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Calorex Heat Pumps Ltd. · The Causeway, Maldon, Essex CM9 4XD, UK · Tel: +44 (0)1621 857 171
Installation Manual
PPT8/12/16/22L/LY
R
Outdoor swimming pool heat pump troubleshooting checklist
1. Warning Lights
Check the status of the warning lights. For correct operation the red mains
light should be illuminated, green water flow light should be illuminated,
except under cold ambient conditions the white defrost light should be
extinguished and the amber fault light should be extinguished.
Mains Light
If the mains light is off there is no power to the unit. This light is wired
directly across the incoming electrical supply and therefore only
illuminates when the incoming supply is healthy.
Water flow light
If the green water flow light is not illuminated check that there is adequate
water flow through the heat pump by checking that there are no by pass or
isolating valves incorrectly positioned and that the sand filter does not
require backwashing.
Defrost light
If the white defrost light is illuminated check that the evaporator coil is
clean. If dirty, clean with a soft brush. Greasy debris can be removed with
a mild chemical cleaner and pressure washer. Also check that the heat
pump is installed in a free space that will not allow exhausted cold air to
re-circulate back into the heat pump. This can be checked by measuring
the air temperature at the point where it enters the heat pump and
comparing this to the actual ambient air temperature. They should be the
same. If the temperature of the air entering the heat pump is lower,
recirculation is occurring. This will cause premature defrosting and poor
performance.
Note:
In air temperatures below 15 automatic defrosting may occur as part of the
heat pumps normal operation.
Fault light
This will illuminate if,
a)
The heat pump is wired with external controls across its interlock
and these controls are open circuit. These controls would normally be an
external time clock or volt free terminals on the filter pump contactor and
would be wired across the terminals shown as “interlock” on the incoming
customer interface within the heat pump.
b)
The heat pump has lost its gas.
This can be checked by measuring continuity across the low pressure
switch (see manual for details of pressure switch position). If the heat
pump has lost it’s gas a specialist refrigeration technician should
investigate further.
