Operation manual
3
EWAP110~340MBYNN
Packaged air-cooled water chillers
4PW22677-1
Function of the main components
Figure - Functional diagram
As the refrigerant circulates through the unit, changes in its state or
condition occur. These changes are caused by the following main
components:
■
Compressor
The compressor (M*C) acts as a pump and circulates the
refrigerant in the refrigeration circuit. It compresses the
refrigerant vapour coming from the evaporator at the pressure at
which it can easily be liquefied in the condenser.
■
Condenser
The function of the condenser is to change the state of the
refrigerant from gaseous to liquid. The heat gained by the gas in
the evaporator is discharged through the condenser to the
ambient air, and the vapour condenses to liquid.
■
Filter/drier
The filter installed behind the condenser removes small particles
from the refrigerant to prevent blockage of the tubes.
The drier takes water out of the system.
■
Expansion valve
The liquid refrigerant coming from the condenser enters the
evaporator via an expansion valve. The expansion valve brings
the liquid refrigerant to a pressure at which it can easily be
evaporated in the evaporator.
■
Evaporator
The main function of the evaporator is to take heat from the
water that flows through it. This is done by turning the liquid
refrigerant, coming from the condenser, into gaseous
refrigerant.
■
Water in/outlet connection
The water inlet and outlet connection allow an easy connection
of the unit to the water circuit of the air handling unit or industrial
equipment.
■
Flowswitch
The flowswitch protects the evaporator of the unit against
freezing when there is no waterflow or when the waterflow is too
low.
■
Water filter
The water filter protects the evaporator against clogging.
Safety devices
The unit is equipped with three kinds of safety devices:
1
General safety devices
General safety devices shut down all circuits and stop the whole
unit. For this reason the unit has to be manually put on again
after a general safety occurred.
Y15S
Y11S
M1C
R5T
S14PH
S1PH
Y16S
R3T
R5T
R4T
S3T
8
9
A
A
B
B2P
B1P
M11F
M12F
M14F
M13F
M21F
M22F
M24F
M23F
M11F
M12F
M14F
M13F
4
3
1
10
11
5
6
2
7
12
13
14
15
Y15S
Y11S
M1C
S14PH
S1PH
S3T
Y16S
R3T
R4T
B1P
4
3
1
10
11
5
6
2
7
12
13
14
15
B2P
EWAP110~160
EWAP200~340
1
Evaporator
10
Expansion valve
2
Condenser
11
Sightglass
3
Water outlet
12
Suction stop valve (optional)
4
Water inlet
13
Strainer
5
Drier
14
Flowswitch
6
Charge valve
15
Water filter
7
Liquid stop valve
A
Standard (see 8) or optional dual pressure relief valve (see 9)
8
Standard: safety valve
B
Only for EWAP280 or EWAP340: standard (see 8) or optional dual
pressure relief valve (see 9)
9
Optional dual pressure relief valve: safety valves
