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Carrier 38YCW manual

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Table of contents for the manual

  • Page 1

    38YCW 10 SEER Split-System Heat Pump Installation and Start-Up Instructions NOTE: Read the entire instruction manual before starting the installation. This symbol → indicates a change since the last issue. SAFETY CONSIDERATIONS Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock,[...]

  • Page 2

    INSTALLATION Step 1 — Check Equipment and Job Site UNPACK UNIT Move to final location. Remove carton, taking care not to damage unit. INSPECT EQUIPMENT File claim with shipping company prior to installation if shipment is damaged or incomplete. Locate unit-rating plate on unit-service panel. It contains information needed to properly install unit[...]

  • Page 3

    Step 8 — Make Piping Connections Relieve pressure and recover all refrigerant before system repair or final unit disposal to avoid personal injury or death. Use all service ports and open all flow-control devices, including solenoid valves. If ANY refrigerant tubing is buried, provide a 6 in. vertical rise at service valve. Refrigerant tubing len[...]

  • Page 4

    NOTE: Install branch-circuit disconnect of adequate size per NEC to handle unit-starting current. Locate disconnect within sight from and readily accessible from unit, per Section 440-14 of NEC. ROUTE GROUND AND POWER WIRES Remove access panel and control box to gain access to unit wiring. Extend wires from disconnect through power-wiring hole prov[...]

  • Page 5

    COOLING-ONLY PROCEDURE NOTE: If superheat- or subcooling-charging conditions are not favorable, charge must be weighed in accordance with unit-rating plate ±0.6 oz/ft of 3/8-in. liquid line above or below 15 ft respectively. EXAMPLE: To calculate additional charge required for a 25-ft line set: 25 ft – 15 ft = 10 ft X 0.6 oz/f t=6o zo f addition[...]

  • Page 6

    Fig. 6 — Typical 24v Circuit Connections A01384 24 V AC HOT R C W Y G R C RVS COOLING C W2 OTHER NON-PROGRAMMABLE HP THERMOST A T F A, FB, FC, FD, FF F AN COIL HEA T PUMP G O E W2 R Y 24 V AC COM HEA T ST AGE 2 COOL/HEA T ST AGE 1 INDOOR F AN EMERGENCY HEA T O 24 V AC HOT R C W2 Y G R W3 W2 E G RVS COOLING E W2 OTHER HP THERMOST A T ONE OUTDOOR T[...]

  • Page 7

    SEQUENCE OF OPERATION NOTE: Defrost-control board is equipped with 5-minute lockout timer that may be initiated upon any interruption of power. With power supplied to indoor and outdoor units, transformer is energized. Cooling On a call for cooling, thermostat makes circuits R-O, R-Y, and R-G. Circuit R-O energizes reversing valve, switching it to [...]

  • Page 8

    If it is desirable to observe a complete defrost in warmer weather, the thermostat must be closed as follows: 1. Turn off power to outdoor unit. 2. Disconnect outdoor fan motor lead from OF2 on control board. (See Fig. 8.) Tape to prevent grounding. 3. Restart unit in heating mode, allowing frost to accumulate on outdoor coil. 4. After a few minute[...]