SWDM240B OPERATION & MAINTENANCE MANUAL
1-Main pump system 2-Air intake system 3-Engine system
4-Fuel pipeline system 5-Coolant heating system (optional) 6-Exhaust system
7-Cooling system
See the details about use and maintenance of engine system in the chapter Maintenance.
2.3.5 Air-Conditioning System
Electric heating and cooling air conditioning is adopted to improve the indoor comfort of the
cab.
The main technical parameters of the air-conditioning：
1）System refrigerating capacity: 5000W
2）System heating capacity：5000W
3）System air output：600 m
3
/h
4）Freezing medium：R-134a
5）Compressor exhaust volume: 155 cm
3
/r
6）System voltage: 24V.DC
7）Power consumption: 260W (rated)
8） Mechanical power consumption: ≤2.5 KW
9） Working environment:-30℃～42℃ （temperature） 20％～90％ （relative humidity）
1. Working Principle of Air Conditioner
Refrigeration: The compressor compresses the gaseous refrigerant into the refrigerant gas
of high temperature and high pressure, then the refrigerant gas is discharged into the condenser
from the compressor nozzle, and cools down to become the liquid, then flow to the reservoir.
High temperature and high pressure of the refrigerant liquid is flowed into the evaporator
after dry filter within the reservoir, after expansion valve throttling depressurization, become
the low temperature and low pressure gas-liquid mixture, and then be inhaled from the low
pressure intake pipe, it is a constant cycle. Evaporator continuously absorbs heat to send cold
air to the cab, attaining the effect of refrigeration.（as FIG.2-9）
Heating: Hot water in engine is guided into the evaporator element, on which the cold air
is sent by fan continuously, and then change with hot water, making cold air into hot one. And
the hot air is blown into cab through air pipe of the air conditioner. Above circulation is
repeated continuously, so as to heat. (as FIG. 2-10
）
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