CD 30 ÷ 520
42
Low discharge
pressure
(Heating)
Low Temp of cooling water
Refrigerant leak or insufficient
Low suction pressure
Query the Temp of cooling water
Leak hunting or recharging
Refer to “low suction pressure” part
High suction
pressure
(Heating)
High surrounding Temp
Refrigerant over-charged
Measure the surrounding Temp
Discharge the additional
Low suction
pressure
(Heating)
Refrigerant insufficient
Air flow insufficient
Short cycle of air flow
Defrosting insufficient
Recharging
Query the running direction of the fan
Find the reason caused short cycle,
then eliminate it
four-ways value or heat-sensitive
resistance failure, replace them if
necessary
Compressor stop
by anti-freeze
protection
(Cooling)
Chilled-water insufficient
Air enter the water system
failure of the heat-sensitive
resistance
Failure of the water pump or water
flow switch, maintain or replace them
if necessary
Discharge the air
If failure confirmed, replace it.
Compressor stop
by High-pressure
protection
High discharge pressure
High-pressure switch failure
Refer to “high discharge pressure”
If failure confirmed, maintain or
replace it if necessary
Compressor stop
by the overload
protection
High-pressure both of discharge
and suction
High or low voltage, single phase or
unbalance of the phases
short circuit of the motor or
terminals
Over-load component failure
Refer to “high discharge pressure” or
“low suction pressure” parts.
Query the voltage which should
never exceed or below 20V to the
rating.
Query the motor and the
corresponding resistance of the
terminals
Replace it
Compressor
stops by the inner
Temp sensor or
high discharge
High or low voltage
High discharge pressure or low
suction pressure
Components failure
Query the voltage which should
never exceed or below 20V to the
rating.
Refer to “high discharge pressure”
and “low suction pressure” parts.
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