Air Conditioning Unit Troubleshooting; Electric Equipment - Belarus 920.4 Operating Manual

BELARUS-920.4/952.4

2.5.4 Air conditioning unit troubleshooting

Table 6
Fault
The electromagnetic coupling of
the compressor does not operate
(when turning the temperature
regulator, no distinctive metallic
click is heard)
Air conditioner fan engine does not
operate
When the air conditioner is in the
heating mode, warm air is supplied
to the cab
Leak of refrigerating fluid from
cab ventilation box
Note – Instead of a climate system, a heater fan can be installed on your tractor. Control
and design of the fan heater is described in the operating manual 900–0000010 OM supplied with
your tractor.

2.6 Electric equipment

Annex A contains the electric circuit diagram of BELARUS– 920.4/952.4/1025.4/1221.4
tractors with a list of components.
Possible reason
1. Electric equipment
failure
2. Coolant leak oc-
curred.
Electric equipment
failure
Sealing of the valve
ПO-11
(or
damaged.
Broken pipes of the
heat exchanger (dam-
age from frost due to
incomplete discharge
when working with
water during cold sea-
son).
41
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With a tester or multimeter, check
operation of the pressure sensor
unit, the sensor unit terminals (the
red and pink wires) must create a
continuous circuit.
Check operation of the electric cir-
cuit connections from the compres-
sor coupling to the air conditioner
control panel.
Find the refrigerating fluid leak
spot.
Detection of leaks, replacement of
hoses and components is performed
by trained personnel with use of
special equipment (warranty service
and repair is performed by Belvne-
shinvest CJSC,
++375-17-262-40-75,
662-97-69, +375-29-628-67-98)
Check condition of the respective fuse
(25A, see the electric circuit diagram,
Annex A) on the fuse block F4 located
on the instrument panel. Replace if
faulty.
With a test lamp, check availability of
power at the air conditioner engine
(М7, Annex A) with the switch ON and
the engine "ground" available. If the
electric circuits are in good condition,
but there is no power at M7, replace the
switch.
Replace the valve ПO-11 (or
ВС11)
ВС11)
Replace the climate unit of the
conditioner.
Operating manual
Remedy
Minsk, tel./fax
++375-29-