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Fabricant : Carrier
Taille : 1.21 mb
Nom Fichier : 38ak-1sim.pdf
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Insulation must be rated 167 F (75 C) minimum. CONDENSER FANS — The fans must rotate counterclockwise when viewed from above. If necessary, correct direction of fan rotation by interchanging any 2 power input wires at disconnect switch. Affix crankcase heater decal (located in installer’s packet) to unit disconnect switch. FIELD CONNECTIONS 1. Main Power — Bring wires from the fused disconnect switch through hole in bottom rail of unit to control box (Fig. 6, 7, 8) and connect terminals 1111, [12 13 on line side of terminal block TB1 (see Fig. 9). To comply with NEC Article 440-14, the disconnect must be located within sight from and readily accessible from unit. • 2. 24-v Control Power — Units have single point power connections. Control circuit is directly connected internally to unit. Maximum 24-v control circuit is 3 amps. NOTE: For wire runs up to 50 ft. use no. 18 AWG insulated wire (35 C min.). For 50 to 75 ft., use no. 16 AWG insulated wire (35 C min.). For over 75 ft. use 14 AWG insulated wire (35 C min.). 3. Control Circuit Interlock — An airflow switch may be installed in the indoor air handler to prevent unit from running when indoor air is not flowing. This switch (no. HR81JE001) is available from Service Parts Center, or equivalent can be field supplied. This should be electrically interlocked in the control circuit, between terminals | 1 1 and | 6 1 (for flow switch) on TB2. See Fig. 9 for field wiring. This is in the 115-v circuit. Wires must be run in conduit with ground wire. 4. Transformer Connections — See unit wiring label diagram, notes 1 and 2, located behind compressor compartment end access door. UNBALANCED 3-PHASE SUPPLY VOLTAGE — Never operate a motor where a phase imbalance in supply voltage is greater than 2%. Use the following formula to determine the % voltage imbalance: % Voltage Imbalance max voltage deviation from average voltage i ^ = 100 x average voltage Example: Supply voltage is 240-3-60. AB = 243 volts BC = 236 volts AC = 238 volts Average Voltage = 243 + 236 + 238 = 239 volts Determine maximum deviation from average voltage: (AB) 243 - 239 = 4 volts (BC) 239 - 236 = 3 volts (AC) 239 - 238 = 1 volt Maximum deviation is 4 volts. Determine % voltage imbalance: % Voltage Imbalance = 100 x —— = 1.7% 239 This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%. IMPORTANT: Contact your local electric utility company immediately if the supply voltage phase imbalance is more than 2%. IMPORTANT: Ensure power to the crankcase heater is always on (except when servicing the unit). If circuit breakers inside unit shut down the compressor and condenser fans, crankcase heater remains on. 6 HINGED ACCESS DOOR NOTES: 1 3. THERE MU5T BE [1220 mm] 4 ft FOR SERVICE AND FOR UNRESTRICTED AIRFLOW ON ALL SIDES OF UNIT. THERE MUST BE MINIMUM C2440 mm] 8 ft CLEAR AIR SPACE ABOVE UNIT. THE APPROXIMATE OPERATING WEIGHT OF THE UNIT IS: 60 HZ 50 HZ UNIT WT LBS WT KG 38AK024 1456 661 38AK024C 1580 717 UNIT WT LBS WT KG 38AK024 1456 661 38AK024C 1580 717 CONTROL BOX NOTE: "C" INDICATES COPPER COIL. 2 4 APPROX. OPER. WT. (LB.) AT SUPPORT POINTS COMPR SECTION 60 Hz 1 2 3 4 TOT. 024 024C 411 448 501 533 245 273 299 326 1456 1580 50 Hz 024 024c 587 626 433 462 486 518 358 382 1864 1988 [63.5-92.1] 2 1/2'-: FIELD MAIN POWER SU HINGED ACCES [61] 2 7/16 [19.1] 3/4' dia; MOUNTING HOLES (TYP 4 PLACES) [63.5-92.1] 2 1/2'-3 5/8'DIA. FIELD POWER ENTRY 8 LIFTING [22.2] 7/8' DIA. FIELD CONTROL POWER ENTRY Fig. 6 — Dimensioi ECVIION IF AN No. H IF AN No. 2 5/8' DIA. LY [22.23 7/8' DIA. FIELD CONTROL CIRCUIT WIRING TOP VIEW 10'-7 13/16' SIDE VIEW I Drawing, 38AK024 7 NOTES: 1. THERE MUST BE [1220 mm] 4 ft FOR SERVICE AND FOR UNRESTRICTED AIRFLOW ON ALL SIDES OF UNIT. 2. THERE MUST BE MINIMUM [2440 mm] 8 ft CLEAR AIR SPACE ABOVE UNIT. 3. THE APPROXIMATE OPERATING WEIGHT OF THE UNIT IS: HINGED AC 60 HZ 50 HZ UNIT WT LBS WT KG 38AK028 1650 748 38AK028C 1804 818 38AK034 1803 818 38AK034C 2009 911 UNIT WT LBS WT KG 38AK028 1650 748 38AK028C 1804 818 38AK034 1803 818 38AK034C 2009 911 [22.2] 7/8 FIELD CONTROL CII [63.5-92.1] 2 1/2'-3 FIELD MAIN POWER ! APPROX. OPER. WT. (LB.) AT SUPPORT POINTS CONTRC NOTE: “C" INDICATES COPPER COIL. 60 Hz 1 2 3 4 TOT. 028 028C 034 034C 418 462 459 518 626 666 673 719 242 276 272 323 364 400 399 449 1650 1804 1803 2009 50 Hz 025 025C 030 030C 590 632 628 683 507 542 538 586 590 632 628 683 506 541 538 586 2193 2347 2332 2538 Fig. 7 — Dir ESS DOOR- i ; DIA. UIT WIRING 8' OIA. JPLY BOX W, ), I I I I 4 <7 ..J r___J COMPIS SECTION IF AM No. 1 No. 2 TOP VIEW FIELD CONTROL POWER ENTRY insional Drawing, 38AK028,034 SIDE VIEW 8 NOTES: 1. THERE MUST BE £1220 ram] 4 Ft FOR SERVICE AND FOR UNRESTRICTED AIRFLOW ON ALL SIDES OF UNIT. 2. THERE MUST BE MINIMUM [2440 mm] 8 ft CLEAR AIR SPACE ABOVE UNIT. 3. THE APPROXIMATE O...