NANO

842

HVAC

TROUBLESHOOTING AND DIAGNOSIS

In order to find the causes of troubles as quickly as

possible, it is necessary to conduct troubleshooting

using a rational method and procedure.

Before starting troubleshooting, first confirm the

symptoms as follows:

(a) Start the engine and keep it idling. Then turn the

blower switch and AC switch on, and check the

AC working conditions.

(b) Check the blower operation, the magnetic clutch

operation andAC outlet air temperature.

condenser fan should switch ‘ON’.

After confirmation of symptoms, conduct the following

rational method of troubleshooting.

10.7.1 Visual and Audio Inspection

The simplest way to detect troubles is by looking and

listening.

(a) Is the AC belt loose?

(b) Are the condenser fins covered with dirt and dust?

In this case, the condenser cooling effect will be

greatly reduced. As a result, the cooling capacity

will also decrease.

A clogged AC filter will reduce the air flow and

lower the cooling capacity.

(d) Can oil stains be seen in the refrigeration cycle

connections and joints?

A place that shows an oil strain indicates that the

refrigerant is leaking from that place together with

compressor oil.