Cab Air Conditioning And Heating System; Climate System Control In Air Conditioning Mode; Climate System Control In Heating Mode - Belarus 920.4 Operating Manual

BELARUS-920.4/952.4

2.5 Cab air conditioning and heating system

2.5.1 Climate system control in air conditioning mode

The climate system control panel is in the center of the upper panel of the cab. The control
panel has the switches 1 and 2 (Figure 2.10).
Figure 2.10 – Controls of cab air conditioning and heating system
With the switch 1, you can adjust air flow by changing fan speed. With the switch 2, you can
change temperature of cold and dry air going out of the deflectors in the air conditioning mode.
ATTENTION: AIR CONDITIONER CAN BE TURNED ON AND OPERATE ONLY
WHEN THE ENGINE IS RUNNING
To turn on the conditioner, proceed as follows:
- turn the switch 2 (Figure 2.10) clockwise by 180°C to the beginning of the blue scale;
- then turn the switch 1 to one of the three marked positions (the fan impeller has three
speeds). In 3-5 minutes, use the switch 2 to adjust the desired temperature in the cab;
- with the shutters located on the upper panel, near to the operator's head, the mix of exter-
nal and recirculating air can be adjusted;
To turn off the air conditioner, turn both switches 1 and 2 counterclockwise to "0" position.
ATTENTION: WHEN WORKING IN THE COOLING MODE, THE HEATER VALVE
MUST BE CLOSED TO PREVENT SIMULTANEOUS OPERATION OF THE AIR HEATING
AND COOLING SYSTEMS.

2.5.2 Climate system control in heating mode

ATTENTION: REFILL THE ENGINE COOLING SYSTEM ONLY WITH AN ANTI-
FREEZE AGENT.
For efficient operation of the heating system, observe the following recommendations:
1. After refilling the cooling system with antifreeze agent, start the engine and, without open-
ing the valve, let the engine work at medium speed to have the antifreeze agent in the cooling system
warmed up to 70 to 80°С, after that open the valve, increase the engine speed and let it work for 1 to 2
minutes to have the heat exchanger filled with the agent. Make sure that the antifreeze agent is circu-
lating through the heater. The heat exchanger must warm up. The coolant level in the heat exchanger
of the engine cooling system will drop at that.
2. Add coolant to the heat exchanger to the required level (up to the "MAX" mark on the
expansion tank);
3. To have the cab quickly warmed up, turn on the heater fan and open the recirculating
shutters;
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