EWWD120~540MBYNN
Packaged water-cooled water chillers
4PW22685-1
Operation manual
4
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 refri-
gerant 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.
■
Waterfilter
The waterfilter protects the evaporator against clogging.
S1PH
S14PH
R3T
R4T
R5T
Y11S
M1C
Y15S
B2P
Y16S
10
S3T
S15PH
S2PH
R6T
Y21S
M2C
Y25S
B5P
Y26S
S4T
2
8
7
9
5
6
(*)
(**)
(***)
11
F
11
G
11
11
H
11
11
J
3
3
4
4
EWWD120~280
EWWD360~540
15
16
B1P
12
A
B4P
12
D
B1P
12
C
R9T
14
B3P
B
R10T
14
B6P
E
1
(*)
13
13
13
13
13
1
Evaporator
12
Expansion valve
(*)
See A~E
2
Condenser
13
Suction stop valve (option)
(**)
- Standard
(see F and G) only for EWWD120~180,360
- Dual pressure relief valve (OP03)
(see H and J) only for EWWD240~280)
3
Water out
14
Electronic expansion valve
4
Water in
15
Flowswitch
5
Drier
16
Filter
6
Discharge stop valve
(***)
- Standard
(see F and G) only for EWWD360 and 440
- Dual pressure relief valve (OP03)
(see H and J) only for EWWD500~540)
7
Charge valve
A
only for EWWD120~180
8
Stop valve
B
only for EWWD240~280, EWWD440~540
9
Strainer
C
only for EWWD360
10
Sightglass
D
only for EWWD440
11
Safety valve
E
only for EWWD500~540
