Carrier 50GS, 50GX HIGH-VOLTAGE Connections, Control Voltage Connections, Standard Connection

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DUCT COVERS REMOVED

C99012

Fig. 9—Vertical Duct Cover Removed

Failure to follow these precautions could result in damage to the unit being installed:

1.Make all electrical connections in accordance with NEC ANSI/NFPA (latest edition) and local electrical codes governing such wiring. In Canada, all electrical connec- tions must be in accordance with CSA standard C22.1 Canadian Electrical Code Part 1 and applicable local codes. Refer to unit wiring diagram.

2.Use only copper conductor for connections between field-supplied electrical disconnect switch and unit. DO NOT USE ALUMINUM WIRE.

3.Be sure that high-voltage power to unit is within operating voltage range indicated on unit rating plate.

4.Do not damage internal components when drilling through any panel to mount electrical hardware, conduit, etc. On 3-phase units, ensure phases are balanced within 2 percent. Consult local power company for correction of improper voltage and/or phase imbalance.

HIGH-VOLTAGE CONNECTIONS

The unit must have a separate electrical service with a field- supplied, waterproof, disconnect switch mounted at, or within sight from, the unit. Refer to the unit rating plate for maximum fuse/circuit breaker size and minimum circuit amps (ampacity) for wire sizing. See Tables 4 and 5 for electrical data.

The field-supplied disconnect switch box may be mounted on the unit over the high-voltage inlet hole when the standard power and low-voltage entry points are used. See Fig. 2 & 3 for acceptable location.

See unit wiring label and Fig. 10 for reference when making high voltage connections. Proceed as follows to complete the high- voltage connections to the unit.

Single phase units:

1.Run the high-voltage (L1, L2) and ground leads into the control box.

2.Connect ground lead to chassis ground connection.

3.Connect L1 to pressure lug connection 11 of the compressor contactor.

4.Connect L2 to pressure lug connection 23 of the compressor contactor.

Three phase units:

1.Run the high-voltage (L1, L2, L3) and ground leads into the control box.

2.Connect ground lead to chassis ground connection.

3.Locate the black and yellow wires connected to the lines side of the contactor.

4.Connect field L1 to black wire on connection 11 of the compressor contactor.

5.Connect field wire L2 to yellow wire on connection 13 of the compressor contactor.

6.Connect field wire L3 to Blue wire from compressor.

SPECIAL PROCEDURES FOR 208-V OPERATION

Make sure that the power supply to the unit is switched OFF and lockout tag installed before making any wiring changes. Electrical shock can cause serious injury or death.

CONTROL VOLTAGE CONNECTIONS

HIGH VOLTAGE

 

POWER LEADS

POWER

(SEE UNIT WIRING

SUPPLY

LABEL)

 

 

 

FIELD-SUPPLIED

 

 

GND

FUSED DISCONNECT

 

 

 

 

CONTROL BOX

 

 

 

 

 

 

YEL(Y)

Y

 

 

 

GRN(G)

THERMOSTAT

 

 

 

LOW-VOLTAGE

 

G

(TYPICAL)

 

RED(R)

POWER LEADS

 

R

 

(SEE UNIT

 

 

 

 

BRN(C)

 

 

WIRING LABEL)

 

C

 

 

 

 

 

 

SPLICE BOX

 

 

 

LEGEND

Field Control-Voltage Wiring

Field High-Voltage Wiring

NOTE: Use blue wire for 3-phase units only.

C99010

Fig. 10—High- and Control-Voltage Connections

NOTE: Do not use any type of power-stealing thermostat. Unit control problems may result.

Use no. 18 American Wire Gage (AWG) color-coded, insulated (35 C minimum) wires to make the control voltage connections between the thermostat and the unit. If the thermostat is located more than 100 ft. from the unit (as measured along the control voltage wires), use no. 16 AWG color-coded, insulated (35 C minimum) wires.

STANDARD CONNECTION

Remove knockout hole located in the electric heat panel adjacent to the control access panel. See Fig. 2 & 3. Remove the rubber grommet from the installer’s packet (included with unit) and install grommet in the knockout opening. Provide a drip loop before running wire through panel.

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Contents Table of Contents Safety ConsiderationsIntroduction 50GS018-042 and 50GX024-036 Unit Dimensions Installation Inspection50GS048-060 and 50GX042-060 Unit Dimensions Roof Curb Dimensions 50GS and 50GX Unit Corner Weights Suggested Rigging Physical Data-Unit 50GS Configuring Units for Downflow Vertical DIS- ChargePhysical Data-Unit 50GX Supply and Return Duct Opening Control Voltage Connections HIGH-VOLTAGE ConnectionsStandard Connection Electrical Data-50GS MocpElectrical Data-50GX MCA MocpTransformer Protection PRE-START-UPSTART-UP Start UP Cooling Section and Make ADJUST- MentsChecking and Adjusting Refrigerant Charge Checking Cooling Control OperationWiring Diagram 208/230-60-1 Wiring Diagram 208/230-60-3 Wiring Diagram Color Coding for 208/230-V Motor Leads Indoor Airflow and Airflow AdjustmentsMaintenance Color Coding for 460-V GE Motor Leads460 Volt Unit Watts 281 282 278 276 Cfm 833 776 702 638 554 Cooling Charging Chart, 50GS018 Units Cooling Charging Chart, 50GS042 Units Evaporator Blower and MotorCooling Charging Chart, 50GX030 Units Condenser FAN Condenser COIL, Evaporator COIL, and CONDEN- Sate Drain PANRefrigerant Circuit Evaporator Airflow TroubleshootingSTART-UP Checklist Liquid Line StrainerTroubleshooting-Cooling Symptom Cause RemedySTART-UP Checklist Remove and Store in JOB File Book Catalog No Form 50GS,GX-4SI Replaces 50GS,GX-3SI Tab

50GX, 50GS specifications

Carrier has long been a leader in the HVAC industry, and its latest offerings, the 50GX and 50GS series, continue this tradition. These units stand out for their robust design, advanced technology, and energy-efficient operation, making them ideal choices for commercial and light industrial applications.

The Carrier 50GX is a packaged rooftop unit known for its innovative features aimed at enhancing energy efficiency while ensuring optimal indoor air quality. It employs a variable-speed compressor, which allows for precise temperature control and reduced energy consumption. The 50GX is equipped with microprocessor controls that optimize performance and simplify maintenance, offering real-time diagnostics and monitoring.

One of the standout technologies in the 50GX is its use of R-410A refrigerant, a greener alternative that reduces environmental impact without compromising cooling performance. This refrigerant is designed to deliver superior cooling efficiency while meeting strict environmental regulations. Additionally, the system features an integrated economizer, which takes advantage of outside air to improve energy efficiency during cooler months, reducing reliance on mechanical cooling.

The 50GS series, while similar in many respects to the 50GX, is tailored for applications requiring heating solutions. These units offer gas heat as an option, providing flexibility for varying climate conditions. The 50GS also incorporates an advanced heat exchanger design that maximizes heat transfer efficiency and reduces operational costs.

Both the 50GX and 50GS units are built with durability in mind. They feature a galvanized steel cabinet with a powder-coated finish, providing resistance to rust and corrosion. The robust construction ensures a long lifespan even in challenging environments.

Maintenance is made easier with these models, thanks to their accessible design that allows for quick servicing. Both the 50GX and 50GS units come with a host of customizable options, including different airflow configurations and additional filtration systems to enhance air quality.

In conclusion, the Carrier 50GX and 50GS series represent the pinnacle of HVAC technology with their focus on energy efficiency, environmental sustainability, and robust construction. These units are ideal for customers looking to invest in reliable and efficient climate control solutions for their facilities, combining advanced technology with time-tested engineering.