Possible Failures Of Air-Conditioning And Cab Heating Systems And Instructions For Troubleshooting - Belarus 922.6 Operator's Manual

6.12 Possible failures of air-conditioning and cab heating systems and instruc-
tions for troubleshooting
List of possible failures of air-conditioning and cab heating systems and guidelines for
troubleshooting are shown in Tables 6.12.1 and 6.12.2.
Table 6.12.1 – Possible failures of air-conditioning and cab heating systems and guide-
lines for troubleshooting
Failure, external manifestations,
cause
Coolant is not circulated through heat-
ing unit:
- turn over heater control valve
- heater fan is out of order
Table 6.12.2 – Possible failures of air-conditioning (mounted against order) and instructions for
their troubleshooting
Failure, external manifestations,
cause
Compressor electromagnetic coupling will not respond (no metallic click while turn-
Electric equipment failure
Coolant leakage took place
Electric equipment failure
When air conditioner operated in cooling mode warm air is supplied into cab
Valve PO-11 seal element breakage
Coolant or condensed fluid leakage from cab ventilation compartment
Dirty air conditioner drain tubes
Disruption of heating unit tubes
Warm air is not supplied into the cab
Open the heater control valve
Correct the fan failure, check electric circuit of fan en-
gagement according to the electrics diagram of electri-
cal equipment
ing temperature regulator)
By means of a tester or a multimeter, check operabil-
ity of pressure sensor unit, sensor unit outputs (red
and pink wires) shall be "rung out" among them-
selves. Check up operability of electric circuit con-
nections from compressor coupling to air conditioner
control console according to the electrical equipment
diagram
Detect the leak path.
Only specially trained personnel is allowed to detect
the leak path, replace hoses and air conditioner
components using special equipment (after-sales
service and
"Belvneshinvest", Minsk, tel./fax 8-017-262-40-75, 8-
029-662-97-69, 8-029-628-67-98)
Non-operable conditioner fan electric motor
Check up operability of the corresponding fuse element
located in the switching unit. Replace if it is faulty.
If the safety lock is properly operating, check by means
of indicating lamp power supply on the electric motor of
air conditioner fan when the switch is on and "ground"
is available in electric motor. If electric circuits are
properly operating, but there is lack of power supply,
replace the switch.
Replace valve PO-11
Clean the air conditioner drain tubes, as specified in
point 6.4.1.12 "Operation 11. Check/cleaning dirt of condi-
tioner drain tubes "
Replace the conditioner climatic unit
Troubleshooting
Troubleshooting
repair shall be carried out by CJSC
185
922.6-0000010 OM