Air conditioning unit for cabs
The air conditioning system will operate only with engine running and the 3-speed electric fan unit switched on.
Technical specifications
type of refrigerant R 134 a
inlet circuit pressure (*): high 2.5 bar
- normal 0.8
÷
2.5 bar
- low 0.8 bar
delivery circuit pressure bar see page 355
quantity of refrigerant in circuit g 1800
quantity of oil cc 250
type of oil (Suniso 5 GS) SP20
minimum pressure switch setting bar 2
maximum pressure switch setting bar 27
electric fan pressure switch setting close at 15 bar - open at 11 bar
tightening torque for pipeline fittings Nm (kgm) 58 (6)
(*)
Pressure is influenced by ambient temperature; in normal operating conditions, with a temperature of 27 °C, pressure
in the delivery circuit will be 12 bar.
Pressure in the same system will register at around 16 bar with an ambient temperature of 38 °C.
Fig. 1 - Diagram showing operation of air conditioning system.
systems
air conditioning
1 Electromagnetic coupling
2 Compressor
3 Condenser
4 Fan
5 Filter
6 Sight glass
7 Minimum pressure switch
8 Electric fan control
pressure switch
9 Maximum pressure switch
10 Expansion valve
11 Evaporator
12 Bulb
13 Potentiometer
86
8
364
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www.classicmachinery.net
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