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38BYC, 38BYG
12 SEER Split System
Heat Pump
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Installation and Start-Up Instructions
NOTE: Read the entire instruction manual before starting the
installation.
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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 age
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NOTE: Avoid contact between tubing and structure OUTDOOR WALL INDOOR WALL CAULK LIQUID TUBE C VAPOR TUBE INSULATION THROUGH THE WALL JOIST HANGER STRAP (AROUND VAPOR INSULATION TUBE ONLY) VAPOR TUBE 3 ⁄ ″D. (9.53) TIEDOWN 8 KNOCKOUTS (2) PLACES A B A94199 1″ MIN. Dimensions (In.) LIQUID TUBE SUSPENSION MINIMUM TIEDOWN KNOCKOUT LOCATIONS UNIT MOUNTING-PAD SIZE AB C DIMENSIONS A94028 018-024 22-1/2 X 22-1/2 3-11/16 18-1/8 14-3/8 Fig. 2—Connecting Tubing Installation 030-060 30 X 30 6-1/2 23-1/2 2
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If TXV installation is required, remove existing AccuRater® from feeder tubes, there is a 3/8-in. O.D. stub tube approximately 2 in. indoor coil. Refer to Figs. 4 and 5 and install TXV kit as follows: long. (See Fig. 6.) The defrost thermostat should be located on stub tube. Note that there is only 1 stub tube used with liquid header, 1. Install suction tube adapter. and on most units it is the bottom circuit. 2. Install liquid flare-to-sweat adapter. FEEDER TUBE 3. Connect external equalizer tu
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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 018 3/8 3/8 5/8 5/8 5/8 3/4 024 3/8 3/8 3/4 3/4 3/4 3/4 030, 036 3/8 3/8 3/4 3/4 3/4 7/8 042 3/8 3/8 7/8 7/8 7/8 1-1/8 048, 060 3/8 3/8 7/8 1-1/8 7/8 1-1/8 NOTES: 1. Tube diameters are for lengths up to 50 ft. For tubing lengths greater than 50 ft horizontal, or greater
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Table 2—Accessory Usage REQUIRED FOR REQUIRED FOR REQUIRED FOR LOW-AMBIENT LONG-LINE BURIED LINE ACCESSORY APPLICATIONS APPLICATIONS* APPLICATIONS† (BELOW 55°F) (OVER 50 FT) (OVER 3 FT) Crankcase Heater Yes Yes Yes Evaporator Freeze Thermostat Yes No No Accumulator No No Yes Compressor Start-Assist Yes Yes Yes Capacitor and Relay MotorMaster® Control, or Yes No No Low-Ambient Pressure Switch See low-ambient Wind Baffle No No Instructions Unit Risers Recommended No No Liquid-Line Solenoid Valve S
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4. Set room thermostat to desired temperature. Be sure set point outdoor temperature falls below setting of outdoor thermostat is below indoor-ambient temperature. (field-installed option), contacts close to complete circuit and bring on second bank of supplemental electric heat. 5. Set room thermostat to HEAT or COOL and fan control to ON or AUTO mode, as desired. Operate unit for 15 minutes. When thermostat is satisfied, its contacts open, de-energizing Check system-refrigerant charge. contact
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EXAMPLE: To calculate additional charge required for a 25–ft line set: OF2 25 ft – 15 ft = 10 ft X 0.6 oz/ft=6ozof additional charge OF1 Units installed with cooling mode TXV require charging with the subcooling method. 1. Operate unit a minimum of 10 minutes before checking charge. 2. Measure liquid service-valve pressure by attaching an accurate gage to service port. 3. Measure liquid-line temperature by attaching an accurate thermistor type or electronic thermometer to liquid line near outdoo
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NOTE: When charging is necessary during heating season, 3. Leave User’s Manual with owner. Explain system operation charge must be weighed in accordance with unit rating plate ± 0.6 and periodic maintenance requirements outlined in manual. oz/ft of 3/8-in. liquid line above or below 15 ft respectively. 4. Fill out Dealer Installation Checklist and place in customer EXAMPLE: file. To calculate additional charge required for a 25–ft line set: CARE AND MAINTENANCE 25 ft – 15 ft = 10 ft X 0.6 oz/ft=
