Air Source Heat Pump EAP range user manual - www.ecoairpump.co.uk
2) The low pressure switch is damaged
Vaccumize the system and fill the gas.
B. if the readings are above 0.9Mpa,
probably the 0.02~10.15Mpa low
pressure switch is defected. Replace
the switch.
Ice builds up on
the evaporator
but the system
cannot defrost it
properly.
1) Defrost cut-in temperature is set
incorrectly.
Set the defrost cut-in temperature as
factory default "-2
℃
"
2) The evaporator coil temperature sensor
is placed in the wrong position.
Place the sensor on the second lowest
row of coil on the evaporator
3) The Ohm value of the evaporator coil
temperature sensor changes abnormally;
the sensor is damaged.
Replace the sensor
4) The defrost check valve or the defrost
capillary is blocked.
Replace check valve or capillary
5) The unit cycles on and off too often.
Hence the defrost delay time (P1)
condition is not satisfied.
Replace with a smaller heat pump;
Install a bigger buffer water tank in the
house heating system; increase set
water temperature difference (PA)
value.
Water
temperature
rises too slowly
1) The heat pump is undersized.
Size the correct model
2) The water tank is poorly insulated.
Insulate the water tank/pool properly
3) Water pipes are poorly insulated.
Insulate the water pipe properly
4) Mains water supply is unreasonable.
Redesign the mains water supply
5) The space between inlet water pipe and
outlet water pipe is too narrow, resulting in
water shortcircuit.
The space between inlet and outlet
water pipes should be no less than 1m
6) The heat pump is installed in a place
where the ventilation is not good.
Improve the ventilation
7) Insufficient refrigerant inside the
system.
Check where the leakage is and fill
refrigerant
Water pump and
fan motor is
running, but the
compressor
does not start
1) The phase sequence board in the
electrical box activates fault-phase or
lack-phase protection
Check if there is a lack-phase and put
the phase wire in the right position
2) Phase sequence board is damaged
Replace the phase sequence board
Heat pump does
not start properly
1) No power input
Plug in the power cord
2) Power voltage is not correct
Start the heat pump under the right
voltage
3) Power voltage drops when the unit is
started. The unit draws a huge current.
Low power capacity in the network;
Wires in wrong diameter (too small)
are used.
4) Fault-phase or lack-phase problem with
the mains power supply.
Put the phase wires in the right position
5) Poor contact problem with the wiring in
the system.
Improve the contact
6) The heat pump is in clock timer
shutdown state.
Check the clock timer settings. Reset
or cancel it.
