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Section B
10 - 1
Air Conditioning
The system will not function in very low ambient temperatures, therefore tests should be carried out in a warm environment.
It is recommended that, to locate faults on the system accurately and quickly, an electronic leak detector and a refrigerant
pressure gauge should be used. However, leaks can be detected on the system by using soapy water applied to the
suspected leak area and system pressure can be assessed by the state of refrigerant passing through the receiver drier sight
glass. Following sections of the manual deal with the major components of the air conditioning systems and give further fault
finding and maintenance information.
General Fault Indications
There are several indications that may help to determine the fault area on a system not working efficiently:
a)
Poor performance.
b)
Warm or slightly cool air
emitted from unit.
c)
Blower operates on fan
speed 3 only.
Blower does not operate.
d)
Compressor clutch
continually cuts out.
Sight Glass Indications
An approximate indication of the condition of the refrigerant can be seen through the receiver/drier sight glass when the
compressor is running. Refer also to Service Procedures - Checking Refrigerant Charge Level.
Clear - No fault indicated unless the system is unable to provide cool air. The indication then is
that the system is completely discharged of refrigerant.
Foam or bubbles - Refrigerant low and in need of charging.
Clouded - Dessicant breakdown in the receiver-drier.
S201520
Note: Sight glass indications cannot always give a positive identification of a problem. Further diagnosis, preferably by a
refrigeration engineer using pressure gauges, is advisable before reaching a definite conclusion.
9803/3280
Body & Framework
Fault Finding
Low system pressure -
Condenser matrix air flow restricted -
Air filter blocked -
Compressor drive belt too slack -
Expansion valve stuck open or closed -
Blower resistor failed -
Blower motor failed -
Fuse blown -
Condenser matrix blockage -
Overcharging of refrigerant system -
Blocked expansion valve/condenser -
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Evacuate and recharge system.
Remove debris from around matrix using
compressed air or low pressure water.
Remove and replace.
Adjust to correct tension.
Renew expansion valve.
Renew resistor.
Renew complete blower unit.
Replace fuse and retest.
Remove debris from around matrix/renew
condenser.
Evacuate and recharge system.
Clear blocked component .
Section B
10 - 1
Issue 1
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