Installation guide

ManualsBrandsTappan ManualsAir CompressorsFT4BG

Split System Heat Pump

FT4BG & PSH4BG Series 18 SEER

The 18 SEER, iQ Drive

split heat pump operates as part of a larger system which can provide temperature, air ﬂow, and

humidity control for a residence or other similarly sized building. This system includes this outdoor unit and a compatible

indoor unit, typically an air handler with electric strip heat or a gas furnace. The electric or gas heat may serve as backup

or auxiliary heat to supplement the heat pump, which is expected to serve as the primary heating means. However, electric

or gas heat is not required for this system to operate. Accessory equipment which may be used with the system includes

humidiﬁers, electric or electronic air cleaners, and U/V (ultraviolet) sterilizing lamps.

Refer to the System Operation section within this document for a description of how the heat pump operates. In addition,

information for troubleshooting and diagnosing problems is included.

Summary of content (20 pages)

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FT4BG & PSH4BG Series 18 SEER INSTALLATION INSTRUCTIONS Split System Heat Pump The 18 SEER, iQ Drive® split heat pump operates as part of a larger system which can provide temperature, air flow, and humidity control for a residence or other similarly sized building. This system includes this outdoor unit and a compatible indoor unit, typically an air handler with electric strip heat or a gas furnace.
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IMPORTANT SAFETY INFORMATION INSTALLER: Please read all instructions before servicing this equipment. Pay attention to all safety warnings and any other special notes highlighted in the manual. Safety markings are used frequently throughout this manual to designate a degree or level of seriousness and should not be ignored. WARNING indicates a potentially hazardous situation that if not avoided, could result in personal injury or death.
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PREPARATION Slab Mounting Before proceeding with installation of iQ heat pump equipment, consult with the distributor and homeowner to confirm that the equipment listed on the order is what was ordered, and that it matches labeling on the equipment packaging. Determine (including consultation with the homeowner) the intended/preferred location for placement of the compressor/ outdoor coil unit. Unit envelope dimensions are shown in Figure 1. This heat pump is designed for outdoor installation only.
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ELECTRICAL CONNECTIONS WARNING: ELECTRICAL SHOCK HAZARD Failure to follow safety warnings exactly could result in serious injury or property damage. Improper servicing could result in dangerous operation, serious injury, death or property damage. • Before servicing, disconnect all electrical power to the unit. • When servicing controls, label all wires prior to disconnecting. Reconnect wires correctly. • Verify proper operation after servicing.
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Table 3 below for the proper size of field supplied lines. The maximum allowable refrigerant line length is 100 ft. The maximum vertical elevation between the heat pump and indoor coil is 50 ft. Systems that require more elevation will need to have an oil trap installed in the vapor line. Refer to Nordyne Application Guideline for Refrigerant Lines Over 75 Feet (document 044B-0600) for piping details. A filter drier is supplied with the heat pump.
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ambient temperature is below 60° F), with both Y1 and Y2 outputs energized. This may be accomplished by setting the thermostat to cool with a setpoint substantially lower than room temperature. This will provide 45 minutes of operation at the nominal rating speed (interface board display “C4” or “H4”) before there is a speed change (to a higher speed). If this speed change occurs before the charging process is complete, turn the system off, turn control power off and on again, and then restart the process.
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potentially confusing fault codes, which will continue to be displayed as part of fault history when the unit is subsequently operating normally. Run Sequence After power-up and between cycles (after the preceding shutdown) there will always be a five minute compressor (re)start delay imposed. With a call for heat pump heating or cooling and before the compressor is turned on, the outdoor fan will run for one minute to assure that the outdoor temperature measurement is close to that of the ambient air.
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the outdoor ambient at that time. If this has not occurred by 6 hours of operation (with the coil below 35°), a defrost will be run regardless. Following each defrost sequence, the unfrosted air-to-coil temperature difference is rechecked, and that value is used to determine the next defrost trigger temperature. In this way the effect of frosting up is always compared to the unfrosted performance of the coil in its current condition.
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TROUBLESHOOTING The 2-character LED display on the inverter control board is intended to be helpful in diagnosing problems. Under normal operation the display will always show both a status indicator (Table 5) along with fault indications (Table 6). The fault indications are a sequential listing of fault history. The last 10 fault codes recorded are displayed in sequence, with the most recent first.
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 10 Low DC Bus Voltage – In most cases this is an indication that 208/230 volt line power was interrupted or disconnected. It may also indicate low line voltage or, rarely, an internal inverter failure.  Low AC Line Voltage – This indicates that line voltage has dropped below approximately 170 volts. It may also indicate loss of line power, in which case Code  may appear in addition to or instead of this code.
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FIGURES & CHARTS Inverter (black plastic case) } Interface Board Contactor } Low Voltage Compartment Figure 2.
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Contactor Ground Lug Wire Entry Figure 3. Power Wiring Terminals Figure 4. Low Voltage Compartment for Control Wiring Vapor Line Service Valve Liquid Line Service Valve Figure 5.
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Cooling Charging Chart (Outdoor Temperature above 60° F) Liquid Line Pressure (psig) 500 Remove refrigerant if above the curve. 450 400 350 300 250 Add refrigerant if below the curve. 200 60 70 80 90 100 110 120 Liquid Line Temperature (° F) Heating Charging Chart (Outdoor Temperature below 60° F, Indoor Temperature 75° F) Liquid Line Pressure (psig) 450 5 TON Remove refrigerant if above the curve. 4 TON 400 3 TON 2 TON 350 300 Add refrigerant if below the curve.
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2-Character Display Defrost Termination Selection Figure 7.
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Figure 8.
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Figure 9.
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Temperature vs. Resistance for All Thermistors (Part 1) 170 160 150 Deg F 140 130 120 110 100 90 80 70 1 2 3 4 5 6 7 8 9 10 kΩ Temperature vs. Resistance for All Thermistors (Part 2) 80 70 60 Deg F 50 40 30 20 10 0 -10 10 20 30 40 50 60 70 80 90 100 kΩ Figure 10.
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INSTALLATION CHECKLIST ELECTRICAL SYSTEM ATTENTION INSTALLERS: It is your responsibility to know this product better than your customer. This includes being able to install the product according to strict safety guidelines and instructing the customer on how to operate and maintain the equipment for the life of the product. Safety should always be the deciding factor when installing this product and using common sense plays an important role as well.