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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
Improperinstallation,adjustment,alteration,service,maintenance,
or use can cause explosion, fire, electrical shock, or other
conditions which may cause personal injury or property damage.
Consultaqualifiedinstaller,serviceagency,oryourdistributoror
branch for information or assist
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AIR DISCHARGE AIR IN 3 /8" DIA TIEDOWN KNOCKOUTS
(2) PLACES IN BASEPAN NOTES: 1. Allow 30 in. (762 mm) clearance to service end of
unit, 48 in. (1219 mm) above unit, 6 in. (152 mm) on one side, 12 in. (305 mm)
on remaining side, and 24 in. (610 mm) between
units for proper airflow.
AIR IN D 2. Minimum outdoor operating ambient in cooling mode is
C L 55° F (12.8° C) (unless low ambient control is used) max 125° F (51.7° C).
5. Series designation is the
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7. Donotsuspendrefrigeranttubingfromjoistsandstudswitha rigid wire or strap which comes in direct contact with the tubing. (See Fig. 3.) NOTE: Avoid contact between tubing and structure OUTDOOR WALL INDOOR WALL CAULK LIQUID TUBE VAPOR TUBE INSULATION THROUGH THE WALL A93567 Fig. 4—Accessory Support Feet JOIST HANGER STRAP
(AROUND VAPOR
INSULATION TUBE ONLY) VAPOR TUBE COIL SENSING
BULB EQUALIZER
TUBE 1″ MIN. LIQUID TUBE SUSPENSION THERMOSTATIC
A94028 EXPANSION
VALVE → Fig. 3—Piping Install
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NOTE: Install branch circuit disconnect per NEC of adequate INSIDE STRAINER sizetohandleunitstartingcurrent.Locatedisconnectwithinsight FLARE NUT fromandreadilyaccessiblefromunit,perSection440-14ofNEC. ROUTE GROUND AND POWER WIRES—Remove access panel and control box cover to gain access to unit wiring. Extend wires from disconnect through power wiring hole provided and into unit control box. (See Fig. 2.) FLARE ADAPTER CONNECTGROUNDANDPOWERWIRES—Connectground PISTON RETAINER wire to ground conn
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5. SetroomthermostatatHEATorCOOLandfanswitchatON The defrost mode is identical to the cooling mode except the or AUTO, as desired. Operate unit for 15 minutes. Check outdoor fan motor stops and a second-stage heat is turned on to system refrigerant charge. (See Step 10.) continue warming the conditioned space. SEQUENCE OF OPERATION—With power supplied to indoor Step 10—Checking Charge and outdoor units, transformer is energized. Cooling Onacallforcooling,thethermostatmakescircuitsR-O,R-Y,and Don
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TWO-STAGE OR DUAL FUEL SINGLE-SPEED VARIABLE SPEED HEAT PUMP FURNACE THERMOSTAT DUAL FUEL SINGLE-STAGE SINGLE-SPEED 24 VAC HOT R THERMOSTAT R R FURNACE HEAT PUMP G G 24 VAC HOT R R FAN R G W2 G W/W1 W/W1 FAN FURNACE LO Y/Y2 Y/Y2 W/W1 W W2 Y COMPRESSOR FURNACE O Y/Y2 Y RVS COOLING O/W2 Y O COMPRESSOR W2 Y1/W2 FURNACE HI RVS COOLING O/W2 O Y1 Y1/W2 N/A 24 VAC COM C C C 24 VAC COM C C C RVS HEATING B RVS HEATING B SEE NOTES 1 AND 2 L SEE NOTE 1 RVS SENSING L RVS SENSING OUTDOOR S1 OUTDOOR OUTDOOR S
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CORPORATE NON-PROGRAMMABLE THERMOSTAT FK4B HEAT MODEL HP FAN COIL PUMP 24 VAC HOT R R R CORPORATE PROGRAMMABLE 24 VAC COM C C C THERMOSTAT FK4B HEAT MODEL HP PUMP FAN COIL HEAT STAGE 2 W/W1 W2 W2 24 VAC HOT R R R COOL/HEAT Y/Y2 Y/Y2 Y INDOOR FAN G G STAGE 1 HEAT STAGE 2 W/W1 W2 W2 G G INDOOR FAN COOL/HEAT W3 Y/Y2 Y/Y2 Y STAGE 1 O/W2 O O RVS COOLING RVS COOLING O/W2 O O NOT USED Y1 Y1 Y1/W2 W3 NOT USED NOT USED B E C C C 24 VAC COM L L TROUBLE NOT USED B E OPTIONAL S1 L L TROUBLE OUTDOOR S2 SENSO
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NON-CORPORATE NON-PROGRAMMABLE THERMOSTAT FK4B HEAT MODEL HP FAN COIL PUMP NON-CORPORATE 24 VAC HOT R R R NON-PROGRAMMABLE FA, FB, FC, THERMOSTAT FD, FF HEAT 24 VAC COM FAN COIL PUMP C C C MODEL HP 24 VAC HOT R R R HEAT STAGE 2 W W2 W2 C C C 24 VAC COM COOL/HEAT Y Y/Y2 Y STAGE 1 HEAT STAGE 2 W W2 W2 G G INDOOR FAN COOL/HEAT Y Y W3 STAGE 1 O O O RVS COOLING G G INDOOR FAN Y1 O RVS COOLING O EMERGENCY E E EMERGENCY E HEAT HEAT L A95279 A95280 → Fig. 9—Typical 24-v Circuit Connections (continued) W
