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Carrier 48EJ User Manual Download Page 30

PACKAGED SERVICE TRAINING

Our packaged service training programs provide an excellent way to increase your knowledge of the
equipment discussed in this manual. Product programs cover:

• Unit Familiarization
• Installation Overview

• Maintenance
• Operating Sequence

A large selection of product, theory, and skills programs is available. All programs include a video
cassette and/or slides and a companion booklet. Use these for self teaching or to conduct full training
sessions.

For a free Service Training Material Catalog (STM), call 1-800-962-9212. Ordering instructions are
included.

Copyright 1995 Carrier Corporation

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

Book 1
Tab

1a

PC 111

Catalog No. 534-807

Printed in U.S.A.

Form 48HJ-9SI

Pg 30

2-95

Replaces: 48HJ-5SI

Summary of Contents for 48EJ

Page 1: ...nd liquids in the vicinity of this or any other appliance What to do if you smell gas 1 DO NOT try to light any appliance 2 DO NOT touch any electrical switch or use any phone in your building 3 IMMEDIATELY call your gas supplier from a neigh bor s phone Follow the gas supplier s instructions 4 If you cannot reach your gas supplier call the fire department Disconnect gas piping from unit when pres...

Page 2: ... 29 1880 08 61 49 159 18 25 89 371 LEGEND COMP SECT Compressor Section NOTES 1 Roof curb accessory is shipped unassembled 2 Insulated panels 1 2 in thick neoprene coated 2 lb density 3 Dimensions in are in millimeters 4 Direction of airflow 5 Roof curb 18 gage steel 6 Attach all ductwork to roof curb 7 Field installation of sidewall is mandatory NOTE To prevent the hazard of stagnant water build u...

Page 3: ...f the National Fuel Gas Code ANSI Z223 1 American National Standards Institute Although unit is weatherproof guard against water from higher level runoff and overhangs Locate mechanical draft system flue assembly at least 4 ft from any opening through which combustion products could enter the building and at least 4 ft from any adjacent building When unit is located adjacent to public walkways flu...

Page 4: ...462 1238 1494 1323 1579 Maximum Allowable Rpm 1550 1550 1550 1550 Motor Pulley Pitch Diameter in 3 4 4 4 4 3 5 3 5 4 6 6 5 8 7 0 Fan Pulley Pitch Diameter in 5 2 6 4 7 9 7 9 Belt Quantity Type Length in 1 AX 42 1 B 45 1 BX 50 1 BX 51 Factory Speed Setting Rpm 1293 1279 1366 1451 Motor Hp Service Factor 3 7 1 15 3 1 15 5 1 15 10 1 15 Motor Frame Size 56H 56H 184T 215T FURNACE SECTION Rollout Switch...

Page 5: ...ory roof curb only 5 Minimum clearance a Rear 78 09 2134 for coil removal This dimension can be reduced to 48 09 1219 if conditions permit coil removal from the top b Left side 48 09 1219 for proper condenser coil airflow c Front 48 09 1219 for control box access d Right side 48 09 1219 for proper operation of damper and power exhaust if so equipped e Top 68 09 1829 to assure proper condenser fan ...

Page 6: ... if so equipped f Top 6809 1829 to assure proper condenser fan operation g Bottom 149 356 to combustible surfaces when not using curb h Control box side 3809 914 to ungrounded sur faces non combustible i Control box side 3869 1067 to block or concrete walls or other grounded surfaces j Local codes or jurisdiction may prevail 6 With the exception of clearance for the condenser coil and the damper p...

Page 7: ...ct work may be connected as shown in Fig 7 and 8 Attach all ductwork to roof curb and roof curb basepans Step 5 Install Flue Hood Flue hood is shipped secured to a baffle under main control box To install secure flue hood to access panel See Fig 9 NOTE When properly installed flue hood will line up with combustion fan housing See Fig 10 NOTE Do not drill in this area damage to basepan may result i...

Page 8: ... Fuel Gas Code ANSI Z223 1 Install manual gas shutoff valve with a 1 8 in NPT pres sure tap for test gage connection at unit Field gas piping must include sediment trap and union See Fig 13 Do not pressure test gas supply while connected to unit Always disconnect union before servicing Natural gas pressure at unit gas connection must not be less than 5 in wg or greater than 13 5 in wg Size gas sup...

Page 9: ...0 5 84 5 84 5 0 57 65 65 100 100 64 64 324 324 4 6 18 8 0 57 70 70 100 100 70 70 343 343 460 414 508 19 9 114 3 0 8 1 9 3 7 4 8 42 3 0 30 32 50 32 162 2 3 6 0 0 30 34 50 34 168 575 518 632 16 0 91 3 0 75 1 5 3 3 9 23 4 0 57 26 40 26 119 2 1 4 8 0 57 28 40 29 124 017 208 230 187 254 28 2 160 28 2 160 3 1 7 24 8 5 15 8 15 8 105 91 0 57 84 84 110 100 90 90 499 485 4 6 18 8 0 57 89 89 110 110 95 95 51...

Page 10: ...ed Step 9 Make Outdoor Air Inlet Adjustments MANUAL OUTDOOR AIR DAMPER All units except those equipped with a factory installed economizer have a manual outdoor air damper to provide ventilation air Damper can be preset to admit up to 25 outdoor air into return air compartment To adjust loosen securing screws and move damper to desired setting then retighten screws to secure damper Fig 16 OPTIONAL...

Page 11: ...ten screws 7 Insert outdoor air inlet screens and spacer in channel created by lower filter retainer and filter support bracket 8 Attach remaining shorter section of filter support bracket Fig 17 Economizer DamperAssembly End View LED Light Emitting Diode Fig 18 Economizer Motor Control Module Fig 19 Economizer Motor Control Module Location Fig 20 Outdoor Air Hood Component Location Fig 21 Seal St...

Page 12: ...an Perfor mance Adjustment section on page 19 Be sure that fans ro tate in the proper direction See Table 6 for air quantity lim its See Table 7 for static pressure drops for accessories and options See Fig 23 and 24 for fan performance using hori zontal adapter and power exhaust To alter fan performance see Performance Adjustment sections on page 19 Condenser Fans and Motors Condenser fans and mo...

Page 13: ... 1242 1900 2 16 1313 2129 2 43 1381 2362 2 69 1446 2599 2 96 1509 2839 3 23 4500 1264 2089 2 38 1333 2322 2 65 1399 2558 2 91 1463 2799 3 19 1525 3042 3 47 4750 1286 2290 2 61 1354 2528 2 88 1419 2769 3 15 1482 3012 3 43 1542 3259 3 71 5000 1310 2507 2 86 1376 2748 3 13 1440 2992 3 41 1501 3240 3 69 1560 3489 3 98 5250 1335 2737 3 12 1399 2983 3 40 1461 3230 3 68 1522 3481 3 97 5500 1360 2981 3 40...

Page 14: ...2 1900 2 16 1313 2129 2 43 1381 2362 2 69 1446 2599 2 96 1509 2839 3 23 4500 1264 2089 2 38 1333 2322 2 65 1399 2558 2 91 1463 2799 3 19 1525 3042 3 47 4750 1286 2290 2 61 1354 2528 2 88 1419 2769 3 15 1482 3012 3 43 1542 3259 3 71 5000 1310 2507 2 86 1376 2748 3 13 1440 2992 3 41 1501 3240 3 69 1560 3489 3 98 5250 1335 2737 3 12 1399 2983 3 40 1461 3230 3 68 1522 3481 3 97 5500 1360 2981 3 40 142...

Page 15: ...928 3 3 1238 3332 3 7 1313 3755 4 2 1385 4192 4 7 1454 4643 5 2 5700 1175 3158 3 5 1251 3569 4 0 1324 3999 4 5 1395 4445 5 0 1462 4906 5 5 6000 1188 3398 3 8 1262 3814 4 3 1334 4250 4 8 1403 4704 5 3 1470 5173 5 8 6300 1203 3654 4 1 1275 4075 4 6 1344 4517 5 1 1412 4976 5 6 1478 5453 6 1 6400 1221 3944 4 4 1290 4370 4 9 1358 4817 5 4 1424 5283 5 6 1489 5765 6 5 6900 1238 4245 4 8 1305 4676 5 2 137...

Page 16: ...39 6 88 7500 1309 5143 5 58 1372 5597 6 08 1434 6067 6 59 1494 6558 7 12 1548 7014 7 62 8000 1349 5833 6 33 1409 6297 6 84 1467 6779 7 36 1529 7313 7 94 8500 1390 6600 7 17 1447 7077 7 68 1504 7571 8 22 9000 1433 7446 8 08 1488 7938 8 62 9500 1478 8378 9 10 10000 1524 9396 10 20 LEGEND Bhp Brake Horsepower Input to Fan FIOP Factory Installed Option Watts Input Watts to Motor NOTES 1 Boldface indic...

Page 17: ...the 48HJE015 48HJE017 and HJD025 units have 2 stages of heat First Stage Turn unit power on Open manual gas line valve Set thermostat system switch at HEAT or AUTO po sition and set fan switch to AUTO position for heating First stage thermostat calls for heat Time delay relay for evaporator fan begins timer sequence Induced draft relay closes and induced draft motor starts Pressure switch closes a...

Page 18: ...ve motor and wheel assembly by removing screws holding motor mounting plate to top of com bustion fan housing Fig 25 and 26 The motor and wheel assembly will slide up and out of the fan housing Remove the blower wheel from the motor shaft and clean with a de tergent or solvent Replace motor and wheel assembly EVAPORATOR COIL Clean as required with commer cial coil cleaner CONDENSER COIL Clean cond...

Page 19: ...y of pulley hub and tighten setscrew To align fan and motor pulleys 1 Loosen fan pulley setscrews 2 Slide fan pulley along fan shaft 3 Make angular alignment by loosening motor from mount ing plate SERVICE AND REPLACEMENT See Fig 29 NOTE To remove belts only follow Steps 1 7 1 Remove filter and supply air section panels 2 Remove unit top cover 3 Remove coil guard 4 Loosen screws A and B on both si...

Page 20: ...justment 48HJ015 017 UNITS Fig 31 1 Shut off unit power supply 2 Remove access panel s closest to the fan to be adjusted 3 Loosen fan hub setscrews 4 Adjust the fan height on the shaft using a straightedge placed across the fan orifice 5 Tighten setscrews and replace panel s 6 Turn on unit power 48HJ025 UNITS Fig 32 1 Shut off unit power supply 2 Remove fan top grille assembly and loosen fan hub s...

Page 21: ...temperature test results 1 LED should be off 2 Motor drives toward closed Power Failure Dampers have a spring return In event of power failure dampers will return to fully closed position until power is restored Do not manually operate damper motor Refrigerant Charge Amount of refrigerant charge is listed on unit nameplate and in Table 1 Refer to Carrier GTAC II Module 5 Charging Recovery Recyclin...

Page 22: ...d to valve terminals 3 and 4 the pilot valve opens to the preset position When power is sup plied to terminals 1 and 2 the main valve opens to its preset position The regular factory setting is stamped on the valve body 3 5 in wg To adjust regulator 1 Set thermostat at setting for no call for heat 2 Turn main gas valve to OFF position 3 Remove 1 8 in pipe plug from manifold or gas valve pres sure ...

Page 23: ...uid refrigerant by oil in the crankcase when the compressor is idle Since power for the crankcase heaters is drawn from the unit incoming power main unit power must be on for the heaters to be energized IMPORTANT After a prolonged shutdown or serv ice job energize the crankcase heaters for 24 hours before starting the compressors Compressor Lockout If any of the safeties high low pressure freeze p...

Page 24: ...Fig 38 Typical Wiring Schematic 48HJ025 Shown 24 ...

Page 25: ...Fig 38 Typical Wiring Schematic 48HJ025 Shown cont 25 ...

Page 26: ...Fig 39 Typical Component Arrangement 48HJ025 Shown 26 ...

Page 27: ...S Rollout Switch SN Sensor SW Switch TB Terminal Block TC Thermostat Cooling TDR Time Delay Relay TH Thermostat Heating TRAN Transformer Terminal Marked Terminal Unmarked Terminal Block Splice Splice Marked Splice Field Supplied Factory Wiring Field Control Wiring Field Power Wiring Accessory or Optional Wiring To Indicate Common Potential Only Not To Represent Wiring NOTES 1 Compressor and fan mo...

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Page 30: ...e All programs include a video cassette and or slides and a companion booklet Use these for self teaching or to conduct full training sessions For a free Service Training Material Catalog STM call 1 800 962 9212 Ordering instructions are included Copyright 1995 Carrier Corporation Manufacturer reserves the right to discontinue or change at any time specifications or designs without notice and with...

Page 31: ......

Page 32: ...LTAGE L1 L2 L2 L3 L3 L1 COMPRESSOR AMPS COMPRESSOR NO 1 L1 L2 L3 COMPRESSOR NO 2 L1 L2 L3 SUPPLY FAN AMPS EXHAUST FAN AMPS TEMPERATURES OUTDOOR AIR TEMPERATURE F DB Dry Bulb RETURN AIR TEMPERATURE F DB F WB Wet Bulb COOLING SUPPLY AIR F GAS HEAT SUPPLY AIR F PRESSURES GAS INLET PRESSURE IN WG GAS MANIFOLD PRESSURE STAGE NO 1 IN WG STAGE NO 2 IN WG REFRIGERANT SUCTION CIRCUIT NO 1 PSIG CIRCUIT NO 2...

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