Carrier SINGLE PACKAGE ROOFTOP UNITS ELECTRIC COOLING/GAS HEATING 48HJ015-025 manuale d’uso

Installation Instructions CONTENTS Page SAFETY CONSIDERA TIONS ...................1 INST ALLA TION ............................. 1-12 Step 1 — Provide Unit Support ...............1 • ROOF CURB • AL TERNA TE UNIT SUPPOR T Step 2 — Rig and Place Unit ..................3 • POSITIONING • ROOF MOUNT Step 3 — Field Fabricate Ductwork ......[...]

ACCESSOR Y P ACKAGE NO. CURB HEIGHT DESCRIPTION ‘ ‘A ’’ ‘ ‘B’ ’ ‘ ‘C’’ 50PQ900221 1 8 -2 9 (305) Standard Curb — 14 9 High —— — 50PQ900141 2 8 -0 9 (610) Standard Curb for Units Requiring High Installation —— — 50PQ900151 2 8 -0 9 (610) Horizontal Supply and Return Curb 5 8 -6 9 (1676) 0 8 -2 1 ⁄ 2 9 (64) 1 8[...]

AL TERNA TE UNIT SUPPOR T — When the curb cannot be used, install unit on a noncombustible surface. Support unit with sleepers, using unit curb support area. If sleepers cannot be used, support long sides of unit with a minimum of 3 equally spaced 4-in. x 4-in. pads on each side. Step 2 — Rig and Place Unit — Inspect unit for trans- portation[...]

T able 1 — Physical Data UNIT SIZE 48 HJD015/HJE015 HJE017 HJD025 208/230, 460 V 575 V OPERA TING WT (lb) Al/Al* 1640/1660 2010 2235 Unit Al/Cu* 1770/1790 2160 2385 Cu/Cu* 1840/1860 2250 2515 Economizer 11 0 11 0 11 0 Roof Curb† 200 200 200 COMPRESSOR 06D Semi-Hermetic Number 12 2 Cylinders 64 6 REFRIGERANT TYPE R-22 Charge (lb) System 1 22.50 [...]

UNIT 48HJ MAXIMUM SHIPPING WEIGHT Lb Kg D015 1920 871 E015 1940 880 E017 2310 1048 UNIT 48HJ DIMENSIONS XY Ft-in. mm Ft-in. mm D015 3-2 965 4-0 1219 E015 3-2 965 4-0 1219 E017 3-7 3 ⁄ 8 1 102 3-6 5 ⁄ 8 1083 UNIT 48HJ WEIGHT OF CORNER* ABCD Lb Kg Lb Kg Lb Kg Lb Kg D015 365 166 360 163 373 169 540 245 E015 372 169 363 165 377 171 547 248 E017 509[...]

MAXIMUM SHIPPING WEIGHT Lb Kg 2535 1 150 NOTES: 1. Dimensions in ( ) are in millimeters. 2. Center of gravity . 3. Direction of airflow . 4. Ductwork to be attached to accessory roof curb only . 5. Minimum clearance: a. Rear: 7 8 0 9 (2134) for coil removal. This dimen- sion can be reduced to 4 8 0 9 (1219) if conditions permit coil removal from t[...]

Step 3 — Field Fabricate Ductwork — Secure all ducts to building structure. Use flexible duct connectors be- tween unit and ducts as required. Insulate and weatherproof all external ductwork, joints, and roof openings with counter flashing and mastic in accordance with applicable codes. Ducts passing through an unconditioned space must be ins[...]

S t e p6—T r a p Condensate Drain — See Fig. 1 1 for drain location. One 3 ⁄ 4 -in. half coupling is provided inside unit evaporator section for condensate drain connec- tion. An 8 1 ⁄ 2 in. x 3 ⁄ 4 -in. diameter and 2-in. x 3 ⁄ 4 -in. diameter pipe nipple, coupled to standard 3 ⁄ 4 -in. diameter elbows, pro- vides a straight path dow[...]

Step 8 — Make Electrical Connections FIELD POWER SUPPL Y — Unit is factory wired for volt- age shown on unit nameplate. When installing units, provide a disconnect per NEC (National Electrical Code) of adequate size (T able 2). All field wiring must comply with NEC and local requirements. Route power and ground lines through control box end pa[...]

Use the following formula to determine the percent volt- age imbalance. % V oltage Imbalance: = 100 x max voltage deviation from average voltage average voltage EXAMPLE: Supply voltage is 460-3-60. AB =452 v BC =464 v AC =455 v A verage V oltage = 452 +464 +455 3 = 1371 3 = 457 Determine maximum deviation from average voltage: (AB) 457 −452 =5 v [...]

5. Loosen sheet metal screws for top cover of base unit located above outdoor-air inlet opening. 6. Match notches in hood top cover with unit top cover screws. Insert hood flange between top cover flange and unit. T ighten screws. 7. Insert outdoor-air inlet screens and spacer in channel created by lower filter retainer and filter support brack[...]

ST ART -UP Use the following information and Start-Up Checklist on page CL-1 to check out unit PRIOR to start-up. Unit Preparation — Check that unit has been installed in accordance with these installation instructions and appli- cable codes. Compressor Mounting — Loosen the compressor hold- down bolts until sidewise movement of the washer unde[...]

T able 3A — Fan Performance Data, 48HJ015, 208/230, 460-V Units AIRFLOW (CFM) EXTERNAL ST A TIC PRESSURE (in. wg) 0.2 0.4 0.6 0.8 1.0 Rpm W atts Bhp Rpm Watts Bhp Rpm W atts Bhp Rpm W atts Bhp Rpm Watts Bhp 3750 741 510 0.58 854 715 0.82 952 921 1.05 1041 1 130 1.29 1 124 1344 1.53 4000 773 647 0.74 882 859 0.98 978 1071 1.22 1064 1285 1.46 1 145[...]

T able 3B — Fan Performance Data, 48HJ015, 575-V Units AIRFLOW (CFM) EXTERNAL ST A TIC PRESSURE (in. wg) 0.2 0.4 0.6 0.8 1.0 Rpm W atts Bhp Rpm Watts Bhp Rpm W atts Bhp Rpm W atts Bhp Rpm Watts Bhp 3750 741 510 0.58 854 715 0.82 952 921 1.05 1041 1030 1.29 1 124 1344 1.53 4000 773 647 0.74 882 859 0.98 978 1071 1.22 1064 1285 1.46 1 145 1502 1.71[...]

T able 4 — Fan Performance Data, 48HJ017 Units AIRFLOW (CFM) EXTERNAL ST A TIC PRESSURE (in. wg) 0.2 0.4 0.6 0.8 1.0 Rpm W atts Bhp Rpm Watts Bhp Rpm W atts Bhp Rpm W atts Bhp Rpm Watts Bhp 4500 630 805 0.9 741 1059 1.2 846 1341 1.5 945 1653 1.9 1039 1993 2.2 4800 659 943 1.1 765 1208 1.4 865 1497 1.7 961 1816 2.0 1052 2163 2.4 5100 688 1094 1.2 [...]

T able 5 — Fan Performance Data, 48HJ025 Units AIRFLOW (CFM) EXTERNAL ST A TIC PRESSURE (in. wg) 0.2 0.4 0.6 0.8 1.0 Rpm W atts Bhp Rpm Watts Bhp Rpm W atts Bhp Rpm W atts Bhp Rpm Watts Bhp 6000 800 1732 1.88 891 2047 2.22 975 2376 2.58 1055 2728 2.96 1 133 3104 3.37 6500 853 2134 2.32 939 2471 2.68 1018 2819 3.06 1094 3185 3.46 1 167 3573 3.88 7[...]

T able 7 — Accessory/FIOP Economizer Static Pressure (in. wg) UNIT 480HJ UNIT VOL T AGE CFM ECONOMIZER PRESSURE DROP 015, 017 All 3,750 .03 4,000 .03 5,000 .05 6,000 .07 7,500 .10 025 All 6,000 .07 7,200 .09 9,000 .1 1 10,000 .12 LEGEND BHP — Brake Horsepower FIOP — Factory-Installed Option NOTES: 1. The factory-assembled horizontal adapter s[...]

SERVICE Before performing service or maintenance operations on unit, turn of f main power switch to unit. Electrical shock could cause personal injury. Cleaning — Inspect unit interior at beginning of each heat- ing and cooling season and as operating conditions require. Remove unit top panel and/or side panels for access to unit interior . MAIN [...]

F AN SHAFT BEARINGS — For 015 units, the bearings are permanently lubricated. No field lubrication is required. For 017 and 025 units, the bearings are of the pillow block type and have grease fittings. The bearing opposite the motor end has an extended tube line so it can be lubricated from the motor side. Lubricate the bearings twice annually[...]

SER VICE AND REPLACEMENT (See Fig. 30) — The 48HJ017,025 units use a fan motor mounting system that features a slide-out motor mounting plate. T o replace or serv- ice the motor , slide out the bracket. 1. Remove the evaporator-fan access panel and the heat- ing control access panel. 2. Remove the center post (located between the evaporator fan a[...]

5. Set the outdoor -air thermostat (OA T), located in the econo- mizer section of the unit to 75 F . 6. If the outdoor temperature is below 75 F , the econo- mizer will control the mixed air with the mixed-air sen- sor . If the outdoor air is above 75 F , place a jumper around the contacts of the OA T . 7. Jumper terminal T to terminal T1 on the mo[...]

Pilot Adjustment 1. Set system selector switch at OFF position to shut of f unit. T urn of f power to unit. 2. Remove screw cap cover on pilot gas valve to expose adjusting screw (See Fig. 36). 3. T urn valve knobs to pilot position. 4. T urn on power to unit. Set system selector switch to HEA T position and set thermostat to a setting that will ca[...]

Main Burners — For most applications, main burners are factory set and should require no adjustment. However , if burner adjustment is necessary: 1. Perform pilot adjustment. 2. T urn gas valve to ON position. Allow unit to operate at least 15 minutes with burner access panel in place. 3. Remove access panel. 4. Loosen primary air shutter (Fig. 3[...]

Fig. 38 — T ypical Wiring Schematic (48HJ025 Shown) 24[...]

Fig. 38 — T ypical Wiring Schematic (48HJ025 Shown) (cont) 25[...]

Fig. 39 — T ypical Component Arrangement (48HJ025 Shown) 26[...]

LEGEND FOR FIG. 38 and 39 AHA — Adjustable Heat Anticipator BKR W/A T — Breaks with Amp T urns C— Contactor , Compressor CB — Circuit Breaker CC — Cooling Compensator CH — Crankcase Heater CLO — Compressor Lockout CLS — Compressor Lockout Switch COMP — Compressor Motor CR — Control Relay CT — Current T ransformer DM — Damper[...]

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P ACKAGED 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. Al[...]

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ST ART -UP CHECKLIST MODEL NO.: DA TE: SERIAL NO.: TECHNICIAN: PRE-ST ART -UP: M VERIFY THA T ALL P ACKING MA TERIALS HA VE BEEN REMOVED FROM UNIT M REMOVE ALL SHIPPING HOLDDOWN BOL TS AND BRACKETS PER INSTRUCTIONS M VERIFY INST ALLA TION OF ECONOMIZER HOOD M VERIFY INST ALLA TION OF EXHAUST HOOD M VERIFY THA T CONDENSA TE CONNECTION IS INST ALLED [...]