment damage. All panels must be in place when rigging. Unit is not designed for handling by fork truck when packaging is removed. If using top crate as spreader bar, once unit is set, carefully lower wooden crate off building roof top to ground. Ensure that no people or obstructions are below prior to lowering the crate.
POSITIONING ON CURB
Position unit on roof curb so that the following clearances are maintained: 1/4 in. (6.4 mm) clearance between the roof curb and the base rail inside the front and back, 0.0 in. clearance between the roof curb and the base rail inside on the duct end of the unit. This will result in the distance between the roof curb and the base rail inside on the condenser end of the unit being approximately 1/ 4 in. (6.4 mm). Although unit is weatherproof, guard against water from higher level runoff and overhangs. After unit is in position, remove rigging skids and shipping materials.

12

“B” Required Spreader
Bars

36-54 in. (914-1371 mm)

Place all seal strips in place before placing unit on roof curb
Duct End

Detail “A”

“C”

Fan Side

“A” See Detail “A”

NOTE(S): 1. SPREADER BARS ARE REQUIRED. Top damage will occur if spreader bars are not used. 2. Hook rigging shackles through holes in base rail, as shown in Detail A. Holes in base rails are centered around the unit center
of gravity. Use wooden top to prevent rigging straps from damaging unit.

UNIT
50GCQ07 50GCQ08 50GCQ*09

MAX WEIGHT

lb

kg

1285

583

1341

608

1526

692

A

in.

mm

88.0

2235

88.0

2235

88.0

2235

DIMENSIONS

B

in.

mm

59.5

1510

59.5

1510

59.5

1510

C

in.

mm

49.5

1255

49.5

1255

49.5

1255

Fig. 6 — Rigging Details

Step 7 — Convert to Horizontal and Connect Ductwork (when required)
Unit is shipped in the vertical duct configuration. Unit without factory- installed economizer or return-air smoke detector option may be field- converted to horizontal ducted configuration. To convert to horizontal configuration, remove screws from side duct opening covers (see Fig. 7) and remove covers. Use the screws to install the covers on vertical duct openings with the insulation-side down. The panels must be inserted into the notches on the basepan to properly seal. The notches are covered by the tape used to secure the insulation to the basepan and are not easily seen. See Fig. 8 for position of the notches in the basepan. Seals around duct openings must be tight. Secure with screws as shown in Fig. 9. Cover seams with foil duct tape.
Field-supplied flanges should be attached to horizontal duct openings and all ductwork should be secured to the flanges. Insulate and weatherproof all external ductwork, joints, and roof or building openings with counter flashing and mastic in accordance with applicable codes.
Do not cover or obscure visibility to the unit’s informative data plate when insulating horizontal ductwork.
Removable Horizontal Return Duct Opening Cover

Notches

Notches

Basepan
Fig. 8 — Location of Notches
Screws

Duct Covers Sheet Metal Face Up

Removable Horizontal Supply Duct Opening Cover
Fig. 7 — Horizontal Conversion Panels

Basepan
Fig. 9 — Horizontal Duct Panels In Place 13

Step 8 — Install Outside Air Hood
ECONOMIZER HOOD PACKAGE REMOVAL
(FACTORY OPTION)
1. The hood is shipped in knock-down form and must be field assembled. The indoor coil access panel is used as the hood top while the hood sides, divider and filter are packaged together, attached to a metal support tray using plastic stretch wrap, and shipped in the return air compartment behind the indoor coil access panel. The hood assembly’s metal tray is attached to the basepan and also attached to the damper using two plastic tie-wraps.
2. To gain access to the hood, remove the filter access panel. (See Fig. 10.)

ECONOMIZER HOOD SETUP NOTE: If the power exhaust accessory is to be installed on the unit, the hood shipped with the unit will not be used and must be discarded. Save the aluminum filter for use in the power exhaust hood assembly. 1. The indoor coil access panel will be used as the top of the
hood. Remove the screws along the sides and bottom of the indoor coil access panel. See Fig. 12.
Top Panel

Filter Access Panel Indoor Coil Access Panel
Fig. 10 — Typical Access Panel Locations 3. Locate the (2) screws holding the metal tray to the basepan
and remove. Locate and cut the (2) plastic tie-wraps securing the assembly to the damper. (See Fig. 11.) Be careful to not damage any wiring or cut tie- wraps securing any wiring.
Hood Parts
Plastic Tie Wrap Qty (2)
Screws for Metal Tray Qty (2)
Fig. 11 — Economizer Hood Parts Location 4. Carefully lift the hood assembly (with metal tray) through
the filter access opening and assemble per the steps outlined in Economizer Hood Setup in the following section.

Indoor Coil Access Panel

Caulk Here

Top Panel
Indoor Coil Access Panel

Fig. 12 — Indoor Coil Access Panel Relocation

2. Swing out indoor coil access panel and insert the hood sides under the panel (hood top). Use the screws provided to attach the hood sides to the hood top. Use screws provided to attach the hood sides to the unit. See Fig. 13.

Top Panel
Indoor Coil Access Panel

Left Hood Side
19-1/16 in. (483mm)

Screw

33-3/8 in. (848mm)
Hood Divider
Fig. 13 — Economizer Hood Construction
3. Remove the shipping tape holding the economizer barometric relief damper in place (economizer only).
4. Insert the hood divider between the hood sides. See Fig. 13 and 14. Secure hood divider with 2 screws on each hood side. The hood divider is also used as the bottom filter rack for the aluminum filter.
5. Open the filter clips which are located underneath the hood top. Insert the aluminum filter into the bottom filter rack (hood divider). Push the filter into position past the open filter clips. Close the filter clips to lock the filter into place. See Fig. 14.
6. Caulk the ends of the joint between the unit top panel and the hood top.
7. Replace the filter access panel.

14

Divider

Outside Air
Hood

Barometric Relief

Cleanable Aluminum Filter Filter

Filter Clip

Fig. 14 — Economizer Filter Installation

Step 9 — Install External Condensate Trap and Line
The unit has one 3/4 in. condensate drain connection on the end of the condensate pan and an alternate connection on the bottom. See Fig. 15. Unit airflow configuration does not determine which drain connection to use. Either drain connection can be used with vertical or horizontal applications.

Condensate Pan (Side View)

Standard Side Drain

Drain Plug (Factory-Installed)

Alternate Bottom Drain

Fig. 15 — Condensate Drain Pan (Side View)

To use the alternate bottom drain connection, remove the red drain plug from the bottom connection (use a 1/2 in. square socket drive extension) and install it in the side drain connection.
The piping for the condensate drain and external trap can be completed after the unit is in place. See Fig. 16.
NOTE: If the alternate bottom drain is not used check the drain plug for tightness prior to setting the unit on the roof curb.

Minimum Pitch 1 in. (25 mm) Per 10 ft (3 m) of Line

Base Rail
3 in. (76 mm) Open Min Vent

To Roof Drain

See Note

Drain Plug

Roof Curb

NOTE: Trap should be deep enough to offset maximum unit static difference. A 4 in. (102 mm) trap is recommended.

Fig. 16 — Condensate Drain Piping Details

All units must have an external trap for condensate drainage. Install a trap at least 4 in. (102 mm) deep and protect against freezeup. If drain line is installed downstream from the external trap, pitch the line away from the unit at 1 in. per 10 ft (25 mm in 3 m) of run. Do not use a pipe size smaller than the unit connection (3/ 4 in.).
Step 10 — Make Electrical Connections

WARNING
ELECTRIC SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
Unit cabinet must have an uninterrupted, unbroken electrical ground to minimize the possibility of personal injury if an electrical fault should occur. This ground may consist of electrical wire connected to unit ground lug in control compartment, or conduit approved for electrical ground when installed in accordance with NEC; ANSI/NFPA 70, latest edition (in Canada, Canadian Electrical Code CSA [Canadian Standards Association] C22.1), and local electrical codes.
NOTE: Field-supplied wiring shall conform with the limitations of minimum 63°F (33°C) rise.
FIELD POWER SUPPLY
If equipped with optional powered convenience outlet: The power source leads to the convenience outlet’s transformer primary are not factory connected. Installer must connect these leads according to required operation of the convenience outlet. If an alwaysenergized convenience outlet operation is desired, connect the source leads to the line side of the unit-mounted disconnect. (Check with local codes to ensure this method is acceptable in your area.) If a de-energize via unit disconnect switch operation of the convenience outlet is desired, connect the source leads to the load side of the unit disconnect. On a unit without a unit-mounted disconnect, connect the source leads to compressor contactor C and indoor fan contactor IFC pressure lugs with unit field power leads (see Fig. 17).
Field power wires will be connected at the line-side pressure lugs on the power terminal block or at factory-installed option nonfused disconnect or HACR.

15

Units Without Single Point Box, Disconnect or HACR Option

TB

11

12

13

Disconnect per NEC
L1 L2 L3 208/230-3-60
460-3-60 575-3-60
Units With Disconnect or HACR Option

L1

2

L2

4

3 Phase Only

L3

6

Optional Disconnect
Switch

1
3 3 Phase Only Factory Wiring
5

Ground (GR)

Equip GR Lug Disconnect factory test leads; discard.

Units With Electric Heat Option with Single Point Box and Without Disconnect or HACR Option
Single Point Box
Terminal Block
L1

L2 Factory Wiring
L3

Ground (GR) L1

Equip GR Lug
— OR —
Single Point Box
Fuse/Terminal Block Fuse

L2

Fuse

L3

Fuse

Factory Wiring

Ground (GR)

Equip GR Lug

Fig. 17 — Power Wiring Connections

FIELD POWER WIRING CONNECTIONS

Field power wires are connected to the unit at line-side pressure lugs on compressor contactor C and indoor fan contactor IFC (see wiring diagram label for control box component arrangement), or at factory-installed option non- fused disconnect switch or HACR or electric heat single point box. Max wire size is no. 4ga AWG (copper only) per pole on contactors, no. 4ga AWG (copper only) or 1/0 AWG (copper only) per pole on optional disconnect (max wire size depends on the disconnect size supplied with unit), 1/0 AWG (copper only) on optional HACR and 4/0 AWG (copper only) per pole on terminal or fuse block on units with single point box. See Fig. 17 and unit label diagram for field power wiring connections.

Refer to Table 3 for maximum wire sizes at connection lugs Use copper wire only. See Fig. 17 and 18. NOTE: TEST LEADS – Unit may be equipped with short leads (pigtails) on the field line connection points on contactor C or optional disconnect switch. These leads are for factory run-test purposes only; remove and discard before connecting field power wires to unit connection points. Make field power connections directly to line connection pressure lugs only.
WARNING
FIRE HAZARD Failure to follow this warning could result in personal injury, death, or property damage. Do not connect aluminum wire between disconnect switch and unit. Use only copper wire.

Electric Disconnect
Switch

Copper Wire Only

Aluminum Wire

Fig. 18 — Disconnect Switch and Unit

Table 3 — Connection Lug Min/Max Wire Sizes

TB1 In Unit Control Box 80A Disconnect Option 100A Disconnect Option

Minimum #14 #14 #8

Maximum #1 #4 1/0

UNITS WITH FACTORY-INSTALLED NON-FUSED DISCONNECT OR HACR
The factory-installed option non-fused disconnect (NFD) (see Fig. 19) or HACR (see Fig. 20) switch is located in a weatherproof enclosure located under the main control box. The manual switch handle and shaft are shipped in the disconnect or HACR enclosure. Assemble the shaft and handle to the switch at this point. Discard the factory test leads (see Fig. 17). Connect field power supply conductors to LINE side terminals when the switch enclosure cover is removed to attach the handle.
Connect field power supply conductors to LINE side terminals when the switch enclosure cover is removed to attach the handle.

BLK YEL BLU
Fig. 19 — Location of Non-Fused Disconnect Enclosure

16

Fig. 20 — Location of HACR Circuit Breaker Enclosure
To field install the NFD shaft and handle (see Fig. 21): 1. Remove the unit front panel (see Fig. 2 and 3). 2. Remove (3) hex screws on the NFD enclosure – (2) on the
face of the cover and (1) on the left side cover. 3. Remove the front cover of the NFD enclosure. 4. Make sure the NFD shipped from the factory is at OFF posi-
tion (the arrow on the black handle knob is at OFF). 5. Insert the shaft with the cross pin on the top of the shaft in the
horizontal position. 6. Measure from the tip of the shaft to the top surface of the
black pointer; the measurement should be 3.75-in. to 3.88-in. (95mm to 99mm). 7. Tighten the locking screw to secure the shaft to the NFD. 8. Turn the handle to the OFF position with red arrow pointing to OFF. 9. Install the handle on to the painted cover horizontally with the red arrow pointing to the left. 10. Secure the handle to the painted cover with (2) screws and lock washers supplied. 11. Engaging the shaft into the handle socket, re-install (3) hex screws on the NFD enclosure. 12. Re-install the unit front panel.
Fig. 21 — Handle and Shaft Assembly for NFD To field install the HACR circuit breaker shaft and handle (see Fig. 22): 1. Remove the unit front panel (see Fig. 2 or Fig. 3).

2. Remove (3) hex screws on the HACR enclosure – (2) on the face of the cover and (1) on the left side cover.
3. Remove the front cover of the HACR enclosure. 4. Make sure the HACR circuit breaker shipped from the fac-
tory is at OFF position (the white arrow pointing at OFF). 5. Insert the shaft all the way with the cross pin on the top of the
shaft in the horizontal position. 6. Tighten the locking screw to secure the shaft to the HACR
circuit breaker. 7. Turn the handle to the OFF position with red arrow pointing
at OFF. 8. Install the handle on to the painted cover horizontally with the
red arrow pointing to the left. 9. Secure the handle to the painted cover with (2) screws and
lock washers supplied. 10. Engaging the shaft into the handle socket, re- install (3) hex
screws on the HACR circuit breaker enclosure. 11. Re-install the unit front panel.
Fig. 22 — Handle and Shaft Assembly for HACR Circuit Breaker
UNITS WITHOUT FACTORY-INSTALLED NON-FUSED DISCONNECT OR HACR CIRCUIT BREAKER When installing units, provide a disconnect switch per NEC (National Electrical Code) of adequate size. Disconnect sizing data is provided on the unit informative plate. Locate on unit cabinet or within sight of the unit per national or local codes. Do not cover unit informative plate if mounting the disconnect on the unit cabinet. FIELD WIRING COMPLIANCE All field wiring must comply with NEC and all local code requirements. Size wire based on MCA (Minimum Circuit Amps) on the unit informative plate. See Fig. 17 and unit label diagram for power wiring connections to the unit and equipment ground. Maximum wire size is no. 4 ga AWG (copper only) per pole on contactors and no. 2ga AWG (copper only) per pole on optional non-fused disconnect or HACR. Provide a ground-fault and short-circuit over-current protection device (fuse or breaker) per NEC Article 440 (or local codes). Refer to unit informative data plate for MOCP (Maximum Overcurrent Protection) device size. NOTE: Units ordered with factory-installed HACR do not need an additional ground-fault and short-circuit over-current protective device unless required by local codes.

17

All units except 208/230-v units are factory wired for the voltage shown on the nameplate. If the 208/230-v unit is to be connected to a 208-v power supply, the control transformer must be rewired by moving the black wire with the 1/4-in. female spade connector from the 230-v connection and moving it to the 200-v 1/4-in. male terminal on the primary side of the transformer. Refer to unit label diagram for additional information.
Voltage to compressor terminals during operation must be within voltage range indicated on unit nameplate. On 3-phase units, voltages between phases must be balanced within 2% and the current within 10%. Use the following formula to determine the percent of voltage imbalance. Operation on improper line voltage or excessive phase imbalance constitutes abuse and may cause damage to electrical components. Such operation would invalidate any applicable Carrier warranty.
CONVENIENCE OUTLETS

WARNING

ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal injury or death.
Units with convenience outlet circuits may use multiple disconnects. Check convenience outlet for power status before opening unit for service. Locate its disconnect switch, if appropriate, and open it. Lock-out and tag-out this switch, if necessary.

Two types of convenience outlets are offered on 50GCQ models: non-powered and unit-powered. Both types provide a 125-v GFCI (ground-fault circuit- interrupter) duplex receptacle rated at 15-A behind a hinged waterproof access cover, located on the end panel of the unit. See Fig. 23.
Installing Weatherproof Cover
A weatherproof cover is now required by UL standards for the factory-installed convenience outlets. This cover cannot be factory-mounted due to its depth; it must be installed at unit installation. For shipment, the convenience outlet is covered with a blank cover plate.

Convenience Outlet GFCI

Pwrd-Co Transformer

Pwrd-Co Fuse Switch

Control Box Access Panel
Fig. 23 — Convenience Outlet Location
On units with electro-mechanical controls the weatherproof cover kit is shipped in the unit’s control box. The kit includes the hinged cover, a backing plate and gasket. On units with a factory installed direct digital controller (SystemVuTM controls) the weatherproof cover kit is secured to the basepan underneath the control box. See Fig. 24.

Weatherproof Cover

Fig. 24 — Weatherproof Cover – Shipping Location on Units with Factory- Installed DDC

Disconnect All Power To Unit and Convenience Outlet. LockOut and Tag-Out All Power.
Remove the blank cover plate at the convenience outlet; discard the blank cover.
Loosen the two screws at the GFCI duplex outlet, until approximately 1/2-in. (13 mm) under screw heads is exposed. Press the gasket over the screw heads. Slip the backing plate over the screw heads at the keyhole slots and align with the gasket; tighten the two screws until snug (do not over-tighten).
Mount the weatherproof cover to the backing plate as shown in Fig. 25. Remove two slot fillers in the bottom of the cover to permit service tool cords to exit the cover. Check for full closing and latching.

Cover — While-In-Use Weatherproof

GFCI Receptacle Not Included

TOP

TOP

TOP
WET LOCATIONS

WET LOCATIONS

Gasket

Baseplate For GFCI Receptacle
Fig. 25 — Weatherproof Cover Installation
Non-powered type
Requires the field installation of a general-purpose 125-v 15-A circuit powered from a source elsewhere in the building. Observe national and local codes when selecting wire size, fuse or breaker requirements and disconnect switch size and location. Route 125-v power supply conductors into the bottom of the utility box containing the duplex receptacle.
Unit-powered type
A unit-mounted transformer is factory-installed to step-down the main power supply voltage to the unit to 115-v at the duplex receptacle. This option also includes a manual switch with fuse, located in a utility box and mounted on a bracket behind the convenience outlet; access is through the unit’s control box access panel. See Fig. 23.

18

The primary leads to the convenience outlet transformer are not factory- connected. Selection of primary power source is a customer option. If local codes permit, the transformer primary leads can be connected at the line-side terminals on the unitmounted non-fused disconnect; this will provide service power to the unit when the unit disconnect witch is open. Other connection methods will result in the convenience outlet circuit being de-energized when the unit disconnect switch is open. See Fig 26. On a unit without a unit- mounted disconnect, connect the source leads to the main terminal block (TB1).

HACR that was shipped with the unit from the factory (Fig. 28). See unit nameplates for the proper fuse, HACR or maximum over-current protection device required on the unit with field installed accessories.

Fig. 27 — Convenience Outlet Utilization Notice Label

UNIT VOLTAGE 208, 230
460
575

CONNECT AS 240
480
600

PRIMARY CONNECTIONS
L1: RED+YEL L2: BLU+YEL
L1: RED Splice BLU+YEL L2: GRA
L1: RED L2: GRA

TRANSFORMER TERMINALS
H1+H3 H2+H4
H1 H2+H3
H4
H1 H2

Fig. 26 — Powered Convenience Outlet Wiring

ALL UNITS
Test the GFCI receptacle by pressing the TEST button on the face of the receptacle to trip and open the receptacle. Check for proper grounding wires and power line phasing if the GFCI receptacle does not trip as required. Press the RESET button to clear the tripped condition.
Unit-mounted convenience outlets
Outlets will often require that two disconnects be opened to de-energize all power to the unit. Treat all units as electrically energized until the convenience outlet power is also checked and de-energization is confirmed. Observe National Electrical Code Article 210, Branch Circuits, for use of convenience outlets.
Fuse on power type
The factory fuse is a BussmannTM1 “Fusetron” T-15, nonrenewable screw-in (Edison base) type plug fuse. See Fig. 27 for maximum continuous use amp limitations.

HACR AMP RATING
The amp rating of the HACR factory-installed option is based on the size, voltage, indoor motor and other electrical options of the unit as shipped from the factory. If field-installed accessories are added or changed in the field (for example, power exhaust, ERV), the HACR may no longer be of the proper amp rating and therefore will need to be removed from the unit. See unit nameplate and label on factory-installed HACR for the amp rating of the

1. Third-party trademarks and logos are the property of their respective owners.

Fig. 28 — HACR Caution Label FACTORY-OPTION THRU-BASE CONNECTIONS This service connection kit consists of a a 1/2 in. electrical bulkhead connector and a 3/4 in. electrical bulkhead connector, factory-installed in the embossed (raised) section of the unit basepan in the condenser section. The 3/4 in. bulkhead connector enables the low-voltage control wires to pass through the basepan. The 1/2 in. electrical bulkhead connector allows the high-voltage power wires to pass through the basepan. See Fig. 29.
Low Voltage Conduit Connector
High Voltage Conduit Connector
Fig. 29 — Thru-Base Connection Fittings Check tightness of connector lock nuts before connecting electrical conduits. Field-supplied and field-installed liquid tight conduit connectors and conduit may be attached to the connectors on the basepan. Pull correctly rated high voltage through appropriate conduits. Connect the power conduit to the internal disconnect (if unit is so equipped) or to the external disconnect (through unit side panel). A hole must be field cut in the main control box bottom on the left

19

side so the 24-v control connections can be made. Connect the control power conduit to the unit control box at this hole.
Units Without Thru- Base Connections
1. Install power wiring conduit through side panel openings.
Install conduit between disconnect and control box.
2. Install power lines to terminal connections as shown in
Fig. 26.
Voltage to compressor terminals during operation must be within voltage range indicated on unit nameplate. On 3-phase units, voltages between phases must be balanced within 2% and the current within 10%. Use the formula on page 18 to determine the percent of voltage imbalance. Operation on improper line voltage or excessive phase imbalance constitutes abuse and may cause damage to electrical components. Such operation would invalidate any applicable Carrier warranty.
Field Control Wiring
The 50GCQ unit requires an external temperature control device. This device can be a thermostat (field-supplied) or a SystemVuTM controller (available as factory-installed option, for use on a Carrier Comfort Network® or as a stand- alone control). All field added wire must comply with UL and local NEC standards. Use raceway shown in Fig. 31 to help with compliance as needed.
All low voltage wiring should be routed through the provided raceway (see Fig. 31) built into the corner post of the unit or secured to the unit control box with electrical conduit in order to provide UL-required clearance between high-voltage and low-voltage wiring.
Thermostat
Install a Carrier-approved accessory 2-stage thermostat according to installation instructions included with the accessory. For complete economizer function and 2-stage compressor operation, select a two-stage cooling thermostat. If a 2-stage cooling thermostat is not available, use a single stage cooling thermostat instead, but note that this will limit cooling to just 1 stage. Locate the thermostat accessory on a solid wall in the conditioned space to sense average temperature in accordance with the thermostat installation instructions. If the thermostat contains a logic circuit requiring 24-v power, use a thermostat cable or equivalent single leads of different colors with minimum of seven leads (see Fig. 30). If the thermostat does not require a 24-v source (no “C” connection required), use a thermostat cable or equivalent with minimum of six leads. Check the thermostat installation instructions for additional features which might require additional conductors in the cable. For wire runs up to 50 ft (15 m), use no. 18 AWG (American Wire Gauge) insulated wire [35°C (95°F) minimum]. For 50 to 75 ft (15 to 23 m), use no. 16 AWG insulated wire [35°C (95°F) minimum]. For over 75 ft (23 m), use no. 14 AWG insulated wire [35°C (95°F) minimum]. All wire sizes larger than no. 18 AWG cannot be directly connected to the thermostat and will require a junction box and splice at the thermostat.

Typical Thermostat Connections
C

G
W2
W1 O/B/Y2
(Note 1)
Y1
R

(Note 2)

Unit Control Board
C

HUM T

G

H

E

W2

R

M

W1

O S

T

Y2

A

T Y1

R

Note 1: Typical multi-function marking. Follow manufacturer’s configuration Instructions to select Y2.
Note 2: Y2 to Y2 connection required on single-stage cooling units when integrated economizer function is desired.
Field Wiring
Fig. 30 — Low-Voltage Connections
Unit Without Thru-Base Connection Kit Pass the thermostat control wires through the hole provided in the corner post; then feed the wires through the raceway built into the corner post to the control box. Pull the wires over to the terminal strip on the upper-left corner of the Controls Connection Board. See Fig. 31.
Raceway

Hole In End Panel (Hidden)
Fig. 31 — Field Control Wiring Raceway
NOTE: If thru-the-bottom connections accessory is used, refer to the accessory installation instructions for information on routing power and control wiring.

20

COMMERCIAL DEFROST CONTROL
On 50GCQ units equipped with electro-mechanical controls the Defrost Control Board (DFB) coordinates thermostat demands for supply fan control, 1 or 2 stage cooling, 2 stage heating, emergency heating and defrost control with unit operating sequences. The DFB also provides an indoor fan off delay feature (user selectable). See Fig. 32 for board arrangement.
The DFB is located in the main control box of the 50GCQ unit (see Fig. 33). All connections are factory-made through harnesses to the UCB (unit control board) to the ECM (direct-drive motor), reversing valve solenoids and to defrost thermostats. Refer to Table 4 for details of DFB Inputs and Outputs.
NOTE: The Defrost Control Board is not used on units equipped with the factory-installed SystemVuTM controller option.

DIP Switches
Speed-Up Jumpers
Fig. 32 — Defrost Control Board Arrangement

Fig. 33 — Defrost Control Board Location – 50GCQ 07-08 Electro-Mechanical Units Shown

Table 4 — 50GCQ Defrost Board I/O and Jumper Configurations

POINT NAME INPUTS
G Fan Y1 Cool 1 Y2 Cool 2 W1 Heat 1 W2 Heat 2 R Power C Common
DFT 1 DFT 2 OUTPUTS IFO Fan On OF OD Fan On RVS1 RVS2 COMP 1 COMP2 HEAT 2 COM CONFIGURATION Select Jumper SPEED-UP CONFIGURATION Speed-Up Jumper Speed-Up Jumper

TYPE OF I/O
DI, 24 vac DI, 24 vac DI, 24 vac DI, 24 vac DI, 24 vac
24 vac 24 vac DI, 24 vac DI, 24 vac
DO, 24 vac DO, 24 vac DO, 24 vac DO, 24 vac DO, 24 vac DO, 24 vac DO, 24 vac
24 vac
24 vac
— —

CONNECTION PIN NUMBER

P2-3 P2-5 P2-4 P2-7 P2-6 P3-1 P3-2 DFT-1 to DFT-1 DFT-2 to DFT-2
P3-9 OF P3-7 to P3-5 P3-6 to P3-4 P3-10 P3-8 E-HEAT P3-3
P1-1
JMP17 JMP18

UNIT CONNECTION
CTB-G CTB-Y1 CTB-Y2 CTB-W1 CTB-W2 CONTL BRD-8 CONTL BRD-4
— —
REHEAT/HP-2 OFR — —
FPT1-REHEAT/HP-6 FPT2-REHEAT/HP-8
TB4-1 TB4-3
—
— —

NOTE
Energize in COOL Energize in COOL

NOTES:
1. Jumper for 1-3 seconds: Factory Test — The defrost interval timing is reduced by a factor of 0.1 seconds/minute based on the positions of DIP switches SW1 and SW2 (i.e., 90 minutes will be reduced to 9 seconds).
2. Jumper for 5-20 seconds: Forced Defrost — Defrost runs for 30 seconds if DFT2 is open.

21

Reversing Valve Control
The DFB has two outputs for unit reversing valve control. Operation of the reversing valves is based on internal logic; this application does not use an “O” or “B” signal to determine reversing valve position. Reversing valves are energized during the cooling stages and the defrost cycle and de-energized during heating cycles. Once energized at the start of a cooling stage, the reversing valve will remain energized until the next heating cycle demand is received. Once de-energized at the start of a Heating cycle, the reversing valves will remain de-energized until the next cooling stage is initiated.
Compressor Control
The DFB receives inputs indicating Stage 1 Cooling, Stage 2 Cooling and Stage 1 Heating from the space thermostat or unit control system (SystemVuTM controller); it generates commands to start compressors with or without reversing valve operation to produce Stage 1 Cooling (one compressor runs), Stage 2 Cooling (both compressors run) or Stage 1 Heating (both compressors run).
Auxiliary (Electric) Heat Control
The 50GCQ unit can be equipped with one or two auxiliary electric heaters, to provide a second stage of heating. The DFB will energize this Heating System for a Stage 2 Heating Command (heaters operate concurrently with compressor(s) in the Stage 1 Heating cycle), for an Emergency Heating sequence (compressors are off and only the electric heaters are energized) and also during the Defrost cycle (to eliminate a “cold blow” condition in the space).
Defrost
The defrost control mode is a time/temperature sequence. There are two time components: The continuous run period and the test/ defrost cycle period. The temperature component is provided by Defrost Thermostat 1 and 2 (DFT1 and DFT2) mounted on the outdoor coil.
The continuous run period is a fixed time period between the end of the last defrost cycle (or start of the current Heating cycle) during which no defrost will be permitted. This period can be set at 30, 60, 90 or 120 minutes by changing the positions of DIP switches SW1 and SW2 (see Fig. 34 and Table 5). The default run period is 30 minutes.

Shorting the jumpers for a period of 5 to 20 seconds bypasses the remaining continuous run period and places the unit in a Forced Defrost mode. If the controlling DFT is closed when this mode is initiated, the unit will complete a normal defrost period that will terminate when the controlling DFT opens or the 10 minute defrost cycle limit is reached. If the controlling DFT is open when this mode is initiated, the Defrost cycle will run for 30 seconds. Both modes end at the end of the Defrost cycle.
HEAT ANTICIPATOR SETTINGS
Set heat anticipator settings at 0.14 amp for the first stage and 0.14 amp for second-stage heating, when available.
ELECTRIC HEATERS
The 50GCQ units may be equipped with field-installed accessory electric heaters. The heaters are modular in design, with heater frames holding open coil resistance wires strung through ceramic insulators, line-break limit switches and a control contactor.
Heater modules are installed in the compartment below the indoor (supply) fan outlet. Access is through the indoor access panel. See Fig. 35-37.
Not all available heater modules may be used in every unit. Use only those heater modules that are UL listed for use in a specific size unit. Refer to the label on the unit cabinet for the list of approved heaters.
Refer to the Small Roof Top Units Accessory Electric Heater and Single Point Box installation instructions for further details.

Control Box Access Panel

Indoor Blower Access Panel

Fig. 35 — Typical Access Panel Location

Fig. 34 — DIP Switch Settings – Defrost Board

1

2

1

·

1

0

·

0

30 minutes (factory default)

Table 5 — DIP Switch Positions

1

2

1

2

·

1

1

·

0

·

·

0

60 minutes

90 minutes

1

2

·

·

120 minutes

3

1

·

On

0

Off

Fan Delay

22

Optional Factory-Installed Disconnect

Main Single

Control Point

Box

Box

Center Post

Vane Axial Indoor Fan System

Manual Reset Limit Switch

Control Wire Terminal Block

Heater Cover

Heater Mounting Bracket

Fig. 36 — Typical Component Location

SINGLE POINT BOXES WITHOUT FUSES
Unit heater applications not requiring supplemental fuses require a special single point box without any fuses. The accessory single point boxes contain a set of power taps and pigtails to complete the wiring between the single point box and the unit’s main control box terminals. Refer to accessory heater and single point box installation instructions for details on tap connections.
LOW-VOLTAGE CONTROL CONNECTIONS
Pull the low-voltage control leads from the heater module — WHT, VIO and BRN to the 4-pole terminal board TB4 located on the heater bulkhead to the left of the Heater module. Connect the WHT lead from Heater circuit #1 to terminal TB4-1. For 2 stage heating, connect the VIO lead from Heater circuit #2 to terminal TB4-2. Connect the BRN lead(s) to terminal TB4-3. See Fig. 39.

UCB 2
3

PNK ORN

TRAN 1 C

Heater Module
Fig. 37 — Typical Heater Module Installation
SINGLE POINT BOXES AND SUPPLEMENTARY FUSES
When the unit MOCP device value exceeds 60-A, unit-mounted supplementary fuses are required for each heater circuit. These fuses are included in accessory single point boxes, with power distribution and fuse blocks. The single point box will be installed directly under the unit control box, just to the left of the partition separating the indoor section (with electric heaters) from the outdoor section. The single point box has a hinged access cover. See Fig. 38. The single point box also includes a set of power taps and pigtails to complete the wiring between the single point box and the unit’s main control box terminals. Refer to the Small Roof Top Units Accessory Electric Heater and single point box installation instructions for details on tap connections.
All fuses on 50GCQ units are 60-A. (Note that all heaters are qualified for use with a 60-A fuse, regardless of actual heater ampacity, so only 60-A fuses are necessary.)
Control Wiring

ORN

TB4

1

PNK 2

BRN 3

Field Connections

WHT

VIO BRN BRN

Elec Htr VIO HR2

BRN

WHT HR1 BRN

HR1: Heater Circuit 1 HR2: Heater Circuit 2
(if two-circuit module installed)
Fig. 39 — Accessory Electric Heater Control Connections
CONTROL AND POWER WIRING DIAGRAMS
Figures 40-46 are typical control and power wiring diagrams.

Foam

Power Wiring

Heater Relay

Heater Mounting Screws

Fig. 38 — Typical Single Point Installation

23

24

Fig. 40 — Typical Control Wiring Diagram, Electro-Mechanical Controller with POL224 (50GCQ*07-08 230/460/575-3-60 Shown)

25

Fig. 41 — Typical Control Wiring Diagram, Electro-Mechanical Controller with POL224 (50GCQ*09 230/460/575-3-60 Shown)

26

Fig. 42 — Typical Control Wiring Diagram, SystemVuTM Controller (50GCQ*07-08 230/460/575-3-60 Shown)

27

Fig. 43 — Typical Control Wiring Diagram, SystemVuTM Controller (50GCQ*09 230/460/575-3-60 Shown)

Fig. 44 — Typical 50GCQ 07-08 Power Wiring Diagram, 230/460V-3-60 Shown (Electro-Mechanical Control Units)
28

Fig. 45 — Typical 50GCQ 07-08 Power Wiring Diagram, 230/460V-3-60 Shown (SystemVuTM Control Units)
29

Fig. 46 — Typical 50GCQ 09 Power Wiring Diagram, 460/575V-3-60 Shown (Electro- Mechanical and SystemVuTM Controller Units)
30

EconomizerONE (Factory Option)
ECONOMIZER SETTINGS
Interface Overview
EconomizerONE
This option consists of the following:
· Low Leak Economizer Assembly
· HH79NZ039 OA (Outdoor Air) Dry Bulb Sensor
· HH79NZ039 Mixed Air Sensor
· POL224 Controller
· 50HE005489 Harness
POL224 Economizer Module Wiring
The economizer controller used on electromechanical units is a Siemens POL224, which is to be located in the RTU base unit’s control box. See Fig. 47 for button description of the POL224 controller. Refer to the unit dimensional drawing for the location of the control box access panel.
The POL224 controller provides the following:
1. One-line LCD (Liquid Crystal Display) — After a period of inactivity, the controller displays the default HMI (Human Machine Interface) screen (free cooling status, 1FREE-COOL YES or 1FREE COOL NO). See Fig. 47-51.
2. Operation button (Up button) — Move to the previous value, step, or category.
3. Operation button (Down Button) — Move to the next value, step, or category.
4. Operation Button (Enter Button):
a. Press Enter to edit the current value or option.
b. Press Enter to confirm a newly selected value or option.
c. Press Enter + Up to jump up one entire category.
d. Press Enter + Down to jump down one entire category.
User Interface and Keypad
The controller user interface consists of an LCD display and a 3-button keypad for input. The LCD is a 16 character by 1-line dot matrix display. The keypad is used to navigate and change the desired menu items on the display. See Fig. 47.
The ClimatixTM1 mobile application allows for installation, commissioning, and servicing. Scanning a QR code on the controller allows users to download the mobile application on AndroidTM1 or Apple iOS®1, but a Wi-Fi/WLAN stick is needed. See Fig. 47 and 48. Plug Wi-Fi/WLAN stick into controller USB port for temporary connection for mobile application setup. The Wi-Fi/WLAN stick can be used for multiple units.
Menu Structure
Menus are displayed in the economizer controller via categories. There are eight first-level menus, each of which is represented by a number at the beginning of the line on the LCD. Pressing Enter + Up or Down can toggle between different first-level menus. Submenus follow the numbered first-level menus closely. Pressing Up or Down can toggle between different submenus.
At the end of the line, the LCD displays the value of the current submenu (if any). If the value is editable, pressing Enter will put the terminal in Edit mode. The value is then highlighted for change. After making a change by pressing Up or Down, press Enter to confirm the change and exit the Edit mode. See Fig. 50.
Powering the Economizer Controller
The POL224 controller power connections are made through the economizer harness (P/N 50HE005489). Connections from

the harness are made to the C (24 vac common) and R (24 vac power) terminals of the economizer controller. See Fig. 49.
LED Indication
NOTE: If different faulty events occur at the same time, then sensor/DAC LED lights up following the priority below: Red Yellow Off. For example, if there is a humidity sensor error and air temperature failure at the same time, then the sensor LED turns red rather than yellow. See Fig. 51 and Table 6.
IMPORTANT: After the Economizer controller enters the running state, it may take one minute for peripheral devices to complete initialization. Before that, LED indication might be unstable.

1

2

3

4 5 6

NOTE: QR codes in this image are for reference only.

NO.

DESCRIPTION

1 USB port for Wi-Fi/WLAN stick.

2 QR code to download ClimatixTM mobile application.

One-line LCD. After a period of inactivity, the controller

3

displays the default: HMI screen (free cooling status, 1FREECOOL YES or

1FREECOOL NO)

4

Operation button (Up button) – Move to the previous value, step or category.

5

Operation button (Down button) – Move to the next value, step or category.

Operation button (Enter button):

· Press to edit the current value or option.

6

· Press to confirm a newly selected value or option. · Press Enter + Up to jump up one entire category.

· Press Enter + Down to jump down one entire

category.

Fig. 47 — POL224 Controller

1. Third-party trademarks and logos are the property of their respective owners.

NOTE: QR codes in this image are for reference only.
Fig. 48 — Wi-Fi/WLAN Stick

31

Power

Fig. 49 — Powering the EconomizerONE Controller

1

2

3

No. Description
1 Number representing the first-level menu of Status Display. Different numbers represent different menus: 1: Status Display 2: Basic Settings 3: Advanced Settings 4: Alarms 5: Enter Configuration State and Reset 6: I/O Config 7: Testing 8: Enter Running State
2 Submenu
3 Value of the current submenu
*See “Setup and Configuration” on page 41 for detailed submenus together with possible values or ranges.
Fig. 50 — Menu Structure Descriptions

Table 6 — LED Indication

STATUS

FREE COOLING
LED

Commissioning mode

Yellow Blinking

Power start up

Yellow On

Free cooling is running

Green On

Free cooling is available but not running

Green Blinking

Not economizing when it should

Red Blinking

Economizing when it should not

Red On

Sensor working okay

—

Humidity sensor error

—

CO2 sensor error

—

Air temperature fault/failure

—

Excess outdoor air

—

Damper working okay

—

Damper not modulating

—

Damper slippage

—

Damper unplugged

—

Terminal ACT-FB is

configured but no available

—

feedback signal

SENSOR LED
Yellow Blinking Yellow On
—
—
—
—
Green On Yellow On
LED Off Red On
Red Blinking
— —
—
—
—

DAC LED
Yellow Blinking Yellow On
—
—
—
—
— — — —
—
Green On Red On
Red Blinking Fast Red Blinking
LED Off

Functions
Free Cooling Economizing
Free cooling uses unconditioned outside air to cool the space directly. The economizer controller enables or disables free cooling after it judges which control mode is active. It also uses hysteresis to ensure a smooth switchover.
Depending on the sensors that are used, there are four different control modes. In different control modes, the assessed conditions are different. See Table 7.
Default Hysteresis Setting
Hysteresis setting (DB) defaults to 2°F (­17°C). See Fig. 52.

DB On

123

NO.

DESCRIPTION

1

Free Cooling LED

2

Sensor LED

3

DAC LED

Fig. 51 — LED Indication

Off

ShutOff SP LEGEND OAT — Outside Air Temperature DB — Deadband SP — Set Point

OAT

Fig. 52 — Hysteresis Settings

32

Table 7 — Free Cooling Functions

CONTROL MODE
Control Mode 1 · Fixed Dry bulb

SENSORS USED
OA (outside air) temperature sensor and MA (Mixed Air) temperature sensor

Control Mode 2

OA temperature sensor, RA (Return Air)

· Differential Dry bulb temperature sensor and MA temperature

(Dual Dry bulbs) sensor

Control Mode 3 · Combination Fixed OA temperature and humidity sensor, and MA
Enthalpy and Fixed temperature sensor Dry bulb Control

Control Mode 4

· Combination of

OA temperature and humidity sensor, RA

Differential

temperature and humidity sensor,

Enthalpy and Fixed and MA temperature sensor

Dry bulb

ENABLE FREE COOLING?
The outside air dry bulb temperature is compared with the set temperature shutoff setpoint. If the outside air dry bulb temperature is below the temperature shutoff setpoint, then the outside air is used to meet all or part of the cooling demand.
The outside-air dry bulb temperature is compared with the return air dry bulb temperature. If both OAT and RAT are higher than the temperature high limitation, then free cooling is prohibited. If OAT or RAT is lower than the temperature high limitation and the outside air dry bulb temperature is lower than the return air dry-bulb temperature, then the outside air is used to meet all or part of the cooling demand.
The outside air dry bulb temperature and enthalpy are compared with the set temperature and enthalpy shutoff setpoints. If the outside air enthalpy is lower than the set enthalpy shutoff setpoint, and the outside air dry bulb temperature is lower than the temperature shutoff setpoint, then the outside air can be used for economizing.
The outside air dry bulb temperature and enthalpy are compared with the temperature shutoff setpoint and return air enthalpy. If both OA enthalpy and RA enthalpy are higher than the enthalpy high limitation, then free cooling is prohibited. If OA enthalpy or RA enthalpy is lower than the enthalpy high limitation, outside air enthalpy is lower than the return-air enthalpy, and the outside air dry bulb temperature is lower than the set temperature shutoff setpoint, then outside air can be used for economizing.

Damper Modulation During Free Cooling
Once outside air is suitable for free cooling, the controller modulates the damper based on MAT (mixed air temperature, default) or OAT (outside air temperature). Refer to Table 7.
If MAT is used when free cooling is enabled, MAT setpoint (3MAT SET, configurable in “Parameter Settings — Advanced” on page 44) is used for MAT modulating. When MAT falls below the anti-freeze setpoint (3FRZ PROT), the damper either fully closes or opens to the minimum position (configurable in “Parameter Settings — Advanced” on page 44).
1. If MAT is lower than MAT setpoint, then the damper is modulated to maintain MAT setpoint, towards fully closed or open to the minimum position based on occupancy status if MAT continues dropping.
2. If MAT is in the range [MAT setpoint, (MAT setpoint + neutral zone band [1°F by default])], then the damper position does not change.
3. If MAT is higher than (MAT setpoint + neutral zone band), then the damper opens towards fully open.
4. If MAT is 10°F higher than MAT setpoint, then the damper fully opens to 100%.
If OAT is used when there is a cooling demand, the damper can be opened to different positions depending on different outside air temperatures:
1. If outside air is higher than 50°F but lower than the temperature shutoff setpoint, then the damper is fully open.
2. If outside air is higher than OAT lockout setpoint but lower than 50°F, then linear modulation is applied when only

Cooling Stage 1 input (Y1I) is ON. Result of the following formula indicates the damper’s open position:
([OAT – OAT Lockout Setpoint] / [50 – OAT Lockout Setpoint]) * (80% – MIN POS)

• MIN POS
  NOTE: When both free cooling and mechanical cooling are on, damper remains fully open regardless of the modulating logic.
  Location-Based Shutoff Setpoints
  The economizer controller can get location-based temperature and enthalpy shutoff setpoints automatically if it is connected to the ClimatixTM mobile application. Once a Wi-Fi/WLAN stick is plugged in, the economizer controller can establish network connection with the mobile application. The temperature and enthalpy shutoff setpoints obtained via the phone or tablet’s GPS functionality can then be synchronized to the economizer controller.
  Cooling Stage Operation
  The economizer controller accepts inputs for 1 and 2-stage cooling inputs and reroutes to the RTU through the relay connection Y1 and Y2.
  The operation of the cooling stages is determined by the availability of Free Cooling provided by the economizer operation mode. See Cooling Stage I/O Logic Tables 8-9. Based on the use of Free Cooling, the operating modes are as follows:
  · Y1 is Stage 1 Cooling Demand.
  · Y2 is Stage 2 Cooling Demand.
  · Free Cooling is always the first cooling stage.
  · Cooling Stage 1 call from the Commercial Thermostat (Y1) energizes the Y1 input to the economizer controller.
  · Cooling Stage 2 call from the Commercial Thermostat (Y2) energizes the Y2 input to the economizer controller.

33

Table 8 — 1 and 2-Stage Cooling Stage I/O Logic

ECONOMIZER CONDITION MET

Y1

NO

On

NO

On

NO

Off

YES

On

YES

On

YES

Off

Y2

COOLING COOLING STAGE 1 STAGE 2

On

On

On

Off

On

Off

Off

Off

Off

On

On

On/Offa

Off

Off

Off

Off

Off

Off

NOTE(S):
a. If OAT MAT setpoint (3MAT SET), then Relay 2 is always OFF to disable Cooling Stage 2. Otherwise, if both stages of cooling (Y1 and Y2) are ON for more than a set time (15 minutes by default), Y2 remains ON, and the OAT is higher than MAT setpoint, then Relay 2 energizes to allow Y2 pass-through to enable Cooling Stage 2.

Table 9 — 2-Stage Cooling Stage I/O Logic

ECONOMIZER CONDITION MET

Y1

NO

On

NO

On

NO

On

NO

Off

YES

On

YES

On

YES

On

YES

Off

Y2

COOLING COOLING STAGE 1 STAGE 2

On

On

On

On

On

On

Off

On

Off

Off

Off

Off

On

On

On

On

On

On/Off

Off

Off

Off

Off

Off

Off

IMPORTANT: The economizer controller can tolerate thermostat wiring mismatch, e.g. Thermostat Y1 Economizer Y2-In, Thermostat Y2 Economizer Y1-In. The handling logic is Stage =Y1I + Y2I. For example, Y1O =1 if Stage > =1, Y2O =1
if Stage > = 2.

Multi-Speed Fan Support
The economizer controller supports connection to 2-speed fans. When the unit is equipped with a multi-speed fan, the damper responds to multiple fan speeds via multiple minimum positions (MIN POS) to keep minimum airflow. See Tables 10-12.

Table 10 — Damper MIN POS for 2-Speed Fana

Y1

Y2

W1 OR O/B

SPD L

SPD H

POS L

POS H

X

—

—

X

—

X

—

X

X

—

—

X

—

X

—

—

X

—

X

—

X

NOTE(S):
a. A multi-speed fan is not controlled by the economizer controller but by an external logic board.

LEGEND
POS L — Damper MIN POS for Low-Speed Fan POS H — Damper MIN POS for High-Speed Fan SPD L — Low-Speed (Fan) SPD H — High-Speed (Fan)

Table 11 — Different Fan Speeds with Different Configured Outputsa

FAN TYPE 1-SPEED
FANc
2-SPEED FANc

1-SPEED COOLINGb
· Spd H (regardless of cooling demand, OCC=Yes)
· Spd L (0 or 1 cooling demand)
· Spd H (2 cooling demands)

2-STAGE COOLINGb
· Spd H (regardless of cooling demand, OCC=Yes)
· Spd L (0 or 1 cooling demand)
· Spd H (2 cooling demands)

NOTE(S):
a. If a single-speed fan connects to the Controller, it opens directly on the call of cooling/heating. The damper position is Pos H.
b. Configured by Y1O or Y2O. c. Configured by 6FAN.

LEGEND
Spd L — Low Speed (Fan) Spd H — High Speed (Fan)

Table 12 — Different Damper Minimum Positions with Different Configured Outputs

FAN TYPE
1-SPEED FANb
2-SPEED FANb

1-SPEED COOLINGa
· Pos H (regardless of cooling demand, OCC=Yes)
· Pos H (regardless of cooling demand, OCC=Yes)

2-STAGE COOLINGb
· Pos H (regardless of cooling demand, OCC=Yes)
· Pos L (0 or 1 cooling demand)
· Pos H (2 cooling demands)

NOTE(S):
a. Configured by Y1O or Y2O. b. Configured by 6FAN.

LEGEND
Pos L — Damper MIN POS for Low-Speed Fan Pos H — Damper MIN POS for High-Speed Fan

If DCV (demand controlled ventilation) is enabled, each fan speed corresponds to two damper position ventilation setpoints (VENT MIN, VENT MAX), e.g., Pos L corresponds to 2VENTMIN L… 2VENTMAX L. See Table 13 for Different Damper Position Setting with Different Configured Outputs with DCV enabled.
If CO2 sensor is connected but DCV is disabled, then each fan speed corresponds to one minimum damper position ventilation setpoint. See Table 14 for Different Damper Position Setting with Different Configured Outputs with DCV disabled.

34

Table 13 — Different Damper Position Settings with Different Configured Outputs (DCV is Enabled)

FAN TYPE 1-SPEED FANb
2-SPEED FANb
NOTE(S): a. Configured by Y1O or Y2O. b. Configured by 6FAN.

1-STAGE COOLINGa · 2VENTMIN H to 2VENTMAX H (regardless of
cooling demand, OCC=Yes)
· 2VENTMIN H to 2VENTMAX H (regardless of cooling demand, OCC=Yes)

2-STAGE COOLINGa
· 2VENTMIN H to 2VENTMAX H (regardless of cooling demand, OCC=Yes)
· 2VENTMIN L to 2VENTMAXL (0 or 1 cooling demand)
· 2VENTMIN H to 2VENTMAX H (2 cooling demands)

Table 14 — Different Damper Position Settings with Different Configured Outputs (DCV is Disabled, CO2 sensor is connected)

FAN TYPE 1-SPEED FANb
2-SPEED FANb

1-STAGE COOLINGa · 2VENTMIN H (regardless of cooling demand,
OCC=Yes)
· 2VENTMIN H (regardless of cooling demand, OCC=Yes)

2-STAGE COOLINGa
· 2VENTMIN H (regardless of cooling demand, OCC=Yes)
· 2VENTMIN L (0 or 1 cooling demand)
· 2VENTMIN H (2 cooling demands)

NOTE(S):
a. Configured by Y1O or Y2O. b. Configured by 6FAN.
Cooling Delay via Increasing Fan Speed
If there is cooling demand while outside air is suitable for economizing, then the economizer controller tries to increase fan speed to maximize the use of outside air first. If the cooling demand is not reached within a set time, then mechanical cooling will be enabled.
Typical field application:
1. Prerequisites:
· Outside air is suitable for economizing and free cooling is ON.
· Fan connected to the controller supports multiple speeds. Cooling delay function does not work if only a one-speed fan is connected to the controller.
2. If it is a 2-speed fan and there are two cooling demand inputs/ outputs and Y1-Input is called, then the controller sets fan speed to Speed Low. Damper is fully open (100%).
If Y2-Input is also called, then the controller increases fan speed to Speed High and starts fan delay (2FAN DLY) time. After the delay time runs out, the controller starts Y1-Output.
Demand Controlled Ventilation (DCV)
If a field-installed CO2 sensor is connected to the EconomizerONE controller, then a demand controlled ventilation strategy will operate automatically. As the CO2 level in the space increases above the setpoint (on the EconomizerONE controller), the minimum position of the dampers will be increased proportionally until the Maximum Ventilation setting is reached. As the space CO2 level decreases because of the increase in fresh air, the outdoor damper will follow the higher demand condition from the DCV mode or from the free cooling mode.
The controller modulates the outside air damper based on the CO2 level through the ppm value selected between the range of 500 and 2000 ppm. The measured CO2 concentration value is compared with the set DCV setpoint. If the measured CO2 concentration value is below the DCV setpoint, then keep the damper to the minimum position. Otherwise, enable DCV. Once DCV is enabled, the DCV PID starts to run to control the indoor CO2 concentration value towards the DCV setpoint. The damper opens to the maximum position.

NOTE: DCV is disabled if the controller receives no occupancy signal.
DCV operation is available in Occupied and Unoccupied periods with the EconomizerONE system. However, a control modification will be required on the unit system to implement the Unoccupied period function. Refer to controller accessory installation instruction manual for further controls and command operation information.
High Humidity Limitation
The economizer controller applies high limit of humidity to enthalpy-based economizing. When the OA dew point is below the dew point setpoint, enthalpy- based economizing is available. Otherwise, enthalpy-based economizing is unavailable.
Anti-Freeze Protection
The economizer controller initiates the anti-freeze protection if MAT or OAT temperature falls below the anti-freeze setpoint.
MAT-Based Anti-Freeze Protection
1. If MAT temperature falls below the anti-freeze setpoint (3FRZ PROT), then:
· The controller closes both damper and compressor if unit type is conventional unit and cooling/heating conventional operation mode is enabled.
· The controller closes the damper if unit type is heat pump and heat pump operation mode is enabled.
2. If the MAT sensor fails, MAT is substituted by OAT to continue the anti- freeze assessment. If OAT fails too, the controller closes the damper immediately.
OAT-Based Anti-Freeze Protection
If OAT temperature falls below the OAT lockout setpoint (3OAT LOCK):
1. The controller stops the compressor from running if unit type is conventional unit and cooling/heating conventional operation mode is enabled.
2. The controller compressor is bypassed if unit type is heat pump and heat pump operation mode is enabled.

35

Exhaust Fan Operation
Up to two exhaust fans can be connected to the economizer controller.
· If Exhaust Fan 1 is connected and configured, then Exhaust Fan 1 parameter group (L, M and H) is available, depending on fan configuration.
· If Exhaust Fan 2 is connected and configured, then Exhaust Fan 2 parameter group (L, M and H) is available, depending on fan configuration.
· The controller energizes Exhaust Fan Relay 1 and Exhaust Fan Relay 2 if the damper position reaches Exhaust Fan 1 parameter setting and Exhaust Fan Relay 2 parameter setting respectively. The selection of L, M, or H matches the current fan speed.
NOTE: If terminal ACT-FB is configured, then the damper position is the damper feedback position. If feedback signal is unavailable, it is the simulated position.
Occupancy Input
The economizer controller can receive an occupancy signal from the connected thermostat or work under Occupied mode all the time. This is configurable in the Thermostat setup from the ClimatixTM mobile application or under the I/O Configuration menu on the inbuilt display. See “Parameter Settings — I/ O Configurations” on page 44 for more information.
IMPORTANT: On the call of cooling, when the controller is configured to receive signal from the thermostat but the thermostat is working under the Unoccupied mode, the damper is fully closed if outside air is not suitable for economizing. If outside air is suitable for economizing, the damper is fully open.
Pre-occupancy Purge
The pre-occupancy purge demand comes from the configuration of the Auxiliary features in the ClimatixTM mobile application or 6AUX2-I under the I/O Configuration menu on the inbuilt display.
During pre-occupancy purge on the call of heating or when there is no cooling/heating demand, the damper position is MIN POS.
During pre-occupancy purge on the call of cooling, the damper position is MIN POS if outside air is not suitable for economizing. If outside air is suitable for economizing, then the damper is fully open.
Airflow Commissioning
Airflow measurement station (differential pressure signal) can connect to the controller temporarily to run airflow commissioning to calculate, calibrate, and store 4 fan speed characteristic curves automatically at damper positions 40%, 60%, 80%, and 100%. The controller places the damper to a proper position to meet minimum or any other airflow requests in cfm.

Users can enable this function only from the ClimatixTM mobile application if the related function is available in the current mobile application version. Fault Detection and Diagnostics The economizer controller can detect and diagnose free cooling faults, sensor operation faults, and damper modulating faults. It can also report anti-freeze and shutdown notifications and actuator errors. Following is a list of all detectable or reportable information: · Sensor disconnected or has no signal. · Sensor short or high signal (under range or over range). · Not economizing. · Unexpected economizing. · Excess outdoor air. · Damper not modulating. · Input power monitor and brownout. After detecting
brownout, the economizer controller enters the brownout protection mode and disables all of the relay outputs. · Anti-freeze notifications. · Shutdown notifications. · Actuator errors. · Too low or too high leaving air temperature. · Cooling/heating error. · Damper actuator cycle count. Parameter 1ACT CNT indicates number of times actuator has cycled. It is resettable via HMI item 8ACT CNT RESET.
IMPORTANT: The first 6 faults are detectable via LEDs or alarm reports on the LCD. See LED Indication on page 32 and Alarms on page 45 for fault indications. These faults can also be displayed in the Operating section of the ClimatixTM mobile application.
Firmware Update NOTE: Back up configurations before firmware update. All the previous configuration data are erased after firmware update. NOTE: Contact Application Engineering for more information on support for firmware.
IMPORTANT: If the controller enters the configuration state for the convenience of I/O configurations, then users can manually switch to the running state after finishing configurations. To do so, press Enter + Up at the same time, and then press Enter to confirm the switch after 8RUN STATE appears on the LCD.

36

WIRING
WARNING
Failure to follow this caution may result in damage to equipment. Be sure to allow enough time for compressor startup and shutdown between checkout tests so that the compressors do not short-cycle. Mounting Devices Connected to the Economizer Controller Devices like damper actuators, sensors (temperature sensor, humidity sensor, combination temperature and humidity sensor, CO2 sensor), thermostats, and exhaust fans can be connected to the economizer controller. For information on how to mount the devices, see the device’s installation instructions. See Fig. 53 and Table 15 for economizer controller wiring details.
Fig. 53 — EconomizerONE Control Wiring
37

Table 15 — EconomizerONE Control Wiring Settings

NO.

LABEL

TYPE

1

RS485 Modbus A

2

–

RS485 Modbus B

3

¬

GND_ISO

4

MAT Type II NTC 10K or 0-10 vdc

5

COM COM

6

OAT Type II NTC 10K or 0-10 vdc

7

OAH 0-10 vdc or 4-20mA

8

COM COM

9

AUX-AI 0-10 vdc, 2-10 vdc or 0-5 vdc

10

RAT

Type II NTC 10K or 0-10 vdc

11

RAH 0-10 vdc or 4-20mA

12

S-COM COM

13

S-24V 24 vac

14

ACT-FB 2-10 vdc

15

ACT2-10 2-10 vdc

16

ACT-COM COM

17

ACT-24V 24 vac

18

AUX2-O 24 vac OUT

19

COM COM

20

AUX2-I 24 vac IN

21

AUX1-O 24 vac OUT

22

COM COM

23

AUX1-I 24 vac IN

24

OCC 24 vac IN

25

Y2O

24 vac OUT

26

Y2I

24 vac IN

27

Y1O

24 vac OUT

28

Y1I

24 vac IN

29

C

COM

30

R

24 vac

DESCRIPTION
Line A
Line B
Earth Ground
Mixed or Discharge Air Temperature Sensor
Mixed or Discharge Air Temperature Sensor Common
Outside Air Temperature Sensor
Outside Air Relative Humidity Sensor
Outside Air Temperature Sensor or Outside Air Relative Humidity Sensor Common
Air Quality Sensor or Pressure Sensor
Return Air Temperature Sensor
Return Air Relative Humidity Sensor
24 vac Common
24 vac Power Out to Sensors
Damper Actuator Feedback
Damper Actuator Output
Damper Actuator Output Common
24 vac Power Out to Damper Actuator
Configurable: · Exhaust Fan (1 or 2) · System Alarm output (Title 24)
24 vac Common
Configurable: · Shut Down · Heat Conventional (W1) · Heat Pump Changeover (reversing valve OB) · Pre-occupancy
Configurable: · Exhaust Fan (1 or 2) · System Alarm output (Title 24)
24 vac Common
Configurable: · Shut Down · Heat Conventional (W1) · Heat Pump Changeover (reversing valve OB) · Pre-occupancy
Occupancy Input
Cooling Stage 2 Output to Stage 2 Mechanical Cooling
Cooling Stage 2 Input from Commercial Thermostat
Cooling Stage 1 Output to Stage 1 Mechanical Cooling
Cooling Stage 1 Input from Commercial Thermostat
24 vac Common
24 vac Power

38

Connecting Peripheral Devices to the Economizer Controller See Fig. 54-58 for wiring details.

· Outside Air:

Connect to the

Mixed or Discharge Air Temperature Sensor

OAT and COM

terminals of the device.

Outside Air Temperature Sensor

· Return Air

(Differential): Connect to the RAT

Return Air Temperature Sensor

and S-COM

terminals of the

device.

· Mixed Air: Connect
to the MAT and

COM terminals of

the device.

Fig. 54 — Temperature Sensor Connection

· Outside Air
Relative Humidity:
Connect to the

OAH and COM terminals of the

Outside Air Relative Humidity Sensor

device.

· Return Air Relative
Humidity: Connect to the RAH and

Return Air Relative Humidity Sensor

S-COM terminals of the device.

Fig. 55 — Relative Humidity Sensor Connection

39

· Outside

Combination

Temperature/

Humidity: Connect Combo Temperature and Humidity Sensor

to the OAT, COM,

and OAH terminals

of the device.
· Return

Combo Temperature and Humidity Sensor

Combination

Temperature/

Humidity: Connect

to the RAT, S-COM,

and RAH terminals

of the device.

Fig. 56 — Combination Temperature/Humidity Sensor Connection

· Connect to the
AUX-AI, S-COM, and S-24V terminals of the device.

Air Quality Sensor or Pressure Sensor

Fig. 57 — CO2/Pressure Sensor Connection

· Connect to the
ACT 2-10, ACT-COM, and ACT-24V terminals of the device.

Damper Actuator: Power and 2-10 Vdc

Fig. 58 — Damper Actuator Connection

40

SETUP AND CONFIGURATION
IMPORTANT: Before setup and configuration, it is recommended to obtain some location-based values, such as shutoff points, or utilize the location services in the ClimatixTM mobile application.
Set up and configure the economizer controller before putting it into usage. This can be accomplished by using the ClimatixTM mobile application or the inbuilt display. After sensor, compressor, thermostat, or actuator is connected to the economizer controller, values/statuses are displayed in the Operating section of the mobile application and on the LCD. Users can manually change basic and advanced settings, configure I/Os, and test the damper operation and any configured outputs by modifying the corresponding parameter values in the local device or mobile application. See Tables 16-23 for complete list of all parameters available on the LCD display. Refer to it during the setup and configuration process.
NOTE: For all units, the Climatix application login is: Administrator. For units coming from the factory with CO2 configuration or single enthalpy (control mode 3), the controller password is OneBT2.1. For all other units, use the controller password OneBT.

NOTE: Parameters and display menus may display differently/ dynamically if different applications are configured. See Tables 16-23.
IMPORTANT: Not all operations are available on the local POL224. For example, users can only obtain shutoff setpoints and perform cfm commissioning via the ClimatixTM mobile application. Setup and configuration on the local device are only recommended if operations from the mobile application are unavailable. Check the mobile application for all operations that can be performed from the mobile application end.
IMPORTANT: By connecting the RS485 port to a PC, all parameters are also readable or writable from PC tools such as Modbus Poll.exe via Modbus®a and Yabe.exe via BACnetTMa MSTP (Bps 38400 [default], Bps 9600, Bps 19200, Bps 115200). Note that an external End of Line (EOL) element is required to achieve Baud Rate 115200 at a maximum cable length of 4000 ft (1.2 km).
NOTE(S): a. Third-party trademarks and logos are the property of their respective owners.

41

PARAMETER 1FREECOOL 1ECON ENAB 1OCCUPIED 1Y1-IN 1Y1-OUT 1Y2-IN 1Y2-OUT 1AUX1-I 1AUX1-O 1AUX2-I 1AUX2-O
1COMP STAGE 1HEAT ENAB 1MIX AIR LOW
1MAT PRES 1LAT PRES 1OAT PRES 1OAH PRES 1RAT PRES 1RAH PRES 1CO2 PRES
1DCV STATUS
1FAN SPD LV 1ACT OUT 1ACT FB 1ACT POS 1ACT CNT
1EQUIP
1OAT LOCK 1INS

Table 16 — Status Display

DESCRIPTION Indicates whether the system can use outdoor air for free cooling. Indicates whether outdoor air is being used for the first stage of cooling. Indicates whether the space is occupied. If users choose ALWAYS for 6OCC when configuring I/Os, then the parameter value is YES; if users keep the default selection T-STAT for 6OCC and the controller receives 24-v signal from OCC input, then the value is YES. Otherwise, the value is NO. Y1-In call from thermostat for Cooling Stage 1. Y1-Out signal to compressor for Cooling Stage

1. Y2-In call from thermostat for Cooling Stage 2. Y2-Out signal to compressor for Cooling Stage 2. Dynamic item: Appears only if Y2-Out terminal is configured. Aux1-In signal Dynamic item: Appears only if Aux1-In terminal is configured. Aux1-Out signal Dynamic item: Appears only if Aux1-Out terminal is configured. Aux2-In signal Dynamic item: Appears only if Aux2-In terminal is configured. Aux2-Out signal Dynamic item: Appears only if Aux2-Out terminal is configured.
   Indicates compressor current stage.
   Indicates whether heating is enabled. Indicates whether the anti-freeze protection function is enabled for a mixed air temperature sensor. If the detected air temperature is lower than the anti-freeze protection setpoint (3FRZ PROT), then the parameter value is YES. Otherwise, it is NO. Indicates the present value of the mixed air temperature (MAT) sensor. Dynamic item: Appears only if MAT or AUTO is selected for 3DIF T LOC under Parameter Settings — Advanced on page 44. Indicates the present value of the leaving air temperature (LAT) sensor. Dynamic item: Appears only if LAT or AUTO is selected for 3DIF T LOC. Indicates the present value of the outdoor air temperature (OAT) sensor. Dynamic item: Appears only if an OAT sensor is configured. Indicates the present value of the outdoor air relative humidity (OAH) sensor. Dynamic item: Appears only if an OAH sensor is configured. Indicates the present value of the return air temperature (RAT) sensor. Dynamic item: Appears only if a RAT sensor is configured. Indicates the present value of the return air relative humidity (RAH) sensor. Dynamic item: Appears only if a RAH sensor is configured. Indicates the present value of the CO2 sensor. Dynamic item: Appears only if a CO2 sensor is configured. Indicates the demand controlled ventilation (DCV) status. Dynamic item: Appears only if a CO2 sensor is configured. Displays ON if the measured CO2 concentration value is above the DCV setpoint and OFF if below the DCV setpoint. Indicates the current fan speed status (low, medium, or high). If a one-speed fan is connected and configured, then this item is invisible. Dynamic item: Appears only if “6FAN” is configured as “2SPEED” under Parameter Settings — I/O Configurations on page 44. Indicates current position of damper actuator in V. Indicates feedback signal of damper actuator in V. Indicates current position of damper actuator in % Open. Indicates number of times actuator has cycled (1 cycle = 180 degrees of movement in any direction). Resettable via HMI item 8ACT CNT RESET under Enter Running State on page 46.
   Indicates the equipment type. If HP(O) or HP(B) is chosen for 6AUX1-I, then the parameter value is HP(O) or HP(B) respectively. If neither is chosen, then the value is CON RTU.
   Indicates status of the OAT cooling lockout function.
   Indicates the installation date of the economizer controller. If the installation date is incorrect, press Enter to change and confirm month, date, and year.

VALUE
YES NO
ON OFF
Off 1 2 3 YES NO
The corresponding detected value is displayed on the LCD.
ON OFF
L H
The corresponding detected value is displayed on the LCD.
HP(O) HP(B) CON RTU
NO LCKOUT
OVRD —

42

PARAMETER 2 TEMP OFF
2ENTH OFF
2DVC
2FAN L ACT 2FAN H ACT 2VENTMAX L 2VENTMAX H 2VENTMIN L 2VENTMIN H CFM COMM 2DEGREES 2FAN 2EX1 L
2EX1 H
2EX2 L
2EX2 H 2THL 2EHL 2FAN DLY

Table 17 — Parameter Settings — Basic

DESCRIPTION

RANGE

Temperature shutoff setpoint can be obtained automatically if a smartphone or tablet with the mobile application installed on it is connected to the network provided by a Wi-Fi/WLAN stick plugged into the economizer controller. This can also be a manually defined setpoint.

48…80°F; increment by 1

Enthalpy shutoff setpoint can be obtained automatically if a smartphone or tablet with the mobile application installed on it is connected to the network provided by a Wi-Fi/WLAN stick plugged into the economizer controller. This 22…30 Btu/lbm; increment by 1 can also be a manually defined setpoint. Dynamic item: Appears only if an OAH sensor is configured.

Demand controlled ventilation setpoint can be obtained automatically if a smartphone or tablet with the mobile application installed on it is connected to the network provided by a Wi-Fi/WLAN stick plugged into the economizer controller. This can also be a manually defined setpoint. Dynamic item: Appears only if a CO2 sensor is configured.

300…2000PPM; increment by 100

Damper minimum position when fan runs at a low speed. Dynamic item: Appears only if “6FAN” is configured as “2SPEED” under Parameter Settings — I/O Configurations on page 44.

2…10V; increment by 0.1

Damper minimum position when fan runs at a high speed. Dynamic item: Appears only if “6FAN” is configured as “1SPEED” or “2SPEED”.

2…10V; increment by 0.1

DCV maximum position when fan runs at a low speed.
Dynamic item: Appears only if a CO2 sensor is configured and “6FAN” is configured as “2SPEED”.

2…10V; increment by 0.1

DCV maximum position when fan runs at a high speed.
Dynamic item: Appears only if a CO2 sensor is configured and “6FAN” is configured as “1SPEED” or “2SPEED”.

2…10V; increment by 0.1

DCV minimum position when fan runs at a low speed.
Dynamic item: Appears only if a CO2 sensor is configured and “6FAN” is configured as “2SPEED”.

2…10V; increment by 0.1

DCV minimum position when fan runs at a high speed.
Dynamic item: Appears only if a CO2 sensor is configured and “6FAN” is configured as “1SPEED” or “2SPEED”.

2…10V; increment by 0.1

Air Flow Chart: CFM commissioning can only be initiated from the mobile

application. When CFM commissioning is in progress, the local device

—

reads “CFM COMM”.

Temperature unit (°F or °C).

—

Fan cfm.

100…50,000cfm; increment by 100

Exhaust Fan 1 low-speed parameter setting. Dynamic item: Appears only if: · Exhaust Fan 1 is configured. · “6FAN” is configured as “2SPEED”.

0…100%; increment by 1

Exhaust Fan 1 high-speed parameter setting. Dynamic item: Appears only if: · Exhaust Fan 1 is configured. · “6FAN” is configured as “1SPEED” or “2SPEED”.

0…100%; increment by 1

Exhaust Fan 2 low-speed parameter setting. Dynamic item: Appears only if: · Exhaust Fan 2 is configured. · “6FAN” is configured as “2SPEED”.

0…100%

Exhaust Fan 2 high-speed parameter setting. Dynamic item: Appears only if: · Exhaust Fan 2 is configured. · “6FAN” is configured as “1SPEED” or “2SPEED”.

0…100%; increment by 1

Temperature high limitation. Dynamic item: Appears only if an RAT sensor is configured.

0…100%; increment by 1

Enthalpy high limitation. Dynamic item: Appears only if an RAH sensor is configured.

30…50 Btu/lbm; increment by 1

Cooling delay via increasing fan speed.

0…30 min; increment by 1

DEFAULT 63°F
28 Btu/lbm
1100PPM
3.6V 2.8V 3.6V 3.6V 3.1V 2.3V
— °F 5000cfm 65%
50%
80%
75% 83% 33 Btu/lbm 5 min.

43

Table 18 — Parameter Settings — Advanced

PARAMETER 3FREEZE POS

DESCRIPTION Anti-freeze protection damper position (closed or minimum).

3SD ACT POS Damper position during shutdown (open or closed).

3DIF T LOC

MAT sensor location: · Choose MAT if the sensor is installed before the DX (Direct Expansion) coil. · Choose LAT if the sensor is installed after the DX coil. · Choose AUTO to let the economizer controller automatically detect the location.

3LAT LOW

Low limit of leaving air temperature. Dynamic item: Appears only if LAT or AUTO is selected for 3DIF T LOC.

3LAT HIGH

High limit of leaving air temperature. Dynamic item: Appears only if LAT or AUTO is selected for 3DIF T LOC.

3OAT CAL

OAT sensor calibration.

3RAT CAL

RAT sensor calibration. Dynamic item: Appears only if an RAT sensor is configured.

3OAH CAL

OAH sensor calibration. Dynamic item: Appears only if an OAH sensor is configured.

3RAH CAL

RAH sensor calibration. Dynamic item: Appears only if an RAH sensor is configured.

3MAT CAL

MAT or LAT sensor calibration.

3MAT SET

Setpoint of MAT or LAT sensor.

3FRZ PROT

Anti-freeze protection setpoint of MAT sensor.

3ACT TOLR

Actuator tolerance setpoint between output (in percent) and feedback (in percent).

3OAT LOCK

OAT lockout set point for anti-freeze protection.

3OAT LCKOVRD

When OAT LOCKOUT is enabled, choose to override the cooling lockout function or not.

3OAT LOCKODLY Indicates the overridden time if “YES” is selected for “3OAT LCKOVRD”.

VALUE/RANGE CLO MIN CLO OPN MAT LAT AUTO
35…65°F; increment by 1
70…180°F; increment by 1 ­2.5…2.5°F; increment by 0.5 ­2.5…2.5°F; increment by 0.5
­10…10%; increment by 0.5
­2.5…2.5°F; increment by 0.5 38…70°F; increment by 1 35…55°F; increment by 1 0…15%; increment by 1 ­45…80°F; increment by 1 YES NO 0…300 min; increment by 1

DEFAULT CLO CLO
LAT
45°F 80°F 0°F
—
0%
0°F 53°F 45°F 8% 32°F NO 45 min.

PARAMETER 6OCC
6AUX1-I
6AUX2-I
6OAT SIG 6RAT SIG 6OAH SIG 6RAH SIG 6MAT SIG 6AUX-AI1 6X-AI1 SIG 6CO2 Rng L 6C02 Rng H 6AUX-AI2

Table 19 — Parameter Settings — I/O Configurations

DESCRIPTION Configures whether occupancy status receives signal from the connected thermostat or is displayed as ALWAYS in the economizer controller. Auxiliary DI-1. Configurable as: · None · Heat Conventional (W1) from thermostat · Heat pump (reversing valve O) · Heat pump (reversing valve B) · Pre-occupancy signal from thermostat · Shutdown signal from unit Auxiliary DI-2. Configurable as: · None · Heat stage 1 (W1) from thermostat · Heat pump (reversing valve O) · Heat pump (reversing valve B) · Pre-occupancy signal from thermostat · Shutdown signal from unit NOTE: Whichever is chosen for 6AUX1-I does not appear in the list of 6AUX2-I.
Configures signal type of OAT sensor.
Configures signal type of RAT sensor.
Configures signal type of OAH sensor.
Configures signal type of RAH sensor.
Configures signal type of MAT or LAT sensor.
Auxiliary AI-1. Configurable as: · CO2 sensor · Static pressure (temporarily for cfm commissioning) sensor · None
Configures CO2 sensor type. Dynamic item: Appears only if “CO2” is selected for “6AUX-AI1”.
Configures the low limit of CO2 measuring range. Dynamic item: Appears only if “CO2” is selected for “6AUX-AI1”. Configures the high limit of CO2 measuring range. Dynamic item: Appears only if “CO2” is selected for “6AUX-AI1”. Choose ACT FB if feedback signal is available from the connected damper actuator. Otherwise, choose NONE.

VALUE T-STAT ALWAYS
NONE HP(O) HP(B) PREOCC SHUTDWN
NONE W1
HP(O) HP(B) PREOCC SHUTDWN
0-10V NTC10K
0-10V NTC10K NONE
0-10V 4-20mA NONE 0-10V NTC10K
PRESSURE CO2 NONE
0-10V 2-10V 0-5V
0…500; increment by 10
1000…3000; increment by 50
ACT FB NONE

DEFAULT T-STAT
W1
NONE
NTC10K NONE NONE NTC10K NONE 0-10V
0 2000 ACT FB

44

Table 19 — Parameter Settings — I/O Configurations (cont)

PARAMETER 6Y2O 6AUX1-O
6AUX2-O 6RS485

DESCRIPTION
Choose “COOL 2” if Cooling Stage 2 is available (another compressor is connected to the Economizer). Otherwise, choose “NONE”.
Auxiliary DO-1. Configurable as: · None. · Exhaust fan (1 or 2). · Alarm output to thermostat (Title 24).
Auxiliary DO-2. Configurable as: · None. · Exhaust fan (1 or 2). · Alarm output to thermostat (Title 24). NOTE: Except for Exhaust Fan, whichever is chosen for 6AUX1-O does not appear in the list of 6AUX2-O.
Switch between MSTP and Modbus.

VALUE COOL 2 NONE
NONE ALARM EXHAUST
NONE ALARM EXHAUST
MSTP MODBUSSLV

DEFAULT COOL 2 EXHAUST
ALARM MSTP

Table 20 — Alarm Parametersa,b

PARAMETER NO ALARM 4MAT SEN ALARM 4CO2 SEN ALARM 4OAT SEN ALARM 4OAH SEN ALARM 4RAT SEN ALARM 4RAH SEN ALARM 4FREEZE ALARM 4RTU SHUTDOWN 4ACTUATOR ALARM 4ACT UNDER V 4ACT OVER V 4ACT STALLED 4ACT SLIPPING 4NOT ECON 4ECON SHOULDNT 4EXCESS OA 4LLA ALARM 4HLA ALARM

DESCRIPTION No alarm is activated. MAT sensor has failed, gone out of range, or become disconnected. CO2 sensor has failed, gone out of range, or become disconnected. OAT sensor has failed, gone out of range, or become disconnected. OAH sensor has failed, gone out of range, or become disconnected. RAT sensor has failed, gone out of range, or become disconnected. RAH sensor has failed, gone out of range, or become disconnected. Anti-freeze notification when MAT sensor is below anti-freeze protection setpoint. Notification of Shutdown Active when SHUTDWN is chosen for 6AUX1-I or 6AUX2-I. Actuator gets disconnected or has failed. Voltage received by the actuator is below expected range. Voltage received by the actuator is above expected range. Damper actuator stopped before achieving commanded position. Damper actuator slips after reaching commanded position. Not economizing when it should. Economizing when it should not. Excess outdoor air. Outside air intake is significantly higher than it should be. Leaving air temperature is lower than the low limit (3LAT LOW). Leaving air temperature is higher than the high limit (3LAT HIGH).

NOTE(S):
a. All alarms are dynamic items. An alarm appears only if a related symptom mentioned above is detected. b. An alarm activation triggers a general alarm and then the configured system alarm output (AUX1-O or AUX2-O) is activated. If there is no alarm, then NO ALARM is
displayed on the HMI.

PARAMETER 7DAMPER MIN POS 7DAMPER CLOSE 7DAMPER OPEN 7DAMPER ALL 7DAMPER 7Y1O
7Y2O
7AUX1-O 7AUX2-O

Table 21 — Test Commands
DESCRIPTION Press Enter to test whether the economizer controller can drive damper to minimum position. Press Enter to test whether the economizer controller can drive damper to 100% Closed. Press Enter to test whether the economizer controller can drive damper to 100% Open. Press Enter to perform all the above tests. Press Enter to test whether the economizer controller can drive damper to the selected voltage. Press Enter to test whether the economizer controller can turn on or off the first stage of cooling (close or open relay Y1O). Press Enter to test whether the economizer controller can turn on or off the second stage of cooling (close or open relay Y2O). Press Enter to test AUX1-O connection (close or open relay AUX1-O). Press Enter to test AUX2-O connection (close or open relay AUX2-O).

45

8RUN STATE 8ENTER RUN?

PARAMETER

8FACTORY DEF

8DEF CONFIRM? 8ACT CNT RESET 8VER x.x.x

PARAMETER 5CONFIG STATE 5ENTER CONFIG? 5RESTART 5CONF RESTART

Table 22 — Enter Running State
DESCRIPTION Change to Running State. Press Enter to confirm the change. Confirm the change to Running State. Perform factory reset. Press Enter to confirm the reset. (This action resets the controller password to default: OneBT.) Confirm the factory resetting. Damper count reset. Firmware version information such as 0.1.10.
Table 23 — Enter Configuration State and Restart
DESCRIPTION Change to Configuration State. Press Enter to confirm the change. Confirm the change to Configuration State. Restart the economizer controller. Press Enter to confirm the restart. Confirm the restart.

INSTALLING OPTIONAL HH57LW001 SINGLE
OUTSIDE AIR ENTHALPY SENSOR
When using the HH57LW001 enthalpy sensor (see Fig. 59) for outside air changeover, the existing HH79NZ039 dry bulb sensor (see Fig. 60) must be removed. The enthalpy sensor will be mounted in the same location as the dry bulb sensor (see Fig. 61). When the enthalpy sensor’s OA (Outside Air) temperature, enthalpy, and dew point are below their respective setpoints, the outside air can be used for free cooling. When any of these are above the setpoint, free cooling will not be available. Enthalpy setpoints are configurable and create an enthalpy boundary according to the user’s input. For additional details, see Fig. 62-63 and Table 24.

Harness 48TC005213 is required to be connected between the EconomizerONE harness in the return air chamber. Harness 48TC005213 has a 5-pin plug that connects directly to the HH57LW001 enthalpy sensor.
Enthalpy Control Sensor Configuration
The optional enthalpy control sensor (P/N: HH57LW001) communicates with the POL224 economizer controller using the 5-wire harness, 48TC005213. The HH57LW001 sensor can be used as a single outside air enthalpy, a differential return enthalpy, or a differential return temperature sensor. Refer to the base unit control wiring diagrams found earlier in this book to wire the HH57LW001 enthalpy sensor for each option. Use Fig. 59 and Table 26 on page 49 to locate the wiring terminals for each enthalpy control sensor.

46

Fig. 59 — HH57LW001 Dimensional, Connection and Switching Information

Fig. 60 — HH79NZ039 Dry Bulb and Mixed Air Sensor Wiring

Actuator

Wiring Harness

16

1

2

11

HH79NZ039 Outside Air Temperature Sensor
Outside Air Damper
Fig. 61 — EconomizerONE Component Locations (CRECOMZR108A00 Shown) 47

12

16 3

4

13

16

14 5

6 9

10
8 7 14

15 15

Fig. 62 — California Title 24 Zones

U.S. and Canada I-Codes / ASHRAE Zones

Climate Zone 1

Climate Zone 5 and Marine

Climate Zone 2

Climate Zone 6

Climate Zone 3

Climate Zone 7 and 8

Climate Zone 4 (Except Marine)

Fig. 63 — U.S. and Canada Climate Zones

Table 24 — Enthalpy Manual Entry Setpoints for EconomizerONE Per Climate Zone

CLIMATE ZONESa 2 TEMP OFF

1 2 3 4 5 6 7 and 8 CALIFORNIA TITLE 24 ZONESb 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 CONTROLLER DEFAULT SETTINGS DEFAULT SET POINTS

65°F 65°F 65°F 65°F 70°F 70°F 75°F
2 TEMP OFF
75°F 73°F 75°F 73°F 75°F 71°F 69°F 71°F 71°F 73°F 75°F 75°F 75°F 75°F 75°F 75°F
2 TEMP OFF
63°F

LOWEST SETTING 22 Btu/lbm 22 Btu/lbm 22 Btu/lbm 22 Btu/lbm 22 Btu/lbm 22 Btu/lbm 22 Btu/lbm LOWEST SETTING 22 Btu/lbm 22 Btu/lbm 22 Btu/lbm 22 Btu/lbm 22 Btu/lbm 22 Btu/lbm 22 Btu/lbm 22 Btu/lbm 22 Btu/lbm 22 Btu/lbm 22 Btu/lbm 22 Btu/lbm 22 Btu/lbm 22 Btu/lbm 22 Btu/lbm 22 Btu/lbm
—
—

NOTE(S):
a. See Fig. 63 for map of U.S. and Canada climate zones. b. See Fig. 62 for map of California Title 24 zones.

RH%
43% 43% 43% 43% 28% 28% 19%
RH%
19% 22% 19% 22% 19% 28% 32% 28% 28% 22% 19% 19% 19% 19% 19% 19%
—
—

2 ENTH OFF
28 Btu/lbm 28 Btu/lbm 28 Btu/lbm 28 Btu/lbm 28 Btu/lbm 28 Btu/lbm 28 Btu/lbm
2 ENTH OFF
28 Btu/lbm 28 Btu/lbm 28 Btu/lbm 28 Btu/lbm 28 Btu/lbm 28 Btu/lbm 28 Btu/lbm 28 Btu/lbm 28 Btu/lbm 28 Btu/lbm 28 Btu/lbm 28 Btu/lbm 28 Btu/lbm 28 Btu/lbm 28 Btu/lbm 28 Btu/lbm
2 ENTH OFF
28 Btu/lbm

RH%
86% 86% 86% 86% 65% 65% 50%
RH%
50% 55% 55% 55% 50% 62% 68% 62% 62% 55% 50% 50% 50% 50% 50% 50%
—
94%

2THL
83°F 83°F 83°F 83°F 83°F 83°F 83°F
2THL
83°F 83°F 83°F 83°F 83°F 83°F 83°F 83°F 83°F 83°F 83°F 83°F 83°F 83°F 83°F 83°F
2THL
83°F

2EHL
33 Btu/lbm 33 Btu/lbm 33 Btu/lbm 33 Btu/lbm 33 Btu/lbm 33 Btu/lbm 33 Btu/lbm
2EHL
33 Btu/lbm 33 Btu/lbm 33 Btu/lbm 33 Btu/lbm 33 Btu/lbm 33 Btu/lbm 33 Btu/lbm 33 Btu/lbm 33 Btu/lbm 33 Btu/lbm 33 Btu/lbm 33 Btu/lbm 33 Btu/lbm 33 Btu/lbm 33 Btu/lbm 33 Btu/lbm
2EHL
33 Btu/lbm

RH%
48% 48% 48% 48% 48% 48% 48%
RH%
48% 48% 48% 48% 48% 48% 48% 48% 48% 48% 48% 48% 48% 48% 48% 48%
RH%
48%

48

Economizers are shipped standard with an HH79NZ039 outside air dry bulb sensor (see Fig. 60). System default setting (high temp limit) is 63°F (17°C) and has a range of 48°F to 80°F (9°C to 27°C). Sensor is factory installed on economizer.
NOTE: A second HH79NZ039 sensor is provided for mixed air temperature.
NOTE: California high temperature setting requirements by region are shown in Table 25.
Enthalpy Settings (Enthalpy Option)
If installing the optional HH57LW001 enthalpy sensor, the HH79NZ039 dry bulb outside air sensor must first be removed. Wire sensor to harness 48TC005213 and the (5) wires from the harness to the EconomizerONE harness in the return air chamber. Harness 48TC005213 has a 5-pin plug that connects directly to the HH57LW001 enthalpy sensor. Refer to the base unit control wiring diagrams earlier in this book for wiring connections. Refer to Fig. 59 and Table 26.
California’s Title 24 High Temperature Limit Settings
California’s Title 24 code requires a high temperature limit setting for all dry bulb outside air economizer changeover. The temperatures vary by the region within California. See Table 25 for high limit settings.

Table 25 — California Title 24 Regional High Limit Dry Bulb Temperature Settingsa

DEVICE TYPEb
FIXED DRY BULB
DIFFERENTIAL DRY BULB
FIXED ENTHALPYc + FIXED DRY
BULB

CLIMATE ZONES 1, 3, 5, 11-16 2, 4, 10 6, 8, 9
7 1, 3, 5, 11-16
2, 4, 10
6, 8, 9
7
All

REQUIRED HIGH LIMIT (ECONOMIZER OFF WHEN):
DESCRIPTION OAT exceeds 75°F (23.8°C) OAT exceeds 73°F (22.7°C) OAT exceeds 71°F (21.6°C) OAT exceeds 69°F (20.5°C)
OAT exceeds RA temperature OAT exceeds return air temperature ­2°F (­18.8°C) OAT exceeds return air temperature
­4°F (­20°C) OAT exceeds return air temperature
­6°F (­21.1°C)
OAT exceeds 28 Btu/lb of dry airb or OAT exceeds 75°F (23.8°C)

NOTE(S):
a. This table sourced from 2019 California Energy Code, Title 24, Part 6, Table 140.4-E Air Economizer High Limit Shut Off Control Requirements.
b. Only the high limit control devices listed are allowed to be used and at the set points listed. Others such as Dew Point, Fixed Enthalpy, Electronic Enthalpy, and Differential Enthalpy Controls, may not be used in any climate zone for compliance with Section 140.4(e)1 unless approval for use is provided by the Energy Commission Executive Director.
c. At altitudes substantially different than sea level, the Fixed Enthalpy limit value shall be set to the enthalpy value at 75°F and 50% relative humidity. As an example, at approximately 6,000 foot elevation, the fixed enthalpy limit is approximately 30.7 Btu/lb.

LEGEND
OAT — RA —

Outdoor-air Thermostat Return Air

Table 26 — HH57LW001 Sensor Wiring Terminations

NUMBER 1 2 3 4 5

TERMINAL

LABEL TCOM TSIG HSIG HCOM H24V

TYPE
NTC 10k NTC 10k 0-10 vdc COMMON 24 vac

DESCRIPTION
Outside Air Temperature Sensor Output Outside Air Temperature Sensor Output Outside Air Relative Humidity Sensor Output
Sensor 24-v Common Input Sensor 24-v Operating Voltage Input

49

CHECKOUT
Inspect all wiring connections at the economizer module’s terminals, and verify compliance with the installation wiring diagrams. For checkout, review the Status of each configured parameter and perform the Test Commands tests (refer to Table 21). For information about menu navigation and use of the keypad see Interface Overview on page 31.
WARNING
ELECTRIC SHOCK HAZARD Failure to follow this warning could result in personal injury, property damage, or death. Before performing service or maintenance operations on unit, always turn off main power switch to unit and install lock(s) and lockout tag(s). Unit may have more than one power switch. Ensure electrical service to rooftop unit agrees with voltage and amperage listed on the unit rating plate. If any wiring changes are required, first be sure to remove power from the economizer module before starting work. Pay particular attention to verifying the power connection (24 vac).
Power Up After the POL224 module is mounted and wired, apply power. Initial Menu Display On initial start up, “Welcome” displays on the economizer HMI screen. After a brief pause, the Parameter Settings — I/O Configuration (refer to Table 19) of the software appears, allowing the user to check that presets and default values are configured correctly.
Power Loss (Outage or Brownout) All set points and advanced settings are restored after any power loss or interruption. NOTE: All settings are stored in non-volatile flash memory.

Status Use the Status menu (refer to Table 16) to check the parameter values for the various devices and sensors configured. NOTE: For information about menu navigation and use of the keypad, see Interface Overview on page 31.
Checkout Tests Use the Test Commands menu (refer to Table 21) to test the damper operation and any configured outputs. Only items that are configured are shown in the Test Commands menu. NOTE: For information about menu navigation and use of the keypad, see Interface Overview on page 31. To perform a Test Command test: 1. Scroll to the desired test in Test Command menu 7 using the
Up and Down buttons. 2. Press the Enter button to select the item. RUN? appears.
3. Press the Enter button to start the test. The unit pauses and then displays IN PROGRESS. When the test is complete, DONE appears.
4. When all desired parameters have been tested, press Enter + Up to end the test.
The Checkout tests can all be performed at the time of installation or at any time during the operation of the system as a test that the system is operable.
CAUTION
EQUIPMENT DAMAGE HAZARD Failure to follow this caution may result in equipment damage. Be sure to allow enough time for compressor start-up and shutdown between checkout tests so that you do not shortcycle the compressors.

50

TROUBLESHOOTING For EconomizerONE troubleshooting issues see Table 27.

Table 27 — Operating Issues and Concerns

SYMPTOM

REASON

SOLUTION

An alarm is displayed on the Sensor, damper, or the whole working

LCD

system may not work properly

Check sensor, damper, or the whole working system following the detailed alarm information.

DAC LED is blinking RED Damper slippage

Check whether the damper works properly.

DAC LED is blinking RED quickly

Damper unplugged

Check whether the damper is connected.

DAC LED is OFF

Terminal ACT-FB is configured but there is no available feedback signal

Check whether the feedback signal is connected; check if ACT-FB is faulty.

Shutoff SP setting error

Economizer controller has

no alarm, but the Free

OA temp is too low

Cooling LED will not turn on

when the OA seems to be

suitable for Free Cooling

OA temp is too high or too humid

Shutoff temperature and/or enthalpy set point is incorrectly set up. Consult an HVAC professional to set up the shutoff set point correctly.
The OA temperature is too low; therefore, there is no cooling demand. This could possibly enable anti-freeze protection.
In DIFF mode, even though OA temperature is lower than RA temperature, if both OA and RA temperatures exceed the high limit, then Free Cooling turns off. In Differential Enthalpy control mode, even though OA enthalpy is lower than RA enthalpy, if both OA and RA enthalpy exceed the high limit, then Free Cooling turns off.

No input power

Use a multi-meter to check whether there is 24 vac ± 25% (18-30 vac) at the POWER terminals. If there is no voltage or if the voltage is significantly low, then check the transformer output voltage at the RTU. If 24-v is not present at the transformer secondary side, then check the primary line voltage to the transformer. If the line voltage is not present at the transformer primary side, then check the primary power to the RTU, fuses, circuit breaker, and so on.

Economizer controller/ mechanical cooling is not operating

Brownout
Y1/Y2 signal is missing from the thermostat

If voltage is below 17-v, then the economizer controller may be in Brownout Protection mode. This mode disables all of the relay outputs. When the power is 19 vac or higher, the economizer controller and RTU operate normally.
Mechanical cooling does not run until there is cooling demand (Y1/Y2 Active). Check the wiring from Y1I and Y2I terminals to the commercial thermostat. 24-v should be present between Y1I/ Y2I and Y1O/Y2O respectively.

24 vac~ and 24 vac are incorrectly wired

24 vac power supply has polarity when all devices are powered by the same 24 vac transformer; reversing polarity may cause a short circuit that can damage the system. Follow the transformer polarity mark, check the wiring of 24-v~ (or G or 24-v+), and ensure that they are tied to the same polar of 24 vac power supply; while checking the wiring of (or G0 or 24-v- or COM), ensure that they are all tied to another polar of 24 vac power supply.

Firmware update failure

Application file is damaged, operation is incorrect, and/or USB flash disk does not work properly

Reload a BIN file, restart the controller, update firmwarea, or change a USB flash disk. Contact service provider if failure still exists.

Free Cooling LED is solid RED

Sensor, damper, or whole working system may not work properly

Check sensor, damper, or the whole working system following the detailed alarm information.

Free Cooling LED is blinking RED

Not economizing when it should

Check the whole economizer working system, such as the sensor, damper, and thermostat.

Incorrect controller password error on mobile application

For CO2 and single enthalpy (control mode 3) configurations from the factory, the password has changed

For units coming from the factory with CO2 configuration or single enthalpy (control mode 3), use the controller password OneBT2.1. For all other units, use the controller password OneBT. Performing a factory reset on the controller will also reset the password to OneBT.

RS485 communication failure

RS485 signal or configuration error

Check wiring, configuration, Baud Rate (using mobile application), and other network communication parameters.

Sensor LED is blinking RED Excess outdoor air

Check the whole economizer working system, such as the sensor, damper, and thermostat.

Mixed Air (MA) sensor error

Check the MA sensor. It must be either a Type II NTC 10K or 0-10 vdc sensor.

Sensor LED is solid RED

Outside Air (OA)/Return Air (RA) sensor error

Check the wiring and signal of the OA sensor. If in Differential (DIFF) mode, also check the RA sensor. The following sensor signals are valid: Type II NTC 10K or 0-10 vdc temperature. 0-10 vdc or 4-20 mA humidity.

Air temperature failure/fault

Check the air temperature sensor signal. The valid signal must be Type II NTC 10K or 0-10 vdc.

Sensor LED is OFF

CO2 sensor error

Check CO2 sensor connection, sensor signal (under range or over range), and sensor signal type.

Sensor LED is YELLOW

Humidity sensor error

Check humidity sensor connection, sensor signal (under range or over range), and sensor signal type.

Wi-Fi connection failure

Wi-Fi/WLAN stick error or wrong user name and password

Unplug and re-plug in the Wi-Fi/WLAN stick, enter a correct user name and password, restart the controller, or replace the Wi-Fi/WLAN stick. If the Wi- Fi/WLAN stick is POL903.00/100, then the default user name and password are Siemens-WLAN-Stick and SIBPAdmin. DNS name is siemens.wlanstick. Contact Application Engineering for information on this accessory.

NOTE(S):
a. Back up configurations before firmware update. All the previous configuration data is erased after firmware update. Contact Application Engineering for more information on support for firmware. IMPORTANT: If the controller enters the configuration state for the convenience of I/O configurations, then users can manually switch to the running state after finishing configurations. To do so, press Enter + Up at the same time, then press Enter to confirm the switch after 8RUN STATE appears on the LCD.

51

SystemVuTM Controller (Factory Option)
For details on operating 50FCQ*08-12 units equipped with the factory-installed SystemVu controller option refer to the FCQ/ GCQ Series Single Package Rooftop Units with SystemVu Controller Controls, Start-up, Operation and Troubleshooting manual.
Controller Options
LOW AMBIENT
If the unit comes with Electro-Mechanical (EM) control, then no adjustment is necessary.
If the unit comes with SystemVu controller option, then refer to its installation control manual for details on adjusting “Cooling LockOut” setting and configure for the specific job requirements.
Smoke Detectors
Smoke detectors are available as factory-installed options on 50FCQ models. Smoke detectors may be specified for Supply Air only or for Return Air without or with economizer, or in combination of Supply Air and Return Air. Return Air smoke detectors are arranged for vertical return configurations only. All components necessary for operation are factory-provided and mounted. The unit is factory-configured for immediate smoke detector shutdown operation; additional wiring or modifications to unit terminal board may be necessary to complete the unit and smoke detector configuration to meet project requirements.
Units equipped with factory-optional Return Air smoke detectors require a relocation of the sensor module at unit installation. See Fig. 64 for the as- shipped location.

Return Air Smoke Detector (As Shipped)
Fig. 64 — Return Air Smoke Detector, Shipping Position
COMPLETING RETURN AIR SMOKE SENSOR INSTALLATION 1. Unscrew the two screws holding the Return Air Smoke
Detector assembly. See Fig. 65, Step 1. Save the screws. 2. Turn the assembly 90 degrees and then rotate end to end.
Make sure that the elbow fitting is pointing down. See Fig. 65, Step 2. 3. Screw the sensor and detector plate into its operating position using screws from Step 1. See Fig. 65, Step 3. 4. Connect the flexible tube on the sampling inlet to the sampling tube on the basepan. ADDITIONAL APPLICATION DATA Refer to the application data document “Factory Installed Smoke Detectors for Small and Medium Rooftop Units 2 to 25 Tons” for discussions on additional control features of these smoke detectors including multiple unit coordination.

Step 1

Step 2 Fig. 65 — Completing Installation of Return Air Smoke Sensor

Step 3

52

Step 11 — Adjust Factory-Installed Options
SMOKE DETECTORS
Smoke detector(s) will be connected at the Unit Control Board (UCB), at terminals marked “Smoke Shutdown.” Detach the jumper covering the Smoke Shutdown terminals on the UCB and then attach the wiring harness from the smoke detector.
ECONOMIZERONE OCCUPANCY SWITCH
External occupancy control is managed through a connection on the Unit Control Board If external occupancy control is desired, connect a time clock or remotely controlled switch (closed for Occupied, open for Unoccupied sequence) at terminals marked OCCUPANCY. Detach the jumper covering the “Occupancy” terminals on the UCB and then attach the required connections.
Step 12 — Install Accessories
Available accessories include: · Roof curb · Thru-base connection kit (must be installed before unit is
set on curb) · Manual outside air damper · Two-Position motorized outside air damper · EconomizerONE (with POL224 control) · EconoMi$er2 (without control/for external signal and
integrated barometric relief) · Power exhaust · Differential dry-bulb sensor (EconomizerONE) · Outdoor enthalpy sensor · Differential enthalpy sensor · Electric heaters · Single point kits · Low Ambient Controls · Thermostat / Sensors · CO2 sensor · Louvered hail guard · Phase monitor control Refer to separate installation instructions for information on installing these accessories.
Step 13 — Fan Speed Set Up
UNITS WITH ELECTRO-MECHANICAL CONTROLS
The Fan Speed set up controls are located on the lower section of the Unit Control Board (UCB). See Fig. 66 for location. 1. Check the job specifications for the CFM (cubic feet per
minute) and ESP (external static pressure) required.

2. Using the chart on the Fan Speed Set Up labels (see Fig. 67), calculate the Vdc from the CFM and ESP for the base unit plus any field accessories (as listed on the label). NOTE: The Fan Speed Set Up labels are located on the High Voltage cover in the Control Box.
3. Connect a multimeter to the Vdc terminals on the UCB. 4. Set the Range Switch to either A, B, or C per the Switch
Range table. 5. Using a straight blade screwdriver turn the Vdc control dial to
fine tune the Vdc reading. 6. Record the reading in the Field Setting field.
Fan Speed Set Up Controls
Fig. 66 — UCB Fan Speed Controls

53

VDC Calculator

ESP in. wg

0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0

1500 5.4 6.2 6.9 7.5 8.1 8.6 9.1 9.6

UNIT MODEL NUMBER CFM

1625 5.8 6.5 7.1 7.7 8.3 8.8 9.3 9.8

1750 6.1 6.8 7.4 8.0 8.5 9.0 9.5 9.9

1875 6.5 7.1 7.7 8.2 8.7 9.2 9.7

2000 6.8 7.4 7.9 8.5 9.0 9.5 9.9

2125 7.2 7.7 8.2 8.7 9.2 9.7

2250 7.6 8.0 8.5 9.0 9.5 10.0

2375 7.9 8.4 8.8 9.3 9.8

2500 8.3 8.7 9.2 9.6

Field Accessories:

Economizer 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 1 Stage E Heat 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 2 Stage E Heat 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3

Factory Setting: 9.0 VDC
Field Setting:
Record field setting here
V
Switch Range: * ABC
A 4.1 – 7.5 B 6.9 – 8.7 C 7.7 – 10.0

• Overlap in A, B, C switch range designed for maximum field adjustment potential. For example 7.2 can be set at either A or B.

NOTE: Values in the Field Accessories section are VDC adders.

Fig. 67 — Example of Fan Speed Set Up Labels for Electro-Mechanical Controls

UNITS WITH SYSTEMVUTM CONTROLS
On units equipped with the factory-installed SystemVu controller the Fan Speed settings are accessed through the SystemVu interface.
1. Check the job specifications for the CFM (cubic feet per minute) and ESP (external static pressure) required.
2. Using the chart on the Fan Speed Set Up labels (see Fig. 68), calculate the RPM from the CFM and ESP for the base unit plus any field accessories (as listed on the label).
NOTE: The Fan Speed Set Up labels are located on the High Voltage cover in the Control Box.
3. Press any key on the SystemVu interface to activate the display backlight and then press the MENU key.
4. Using the UP and DOWN arrow keys highlight SETTINGS and then press ENTER.
5. Use the DOWN arrow key highlight the UNIT CONFIGURATIONS menu then press ENTER.

6. Highlight UNIT CONFIGURATIONS then press ENTER.
7. Highlight INDOOR FAN and then press ENTER.
8. Refer to the job specifications to set the following, determining the values per the RPM Calculator label (see Fig. 68). Use the UP and DOWN arrow keys and the BACK key to set the values. Press ENTER after setting each value to continue to the next selection.
· IDF VENT SPD
· IDF HEAT SPD
· IDF LOW COOL SPD · IDF HIGH SPD
· IDF FREE COOL SPD
For further details see the FCQ/GCQ Series Single Package Rooftop Units with SystemVu Controller Controls, Start-up, Operation and Troubleshooting manual.

54

A

RPM Calculator

ESP in. wg

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

1500 1301 1477 1639 1788 1925 2054 2174 2289

UNIT MODEL NUMBER CFM

1625 1381 1544 1699 1843 1976 2101 2220 2332

1750 1463 1615 1763 1902 2031 2152 2268 2378

1875 1548 1688 1828 1962 2087 2206 2318

2000 1633 1764 1897 2025 2146 2262 2372

2125 1720 1842 1967 2090 2208 2320

2250 1808 1921 2040 2157 2271 2380

2375 1897 2003 2115 2227 2336

2500 1987 2068 2191 2298

Field Accessories:

Economizer 66

66

66

66

66

66

66

66

1 Stage E Heat 80

80

80

80

80

80

80

80

2 Stage E Heat 107 107 107 107 107 107 107 107

NOTE: Values in the Field Accessories section are VDC adders.
Fig. 68 — Example of Fan Speed Set Up Labels for SystemVuTM Controls

55

Typical Unit Piping
Each heat pump system includes two compressors, a reversing valve, dual- function outdoor and indoor coils, a common liquid line with bi-flow TXV, and dedicated cooling and heating TXVs. 50GCQ07 and 08 unit outdoor coils contain a vapor header check valve. 50GCQ09 unit indoor coils contain a vapor header check valve. See Fig. 69-74 and Tables 28-33 for typical unit piping schematic parallel coil circuits during evaporator-function operation and converging coil circuits during the condenser-function operation.

Table 28 — 50GCQ*07-08 ­ Cooling Mode

COMPONENT Reversing Valve Check Valve A Check Valve B Check Valve C Check Valve D Check Valve E Check Valve F

STATUS/POSITION Energized Closed Open Open Open Closed Closed

Table 29 — 50GCQ*07-08 ­ Heating Mode

COMPONENT Reversing Valve Check Valve A Check Valve B Check Valve C Check Valve D Check Valve E Check Valve F

STATUS/POSITION De-energized Open Closed Closed Closed Open Open

Table 30 — 50GCQ*07-08 ­ Defrost Mode

COMPONENT Defrost Thermostat
Outdoor Fan(s) Reversing Valve Check Valve A Check Valve B Check Valve C Check Valve D Check Valve E Check Valve F

STATUS/POSITION Closed Off
Energized Closed Open Open Open Closed Closed

Table 31 — 50GCQ*09 ­ Cooling Mode

COMPONENT Reversing Valve Check Valve A Check Valve B Check Valve C Check Valve D Check Valve E Check Valve F

STATUS/POSITION Energized N/A Open Open Open Closed Closed

Table 32 — 50GCQ*09 ­ Heating Mode

COMPONENT Reversing Valve Check Valve A Check Valve B Check Valve C Check Valve D Check Valve E Check Valve F

STATUS/POSITION De-energized N/A Closed Closed Closed Open Open

Table 33 — 50GCQ*09 ­ Defrost Mode

COMPONENT Defrost Thermostat
Outdoor Fan(s) Reversing Valve Check Valve A Check Valve B Check Valve C Check Valve D Check Valve E Check Valve F

STATUS/POSITION Closed Off
Energized N/A Open Open Open
Closed Closed

56

F Heating TXV
DFT

Filter Drier

LPS/LOC

B

A

HPS

Reversing

Valve

C E

Cooling TXV

D

Outdoor Coil

Indoor Coil

Fig. 69 — Piping Schematic — 50GCQ*07 Cooling Mode

F Heating TXV

Filter Drier

LPS/LOC

C Cooling TXV

DFT

B

E

A

HPS

Reversing

Valve

D

Outdoor Coil

Indoor Coil

Fig. 70 — Piping Schematic — 50GCQ*07 Heating Mode

57

F Heating TXV
DFT

Filter Drier

LPS/LOC

B

A

HPS

Reversing

Valve

C E

Cooling TXV

D

Outdoor Coil

Indoor Coil

Fig. 71 — Piping Schematic — 50GCQ*08 Cooling Mode

F Heating TXV

Filter Drier

LPS/LOC

C Cooling TXV

DFT

B

E

A

HPS

Reversing

Valve

D

Outdoor Coil

Indoor Coil

Fig. 72 — Piping Schematic — 50GCQ*08 Heating Mode

58

F Heating TXV
B
DFT

Filter Drier

LPS/LOC

C E

Cooling TXV

HPS

Reversing Valve

D

Outdoor Coil

Indoor Coil

Fig. 73 — Piping Schematic — 50GCQ*09 Cooling Mode

F
Heating TXV B

Filter Drier

LPS/LOC

C E

Cooling TXV

HPS

Reversing

DFT

Valve

D

Outdoor Coil

Indoor Coil

Fig. 74 — Piping Schematic — 50GCQ*09 Heating Mode

Pre-Start and Start-Up
This completes the mechanical installation of the unit. Refer to the unit’s

References

• HVACpartners

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