ESP Varimax I ASHP, Installation And Operation Manual

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12.2 Simple Faultfinding
The following is a list of some basic faults and solutions.
Failure Possible causes for the
failure
Solutions
Heat pump
cannot
be started
1 Wrong power supply
2 power supply cable loose
3 circuit breaker open
1 shut off the power and check power supply;
2 check power cable and make right connection
3 check for the cause and replace the fuse or circuit
breaker
Water pump is
running with
high noise or
without water
1 lack of water in the piping
2 much air in the water loop
3 water valves closed
4 dirt and block on the water filter
1 check the water supply and charge water to the piping;
2 discharge the air in the water loop;
3 open the valves in water loop;
4 clean the water filter.
Heat pump
capacity is low,
compressor
do not stop
1 lack of refrigerant;
2 bad insulation on water pipe;
3 low heat exchange rate on air side
exchanger;
4 lack of water flow
1 check for the gas leakage and recharge the refrigerant;
2 make good insulation on water pipe;
3 clean the air side heat exchanger;
4 clean the water filter
High
compressor
exhaust
1 too much refrigerant
2 low heat exchange rate on air side
exchanger
1 discharge the redundant gas
2 clean the air side heat exchanger
Low pressure
problem
of the system
1 lack of gas
2 block on filter or capillary
3 lack of water flow
1 check the gas leakage and recharge freon;
2 replace filter or capillary;
3 clean the water filter and discharge the air in water loop.
Compressor do
not run
1 power supply failure
2 compressor contactor broken
3 power cable loose
4 protection on compressor
5 wrong setting on return water temp.
6 lack of water flow
1 check off the power supply;
2 replace compressor contactor;
3 tighten the power cable;
4 check the compressor exhaust temp.;
5 reset the return water temp.;
6 clean the water filter and discharge the air in water loop.
Discharge temp.
Too high
Exhaust
temperature is too
high
Check through each
temp. switch and
return circuit
Freeze alarm
Water flow rate is
inadequate
Check the water flow
volume and flow
switch operation,
Power fault
alarm
Not used in
single phase unit
Outlet temp. too
cold
Water flow rate is
inadequate
Check the water flow
volume, and flow
switch operation
Compressor 2
overcold
Water flow rate is
not enough
Check the water flow
volume and flow
switch operation
EEV alarm
Suction probe
error
The sensor is open
or short circuit
Check or change the
sensor
EEV alarm
Evap. Probe
error
The sensor is open
or short circuit
Check or change the
sensor