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HEATING & COOLING

48GS, 48GX

3-Phase Single-Packaged Gas Heating/

Electric Cooling Units

Visit www.carrier.com

Installation, Start-Up, and Operating Instructions

48GS Sizes 030-060, 48GX Sizes 030-060

NOTE: Read the entire instruction manual before starting the

installation.

TABLE OF CONTENTS

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

INTRODUCTION .......................................................................... 2

RECEIVING AND INSTALLATION .......................................... 2

CHECK EQUIPMENT ............................................................. 2

IDENTIFY UNIT ................................................................ 2

INSPECT SHIPMENT ........................................................ 2

INSTALLATION ................................................................ 2

PROVIDE uNrr SUPPORT .................................................... 2

ROOF CURB ....................................................................... 2

SLAB MOUNT ................................................................... 2

GROUND MOUNT ............................................................ 6

FIELD FABRICATE DUCTWORK ........................................ 6

PROVIDE CLEARANCES ...................................................... 7

RIG AND PLACE UNIT ......................................................... 7

CONNECT CONDENSATE DRAIN ...................................... 7

INSTALL FLUE HOOD .......................................................... 8

INSTALL GAS PIPING ........................................................... 8

INSTALL DUCT CONNECTIONS ...................................... 10

CONFIGURING UNITS FOR DOWNFLOW (VERTI-

CAL) DISCHARGE .......................................................... 10

INSTALL ELECTRICAL CONNECTIONS ......................... 12

HIGH-VOLTAGE CONNECTIONS ................................ 12

SPECIAL PROCEDURES FOR 208-V OPERATION ...12

CONTROL VOLTAGE CONNECTIONS ....................... 12

HEAT ANTICIPATOR SETTING ................................... 12

TRANSFORMER PROTECTION .................................... 15

PRE-START-UP .......................................................................... 15

START-HE ................................................................................... 15

CHECK FOR REFRIGERANT LEAKS ............................... 15

START-UP HEATING AND MAKE ADJUSTMENTS......16

CHECK HEATING CONTROL ....................................... 16

CHECK GAS INPUT ........................................................ 16

ADJUST GAS INPUT ...................................................... 16

CHECK BURNER FLAME .............................................. 19

AIRFLOW AND TEMPERATURE RISE ....................... 19

HEATING SEQUENCE OF OPERATION ..................... 19

LIMIT SWITCHES ........................................................... 19

AUXILIARY LIMIT SWITCH (ROLLOUT) .................. 19

START-UP COOLING AND MAKE ADJUSTMENTS......20

CHECKING COOLING CONTROL OPERATION .......20

CHECKING AND ADJUSTING REFRIGERANT

CHARGE ........................................................................... 20

INDOOR AIRFLOW AND AIRFLOW ADJUST-

MENTS .............................................................................. 21

COOLING SEQUENCE OF OPERATION ..................... 21

MAINTENANCE ......................................................................... 21

AIR FILTER ...................................................................... 24

EVAPORATOR BLOWER AND MOTOR ..................... 24

FLUE GAS PASSAGEWAYS ......................................... 26

A99338

Fig. 1--Unit 48GS and 48GX

COMBUSTION-AIR BLOWER ....................................... 27

LIMIT SWITCH ................................................................ 27

BURNER IGNITION ........................................................ 27

MAIN BURNERS ............................................................. 27

CONDENSER COIL, EVAPORATOR COIL, AND

CONDENSATE DRAIN PAN .......................................... 27

CONDENSER FAN .......................................................... 28

ELECTRICAL CONTROLS AND WIRING .................. 28

REFRIGERANT CIRCUIT ............................................... 28

GAS INPUT ...................................................................... 28

EVAPORATOR AIRFLOW ............................................. 28

METERING DEVICE -- ACUTROL DEVICE ............. 28

LIQUID LINE STRAINER .............................................. 28

TROUBLESHOOTING ............................................................... 28

START-UP CHECKLIST ............................................................ 28

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. The furnace is NOT to be used for

temporary beating of buildings or structures under construction.

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.

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

PC 101 Printed ir_U.S.A. Catalog NO. 48GS,GX-TSI Pg 1 2-06 Replaces: New

1 2 3 4 5 6 ... 31 32

Inhaltsverzeichnis

Seite 1 - Electric Cooling Units

HEATING & COOLING48GS, 48GX3-Phase Single-Packaged Gas Heating/Electric Cooling UnitsVisit www.carrier.comInstallation, Start-Up, and Operating In

Seite 2 - Step I_HECK EQUIPMENT

UNIT SIZE 48GXNOMINAL CAPACITY (ton)OPERATING WEIGHT (lb.)COMPRESSORSQuantityREFRIGERANT (R-22)Quantity (lb.)REFRIGERANT METERING DEVICEOrifice ID (in

Seite 3 - '"11111

INI3"MINIC99020Fig. 9_Sediment Trap2. Remove return duct cover located on duct panel by breakingconnecting tabs with screwdriver and a hammer (Se

Seite 4 - \,,,,, [...r

Step 10--INSTALL ELECTRICAL CONNECTIONSr._l LI"/_-'1,'I I",[_The unit cabinet must have an uninterrupted, unbrokenelectrical groun

Seite 5 - Fig. 4---Roof Curb Dimensions

UNITSIZE46GS030O36042O48O60Table 4--Electrical Data--Unit 48GSV-PH-HZVOLTAGE COMPRESSORRANGEMin Max RLA LRAOUTDOOR FANMOTORINDOOR FANMOTOR POWER SUPPL

Seite 6 - Fig. 6_Slab Mounting Details

Table 5_Electrical Data_nit 48GXUNITSIZE48GX030036042O48O60V-PH-HZVOLTAGERANGECOMPRESSOROUTDOOR FANMOTORFLAINDOOR FANMOTORMin Max RLA LRA288/230_3_0 1

Seite 7 - Step 5--RIG AND PLACE UNIT

TRANSFORMER PROTECTIONThe transformer is of the energy-limiting type. It is set towithstand a 30°sec. overload or shorted secondary condition.PPdE-STA

Seite 8 - I g° I 60

BURNER FLAMEBURNER_IANIFOL DC99021Fig. 14_Monoport BurnerNOTE: Install a f-alterdrier whenever the system has been openedfor repair.3. Add a small cha

Seite 9

FIELDSUPPLYPOWERW4.3 BLKOFM10ONLY)EQUIP GMGCOOLINGFANLOGICrT+30G GENERGIZED DEFNERGIZEDHEAtiNGFANLOGICIIo 45 • T+3OW BR W BRENERGIZED DE B_ERG[ZED%%OF

Seite 10 - I 03 I 83 r 81

F,ELO c IE ,P_QMO--'/// lW45 BLK BLKCAP 2 YELW5 YEL BRNWO BLK L__(060ONLY)% L3- \ N, / coMPW56 BLUCOGUNG FAN LOGIC(SEE NOTE #4)wB,YEL- -W64 YEL C

Seite 11 - Fig. 9_Sediment Trap

Table 6_Heating InputsHEATINGINPUT(BTUH)*NUMBEROFORIFICES40,000 260,000 290,000 3115,000 3130,000 3Min4.04.04.04.04.0GAS SUPPLY PRESSURE(IN. WG)Natura

Seite 12

Untrained personnel can perform basic maintenance functions ofcleaning coils and filters. All other operations should be performedby trained service p

Seite 13

HEATINGINPUT(BTUH)40,00060,00090,000115,000130,000Table 7--Air Delivery (Cfm) at Indicated Temperature Rise and Rated Heating InputTEMPERATURE RISE °F

Seite 14 - Table 5_Legend

determinedesiredsystemoperatingsuctionlinetemperature(SeeFig.17-26).6.Compareactualsuction-tubetemperaturewithdesiredsuction-tubetemperature.Usingatol

Seite 15 - Fig. 12--Fan Blade Clearance

Table 11--Dry Coil Air Delivery* - Horizontal Downflow Discharge -Unit 48GS030-060 (Deduct 10 percent for 208 Volts)230 AND 460 VOLTUnit M_or E_ernalS

Seite 16 - Fig. 14_Monoport Burner

Table 13--Dry Coil Air Delivery* - Horizontal and Downflow Discharge -Unit 48GX030-060 (Deduct 10 percent for 208 Volts)230 AND 466 VOLTUnit Motor E_e

Seite 17 - " [BN

Fig.19---CoolingChargingChad,48GS042U_ °4s÷_ i i i Ii i = i75_ 110 i !68= 100-_v i _' 105 41. 95 :t5m _ 65 18LU _ _ J_'_ L,,,,__ _ o70 _ .TI

Seite 18 - F,ELO c I

2761 40i _71 30(0301 60HZ CHARGING CHARTr_46413529241813740 50 60 70 8_0 90SUCTION LINETEMPERATURE (_F}_1 4 10 16 21 27 32SUCTION LINETEMPERATURE (_C)

Seite 19 - Table 6_Heating Inputs

Table 14_8GS Wet Coil Pressure DropUNIT SIZE AIRFLOW PRESSURE DROP48GS (CFM) (IN. WG)900 0.065030 1000 0.0801100 0.0971100 0.084036 1200 0.1001300 0.1

Seite 20 - Table 8--LED Indications

HOUSING2 SETSCREWS(HIDDEN)C99085Fig. 29---Removal of Motor and Blower WheelC99086Fig. 30_Burner Rack Removed2. Remove the 3 screws holding die blower

Seite 21 - (SeeFig.17-26)

Inspectthedrainpanandcondensatedrainlinewheninspectingthecoils.Cleanthedrainpanandcondensatedrainbyremovingallforeignmatterfromthepan.Flushthepananddr

Seite 22

SYMPTOMCompressor and condenser fanwill not start.Compressor will notstart but condenserfan runs,Three-phase scroll compressor(48GS048 and 48GX030-060

Seite 23 - I 4 1I0 116 217

eLocKorrP_.[Lr_ _e O'NL_'"11111 _11111111 IIIsuPeL_ae 3 --REARREQUIRED CLEARANCE TO COMBUSTIBLE MATL.INCHES [ram]TOP OF UNIT ...

Seite 24 - ; ii'_

Table 17--Troubleshooting Guide-HeatingSYMPTOM CAUSE REMEDYWater in gas line Drain. Install drip htg.No power to f_mace Check power supply fuses, widn

Seite 25

START-UP CHECKLIST(Remove and Store in Job File)I. PRELIMINARY INFORMATIONMODEL NO: ...

Seite 26 - "i. 'k

Seite 27 - Fig. 30_Burner Rack Removed

{4 t_:SUPPL_ D[TU_M0P_WING 0pEWIN_! i i_ 3 TOP VIEWREAR VIEWREQUIRED CLEARANCE TO COMmJSTIBLE MAll. REI_IIRB) CLEARANCEFOROPERATION AND SERVICINGINCHE

Seite 28

VACunit! _ii!_i_ iiiii!i!i!_i__Screw _.gnailer*FIasSuk__piefdSt_do _nf_ii_iI I_11 _H"Insusttion(fieldfield supplied --Du__l_ R_f_fieldsuppliedRoo

Seite 29 - Excessive head pressure

Y42x 3COO07048GS 48GXCORNER #030 036 042 048 060 030 036 042 048 0601 53.2 59.7 67.5 78.9 85.5 59.5 61.O 72.6 80.0 88.92 50.4 56.5 63,9 74.7 81,0 56,3

Seite 30

UNIT SIZE 48GSNOMINAL CAPACITY (ton)OPERATING WEIGHT (lb.)COMPRESSORSQuantityREFRIGERANT (R-22)Quantity (lb.)REFRIGERANT METERING DEVICEOrifice ID (in

Seite 31 - I. PRELIMINARY INFORMATION

UNIT SIZE 48GSNOMINAL CAPACITY (ton)OPERATING WEIGHT (lb.)COMPRESSORSQuantityREFRIGERANT (R-22)Quantity (lb.)REFRIGERANT METERING DEVICEOrifice ID (in

Seite 32

Table 2--Physical Data--Unit 48GXUNIT SIZE 48GXNOMINAL CAPACITY (ton)OPERATING WEIGHT (lb.)COMPRESSORSQuantityREFRIGERANT (R-22)Quantity (lb.)REFRIGER