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38YSA
Split-System Heat Pump
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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, or other
conditions which may cause death, personal injury, or property
damage. Consult a qualified installer, service agency, or your
di
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3 /8-IN. DIA TIEDOWN NOTE: Avoid contact between tubing and structure KNOCKOUTS IN BASEPAN (2) PLACES OUTDOOR WALL INDOOR WALL CAULK LIQUID TUBE A C L VAPOR TUBE B INSULATION THROUGH THE WALL JOIST 3 8 / ″ 16 VIEW FROM TOP HANGER STRAP (AROUND VAPOR INSULATION TUBE ONLY) VAPOR TUBE A97548 Dimensions (In.) MINIMUM MOUNTING TIEDOWN KNOCKOUT PAD DIMENSIONS LOCATIONS UNIT SIZE Support Snow AB Feet Stand 1″ MIN. 024–042 26 X 32 31 X 35 4 9-3/4 LIQUID TUBE 048 34 X 42 36 X 46 5-5/16 11-13/16 SUSPENSI
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Step 6—Thermostatic Expansion Valve FEEDER TUBE STUB TUBE For proper unit operation and reliability, units must be installed with field-supplied hard shutoff TXV. Do not install with evaporator coils having capillary tube metering devices or pistons. Due to system design, this unit must be installed with a DEFROST factory-listed indoor section. Non-approved coils could cause THERMOSTAT performance and reliability problems. Refer to pre-sale litera- ture for approved indoor sections. A97517 The o
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Table 1—Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters (In.) LIQUID VAPOR VAPOR (LONG LINE) UNIT SIZE Connection Diameter Tube Diameter Connection Diameter Tube Diameter Connection Diameter Tube Diameter 024 3/8 3/8 5/8 5/8 5/8 3/4 030, 036 3/8 3/8 3/4 3/4 3/4 7/8 042, 048 3/8 3/8 7/8 7/8 7/8 7/8 NOTES: 1. Tube diameters are for lengths up to 50 ft. For tubing lengths greater than 50 ft, consult Residential Split System Long-Line Application Guideline. 2. Do not apply ca
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Step 12—Start-Up The unit cabinet must have an uninterrupted or unbroken ground to minimize personal injury if an electrical fault To prevent compressor damage or personal injury, observe should occur. The ground may consist of electrical wire or the following: metal conduit when installed in accordance with existing Do not overcharge system with refrigerant. electrical codes. Failure to follow this warning can result in an Do not operate unit in a vacuum or at negative pressure. electric sh
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CARRIER PROGRAMMABLE ONE CARRIER THERMOSTAT FA, FB, FC, FD, FF, FH HEAT OUTDOOR PROGRAMMABLE FA, FB, FC, MODEL HP FAN COIL PUMP THERMOSTAT THERMOSTAT FD, FF, FH HEAT MODEL HP FAN COIL PUMP W3 R 24 VAC HOT R R R 24 VAC HOT R R INDOOR FAN G G INDOOR FAN G G HEAT STAGE 2 W/W1 * W2 W2 HEAT STAGE 2 W/W1 ODT W2 W2 * COOL/HEAT E Y/Y2 COOL/HEAT STAGE 1 Y/Y2 STAGE 1 * E W3 RVS COOLING O/W2 Y RVS COOLING O/W2 Y NOT USED Y1/W2 O NOT USED Y1/W2 O 24 VAC COM C C C 24 VAC COM C C C NOT USED B NOT USED B
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FA, FB, FC, ONE FA, FB, FC, OTHER FD, FF, FH HEAT OUTDOOR OTHER FD, FF, FH HEAT HP THERMOSTAT FAN COIL PUMP THERMOSTAT HP THERMOSTAT FAN COIL PUMP ODT R W3 R 24 VAC HOT R 24 VAC HOT R R R C C C 24 VAC COM 24 VAC COM C C C * W2 HEAT STAGE 2 W2 HEAT STAGE 2 W2 W2 W2 * E W2 COOL/HEAT COOL/HEAT Y Y STAGE 1 Y STAGE 1 * W3 E G INDOOR FAN INDOOR FAN G Y G G O RVS COOLING RVS COOLING O O O EMERGENCY EMERGENCY E E IF AVAILABLE HEAT * HEAT NOTE: Remove wires from crimp nut in indoor fan coil whe
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CARRIER PROGRAMMABLE FA, FB, FC, FH ONE THERMOSTAT FAN COIL WITH OUTDOOR HEAT MODEL HP SMART HEAT THERMOSTAT PUMP CARRIER R 24 VAC HOT R R PROGRAMMABLE FA, FB, FC, FH THERMOSTAT FAN COIL WITH HEAT MODEL HP SMART HEAT PUMP C G C INDOOR FAN R 24 VAC HOT R R W/W1 Y HEAT STAGE 2 C COOL/HEAT G C INDOOR FAN Y/Y2 G STAGE 1 W/W1 Y O HEAT STAGE 2 RVS COOLING O/W2 O COOL/HEAT W2 Y/Y2 G NOT USED Y1/W2 W2D STAGE 1 CUT O JW1 RVS COOLING O/W2 O 24 VAC COM C W2T ODT W2 NOT USED Y1/W2 W2D NOT USED B W3 Y JW
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FA, FB, FC, FH OTHER FAN COIL HEAT FA, FB, FC, FH HP THERMOSTAT SMART HEAT PUMP OTHER HEAT FAN COIL HP THERMOSTAT PUMP SMART HEAT R R R 24 VAC HOT R 24 VAC HOT R R C 24 VAC COM C C C 24 VAC COM C C COOL/HEAT Y Y STAGE 1 COOL/HEAT Y Y STAGE 1 G G INDOOR FAN G G INDOOR FAN O RVS COOLING O O O RVS COOLING O O EMERGENCY W2 E W2D HEAT EMERGENCY W2 CUT E W2D HEAT JW1 HEAT STAGE 2 W2 W2T JW1 ODT HEAT STAGE 2 W2 W2T W3 W3 Y Y 0 Y Y 0 A97411 A97410 FA, FB, FC, FH OTHER FAN COIL HEAT HP THERMOSTAT S
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CARRIER CARRIER DUAL FUEL TWO-STAGE OR DUAL FUEL THERMOSTAT VARIABLE SPEED THERMOSTAT SINGLE-STAGE MODEL DF FURNACE HEAT PUMP MODEL DF FURNACE HEAT PUMP R R 24 VAC HOT R 24 VAC HOT R R R FAN FAN G G G G FURNACE W/W1 W W2 FURNACE LO W/W1 W/W1 W2 Y Y COMPRESSOR Y/Y2 Y COMPRESSOR Y/Y2 Y/Y2 O RVS COOLING O RVS COOLING O O/W2 O/W2 W2 N/A Y1/W2 FURNACE HI Y1/W2 Y1 C C 24 VAC COM C C 24 VAC COM C C RVS HEATING B RVS HEATING B See note 7 See notes 7 and 8 RVS SENSING L RVS SENSING L S1 OUTDOOR S1 OUTDO
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OF1 OF2 ON 120 30 60 QUIET SHIFT 60 30 90 INTERVAL TIMER OFF P3 DFT T1 Y T2 C C O P1 DFT J1 O R W Y C SPEEDUP 2 providing electrical potential to second heater sequencer (if used). If it is desirable to observe a complete defrost in warmer weather, If outdoor temperature falls below setting of outdoor thermostat the thermostat must be closed as follows: (field-installed option), contacts close to complete circuit and bring 1. Turn off power to outdoor unit. on second bank of supplemen
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Step 14—Final Checks Table 3—Required Liquid-Line Temperature (°F) IMPORTANT: Before leaving job, be sure to do the following: REQUIRED SUBCOOLING LIQUID TEMPERATURE PRESSURE AT 1. Securely fasten all panels and covers. (°F) SERVICE VALVE (PSIG) 5 101520 2. Tighten service valve stem caps to 1/12-turn past finger tight. 134 71 66 61 56 3. Leave User’s Manual with owner. Explain system operation 141 74 69 64 59 and periodic maintenance requirements outlined in manual. 148 77 72 67 62 156 80 75 70
