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48TM016-028
Single-Package Rooftop Units
Electric Cooling/Gas Heating
Installation, Start-Up and Service Instructions
Untrained personnel can perform basic maintenance func-
CONTENTS
tions of cleaning coils and filters and replacing filters. All other
Page
operations should be performed by trained service personnel.
SAFETY CONSIDERATIONS........................1 When working on air-conditioning equipment, observe precau-
tions in the literature, tags and labels attached to the unit, and
INSTALLA
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Level by using unit frame as a reference; leveling tolerance is ± INSTALLATION 1 / in. per linear ft in any direction. See Fig. 3 for additional in- 16 Inspect unit for transportation damage. If damage is found, formation. Unit operating weight is shown in Table 1. file any claim with the transportation agency. Four lifting holes are provided in ends of unit base rails as Step 1 — Provide Unit Support shown in Fig. 3. Refer to rigging instructions on unit. ROOF CURB — Assemble and install access
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3 Fig. 2A — Roof Curb Details — 48TM016-025
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4 Fig. 2B — Roof Curb Details — 48TM028
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NOTES: 1. Dimensions in ( ) are in millimeters. 2. Refer to Fig. 4-6 for unit operating weights. 3. Remove boards at ends of unit and runners prior to rigging. 4. Rig by inserting hooks into unit base rails as shown. Use corner post from packaging to protect coil from damage. Use bumper boards for spreader bars on all units. 5. Weights do not include optional economizer. Add 90 lb (41 kg) for economizer weight. 6. Weights given are for aluminum evaporator and condenser coil plate fins. All panel
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6 Fig. 4 — Base Unit Dimensions — 48TM016,020
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7 Fig. 5 — Base Unit Dimensions — 48TM025
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8 Fig. 6 — Base Unit Dimensions — 48TM028
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Table 1 — Physical Data UNIT 48TM 016D/F 020D/F 025D/F 028D/F NOMINAL CAPACITY (tons) 15 18 20 25 OPERATING WEIGHT 1800 1850 1900 2270 Economizer 90 90 90 90 MoistureMi$er™ Dehumidification Package 40 40 40 40 COMPRESSOR/MANUFACTURER Scroll, Copeland 1...ZR94KC, 1...ZR108KC, 1...ZR125KC, 1...ZRU140KC,* Quantity...Model (Ckt 1, Ckt 2) 1...ZR72KC 1...ZR94KC 1...ZR108KC 1...ZR144KC Capacity Stages (%) 60, 40 55, 45 55, 45 50, 50 Number of Refrigerant Circuits 22 2 2 Oil (oz) (Ckt 1, Ckt 2) 85, 60 1
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Table 1 — Physical Data (cont) UNIT 48TM 016D/F 020D/F 025D/F 028D/F FURNACE SECTION Rollout Switch Cutout Temp (F)*** 190 190 190 190 Burner Orifice Diameter (in. ...drill size) Natural Gas Std 0.1285...30/0.136...29 0.1285...30/0.136...29 0.1285...30/0.136...29 0.1285...30/0.136...29 Thermostat Heat Anticipator Setting (amps) 208/230, 575 v Stage 1 0.98 0.98 0.98 0.98 Stage 2 0.44 0.44 0.44 0.44 460 v Stage 1 0.80 0.80 0.80 0.80 Stage 2 0.44 0.44 0.44 0.44 Gas Input Stage 1 172,000/225,000 206
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Step 3 — Field Fabricate Ductwork — Secure all Step 5 — Install Flue Hood and Wind Baffle — ducts to building structure. Use flexible duct connectors be- Flue hood and wind baffle are shipped secured under main tween unit and ducts as required. Insulate and weatherproof all control box. To install, secure flue hood to access panel. See external ductwork, joints, and roof openings with counter Fig. 10. The wind baffle is then installed over the flue hood. flashing and mastic in accordance with ap
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INDUCED DRAFT Step 7 — Orifice Change — This unit is factory as- MOTOR sembled for heating operation using natural gas at an elevation from sea level to 2000 ft. This unit uses orifice type LH32RFnnn, where “nnn” indicates the orifice size based on drill size diameter in thousands of an inch. HIGH ELEVATION (Above 2000 ft) — Use accessory high altitude kit when installing this unit at an elevation of 2000 to 7000 ft. For elevations above 7000 ft, refer to Table 2 to identi- fy the correct orific
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Field wiring must confirm to temperature limitations for Step 8 — Install Gas Piping — Unit is equipped for type “T” wire. All field wiring must comply with NEC and lo- use with natural gas. Installation must conform with local cal requirements. building codes or, in the absence of local codes, with the National Fuel Gas Code, ANSI Z223.1. Transformer no. 1 is wired for 230-v unit. If 208/230-v unit 1 is to be run with 208-v power supply, the transformer must be Install field-supplied manual gas
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OPTIONAL NON-FUSED DISCONNECT — On units with THERMOSTAT ASSEMBLY the optional non-fused disconnect, incoming power will be REMOVABLE JUMPER wired into the disconnect switch. Refer to Fig. 17 for wiring L RC Y1 Y2 W1 for 100 and 200 amp disconnect switches. Units with an RH W2 GC X MOCP (maximum overcurrent protection) under 100 will use the 100 amp disconnect switch. Units with an MOCP over 100 W2 C R Y1 Y2 W1 G X will use the 200 amp disconnect switch. Refer to the applicable disconnect wiring
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Table 5 — Electrical Data COMPRESSOR VOLTAGE POWER COMBUSTION POWER NOMINAL OFM IFM UNIT RANGE EXHAUST FAN MOTOR SUPPLY VOLTAGE No. 1 No. 1A No. 2 48TM (3 Ph, 60 Hz) Min Max RLA LRA RLA LRA RLA LRA Qty Hp FLA (ea) Hp FLA FLA LRA FLA MCA MOCP* — — 0.57 82/82 110/110 208/230 187 253 32.1 195 — — 20.7 156 3 0.5 1.7 5.0 15.8/15.8 4.6 18.8 0.57 86/86 110/110 — — 0.30 41 50 016 460 414 508 16.4 95 — — 10 70 3 0.5 0.8 5.0 7.9 2.3 6.0 0.30 43 50 — — 0.57 31 40 575 518 633 12 80 — — 8.2 54 3 0.5 0.75 5.0
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Step 10 — Make Outdoor-Air Inlet Adjust- ments 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. 18). Fig. 19 — Outdoor-Air Hood Component Location Fig. 18 — Standard 25% Outdoor-Air Section Deta
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Accessory 0° F Low Ambient Kit — Install the accessory 0° F Step 12 — Install All Accessories — After all the low ambient kit per instruction supplied with accessory. factory-installed options have been adjusted, install all field- installed accessories. Refer to the accessory installation Sensor Assembly — Install the sensor assembly in the location instructions included with each accessory. shown in Fig. 23. MOTORMASTER® I CONTROL INSTALLATION Motor Mount — To ensure proper fan height, replace
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MOTORMASTER® V CONTROL INSTALLATION FROM FUSE BLOCK (48TM025 Only) Install Field-Fabricated Wind Baffles — Wind baffles must be field-fabricated for all units to ensure proper cooling cycle operation at low ambient temperatures. See Fig. 22 for baffle details. Use 20-gage, galvanized sheet metal, or similar corrosion-resistant metal for baffles. Use field-supplied screws 1 to attach baffles to unit. Screws should be / -in. diameter and 4 5 / -in. long. Drill required screw holes for mounting baf
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into the fan section, down along the back side of the fan, and Step 13 — Adjust Factory-Installed Options along the fan deck over to the supply-air opening. PREMIERLINK™ CONTROL — The PremierLink control- The SAT probe is wire-tied to the supply-air opening (on the ler is available as a special order from the factory and is horizontal opening end) in its shipping position. Remove the compatible with the Carrier Comfort Network® (CCN) sys- sensor for installation. Re-position the sensor in the fl
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J4 DISCRETE RED WHT BLK J6 ANALOG J5 0-20mA IN J4 DISCRETE 20 1 SPT BLUE 2 BLU TSTAT CONTROL PremierLink COM BRN 3 BRN GRN Control STO G BLK 4 BLK RED COM YEL GRN BRN 5 Y1 BRN RED SAT 6 ORN WHT BLU ORN Y2 PL1 - 5 RED COM BRN BRN 7 BRN SAT WHT OAT W1 PL1 - 6 8 VIO VIO RED VIO COM PNK BRN 9 W2 BRN RED IAQI RED 10 RED ORN ENTH RED 11 BLU COM BRN 12 BRN SWITCH 1 4 OAQ BLU 13 BLU POSITION 0 LEN NO ACTION POSITION 1 CCN LOAD FACTORY DEFAULTS ON POWERUP 14 DDC OAT PNK CONTROL GRN 15 GRN RMTOCC RED 16 R
