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10
Controls & Indicator Lamps
(Analog Models)
Your analog heat pump pool heater incorporates safe-
ty controls and indicators to ensure its safe, reliable
operation (for models with digital controls, see page
11).
Water Pressure Switch: Prevents operation when the
pump is OFF. The unit requires 5 psi minimum pres-
sure.
Water Temperature Control: Pool/spa water temper-
ature is controlled by the heat pump pool heater
thermostat on the unit control panel, which contains a
switch and 2 thermostats, one for setting a heat spa
temperature and the other for a swimming pool tem-
perature. The switch can operate an optional external
control system, or can switch between thermostats for
pool or spa.
Defrost Switch: Prevents heat pump pool heater
operation if ambient air temperature falls below a pre-
determined safe minimum (approximately 42° F).
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.
Refrigerant Low Pressure Control: Stops the com-
pressor if refrigerant suction (low side) pressure falls
too low as a result of a malfunction, loss of charge or
extreme cold conditions.
Indicator Lamps: There are 6 indicator lamps located
on the unit control panel (see Fig. 3 below):
• Power (amber lamp): When lit, indicates power is
applied to the unit.
• Water Flow (green lamp): When lit, indicates nor-
mal water flow.
• Heat Demand (green lamp): When lit, indicates
the actual water temperature is below the target
water temperature.
WARNING: Install a check valve and/or a Hartford
loop AFTER the heat pump pool heater and
BEFORE any chlorinating devices. Install any auto-
matic chemical feeders AFTER the heat pump pool
heater. Improper installation of any type of auto-
matic 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.
NOTE: The heat pump pool heater will not run when
the Remote position is selected on the Pool/Spa
selector switch and there is no remote control sys-
tem attached.
Fig. 3: Indicator Lamps — Analog Models
NOTE: The heat pump pool heater will not run when
the Remote position is selected on the Pool/Spa
selector switch and there is no remote control sys-
tem attached.