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50TJ016-028
Single-Package Rooftop Units
Electric Cooling with Electric Heat Option
Installation, Start-Up and
Service Instructions
CONTENTS
Page
IMPORTANT: Units have high ambient operating lim-
its. If limits are exceeded, the unit will automatically
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . .1
lock the compressor out of operation. Manual reset will
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
be required to restart the com
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2 NOTES: PKG. NO. REF. CURB HEIGHT DESCRIPTION 1. Roof curb accessory is shipped disassembled. CRRFCURB010A00 1′-2″ (305) Standard Curb 14″ High 1 2. Insulated panels: 1″ thick neoprene coated 1 / lb density. 2 CRRFCURB011A00 2′-0″ (610) Standard Curb for Units Requiring High Installation 3. Dimensions in ( ) are in millimeters. CRRFCURB012A00 2′-0″ (610) Side Supply and Return Curb for High Installation 4. Direction of airflow. 5. Roof curb: 16 ga. (VA03-56) stl. 6. A 90 degree elbow must be in
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DIMENSIONS MAXIMUM UNIT SHIPPING WEIGHT AB 50TJ Lb Kg Ft-in. mm Ft-in. mm 1 016 1550 703 6-11 / 2121 4- 0 1219 2 1 020 1650 748 6-11 / 2121 3-10 1168 2 NOTE: For preassembled horizontal adapter roof curb part no. 1 CRRFCURB013A00, the accessory kit includes a factory-designed, 024 1700 771 6-11 / 2121 3- 7 1092 2 high-static, transition duct. For horizontal curb part no. 1 028 1850 839 6-11 / 2121 3- 5 1041 2 CRRFCURB012A00, a field-supplied transition duct is required. NOTES: Fig. 2 — Horizonta
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4 STD UNIT ECONOMI$ER CORNER CORNER CORNER CORNER DIM A DIM B DIM C WEIGHT WEIGHT (A) (B) (C) (D) UNIT Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Ft-in. mm Ft-in. mm Ft-in. mm 50TJ016 1550 703 80 36.3 391 177 365 166 384 174 410 186 3-5 1041 3-6 1067 1-10 559 50TJ020 1650 748 80 36.3 399 181 384 174 402 182 439 199 3-4 1016 3-6 1067 1- 8 508 NOTES: 1. Refer to print for roof curb accessory dimensions. 2. Dimensions in [ ] are in millimeters. 3. Center of gravity. 4. Direction of airflow. 5. Ductwork t
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5 STD UNIT ECONOMI$ER CORNER CORNER CORNER CORNER DIM ADIM BDIM C WEIGHT WEIGHT (A) (B) (C) (D) UNIT Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Ft-in. mm Ft-in. mm Ft-in. mm 50TJ024 1700 771 80 36.3 419 190 394 179 425 193 463 210 3-4 1016 3-5 1041 1-8 508 50TJ028 1850 839 80 36.3 428 194 412 187 511 232 499 226 3-2 965 3-7 1092 1-8 508 NOTES: 1. Refer to print for roof curb accessory dimensions. 2. Dimensions in [ ] are in millimeters. 3. Center of gravity. 4. Direction of airflow. 5. Ductwork to be
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Table 1 — Physical Data 016 UNIT 50TJ 020 024 028 208/230, 460 v 575 v NOMINAL CAPACITY (tons) 15 18 20 25 OPERATING WEIGHT 1550 1650 1700 1850 80 80 80 EconoMi$er 80 MoistureMiser Dehumidification 40 40 40 40 Package COMPRESSOR/MANUFACTURER Scroll, Copeland 1...ZR108KC, 1...ZR125KC, 1...ZR16M3, Quantity...Model (Ckt 1, Ckt 2) 2...ZR94KC 1...ZR94KC 1...ZR108KC 1...ZR125KC Capacity Stages (%) 50, 50 55, 45 55, 45 60, 40 Number of Refrigerant Circuits 2 22 2 Oil (oz) (Ckt 1, Ckt 2) 81, 81 106, 81
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Step 3 — Field Fabricate Ductwork — Secure all Step 4 — Make Unit Duct Connections — Unit ducts to building structure. Use flexible duct connectors be- is shipped for through-the-bottom duct connections. Ductwork tween unit and ducts as required. Insulate and weatherproof all openings are shown in Fig. 6. Field-fabricated concentric duct- external ductwork, joints, and roof openings with counter work may be connected as shown in Fig. 7 and 8. Attach all flashing and mastic in accordance with app
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IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact your local electric utility com- pany immediately. Unit failure as a result of operation on improper line voltage or excessive phase imbalance constitutes abuse and may cause damage to electrical components. FIELD CONTROL WIRING — Install a Carrier-approved accessory thermostat assembly according to the installation in- structions included with the accessory. Locate thermostat as- sembly on a solid wall in the conditioned
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Table 2 — Electrical Data NOMINAL COMPRESSOR VOLTAGE POWER ELECTRIC POWER OFM IFM UNIT VOLTAGE RANGE EXHAUST HEAT* SUPPLY No. 1 No. 2 50TJ (3 Ph, Min Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp FLA FLA LRA kW FLA MCA MOCP† 60 Hz) —— — — 81/81 100/100 4.6 18.8 —— 85/86 110/110 —— 26/34 71/82 102/116 110/125 4.6 18.8 26/34 71/82 108/122 110/125 208/230 187 253 28.8 195 28.8 195 3 0.5 1.7 3.7 10.5/11.0 —— 42/56 117/135 159/149 175/175 4.6 18.8 42/56 117/135 165/155 175/175 —— 56/75** 156/180 169/194 200
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Table 2 — Electrical Data (cont) NOMINAL COMPRESSOR VOLTAGE POWER ELECTRIC POWER OFM IFM UNIT VOLTAGE RANGE EXHAUST HEAT* SUPPLY No. 1 No. 2 50TJ (3 Ph, Min Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp FLA FLA LRA kW FLA MCA MOCP† 60 Hz) —— — — 130/130 150/150 4.6 18.8 —— 135/135 175/175 —— 26/34 71/82 130/138 150/150 4.6 18.8 26/34 71/82 135/143 175/175 208/230 187 253 41.0 350 37.8 239 2 1 6.6 10.0 28.0/28.0 —— 42/56 117/135 181/170 200/175 4.6 18.8 42/56 117/135 187/176 200/200 — - 56/75** 156/180
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OPTIONAL NON-FUSED DISCONNECT — On units with Step 7 — Make Outdoor-Air Inlet Adjustments the optional non-fused disconnect, incoming power will be MANUAL OUTDOOR-AIR DAMPER — All units (except wired into the disconnect switch. Refer to Fig. 13 for wiring those equipped with a factory-installed economizer) have a for 100 and 200 amp disconnect switches. Units with an manual outdoor-air damper to provide ventilation air. Damper MOCP under 100 will use the 100 amp disconnect switch. can be preset
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Table 3 — Heat Anticipator Settings 5. Loosen sheet metal screws for base unit top panel located above outdoor-air inlet opening, and remove screws for UNIT UNIT hood side panels located on the sides of the outdoor-air kW* STAGE 1 STAGE 2 50TJ VOLTAGES inlet opening. 26/34 .40 .66 6. Match notches in hood top panel to unit top panel screws. 208/230-3-60 42/56 .66 .40 56/75 .66 .66 Insert hood flange between unit top panel flange and unit. Tighten screws. 20 .40 .40 380-3-60 35 .40 .66 016-028 7.
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SENSOR OUTSIDE AIR SENSOR COVER Fig. 19 — Seal Strip Location (Air Hood Cross-Sectional View) BAFFLE (028 ONLY) Fig. 21 — Outdoor-Air Sensor Location MOUNTING SCREW LOWER FILTER RETAINER FILTER SUPPORT BRACKET SENSOR WIRING CONNECTIONS MOUNTING HOOD SIDE SCREW PANELS (2) HOOD TOP PANEL BAFFLE (028 ONLY) WIRING HARNESS Fig. 22 — Outdoor-Air Sensor Details LOWER FILTER RETAINER Refer to Table 4 to determine the sensors required for each FILTER SUPPORT strategy. BRACKET Differential Enthalpy Switch
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MECHANICAL COOLING LOCKOUT — Determine the DRY BULB CHANGEOVER SET UP — Determine the dry outdoor-air temperature at which you want the mechanical bulb changeover set point from Table 5. The settings are A, B, cooling (compressors) to be disabled. Locate the mechanical C and D. Locate the ECON SP potentiometer and set the dry cooling lockout (MECH CLG LOCKOUT) potentiometer. To bulb changeover set point. See Fig. 16. When the OAT is above disable this feature, turn the potentiometer countercloc
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VENTILATION AIR (Minimum Position Set Up) — If ven- tilation air is not required, skip this section. If ventilation air is required, perform the following: Personal Injury Hazard. Avoid possible injury by keep- 1. The indoor fan must be on to set the ventilation air. ing fingers away from damper blades. Either put the thermostat in the continuous fan mode or jumper the R and G terminals at the rooftop unit con- Step 9 — Install All Accessories — After all the nection board. factory-installed o
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Install Motormaster I Controls — Only one Motormaster I control is required per unit. The Motormaster I control must be used in conjunction with the Accessory 0° F Low Ambient Kit (purchased separately). The Motormaster I device controls out- door fan no. 1 while outdoor fans no. 2 and 3 are sequenced off by the Accessory 0° F Low Ambient Kit. Accessory 0° F Low Ambient Kit — Install the Accessory 0° F Low Ambient Kit per instruction supplied with accessory. Sensor Assembly — Install the sensor
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SENSOR SENSOR SENSOR SENSOR LOCATION LOCATION LOCATION LOCATION HAIRPIN END HAIRPIN END HAIRPIN END HAIRPIN END 50TJ016 50TJ020 50TJ024 50TJ028 NOTE: All sensors are located on the eighth hairpin up from the NOTE: All sensors are located on the eighth hairpin up from the bottom. bottom. Fig. 27 — Motormaster III Sensor Locations Fig. 26 — Motormaster® I Sensor Locations
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1. Connect service gages to suction and discharge pressure fittings. 2. Energize the compressor. 3. The suction pressure should drop and the discharge pres- sure should rise, as is normal on any start-up. If the suction pressure does not drop and the discharge pres- sure does not rise to normal levels: 1. Note that the evaporator fan is probably also rotating in the wrong direction. 2. Turn off power to the unit. 3. Reverse any two of the incoming power leads. 4. Turn on power to the compressor.
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Table 8 — Fan Performance — 50TJ016 50TJ016 (15 TONS)* Available External Static Pressure (in. wg) Airflow 0.2 0.4 0.6 0.8 1.0 1.2 (Cfm) Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts 4500 684 1.28 1102 791 1.49 1283 887 1.70 1466 977 1.92 1652 1061 2.13 1841 1139 2.36 2034 4800 715 1.47 1265 817 1.68 1451 910 1.90 1638 997 2.12 1828 1078 2.34 2021 1155 2.57 2217 5100 747 1.67 1442 844 1.89 1633 934 2.12 1825 1018 2.34 2019 1097 2.57 2216 1171 2.80 2416 5400
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Table 9 — Fan Performance — 50TJ020 and 024 50TJ020, 024 (18 and 20 TONS)* Available External Static Pressure (in. wg) Airflow 0.2 0.4 0.6 0.8 1.0 1.2 (Cfm) Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts 5,500 682 1.99 1675 760 2.29 1922 832 2.59 2177 901 2.90 2441 965 3.22 2712 1027 3.56 2990 6,000 730 2.38 2005 802 2.68 2257 871 2.99 2516 935 3.31 2783 997 3.63 3057 1056 3.97 3337 6,500 778 2.82 2373 846 3.13 2630 911 3.44 2893 972 3.76 3164 1031 4.09 3440
