Conditioner Control In The Heating Mode; Cab Ventilation - Belarus 1523.5 Operator's Manual

With the help of the switch 1 you can change air flow by changing fan speed. The switch 2
allows to change temperature of cold and dry air coming from deflectors 6 (fig. 2.1.1) in the
conditioning mode.
ATTENTION: THE AIR CONDITIONER CAN BE SWITCHED ON AND CAN OPERATE
ONLY WITH THE ENGINE ON!
To switch on the conditioner, it is required to do the following:
turn cut-out switch 2 (figure 2.4.1) clockwise to 180° until a blue scale begins;
then turn switch 1 to one of three marked positions (the fan rotor has three kinds of rota-
tion speed). After 3-5 minutes adjust the required temperature in the cab by means of
switch 2;
it is possible to adjust a mixture of outer air and recirculation air with recirculation shut-
ters 7 (figure 2.1.1) if available;
To switch off the conditioner, it is required to turn both switches 1 and 2 (figure 2.4.1) con-
traclockwise into "0" position.
ATTENTION: MAKE SURE THE CONDITIONER IS SWITCHED OFF BEFORE STOP-
PING THE ENGINE!
ATTENTION: WHEN THE CONDITIONER OPERATES IN THE COOLING MODE MAKE
SURE THAT THE HEATER CONTROL VALVE IS SHUT OFF IN ORDER TO PREVENT
THE SYSTEMS OF HEATING AND COOLING FROM SIMULTANEOUS OPERATION!

2.4.2 Conditioner control in the heating mode

ATTENTION: REFILLING OF THE ENGINE COOLING SYSTEM SHALL BE CARRIED
OUT ONLY WITH LOW-FREEZING LIQUID SPECIFIED IN THE SUBSECTION "TRAC-
TOR FILLING AND LUBRICATION WITH FUEL AND LUBRICATION MATERIALS"!
To set the conditioner into the heating mode, do the following:
- after refilling the cooling system with the cooling fluid, start the engine and let the engine
run at medium idle without opening the heater control valve to reach 70-80°C of cooling
system temperature;
- then open the heater control valve with handle 2 (figure 2.4.2), to do this turn handle 2
contraclockwise against the stop;
- increase engine speed and let it run for one-two minutes until the heater radiator is filled
up with the fluid. Make sure the fluid circulates through the heater. The heater radiator
must warm up. In this case the cooling fluid level in the cooling system radiator will de-
crease;
- refill the cooling fluid into the expansion tank until it is half full;
- to warm up the cab quickly, switch on the heater fan and open recirculation shutters.
ATTENTION: WHEN OPERATING IN THE HEATING MODE, SWITCH 2 (FIGURE 2.4.1)
SHALL BE COMPLETELY OFF TO PREVENT THE COOLING SYSTEM AND THE
HEATING SYSTEM FROM SIMULTANEOUS OPERATION!
1 – sun visor, 2 – handle of heater control valve; 3 – upper shield unit of button switches.

2.4.3 Cab ventilation

During the conditioner operation in the cooling and heating modes, cab ventilation is car-
ried out at the same time. To make the conditioner operate only in the ventilation mode it is
necessary to close the heater control valve, set switch 2 (figure 2.4.1.) in the position "0"
and switch 1 in any of three marked positions.
Figure 2.4.2 – Installation of heater control valve
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1523.5-0000010 OM