Carrier 38YRA manual

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Table of contents for the manual

  • Page 1

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

  • Page 2

    Install TXV kit to indoor coil as follows: 1. Install suction tube adapter. 2. Install liquid flare-to-sweat adapter. 3. Install TXV on liquid flare-to-sweat adapter. 4. Connect external equalizer tube to fitting on suction tube adapter. 5. Position sensing bulb on horizontal portion of suction tube adapter. Secure using supplied hardware. Insulate[...]

  • Page 3

    7. Do not suspend refrigerant tubing from joists and studs with a rigid wire or strap which comes in direct contact with the tubing. (See Fig. 3.) 8. Ensure that tubing insulation is pliable and completely sur- rounds the vapor tube. 9. When necessary, use hanger straps which are 1 in. wide and conform to the shape of the tubing insulation. (See Fi[...]

  • Page 4

    A brazing shield MUST be used when tubing sets are being brazed to the service valves to prevent damage to the painted unit surface. 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. Do not ve[...]

  • Page 5

    5. Set room thermostat at HEAT or COOL and fan switch at ON or AUTO, as desired. Operate unit for 15 minutes. Check system refrigerant charge. (See Step 10.) SEQUENCE OF OPERATION — With power supplied to indoor and outdoor units, transformer is energized. Cooling On a call for cooling, the thermostat makes circuits R-O, R-Y, and R-G. Circuit R-O[...]

  • Page 6

    → Fig. 9—Typical 24-v Circuit Connections A94390 FAN COIL Y/Y2 W/W1 C R 24 VAC HO T 24 VAC CO M HEAT STAGE 2 COOL/HEAT STAGE 1 INDOOR FAN CORPORATE NON-PROGRAMMABLE THERMOSTAT MODEL HP HEAT PUMP RVS COOLING NOT USED NOT USED TROUBLE OPTIONAL OUTDOOR SENSOR CONNECTION S2 S1 B Y1 R C W2 G G Y O/W2 O W2 R C L FA, FB, FC, FD, FF A95215 Y/Y2 W/W1 R [...]

  • Page 7

    → Fig. 9—Typical 24-v Circuit Connections (continued) A95330 FAN COIL Y/Y2 W/W1 C R 24 VAC HO T 24 VAC CO M HEAT STAGE 2 COOL/HEAT STAGE 1 INDOOR FAN CORPORATE NON-PROGRAMMABLE THERMOSTAT MODEL HP HEAT PUMP RVS COOLING NOT USED NOT USED TROUBLE OPTIONAL OUTDOOR SENSOR CONNECTION S2 S1 B Y1 W2 G R L FK4C R W1 Y Y/Y2 G W2 C C O/W2 O O Y1 A94392 F[...]

  • Page 8

    WIRING DIAGRAM NOTES: 1. Underlined letter on dual terminal indicates its usage. Outdoor Temperature Sensor must be attached in all dual fuel installations. Jumper wire between O/W2 and L thermostst terminals MUST be present. 2. Y1 and O connections to 2-stage furnaces MAY NOT EXIST, or may be only a wire rather than a screw terminal. 3. Corporate [...]