2022.3-0000010 OM
156
The climatic unit starts to operate in a conditioning mode with running engine, when
required fan speed is set with a switch 1 (figure 2.4.1) and the switch 2 is set in the begin-
ning of a blue scale.
Hereby, power is supplied to the electromagnetic clutch of the compressor 7
through the control circuit (figure 3.22.2). The clutch engages and transmits rotation from
the engine crankshaft pulley to the compressor shaft. The compressor pumps coolant
through the components of the conditioning system. Herewith, the coolant absorbs heat of
air, passing through the heater/cooler 8, then giving up heat to the atmosphere through the
condenser 6.
The conditioning system can automatically maintain a preset temperature, that is
set by turning the switch 2 (figure 2.4.1), which controls the thermostat. Clockwise turning
decreases the temperature and contraclockwise turning increases it. The protection
against critical conditions is ensured by the pressure sensor 4 (figure 3.22.2) and by the
thermostat. The pressure sensor 4 cuts the system off at excessive (more than
2,6+0,2MPa) or insufficient (less than 0,21±0,03 MPa) pressure. The thermostat cuts the
system off at excessive temperature fall in the freon radiator of the cooler-heater 8. The
system performance is adjusted by fan rpms and by the thermostat. The compressor 7 can
operate in this case either constantly or periodically.
Main parameters and specifications of the cab air conditioning and heating system
are given in the table 3.7.
Table 3.7
Parameter (specification) description
Value
Cooling performance, kW
6,4
Heating performance, kW
8,7
Operating voltage, V
12
Electrical power consumption, W
260
Mechanical power consuption, kW
1,4 ... 8,0
Coolant
R134a, ozone-friendly
At irregular operation it is recommended to switch on the system in the cooling
mode (when the outside temperature is above +15°C) for 15…20 min once in fifteen days
for keeping the air conditioning system in operating condition
Irrespective of operating conditions it is necessary to check the air conditioning sys-
tem operation once a year at a service station using special equipment.
When putting the tractor for short-time storage no preparatory works are needed for
the conditioning system. During the short-term storage it is necessary to switch on the
conditioner for 15…20 min. once in fifteen days with the engine running. Hereby, air tem-
perature in the tractor cab should be below +20° .
When putting the tractor for a long-time storage it is necessary to check the air con-
ditioning system operation using special equipment. If it is necessary, top up the coolant.
During storage no service works are to be carried out.
After long-term storage it is necessary to carry out maintenance of the conditioning
system in a specialized service station using diagnostic equipment.
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