Carrier WeatherMaster 50GC-14 Series Installation Instructions Manual

Single package rooftop cooling only with puron (r-410a) refrigerant and ecoblue fan technology

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CONTENTS

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1

GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Rated Indoor Airflow (cfm) . . . . . . . . . . . . . . . . . . . . . 2

Pre-Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Step 1 — Plan for Unit Location . . . . . . . . . . . . . . . . 6

• ROOF MOUNT

Step 2 — Plan for Sequence of Unit Installation . . . 6

• CURB-MOUNTED INSTALLATION

• PAD-MOUNTED INSTALLATION

• FRAME-MOUNTED INSTALLATION

Step 3 — Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . . 7

Step 4 — Provide Unit Support . . . . . . . . . . . . . . . . . 7

• ROOF CURB MOUNT

• SLAB MOUNT (HORIZONTAL UNITS ONLY)

• ALTERNATE UNIT SUPPORT (IN LIEU OF CURB 

OR SLAB MOUNT)

Step 5 — Field Fabricate Ductwork . . . . . . . . . . . . . . 7

• FOR UNITS WITH ACCESSORY ELECTRIC 

HEATERS

Step 6 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . 9

• POSITIONING ON CURB

Step 7 — Convert to Horizontal and Connect . . . . 10

• ALL UNITS

Step 8 — Install Outside Air Hood . . . . . . . . . . . . . . 10

• ECONOMIZER HOOD REMOVAL (FACTORY

OPTION)

• TWO-POSITION DAMPER HOOD REMOVAL 

(FACTORY OPTION)

• ECONOMIZER AND TWO-POSITION DAMPER 

HOOD SETUP

Step 9 — Install External Condensate Trap and

Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Step 10 — Make Electrical Connections . . . . . . . . . 12

• FIELD WIRING

• UNITS WITHOUT FACTORY-INSTALLED

NON-FUSED DISCONNECT

• CONVENIENCE OUTLETS

• ALL UNITS

• FACTORY-OPTION THRU-BASE CONNECTIONS 

(ELECTRICAL CONNECTIONS)

Electric Heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

• SINGLE POINT BOXES AND SUPPLEMENTARY

FUSES

• SINGLE POINT BOXES WITHOUT FUSES

• LOW-VOLTAGE CONTROL CONNECTIONS

• HUMIDI-MIZER

CONTROL CONNECTIONS

• TYPICAL UNIT WIRING DIAGRAMS

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

Catalog No. 04-53500402-01

Installation Instructions

Page

Printed in U.S.A.

Form No. 50GC-14-02SI Rev. C

WeatherMaster

Single Package Rooftop Cooling Only

with Puron

and EcoBlue™ Fan Technology

Humidi-MiZer Dehumidification System 

(Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

• NORMAL COOLING

• DEHUM/MECH COOLING (SUBCOOLING) MODE

• DEHUMIDIFICATION (HOT GAS REHEAT) MODE

• REHEAT CONTROL

EconomizerONE (Factory Option) . . . . . . . . . . . . . .29

• ECONOMIZER SETTINGS

• WIRING

• SETUP AND CONFIGURATION

• INSTALLING OPTIONAL HH57LW001 SINGLE 

OUTSIDE AIR ENTHALPY SENSOR

• CHECKOUT

• TROUBLESHOOTING

SystemVu™ Controller (Factory Option) . . . . . . . . .50

• SMOKE DETECTORS

• COMPLETING INSTALLATION OF RETURN-AIR

SMOKE SENSOR

• ADDITIONAL APPLICATION DATA

Step 11 — Adjust Factory-Installed Options . . . . . .51

• SMOKE DETECTORS

• ECONOMIZERONE OCCUPANCY SWITCH

Step 12 — Install Accessories . . . . . . . . . . . . . . . . .51

Step 13 — Fan Speed Set Up . . . . . . . . . . . . . . . . . .51

• UNITS WITH ELECTROMECHANICAL CONTROLS

• UNITS WITH SYSTEMVU™ CONTROLS

START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . CL-1

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can be

hazardous due to system pressure and electrical components. Only

trained and qualified service personnel should install, repair, or

service air-conditioning equipment.

Untrained personnel can perform basic maintenance functions of

cleaning coils and filters and replacing filters. All other operations

should be performed by trained service personnel. When working

on air-conditioning equipment, observe precautions in the

literature, tags and labels attached to the unit, and other safety

precautions that may apply.

Follow all safety codes. Wear safety glasses and work gloves. Use

quenching cloth for unbrazing operations. Have fire extinguisher

available for all brazing operations.

It is important to recognize safety information. This is the

safety-alert 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

Pg 1

50GC-*14

(R-410A) Refrigerant

3-24

Replaces: 50GC-14-01SI

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Summary of Contents for Carrier WeatherMaster 50GC-14 Series

Page 1 ® WeatherMaster 50GC-*14 Single Package Rooftop Cooling Only with Puron ® (R-410A) Refrigerant and EcoBlue™ Fan Technology Installation Instructions Humidi-MiZer Dehumidification System  CONTENTS (Optional) ....... .27 Page •...
Page 2 injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, CAUTION or operation. PERSONAL INJURY HAZARD Failure to follow this caution may result in personal injury. DANGER Sheet metal parts may have sharp edges or burrs. Use care and ELECTRICAL SHOCK HAZARD wear appropriate protective clothing, safety glasses and gloves Failure to follow this warning will result in personal injury or...
Page 3 Position: 9 10 11 12 13 14 15 16 17 18 Example: Unit Heat Type Packaging Compliance 50 - Cooling with Optional Electric Heat 0 = Standard Packaged Rooftop 1 = LTL ® Model Series - WeatherMaster Electrical Options GC - High Efficiency Packaged RTU A = None with EcoBlue™...
Page 4 Fig. 2 — 50GC-*14 Unit Dimensional Drawing...
Page 5 Fig. 2 — 50GC-*14 Unit Dimensional Drawing (cont)
Page 6 DIMENSION LOCATION CONDITION in. (mm) 48 (1219) Unit disconnect is mounted on panel. 18 (457) No disconnect, convenience outlet option. 18 (457) Recommended service clearance. 12 (305) Minimum clearance. 42 (1067) Surface behind servicer is grounded (e.g., metal, masonry wall). 36 (914) Surface behind servicer is electrically non-conductive (e.g., wood, fiberglass).
Page 7 CURB-MOUNTED INSTALLATION Install insulation, cant strips, roofing felt, and counter flashing as shown. Ductwork must be attached to curb and not to the unit. Install curb Install field-fabricated ductwork inside curb SLAB MOUNT (HORIZONTAL UNITS ONLY) Install accessory thru-base service connection package Provide a level concrete slab that extends a minimum of 6 in.
Page 8 Fig. 5 — 50GC-*14 Roof Curb Details...
Page 9 Place All Gasket in Place Before Placing Unit on Roof Curb. (914-1371) “B” 36”-54” “C” Detail “A” Duct End “A” “A” See Detail “A” DIMENSIONS MAX WEIGHT UNIT 50GC-*14 2079 116.0 2945 56.0 1420 59.5 1510 NOTES: 1. Dimensions in () are in millimeters. 2.
Page 10 Step 7 — Convert to Horizontal and Connect 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 using accessory CRDUCTCV002A00. To convert to horizontal configuration, remove screws from side duct opening covers and Remove Hood Parts...
Page 11 ECONOMIZER TWO-POSITION DAMPER HOOD SETUP Panel 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 Indoor Coil hood assembly.
Page 12 Minimum Pitch 1 in. (25 mm) Per Base Rail 10 ft (3 m) of Line 3 in. (76 mm) Open Vent See Note To Roof Drain Roof Drain Plug Curb NOTE: Trap should be deep enough to offset maximum unit static difference.
Page 13 Field power wires are connected to the unit at line-side pressure lugs at the main terminal block (TB1) or at factory-installed option non-fused disconnect switch. See Fig. 22. Max wire size is no. 2 AWG (copper only). See Fig. 23. WARNING FIRE HAZARD Failure to follow this warning could result in personal injury,...
Page 14 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. Units with Factory-Installed Non-Fused Disconnect or HACR Circuit Breaker The factory-installed option non-fused disconnect (NFD) switch (see Fig.
Page 15 test leads (see Fig. 26). The factory disconnect is either an 80A or 100A depending on the unit voltage, indoor motor and options. Fig. 25 — Handle and Shaft Assembly for NFD Fig. 24 — Location of Non-Fused Disconnect Enclosure To field install the NFD shaft and handle: Remove the unit front panel (see Fig.
Page 16 Turn the handle to the OFF position with red arrow point- ing at OFF. Install the handle on to the painted cover horizontally with Pwd-CO Fuse the red arrow pointing to the left. Switch Secure the handle to the painted cover with (2) screws and lock washers supplied.
Page 17 Non-powered type ALL UNITS Requires the field installation of a general-purpose 125-v 15-A Test the GFCI receptacle by pressing the TEST button on the face circuit powered from a source elsewhere in the building. Observe of the receptacle to trip and open the receptacle. Check for proper national and local codes when selecting wire size, fuse or breaker grounding wires and power line phasing if the GFCI receptacle requirements and disconnect switch size and location.
Page 18 Single Point Box installation instructions for further details. The 50GC-*14 requires an external temperature control device. This device can be a thermostat (field-supplied) or a SystemVu™ controller (available as factory-installed option for use on a Carrier Comfort Network ® or as a stand-alone control). All field-added...
Page 19 Fig. 35 — Access Panel Location Single Center Vane Axial Point Box Post Indoor Fan System Control Box Non-Fused Disconnect* Manual Reset Convenience Limit Switch Outlet* Heater Mounting Bracket Control Wire Heater * Factory-Installed Option. Terminal Block (Cover Removed) Fig. 36 — Component Location Heater Module Fig.
Page 20 SINGLE POINT BOXES AND SUPPLEMENTARY FUSES All fuses on 50GC units are 60-A. (Note that all heaters are qualified for use with a 60-A fuse, regardless of actual heater When the unit MOCP device value exceeds 60-A, unit-mounted ampacity, so only 60-A fuses are necessary.) supplementary fuses are required for each heater circuit.
Page 21 This device may be a separate humidistat control (con- tact closes on rise in space RH above control setpoint) or a com- Humidistat bination thermostat-humidistat control device such as Carrier’s Edge ® Pro Thermidistat™ device with isolated contact set for dehumidification control.
Page 22 Use the connector and the wire tie to reduce any slack in the included with the Carrier Edge Pro Thermidistat device ® thermostat cable to ensure that it will not be damaged by for more information. contact with the condenser coil.
Page 23 Fig. 44 — Typical Control Wiring Diagram, Electromechanical with POL224 Controller...
Page 24 Fig. 45 — Typical Control Wiring Diagram, SystemVu™ Controller...
Page 25 Fig. 46 — Typical Power Wiring Diagram — 208/230, 460-3-60 Unit Shown...
Page 26 Fig. 47 — Typical Power Wiring Diagram — 575-3-60 Unit Shown...
Page 27 Humidi-MiZer Dehumidification System  DEHUM/MECH COOLING (SUBCOOLING) MODE (Optional) This mode increases the latent heat removal and decreases sen- sible cooling compared to normal cooling. This occurs when Units with the factory-installed Humidi-MiZer system option there is a cooling and dehumidification demands. are capable of providing multiple modes of improved dehu- midification as a variation of the normal cooling cycle.
Page 28 Indoor Supply Valve 3-Wway Valve Condenser Coil Hot Gas Reheat Coil Outdoor Air Expansion Valve (TXV) Compressor Evaporator Coil = Closed Valve = Open Valve Indoor Return Air = 3-Way Valve Fig. 49 — Subcooling Mode – Humidi-MiZer System for 50GC 14 Indoor Supply Valve 3-Way...
Page 29 the harness are made to the C (24 vac common) and R (24 vac EconomizerONE (Factory Option) power) terminals of the economizer controller. See Fig. 53. ECONOMIZER SETTINGS LED Indication Interface Overview NOTE: If different faulty events occur at the same time, then EconomizerONE sensor/DAC LED lights up following the priority below: Red ...
Page 30 Table 5 — LED Indication FREE SENSOR Power STATUS COOLING DAC LED Yellow Yellow Yellow Commissioning mode Blinking Blinking Blinking Power start up Yellow On Yellow On Yellow On Free cooling is running Green On — — Free cooling is available Green —...
Page 31 Table 6 — Free Cooling Functions CONTROL MODE SENSORS USED ENABLE FREE COOLING? The outside air dry bulb temperature is compared with the set temperature OA (outside air) temperature sensor Control Mode 1 shutoff setpoint. • Fixed Dry bulb If the outside air dry bulb temperature is below the temperature shutoff MA (Mixed Air) temperature sensor setpoint, then the outside air is used to meet all or part of the cooling demand.
Page 32 Table 7 — 1 and 2-Stage Cooling Stage I/O Logic Table 10 — Different Fan Speeds with Different Configured Outputs ECONOMIZER COOLING COOLING CONDITION MET STAGE 1 STAGE 2 FAN TYPE 1-SPEED COOLING 2-STAGE COOLING • Spd H (regardless of •...
Page 33 Table 12 — Different Damper Position Settings with Different Configured Outputs (DCV is Enabled) FAN TYPE 1-STAGE COOLING 2-STAGE COOLING • 2VENTMIN H to 2VENTMAX H (regardless of • 2VENTMIN H to 2VENTMAX H (regardless of 1-SPEED FAN cooling demand, OCC=Yes) cooling demand, OCC=Yes) 2VENTMIN L to 2VENTMAXL ...
Page 34 Exhaust Fan Operation Users can enable this function only from the Climatix mobile ap- ™ plication if the related function is available in the current mobile Up to two exhaust fans can be connected to the economizer application version. controller. Fault Detection and Diagnostics •...
Page 35 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, sensor), thermostats, and exhaust fans can be connected to...
Page 36 Table 14 — EconomizerONE Control Wiring Settings LABEL TYPE DESCRIPTION RS485 Modbus A Line A RS485 Modbus B Line B ¬ GND_ISO Earth Ground Type II NTC 10K or 0-10 vdc Mixed or Discharge Air Temperature Sensor Mixed or Discharge Air Temperature Sensor Common Type II NTC 10K or 0-10 vdc Outside Air Temperature Sensor 0-10 vdc or 4-20mA...
Page 37 Connecting Peripheral Devices to the Economizer Controller See Fig. 58-62 for wiring details. • Outside Air: Connect to the Mixed or Discharge Air Temperature Sensor OAT and COM terminals of the Outside Air Temperature Sensor device. • Return Air (Differential): Return Air Temperature Sensor Connect to the RAT and S-COM...
Page 38 • Outside Combination Temperature/ Humidity: Connect Combo Temperature and Humidity Sensor to the OAT, COM, and OAH terminals of the device. • Combo Temperature and Humidity Sensor Return Combination Temperature/ Humidity: Connect to the RAT, S-COM, and RAH terminals of the device. Fig.
Page 39 SETUP AND CONFIGURATION NOTE: Parameters and display menus may display differently/dynamically if different applications are config- ured. See Tables 15-22. IMPORTANT: Before setup and configuration, it is recommend- ed to obtain some location-based values, such as shutoff points, IMPORTANT: Not all operations are available on the local or utilize the location services in the Climatix ™...
Page 40 Table 15 — Status Display PARAMETER DESCRIPTION VALUE 1FREECOOL Indicates whether the system can use outdoor air for free cooling. 1ECON ENAB 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;...
Page 41 Table 16 — Parameter Settings — Basic PARAMETER DESCRIPTION RANGE DEFAULT Temperature shutoff setpoint can be obtained automatically if a smartphone or tablet with the mobile application installed on it is connected to the 2 TEMP OFF 48...80°F; increment by 1 63°F network provided by a Wi-Fi/WLAN stick plugged into the economizer controller.
Page 42 Table 17 — Parameter Settings — Advanced PARAMETER DESCRIPTION VALUE/RANGE DEFAULT 3FREEZE POS Anti-freeze protection damper position (closed or minimum). 3SD ACT POS Damper position during shutdown (open or closed). MAT sensor location: • Choose MAT if the sensor is installed before the DX (Direct Expansion) coil. 3DIF T LOC •...
Page 43 Table 18 — Parameter Settings — I/O Configurations (cont) PARAMETER DESCRIPTION VALUE DEFAULT Choose “COOL 2” if Cooling Stage 2 is available (another compressor is COOL 2 6Y2O COOL 2 connected to the Economizer). Otherwise, choose “NONE”. NONE Auxiliary DO-1. Configurable as: NONE •...
Page 44 Table 21 — Enter Running State PARAMETER DESCRIPTION 8RUN STATE Change to Running State. Press Enter to confirm the change. 8ENTER RUN? Confirm the change to Running State. Perform factory reset. Press Enter to confirm the reset. (This action resets the controller 8FACTORY DEF password to default: OneBT.) 8DEF CONFIRM?
Page 45 Fig. 63 — HH57LW001 Dimensional, Connection and Switching Information Fig. 64 — HH79NZ039 Dry Bulb and Mixed Air Sensor Wiring Actuator Wiring Harness HH79NZ039 Outside Air Temperature Sensor Outside Air Damper Fig. 66 — California Title 24 Zones Fig. 65 — EconomizerONE Component Locations (CRECOMZR108A00 Shown)
Page 46 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. 67 — U.S. and Canada Climate Zones Table 23 —...
Page 47 Economizers are shipped standard with an HH79NZ039 outside Table 24 — California Title 24 Regional High Limit air dry bulb sensor (see Fig. 64). System default setting (high temp Dry Bulb Temperature Settings limit) is 63°F (17°C) and has a range of 48°F to 80°F (9°C to REQUIRED HIGH LIMIT 27°C).
Page 48 CHECKOUT Status Use the Status menu (refer to Table 15) to check the parameter Inspect all wiring connections at the economizer module’s termi- values for the various devices and sensors configured. nals, and verify compliance with the installation wiring diagrams. For checkout, review the Status of each configured parameter and NOTE: For information about menu navigation and use of the perform the Test Commands tests (refer to Table 20).
Page 49 TROUBLESHOOTING For EconomizerONE troubleshooting issues see Table 26. Table 26 — Operating Issues and Concerns SYMPTOM REASON SOLUTION An alarm is displayed on the Sensor, damper, or the whole working Check sensor, damper, or the whole working system following the detailed alarm information. system may not work properly DAC LED is blinking RED Damper slippage...
Page 50 ADDITIONAL APPLICATION DATA SystemVu™ Controller (Factory Option) For details on operating 50GC-*14 units equipped with the Refer to the application data sheet titled “Factory-Installed Smoke factory-installed SystemVu controller option, refer to the FC/GC Detector, for Small and Medium Rooftop Units 2 to 25 Tons” for Series Single Package Rooftop Units with SystemVu Controller discussions on additional control features of these smoke detectors Controls, Start-up, Operation and Troubleshooting manual.
Page 51 NOTE: The Fan Speed Set Up labels are located on the High Step 11 — Adjust Factory-Installed Options Voltage cover in the Control Box. SMOKE DETECTORS Connect a multimeter to the Vdc terminals on the UCB. Smoke detector(s) will be connected at the Unit Control Board Set the Range Switch to either A, B, or C per the Switch (UCB), at terminals marked “Smoke Shutdown.”...
Page 52 ESP in. wg Factory Setting: Calculator 9.0 V 3000 Field Setting: 3250 Record field setting here 3500 3750 4000 Switch Range: 4250 4500 4.1 - 7.5 4750 10.0 6.9 - 8.7 5000 7.7 - 10.0 Field Accessories: Economizer * Overlap in A, B, C switch range designed for maximum field adjustment potential.
Page 53 ESP in. wg Calculator 1250 1348 1441 1528 1610 1688 1762 1832 1899 1963 3000 1336 1428 1515 1598 1677 1753 1824 1893 1959 2021 3250 1423 1509 1591 1670 1746 1819 1888 1955 2020 2081 3500 1510 1591 1669 1744 1817 1887...
Page 54 © 2024 Carrier Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53500402-01 Printed in U.S.A. Form No. 50GC-14-02SI Rev. C Pg 54 3-24 Replaces: 50GC-14-01SI...
Page 55 START-UP CHECKLIST FOR 50GC-*14 SINGLE PACKAGE ROOFTOP, COOLING ONLY UNIT (Remove and use for job file) NOTE: To avoid injury to personnel and damage to equipment or property when completing the procedures listed in this start-up checklist, use good judgment, follow safe practices, and adhere to the safety considerations/information as outlined in preceding sections of this document.
Page 56 (Y/N) _____ 10. Restore set points for thermostat and humidistat. (Y/N) _____ © 2024 Carrier Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53500402-01 Printed in U.S.A.

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