BELARUS-920.4/952.4 Operating manual
41
2.5.4 Air conditioning unit troubleshooting
Table 6
Fault Possible
reason
Remedy
The electromagnetic coupling of
the compressor does not operate
(when turning the temperature
regulator, no distinctive metallic
click is heard)
1. Electric equipment
failure
2. Coolant leak oc-
curred.
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, Minsk, tel./fax
++375-17-262-40-75, ++375-29-
662-97-69, +375-29-628-67-98)
Air conditioner fan engine does not
operate
Electric equipment
failure
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
(
М
7, 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.
When the air conditioner is in the
heating mode, warm air is supplied
to the cab
Sealing of the valve
П
O-11 (or
ВС
11)
damaged.
Replace the valve
П
O-11 (or
ВС
11)
Leak of refrigerating fluid from
cab ventilation box
Broken pipes of the
heat exchanger (dam-
age from frost due to
incomplete discharge
when working with
water during cold sea-
son).
Replace the climate unit of the
conditioner.
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.
https://tractormanualz.com/
