Dulas Solar VC150, Handbook

Page: 95 / 156

95
D.11. COOLING CIRCUIT FAULT
SYMPTOMS OF THE FAULT
The refrigerator is too warm and the compressor is a not run continuously or very
frequently.
How to confirm this fault
1. If the compressor runs and the evaporator plate do not get cold all over then:
(a) The cooling circuit may be undercharged with refrigerant, or
(b) The capillary tube blocked, or
(c) There may be moisture in the system
2. If the refrigerator is correctly charged with refrigerant, there must be liquid in the
pipe coming out of the condenser. To check this, do the following:
(a) Adjust the thermostat to its coldest setting and run the compressor for at least
five minutes.
(b) With the compressor running, hold a lighted match under the condenser outlet
pipe until the match is finished.
(c) As soon as the match has gone out put your finger on the pipe here the match
heater it.
(d) The pipe should be warm only. The liquid in the pipe will absorb if there is
liquid inside the pipe the heat form the match. If the pipe is too hot for you to keep
your fingers on it, then there is no liquid in the pipe. These mean that the refrigerator
is not adequately charged with refrigerant.
Repair action required
IF YOU ARE SURE THAT the symptoms indicate that there is insufficient refrigerant
in the refrigerator or there may be problem with moisture or a blockage, then REFER
TO THE TECHNICIANS HANDBOOK FOR COMPRESSION REFRIGERATORS,
PART B, FAULTS AND FAULTS FINDING. Page 7 gives a faultfinding chart and
procedure to find and replace the fault.