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Always satisfy applicable codes and standards. • In sizing power wiring, be especially aware of up- sizing requirements necessary due to wiring distances. Always satisfy applicable codes and standards. • Electrical installation should be done by a licensed electrician only. This unit is pre-wired to work with external control systems, heat-on-demand options and other external time clock overrides. Refer to the external control system’s instructions, and page 19 of this manual, for installation information. 6 WATERINWATEROUT Fig. 2: Water Connections Water Connections CAUTION: The heat pump pool heater inlet and outlet connections are NOT interchangeable. They must be connected as instructed below. 1. Connect the heat pump pool heater in the return water line between the filter and the pool/spa. See the Plumbing Diagrams beginning on page 12. 2. Connect the filter outlet to the fitting marked WATER IN at the bottom front of the unit. 3. Connect the fitting marked WATER OUT to the return piping to the pool/spa. Unit inlet/outlet connection fittings are 2-inch PVC unions. Water connections from the unit to the main return line can be PVC pipe or flexible pipe approved for the purpose and, in either case, should be at least equal in size to the main pool/spa circulation piping. 4. In cold weather (freeze zone) areas, shutoff valves (ball or gate type) must be installed at the unit inlet and outlet to facilitate service and cold weather drain-down. 5. Operate the pump and check the system for leaks. WARNING: Install a check valve and/or a Hartford loop AFTER the heat pump pool heater and BEFORE any chlorinating devices. Install any automatic chemical feeders AFTER the heat pump pool heater. Improper installation of any type of automatic chemical feeders can result in serious damage to, or premature failure of, the heat pump pool heater and will void the heat pump pool heater warranty. Controls Your heat pump pool heater incorporates digital safety controls and indicators to ensure its safe, reliable operation. Water Pressure Switch: Prevents operation when the pump is OFF. The unit requires 5 psi (0.73 kPa) minimum pressure. Digital Water Temperature Control: The pool water temperature is controlled by the heat pump pool heater’s digital control system, which gives you the option of two settings: one for the desired spa temperature and the other for the desired pool temperature. Additionally, as mentioned earlier, the unit is compatible with most ‘2-wire’ and ‘3-wire’ control/automation systems. Fig.3:DigitalWaterTemperatureControl 7 Defrost Sensor: Prevents unit operation if ambient air temperature falls below a predetermined safe minimum (approximately 42°–48°F, based on humidity). The compressor will shut OFF but the fan will continue to run. Delay Timer: Prevents compressor from short cycling, which could damage or destroy the hermetic motor/compressor. Upon water temperature control satisfaction, or other circuit interruptions, this solid state device will prevent compressor restart for approximately 5 minutes. Controls Operating Instructions The electronic board has the capability of memorizing two different programmed temperature settings as follows (refer to Fig. 3): • For a pool, maximum 95°F (35°C) • For a spa, maximum 104°F (40°C) To Select Pool or Spa Mode To have access to...

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