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Carrier 50gs sizes 018-060 Installation Start-Up And Operatig Instructions

Single package electric cooling unit
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Installation, Start-Up, and Operating Instructions
50GS Sizes 018-060, 50GX Sizes 024-060
NOTE: Read the entire instruction manual before starting the
installation.
This symbol → indicates a change since the last issue.

TABLE OF CONTENTS

SAFETY CONSIDERATIONS .....................................................1
Introduction ....................................................................................2
RECEIVING AND INSTALLATION ..........................................2
Check Equipment......................................................................2
IDENTIFY UNIT ................................................................2
INSPECT SHIPMENT ........................................................2
Provide Unit Support ................................................................2
ROOF CURB.......................................................................2
SLAB MOUNT ...................................................................2
GROUND MOUNT ............................................................2
Provide Clearances....................................................................2
Field Fabricate Ductwork .........................................................2
Rig and Place Unit....................................................................2
INSPECTION ......................................................................3
INSTALLATION ................................................................3
Connect Condensate Drain .......................................................5
Install Duct Connections ..........................................................6
CAL) DISCHARGE ............................................................7
Install Electrical Connection ....................................................9
HIGH-VOLTAGE CONNECTIONS..................................9
CONTROL VOLTAGE CONNECTIONS.......................10
STANDARD CONNECTION ..........................................10
TRANSFORMER PROTECTION....................................10
PRE-START-UP ..........................................................................10
START-UP ...................................................................................13
CHECK FOR REFRIGERANT LEAKS..........................13
MENTS ..............................................................................13
CHARGE ...........................................................................14
MENTS ..............................................................................14
For 208/230V.....................................................................14
FOR 460-V GE MOTORS................................................14
COOLING SEQUENCE OF OPERATION.....................16
MAINTENANCE.........................................................................18
AIR FILTER......................................................................22
EVAPORATOR BLOWER AND MOTOR.....................22
DENSATE DRAIN PAN ..................................................23
CONDENSER FAN ..........................................................23
ELECTRICAL CONTROLS AND WIRING ..................24
REFRIGERANT CIRCUIT...............................................24
EVAPORATOR AIRFLOW .............................................24
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 6
PC 101
Catalog No. 535-00078
Tab 6
8
Single Packaged Electric Cooling Units
Printed in U.S.A.
LIQUID LINE STRAINER ..............................................24
Troubleshooting............................................................................24
Start-Up Checklist ........................................................................24
NOTE TO INSTALLER - Before the installation, READ THESE
INSTRUCTIONS CAREFULLY AND COMPLETELY. Also,
make sure the User's Manual and Replacement Guide are left with
the unit after installation.

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can be
hazardous due to system pressure and electrical components. Only
trained and qualified personnel should install, repair, or service
air-conditioning equipment.
Untrained personnel can perform basic maintenance functions of
cleaning coils and 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. Consult a qualified installer or
service agency for information or assistance. The qualified in-
staller or agency must use only factory-authorized kits or acces-
sories when modifying this product.
Fig. 1-Unit 50GS and 50GX
Form 50GS,GX-3SI
Pg 1
50GS, 50GX
C99001
11-02
Replaces: 50GS,GX-2SI

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Summary of Contents for Carrier 50gs sizes 018-060

  • Page 1: Table Of Contents

    50GS, 50GX Single Packaged Electric Cooling Units Visit www.carrier.com Installation, Start-Up, and Operating Instructions 50GS Sizes 018-060, 50GX Sizes 024-060 NOTE: Read the entire instruction manual before starting the METERING DEVICE — ACUTROL DEVICE .....24 installation. LIQUID LINE STRAINER ..........24 This symbol →...

  • Page 2: Introduction

    Check all items against shipping list. Immediately notify the reasons due to the installation location (roofs, elevated structures, nearest Carrier Air Conditioning office if any item is missing. To etc.) prevent loss or damage, leave all parts in original packages until Only trained, qualified crane operators and ground support staff installation.

  • Page 3: Inspection

    REQUIRED CLEARANCE TO COMBUSTIBLE MATL. REQUIRED CLEARANCE FOR OPERATION AND SERVICING INCHES [mm] INCHES [mm] TOP OF UNIT...................14.00 [355.6] EVAP. COIL ACCESS SIDE............36.00 [914.0] DUCT SIDE OF UNIT.................2.00 [50.8] POWER ENTRY SIDE..............42.00 [1066.8] SIDE OPPOSITE DUCTS ..............14.00 [355.6] (EXCEPT FOR NEC REQUIREMENTS) BOTTOM OF UNIT ................0.50 [12.7] UNIT TOP ..................48.00 [1219.2] SIDE OPPOSITE DUCTS ..............36.00 [914.0]...
  • Page 4 REQUIRED CLEARANCE FOR OPERATION AND SERVICING REQUIRED CLEARANCE TO COMBUSTIBLE MATL. INCHES [mm] INCHES [mm] TOP OF UNIT...................14.00 [355.6] EVAP. COIL ACCESS SIDE............36.00 [914.0] DUCT SIDE OF UNIT.................2.00 [50.8] POWER ENTRY SIDE..............36.00 [914.0] SIDE OPPOSITE DUCTS ..............14.00 [355.6] (EXCEPT FOR NEC REQUIREMENTS) UNIT TOP ..................48.00 [1219.2] BOTTOM OF UNIT ................0.50 [12.7] ELECTRIC HEAT PANEL ..............36.00 [914.4]...

  • Page 5: Connect Condensate Drain

    HVAC unit HVAC unit base base Gasketing inner flange* Screw Screw Gasketing (NOTE A) inner flange* (NOTE A) *Gasketing *Gasketing outer flange outer flange Wood nailer* Wood nailer* Flashing field Flashing field supplied supplied Roofcurb* Roofcurb* Insulation (field Insulation (field supplied) supplied) Roofing material...

  • Page 6: Install Duct Connections

    C00071 50GS 50GX CORNER # TOTAL WEIGHT Fig. 4B—50GS and 50GX Unit Corner Weights MAXIMUM ALLOWABLE DIFFERENCE (in.) C99065 Fig. 5A—Unit Leveling Tolerances OPTIONAL OPTIONAL RETURN SUPPLY OPENING OPENING 2" EVAP. COIL COND. COIL C99096 Fig. 5B—Slab Mounting Detail slope of at least 1-in. for every 10 ft. of horizontal run. Be sure to Step 7—Install Duct Connections check the drain tube for leaks.

  • Page 7: Configuring Units For Downflow (Verti- Cal) Discharge

    914-137" (36"-54") “A” “B” DETAIL A SCALE 0.250 TIGHTEN STRAPPING SECURELY WITH TENSION BUCKLE INSTALL SAFETY STRAPS TO RIGGING CLEVIS AT 4 RIGGING BRACKETS PLACE RIGGING BRACKET ASSEMBLY IN 4 RIGGING HOLES AND INSTALL TIE DOWN STRAP AROUND PERIMETER OF UNIT AND THROUGH SPACE IN BRACKET ASSEMBLY SEE DETAIL A C99066...
  • Page 8 Table 1—Physical Data—Unit 50GS UNIT SIZE NOMINAL CAPACITY (ton) 1-1/2 2-1/2 3-1/2 OPERATING WEIGHT (lb.) COMPRESSOR Reciprocating Scroll Reciprocating REFRIGERANT (R-22) 3.65 Quantity (lb.) Accurater REFRIGERANT METERING DEVICE Orifice ID (in.) .034 .034 .034 .032 .034 .032 .030 CONDENSER COIL 1...17 1...17 1...17...

  • Page 9: Install Electrical Connection

    1” (25mm) MIN. TRAP OUTLET 2” (50mm) MIN. C99013 Fig. 7—Condensate Trap Table 3—Minimum Airflow for Safe Electric Heater Operation (Cfm) SIZE 1000 1200 1400 1600 2000 Metal and Air Conditioning Contractors National Association (SMACNA) and Air Conditioning Contractors of America (ACCA) minimum installation standards for heating and air conditioning systems.

  • Page 10: Special Procedures For 208-V Operation

    sight from, the unit. Refer to the unit rating plate for maximum box. Route leads through hole in bottom of control box and make fuse/circuit breaker size and minimum circuit amps (ampacity) for low-voltage connections (See Fig. 10). Secure all cut wires, so that wire sizing.
  • Page 11 Table 4—Electrical Data—50GS VOLTAGE COMPRESSOR ELECTRIC HEAT POWER SUPPLY UNIT 50GS RANGE V-PH-HZ SIZE Nominal Kw* Max Fuse orCkt Bkr MOCP 13.9/13.9 20/20 — 3.8/5.0 18.1/20.8 24.8/28.3 25/30 — 208/230–1–60 0.80 5.4/7.2 26.0/30.0 34.7/39.8 35/40 — 7.5/10.0 36.1/41.7 47.4/54.3 50/60 —...
  • Page 12 Table 5—Electrical Data—50GX VOLTAGE COMPRESSOR ELECTRIC HEAT POWER SUPPLY RANGE UNIT 50GX V-PH-HZ Max Fuse SIZE Nominal Kw MOCP Ckt Bkr 16.5/16.5 20/20 — 3.8/5.0 18.1/20.8 25.1/28.5 30/30 — 208/230–1–60 10.9 54.0 5.4/7.2 26.0/30.0 35.0/40.0 35/40 — 7.5/10.0 36.1/41.7 47.6/54.6 50/60 —...

  • Page 13: Start-Up

    EXAMPLE: Supply voltage is 460-3-60. AB = 452 v LEGEND BC = 464 v AC = 455 v — Full Load Amps — Locked Rotor Amps 452 + 464 + 455 ® Average Voltage = — Minimum Circuit Amps MOCP — Maximum Overcurrent Protection 1371 —...

  • Page 14: Checking And Adjusting Refrigerant Charge

    Observe that compressor, condenser fan, and evaporator 6. Compare actual suction-tube temperature with desired blower motors start. Observe that compressor and outdoor fan suction-tube temperature. Using a tolerance of ±3°F, add shut down when control setting is satisfied and that indoor refrigerant if actual temperature is more than 3°F higher than blower shuts down after 30 second fan time delay expires.
  • Page 15 C99003 Fig. 12—Wiring Diagram (208/230-60-1) black must be connected to the jumper wire. Insulate removed lead from the jumper lead male quick connect (QC) and connect the end to avoid contact with chassis parts. To select high speed on black lead to the BR. Insulate the jumper to avoid contact with any 460-v GE motors, separate the black female quick connect (QC) chassis parts.

  • Page 16: Cooling Sequence Of Operation

    C99004 Fig. 13—Wiring Diagram (208/230-60-3) COOLING SEQUENCE OF OPERATION When the room temperature rises to a point that is slightly above the cooling control setting of the thermostat, the thermostat With the room thermostat SYSTEM switch in the COOL position completes the circuit between thermostat terminal R to terminals Y and the FAN switch in the AUTO position, the cooling sequence and G.
  • Page 17 C99005 Fig. 14—Wiring Diagram (460-60-3) contactor coil (C) (through unit wire Y) and time delay relay The normally open contacts of energized contactor (C) close and (TDR) (through unit wire G) across the 24-v secondary of complete the circuit through compressor motor (COMP) to con- transformer (TRAN).

  • Page 18: Maintenance

    C99037 C99039 Fig. 15—Cooling Charging Chart, 50GS018 Units Fig. 16—Cooling Charging Chart, 50GS024 Units C99038 C99040 Fig. 17—Cooling Charging Chart, 50GS030 Units Fig. 18—Cooling Charging Chart, 50GS036 Units The set of normally open contacts of energized relay TDR close MAINTENANCE and complete the circuit through evaporator blower (indoor) fan To ensure continuing high performance, and to minimize the motor (IFM).
  • Page 19 Table 8—Wet Coil Air Delivery (Deduct 10 percent for 208v)* Horizontal and Downflow Discharge Unit 50GS018-060 230 AND 460 VOLT External Static Pressure (in. wg) Motor Unit Speed Watts 1000 Watts Watts High 1150 1032 Watts Watts 1136 1085 1010 Watts High 1415...
  • Page 20 Table 9—Wet Coil Air Delivery (Deduct 10 percent for 208v)* Horizontal and Downflow Discharge Unit 50GX024-060 230 AND 460 VOLT External Static Pressure (in. wg) Motor Unit Speed Watts Watts Watts High Watts Watts 1148 1104 1028 Watts High 1102 Watts 1352 1257...
  • Page 21 OUTDOOR TEMP ° F ° C ° C99041 C99042 Fig. 19—Cooling Charging Chart, 50GS042 Units Fig. 20—Cooling Charging Chart, 50GS048 Units (024) 60HZ CHARGING CHART OUTDOOR TEMP OUTDOOR TEMP ° F ° C ° F ° C ° ° C99043 C99044 Fig.

  • Page 22: Air Filter

    (030) 60HZ CHARGING CHART (036) 60HZ CHARGING CHART OUTDOOR TEMP ° F ° C OUTDOOR TEMP ° F ° C ° ° C99046 C99045 Fig. 23—Cooling Charging Chart, 50GX030 Units Fig. 24—Cooling Charging Chart, 50GX036 Units (042) 60HZ CHARGING CHART (048) 60HZ CHARGING CHART OUTDOOR TEMP OUTDOOR TEMP...

  • Page 23: Condenser Coil, Evaporator Coil, And Con- Densate Drain Pan

    (060) 60HZ CHARGING CHART OUTDOOR TEMP ° F ° C ° C99049 Fig. 27—Cooling Charging Chart, 50GX060 Units c. On all units remove blower assembly from unit. Remove attachment. Be careful not to bend the fins. If coated with oil or screws securing blower to blower partition and slide grease, clean the coils with a mild detergent-and-water solution.

  • Page 24: Electrical Controls And Wiring

    ELECTRICAL CONTROLS AND WIRING If no refrigerant leaks are found and low cooling performance is suspected, refer to Checking and Adjusting Refrigerant Charge Inspect and check the electrical controls and wiring annually. Be section. sure to turn off the electrical power to the unit and install lockout tag.
  • Page 25 Table 10—Troubleshooting—Cooling SYMPTOM CAUSE REMEDY Power Failure Call power company Fuse blown or circuit breaker tripped Replace fuse or reset circuit breaker Defective thermostat, contractor, transformer, or Replace component control relay Compressor and condenser fan will not start. Insufficient line voltage Determine cause and correct Incorrect or faulty wiring Check wiring diagram and rewire correctly...
  • Page 26 START-UP CHECKLIST (REMOVE AND STORE IN JOB FILE) I. PRELIMINARY INFORMATION Model No ................................Serial No ................................Date ..................................Technician ................................Job/ Location............................... II. PRE-START-UP ____ Verify that all packing materials have been removed from unit ____ Verify that condensate connection is installed per installation instructions ____ Check all electrical connections and terminals for tightness ____ Check that indoor (evaporator) air filter is clean and in place ____ Verify that unit installation is level...
  • Page 28 Form No. 50GS,GX-3SI Cancels: 50GS,GX-2SI Page 28 11/02 Copyright 2002 Carrier Corp. Catalog No. 535-00078...

This manual is also suitable for:

50gx sizes 024-060

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