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INSTALLATION AND MAINTENANCE INSTRUCTIONS
4HP16LT Series
Split System Heat Pump
Save these instructions for future reference
WARNING
The equipment covered in this manual is to be installed by trained and experienced service
and installation technicians. Improper installation, modification, service, or use can cause
electrical shock, fire, explosion, or other conditions which may cause personal injury, death,
or property damage. Use appropriate safety gear including safety glasses and gloves whe
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on the carrier’s freight bill. Take special care to examine INSTALLATION the unit inside the carton if the carton is damaged. Any General concealed damage discovered should be reported to the last carrier immediately, preferably in writing, and should Read this entire instruction manual, as well as the include a request for inspection by the carrier’s agent. instructions supplied in separate equipment, before starting the installation. Observe and follow all warn- If any damages are discovered a
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NOTE: Elevation of the unit may be accomplished by Refer to the furnace or blower coil Installation Instructions constructing a frame using suitable materials. If a for additional wiring application diagrams and refer to unit support frame is constructed, it must not block drain rating plate for minimum circuit ampacity and maximum holes in unit base. overcurrent protection size. • When installed in areas where low ambient tempera- 1. Install line voltage power supply to unit from a properly tur
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Field refrigerant piping consists of liquid and suction lines Thermostat Designations from the outdoor unit (sweat connections) to the indoor coil (Some connections may not apply. Refer to specific thermostat and indoor unit.) (flare or sweat connections). Without Auxiliary Heat Select line set diameters from Table 2 to ensure that oil returns to the compressor. Size vertical suction riser to maintain minimum velocity at minimum capacity. Recommended line length is 50’ or less. If more than 5
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Line Set Isolation WARNING Illustrations on pages 6 and 7 demonstrate procedures Polyol ester (POE) oils used with R410A which ensure proper refrigerant line set isolation. Figure 5 refrigerant absorb moisture very quickly. It is shows how to install line sets on horizontal runs. Figure 6 shows how to make a transition from horizontal to vertical. very important that the refrigerant system be Figure 7 shows how to install line sets on vertical runs. kept closed as much as possible. DO NOT remo
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Refrigerant Line Sets: Installing Horizontal Runs To hang line set from joist or rafter, use either metal strapping material Wire Tie or anchored heavy nylon wire ties. (around vapor line only) 8’ Strapping Material Floor Joist or (around vapor line only) Roof Rafter Tape or Wire Tie 8’ Strap the vapor line to the joist or rafter at 8’ intervals then strap the liquid line to the vapor line. Metal Sleeve Floor Joist or Roof Rafter Tape or Wire Tie Figure 5 Refrigerant Line Sets: Transition from
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Refrigerant Line Sets: Installing Vertical Runs (new construction shown) IMPORTANT: Refrigerant lines must not contact wall. Outside Wall Vapor Line Liquid Line NOTE: Similar installation practices should be used if line set is to be Wood Block installed on exterior of outside wall. Between Studs Wire Tie Inside Wall Strap Sleeve Vapor Line Wrapped with Armaflex Wire Tie Liquid Line Outside Wall Wood Block IMPORTANT: Refrigerant Wire Tie lines must not contact structure. Strap Caulk Fiberglass P
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Flushing Connections Note: The inverted R22 cylinder must contain at least the same amount of refrigerant as was recovered from the existing system. Figure 8 If the existing outdoor unit is equipped with manual are not approved for use with R410A refrigerant and shutoff valves AND new R22 refrigerant will be used may prevent proper flushing. Use a field-provided to flush the system: fitting to reconnect the lines. Start the existing R22 refrigerant system in cooling mode 5. Remove the pressure t
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removed during the first flush. After each system flush, allow the recovery machine to pull a vacuum on the system at the end of the procedure. 9. Close the valve on the inverted R22 cylinder and the gauge set valves. Pump the remaining refrigeraant out of the recovery machine and turn the machine off. 10. Use nitrogen to break the vacuum on the refrigerant lines and indoor coil before removing the recovery machine, gauges, and R22 refrigerant drum. Re-install pressure tap valve cores into
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Service Valve Ball Type Service Valve (Valve Open) Valve Closed Stem Cap Service Port Insert hex To outdoor coil wrench here Service Port Cap To indoor coil Schrader valve open (valve front seated) to line set when valve is closed (front seated) Insert hex Stem Cap wrench here Service Port Use adjustable wrench. To open, rotate stem counterclockwise 1/4 turn (90°). To close, rotate To outdoor coil stem clockwise 1/4 turn (90°). Figure 11 To indoor coil Service Port Cap The ball valve is equipped
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to protect the manifold gauge set from damage • Low pressure gauge to suction line service valve caused by high pressure.) • High pressure gauge to liquid line service valve 2. With both manifold valves closed, connect the cylin- 2. Connect micron gauge. der of R410A refrigerant. Open the valve on the R410A cylinder (vapor only). 3. Connect the vacuum pump (with vacuum gauge) to the center port of the manifold gauge set. 3. Open the high pressure side of the manifold to allow R410A into the line
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Units are factory charged with the amount of R410A START-UP refrigerant indicated on the unit rating plate. This charge is based on a matching indoor coil and outdoor coil with 15’ CAUTION line set. For varying lengths of line set, refer to Table 4 for refrigerant charge adjustment. A blank space is provided If unit is equipped with a crankcase heater, it should be on the unit rating plate to list the actual field charge. energized 24 hours before unit start-up to prevent compressor damage
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Cooling Cycle OUTDOOR UNIT DEFROST THERMOSTAT DISTRIBUTOR NOTE - ARROWS INDICATE DIRECTION OF REFRIGERANT FLOW REVERSING VALVE EXPANSION/CHECK VALVE OUTDOOR COIL BIFLOW LOW HIGH INDOOR UNIT FILTER / DRIER PRESSURE PRESSURE MUFFLER GAUGE MANIFOLD SUCTION SUCTION SERVICE TO LIQUID LINE PORT R410A LINE VALVE COMPRESSOR DRUM SERVICE PORT INDOOR EXPANSION/CHECK VALVE COIL Use gauge ports on suction line valve and liquid line valve for evacuating refrigerant lines and indoor coil. Use suction gauge po
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Blocking Outdoor Coil R410A Temperature/Pressure Chart Outdoor coil should be Temp. Pressure Temp. Pressure Temp. Pressure EF Psig EF Psig EF Psig blocked one side at a time with cardboard or plastic 32 100.8 74 214.0 116 396.0 sheet until proper testing 33 102.9 75 217.4 117 401.3 pressures are reached. 34 105.0 76 220.9 118 406.7 35 107.1 77 224.4 119 412.2 36 109.2 78 228.0 120 417.7 37 111.4 79 231.6 121 423.2 CARDBOARD OR PLASTIC SHEET 38 113.6 80 235.3 122 428.8 39 115.8 81 239.0
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Normal Operating Pressures Heating & Cooling Cooling Indoor: 80 db; 67 wb Heating (indoor): 70°F ± 2 psi L - Liquid S- Suction Values provided above are for HSV match pressures; different indoor unit match, and indoor load will cause pressures to vary. Table 7 system is undercharged. Verify adjusted charge using the due to differences in installations. Significant approach method. differences could mean that the system is not properly charged or that a problem exists with some 4. Use the sa
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Check Charge Using Normal Operating Pressures 5. Subtract the outdoor ambient temperature from the liquid line temperture to determine the approach temperature. Use Table 7 to perform maintenance checks. Table 7 is not a procedure for charging the system. Minor variations in ° Liquid Line Temperature °F these pressures may be due to differences in installations. _ ° Outdoor Ambient Temperature °F Significant deviations could mean that the system is not = properly charged or that a problem ex
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NOTE - The demand defrost board accurately OPERATION measures the performance of the system as frost accumulates on the outdoor coil. This typically will Outdoor unit and indoor blower cycle on demand from the translate into longer running time between defrost room thermostat. When the thermostat blower switch is cycles as more frost accumulates on the outdoor coil moved to the ON position, the indoor blower operates before the board initiates defrost cycles. continuously. Filter Drier DIAGNOST
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DEFROST BOARD PRESSURE SWITCH Sensor Temp. / Resistance Range CONNECTIONS Temperature Pins/Wire Red Led (DS1) The unit’s automatic reset pressure switches (LO PS - Sensor Range °F (°C) Color S87 and HI PS - S4) are factory-wired into the defrost Outdoor -35 (-37 to 120 3 & 4 board on the LO-PS and HI-PS terminals, respectively. 280,000 to 3750 (Ambient) (48) (Black) 5 & 6 -35 (-37) to 120 Coil 280,000 to 3750 (48) (Brown) (OPTIONAL) Low Pressure Switch (LO-PS) — When the low pressure switch trip
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Defrost Temperature Termination Shunt (Jumper) Actuation—When the reversing valve is de-energized, Pins—The defrost board selections are: 50, 70, 90, and the Y1 circuit is energized, and the coil temperature is 100°F (10, 21, 32 and 38°C). The shunt termination pin is below 35°F (2°C), the board logs the compressor run factory set at 50°F (10°C). If the temperature shunt is not time. If the board is not calibrated, a defrost cycle will be installed, the default termination temperature is 90°F
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506468-01 Issue 1004 Page 20
