Carrier WeatherMaker 50GC-17 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

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Job-Site Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Step 1 — Plan for Unit Location . . . . . . . . . . . . . . . 19

• ROOF MOUNT

Step 2 — Plan for Sequence of Unit Installation . . 19

• CURB-MOUNTED INSTALLATION

• PAD-MOUNTED INSTALLATION

• FRAME-MOUNTED INSTALLATION

Step 3 — Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . 19

Step 4 — Provide Unit Support . . . . . . . . . . . . . . . . 20

• ROOF CURB MOUNT

• SLAB MOUNT (HORIZONTAL UNITS ONLY)

• ALTERNATE UNIT SUPPORT (IN LIEU OF CURB

MOUNT)

Step 5 — Field Fabricate Ductwork . . . . . . . . . . . . . 24

• FOR UNITS WITH OPTIONAL OR ACCESSORY

ELECTRIC HEATERS

Step 6 — Rig and Place Unit . . . . . . . . . . . . . . . . . . 24

• POSITIONING ON CURB

Step 7 — Horizontal Duct Connection . . . . . . . . . . 25

Step 8 — Install Outside Air Hood 

(Factory Option) . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Step 9 — Assemble Barometric Hood . . . . . . . . . . 26

• BAROMETRIC HOOD (VERTICAL CONFIGURATION)

• BAROMETRIC HOOD (HORIZONTAL

CONFIGURATION)

Step 10 — Install External Condensate Trap and

Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Step 11 — Make Electrical Connections . . . . . . . . . 28

• FIELD POWER SUPPLY

• UNITS WITHOUT FACTORY-INSTALLED

NON-FUSED DISCONNECT OR HACR

• UNITS WITH FACTORY-INSTALLED NON-FUSED

DISCONNECT OR HACR

• ALL UNITS

• CONVENIENCE OUTLETS

• FACTORY-OPTION THRU-BASE CONNECTIONS 

(ELECTRICAL CONNECTIONS)

• ELECTRIC HEATERS

Humidi-MiZer

Control Connections . . . . . . . . . . . . 34

• HUMIDI-MIZER – SPACE RH CONTROLLER

Typical Unit Wiring Diagrams . . . . . . . . . . . . . . . . . 34

Humidi-MiZer Dehumidification System 

(Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

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

Catalog No. 04-53500403-01

Installation Instructions

Page

Printed in U.S.A.

Form No. 50GC-17-28-02SI Rev. B

WeatherMaker

Single Package Rooftop Cooling Only

with Puron

and EcoBlue™ Fan Technology

• NORMAL COOLING

• DEHUM/MECH COOLING (SUBCOOLING) MODE

• DEHUMIDIFICATION (HOT GAS REHEAT) MODE

• REHEAT CONTROL

EconomizerONE (Factory Option) . . . . . . . . . . . . . .44

• ECONOMIZER SETTINGS

• WIRING

• SETUP AND CONFIGURATION

• INSTALLING OPTIONAL HH57LW001 SINGLE

OUTSIDE AIR ENTHALPY SENSOR

• CHECKOUT

• TROUBLESHOOTING

SystemVu™ Controller (Factory Option) . . . . . . . . .65

Smoke Detectors . . . . . . . . . . . . . . . . . . . . . . . . . . . .65

• ADDITIONAL APPLICATION DATA

EconomizerONE Occupancy Switch . . . . . . . . . . . .65

Step 12 — Install Accessories . . . . . . . . . . . . . . . . .65

Step 13 — Fan Speed Set Up . . . . . . . . . . . . . . . . . .65

• UNITS WITH ELECTRO-MECHANICAL 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

injury or product and property damage. NOTE is used to highlight

suggestions which will result in enhanced installation, reliability,

or operation.

Pg 1

50GC-*17-28

(R-410A) Refrigerant

3-24

Replaces: 50GC-17-28-01SI

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Summary of Contents for Carrier WeatherMaker 50GC-17 Series

Page 1 ® WeatherMaker 50GC-*17-28 Single Package Rooftop Cooling Only with Puron ® (R-410A) Refrigerant and EcoBlue™ Fan Technology Installation Instructions • NORMAL COOLING CONTENTS • DEHUM/MECH COOLING (SUBCOOLING) MODE Page • DEHUMIDIFICATION (HOT GAS REHEAT) MODE • REHEAT CONTROL SAFETY CONSIDERATIONS ....1 GENERAL .
Page 2 DANGER CAUTION ELECTRICAL SHOCK HAZARD PERSONAL INJURY HAZARD Failure to follow this warning will result in personal injury or Failure to follow this caution may result in personal injury. death. Sheet metal parts may have sharp edges or burrs. Use care and Before performing service or maintenance operations on unit, wear appropriate protective clothing, safety glasses and gloves turn off main power switch to unit and install lock(s) and...
Page 3 Position: 9 10 11 12 13 14 15 16 17 18 Example: Unit Type Packaging Compliance 50 — Cooling with Optional Electric Heat 0 = Standard ® Model Series - WeatherMaker Electrical Options GC — High Efficiency Packaged RTU A = None with EcoBlue™...
Page 4 Fig. 2 — 50GC-*17 Vertical Airflow...
Page 5 Fig. 3 — 50GC-*17 Horizontal Airflow...
Page 6 Fig. 4 — 50GC-*17 Back View and Condensate Drain Location...
Page 7 Fig. 5 — 50GC-*17 Corner Weights and Clearances...
Page 8 Fig. 6 — 50GC-*17 Bottom View...
Page 9 Fig. 7 — 50GC-*20, 24 Vertical Airflow...
Page 10 Fig. 8 — 50GC-*20, 24 Horizontal Airflow...
Page 11 Fig. 9 — 50GC-*20, 24 Back View and Condensate Drain Location...
Page 12 Fig. 10 — 50GC-*20, 24 Corner Weights and Clearances...
Page 13 Fig. 11 — 50GC-*20, 24 Bottom View...
Page 14 Fig. 12 — 50GC-*28 Vertical Airflow...
Page 15 Fig. 13 — 50GC-*28 Horizontal Airflow...
Page 16 Fig. 14 — 50GC-*28 Back View and Condensate Drain Location...
Page 17 Fig. 15 — 50GC-*28 Corner Weights and Clearances...
Page 18 Fig. 16 — 50GC-*28 Bottom View...
Page 19 CURB-MOUNTED INSTALLATION INSTALLATION Install curb Job-Site Survey Install field-fabricated ductwork inside curb Complete the following checks before installation. Install accessory thru-base service connection package Consult local building codes and the NEC (National Elec- (affects curb and unit) (refer to accessory installation instruc- trical Code) ANSI/NFPA 70 for special installation tions for details) requirements.
Page 20 panel, see Fig. 18. See Fig. 2-16 for basepan knockout locations Step 4 — Provide Unit Support for location. Attach the service connections to the basepan. ROOF CURB MOUNT Accessory roof curb details and dimensions are shown in Fig. 19-21. Assemble and install accessory roof curb in accor- Hood Carton Location Control Box dance with instructions shipped with the curb.
Page 21 Fig. 19 — Roof Curb Details — Size 17 Units...
Page 22 Fig. 20 — Roof Curb Details — Size 20 and 24 Units...
Page 23 Fig. 21 — Roof Curb Details — Size 28 Units...
Page 24 Step 5 — Field Fabricate Ductwork Cabinet return-air static pressure (a negative condition) shall not WARNING exceed 0.5 in. wg (87 Pa) with or without economizer. PERSONAL INJURY HAZARD For vertical ducted applications, secure all ducts to roof curb and building structure.
Page 25 POSITIONING ON CURB Position unit on roof curb so that the following clearances are maintained: 1/4 in. (6 mm) clearance between the roof curb and Hood Top the base rail inside the right and left, 1/2 in. (12 mm) clearance be- Shipping Position tween the roof curb and the base rail inside the front and back.
Page 26 12. Install outdoor air screens by sliding them into each of the Step 9 — Assemble Barometric Hood four spaces created by the hood, filter support and central The barometric hood can be assembled in vertical or horizontal retainers. To do so, first insert the air screens into pocket cre- configuration.
Page 27 NOTE: This panel is not used for horizontal return applications. Remove the screen from the provided panel and install it over the relief opening cut in return duct. Using the blade brackets, install the relief damper onto the side of the return duct (see Fig. 35). The two brackets and relief damper are provided with the economizer.
Page 28 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 accord- ing to required operation of the convenience outlet. If an always- energized convenience outlet operation is desired, connect the source leads to the line side of the unit-mounted disconnect.
Page 29 within sight of the unit per national or local codes. Do not cover To field install the HACR shaft and handle: unit informative plate if mounting the disconnect on the unit Open the control box panel. cabinet. Make sure the HACR shipped from the factory is at OFF UNITS WITH FACTORY-INSTALLED...
Page 30 Failure to follow this caution may result in equipment damage. Operation on improper line voltage or excessive phase imbalance constitutes abuse and may cause damage to electrical components. Such operation would invalidate any Disconnect applicable Carrier warranty. per NEC CONVENIENCE OUTLETS Ground (GR)
Page 31 mit service tool cords to exit the cover. Check for full closing and latching. GFCI Receptacle Cover — While-In-Use Not Included Weatherproof Gasket Baseplate For GFCI Receptacle Fig. 45 — Weatherproof Cover Installation Non unit-powered type Requires the field installation of a general-purpose 125-v 15-A circuit powered from a source elsewhere in the building.
Page 32 This device can be a thermostat (field-supplied) or a SystemVu™ 75 ft (23 m), use no. 14 AWG insulated wire (35°C minimum). All controller (available as factory-installed option for use on a Carrier wire sizes larger than no. 18 AWG cannot be directly connected to Comfort Network ®...
Page 33 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 Electric Heater Tracks from the 230-v connection and moving it to the 208-v 1/4 in. male terminal on the primary side of the transformer. Refer to unit label diagram for additional information.
Page 34 RH above control setpoint, see Fig. 54) or a com- HUM terminal on the UCB (Unit Control Board). Connect bination thermostat-humidistat control device such as Carrier’s the other lead to the R terminal on the UCB. See Fig. 56.
Page 35 Programmable Thermostat Unit Control Board Thermostat Connections O/W2/B S RTN Fig. 57 — 50GC-*17-28 Unit with Humidi-MiZer Adaptive Dehumidification System with Edge ® Pro Thermidistat Device...
Page 36 Fig. 58 — Typical 50GC-*17-28 Control Wiring Diagram, Electro-Mechanical with POL224 Controller...
Page 37 Fig. 59 — Typical 50GC-*20-24 Power Wiring Diagram, Electro-Mechanical Controller...
Page 38 Fig. 60 — Typical 50GC-*28 Power Wiring Diagram, Electro-Mechanical Controller...
Page 39 Fig. 61 — Typical 50GC-*17-28 Control Wiring Diagram, SystemVu™ Controller...
Page 40 Fig. 62 — Typical 50GC-*17-24 Power Wiring Diagram, SystemVu™ Controller...
Page 41 Fig. 63 — Typical 50GC-*28 Power Wiring Diagram, SystemVu™ Controller...
Page 42 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 43 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. 65 — Subcooling Mode – Humidi-MiZer System for 50GC 17-28 Indoor Supply Valve 3-Way...
Page 44 LED Indication EconomizerONE (Factory Option) NOTE: If different faulty events occur at the same time, the ECONOMIZER SETTINGS sensor/DAC LED lights up following this priority: Red  Interface Overview Yellow  Off. For example, if there is a humidity sensor error and air temperature failure at the same time, the sensor LED EconomizerONE turns red rather than yellow.
Page 45 Table 4 — 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 46 Table 5 — 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 set point. • Fixed Dry Bulb If the outside air dry bulb temperature is below the temperature shutoff set MA (Mixed Air) temperature sensor point, then the outside air is used to meet all or part of the cooling demand.
Page 47 Table 6 — 1 and 2-Stage Cooling Stage I/O Logic Table 9 — 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 48 Table 11 — Different Damper Position Setting 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 49 • If Exhaust Fan 2 is connected and configured, then Fault Detection and Diagnostics Exhaust Fan 2 parameter group (L, M, and H) is available, The economizer controller can detect and diagnose free cool- depending on fan configuration. ing faults, sensor operation faults, and damper modulating •...
Page 50 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, hu- midity sensor, combination temperature and humidity sensor, CO...
Page 51 Table 13 — Economizer 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 52 Connecting Peripheral Devices to the Economizer Controller See Fig. 74-78 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 53 • 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 54 SETUP AND CONFIGURATION NOTE: Parameters and display menus may display differently/ dynamically if different applications are configured. See Tables 14-21. IMPORTANT: Before setup and configuration, it is recom- mended to obtain some location-based values, such as shutoff points, or utilize the location services in the Climatix ™...
Page 55 Table 14 — Status Display PARAMETER DESCRIPTION VALUE 1FREECOOL Indicates if the system can use outdoor air for free cooling. 1ECON ENAB Indicates if outdoor air is being used for the first stage of cooling. Indicates if the space is occupied. If users choose ALWAYS for 6OCC when configuring I/ Os, the parameter value is YES;...
Page 56 Table 15 — Parameter Settings — Basic PARAMETER DESCRIPTION RANGE DEFAULT Temperature shutoff set point can be obtained automatically if a smartphone or tablet is connected to the network provided by a Wi-Fi/WLAN stick 2 TEMP OFF plugged into the Economizer Controller and the mobile application is 48...80°F;...
Page 57 Table 16 — 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 58 Table 17 — Parameter Settings — I/O Configurations (cont) PARAMETER DESCRIPTION VALUE DEFAULT Choose ACT FB if feedback signal is available from the connected damper ACT FB 6AUX-AI2 ACT FB actuator. Otherwise, choose NONE. NONE Choose “COOL 2” if Cooling Stage 2 is available (another compressor is COOL 2 6Y2O COOL 2...
Page 59 Table 20 — 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 60 Fig. 79 — HH57LW001 Dimensional, Connection and Switching Information Fig. 80 — HH79NZ039 Dry Bulb and Mixed Air Sensor Wiring Economizer Actuator Outside Air (This End) Damper Wiring Harness Return Air Damper Fig. 81 — EconomizerONE System Component Locations Fig. 82 — California Title 24 Zones...
Page 61 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. 83 — U.S. and Canada Climate Zones Table 22 —...
Page 62 Economizers are shipped standard with an HH79NZ039 outside Table 23 — California Title 24 Regional High Limit air dry bulb sensor (refer to Fig. 80). System default setting (high Dry Bulb Temperature Settings temp 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 63 CHECKOUT NOTE: All settings are stored in non-volatile flash memory. Status Inspect all wiring connections at the economizer module’s termi- nals, and verify compliance with the installation wiring diagrams. Use the Status menu (refer to Table 14) to check the parameter For checkout, review the Status of each configured parameter and values for the various devices and sensors configured.
Page 64 TROUBLESHOOTING For EconomizerONE troubleshooting issues, see Table 25. Table 25 — 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 65 Units with two fan motors are wired to connect the motor protec- SystemVu™ Controller (Factory Option) tion relays in series. If one motor detects a problem, both motors For details on operating 50GC-*17-28 units equipped with the shut down and unit operation is disabled. factory-installed SystemVu controller option, refer to the FC/GC Series Single Package Rooftop Units with SystemVu Controller UNITS WITH ELECTRO-MECHANICAL CONTROLS...
Page 66 ESP in. wg Factory Setting: Calculator 9.0 V 6000 Field Setting: 6500 Record field setting here 7000 7500 8000 Switch Range: 8500 9000 4.1 - 7.5 9500 10.0 6.9 - 8.7 10000 7.7 - 10.0 Field Accessories: Economizer * Overlap in A, B, C switch range designed for maximum field adjustment potential.
Page 67 ESP in. wg Calculator 1250 1348 1441 1528 1610 1688 1762 1832 1899 1963 6000 1336 1428 1515 1598 1677 1753 1824 1893 1959 2021 6500 1423 1509 1591 1670 1746 1819 1888 1955 2020 2081 7000 1510 1591 1669 1744 1817 1887...
Page 70 © 2024 Carrier Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53500403-01 Printed in U.S.A. Form No. 50GC-17-28-02SI Rev. B Pg 70 3-24 Replaces: 50GC-17-28-01SI...
Page 71 START-UP CHECKLIST FOR 50GC**17-28 SINGLE PACKAGE ROOFTOP ELECTRIC COOLING UNITS (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 Installation Instruction document.
Page 72 (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. 04-53500403-01 Printed in U.S.A.

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