CHA
30
PROBLEM
POSSIBLE REASONS
RECOMMENDED ACTION
VI.
THE FANS DON‘T
START
1. Fan contactor is not energised
2. The fan thermal cut-outs trip (+)
3. The connections are faulty
4. The fan motor is faulty
1. Check the voltage at the ends of the contactor coil and
the continuity of the coil. Replace if faulty.
2. Inspect the insulation between the windings and between
the windings and the earth.
3. Check and tighten.
4. Check and replace if necessary.
VII.
LACK OF
REFRIGERANT
LIQUID
1. There‘s a leak in the refrigerant circuit
1. After pressurising the circuit at about 10 bar, check with
a leak tester. Repair, depressurise and fill with refrigerant
liquid.
VIII.
THE FLUID PIPE IS
HOT
1. There‘s not enough refrigerant liquid in the circuit
1. See previous point (VII).
IX.
THE FLUID PIPE IS
COVERED WITH
FROST
1. The liquid shut-off valve is partially closed
2. The fluid filter is clogged
1. Open the valve completely.
2. Replace the filter cartridge or the filter (depending on the
model).
X.
THE UNIT CON-
TINUES TO WORK
WITHOUT STOP-
PING
1. Lack of refrigerant gas
2. Compressor not performing as expected
3. The heat load is excessive
4. The thermostat is badly adjusted or broken
5. The liquid filter is clogged
1. See point VII.
2. Inspect and replace or overhaul.
3. Reduce the heat load.
4. Check the thermostat set-point and replace the
thermostat if necessary.
5. Replace.
XI.
THE UNIT WORKS
REGULARLY BUT
HAS AN INSUFFI-
CIENT OUTPUT
1. There isn‘t enough refrigerant liquid
2. Moisture in the refrigerant circuit
1. See point VII.
2. Empty the cooling circuit, dry it, replace the filter - do the
charge again
XII.
THE COMPRESSOR
SUCTION LINE IS
COVERED WITH
FROST
1. The thermostatic expansion valve doesn‘t work properly
2. There isn‘t enough refrigerant liquid
3. The liquid shut-off valve is partially closed
4. The filter on the liquid line is clogged
5. The water circulation pump is faulty *
1. Check, clean and replace if necessary.
2. See point VII.
3. Check and open it completely if necessary.
4. Clean or replace.
5. Inspect the pump and replace it if necessary.
XIII.
THE DEFROSTING
CYCLE IS NEVER
ACTUATED
1. The 4-way inversion valve is not energised**
2. The defrosting thermostat set-point is incorrect or the
probe is faulty **
1. Check valve coils. Replace the inversion valve if necessary.
2. Change the set-point or replace the probe if necessary.
XIV.
ABNORMAL NOISE
IN THE SYSTEM
1. The compressor is noisy
2. The thermostatic valve is noisy
3. There are vibrations in the piping
4. The panels vibrate
1. Check and replace if necessary.
2. Check and add refrigerant liquid.
3. Fix the pipes with brackets.
4. Install correctly.
