Daikin EWYQ080DAYN, Operation Manual

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EWYQ080~250DAYN
Packaged air-cooled water chillers
4PW35558-1B 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 refri-
gerant 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 (in cooling mode) or evaporator (in heating mode)
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.
■
Liquid receiver
The liquid receiver prevents the plate heat exchanger from
flooding with liquid in heating mode caused by a great difference
between the volumes of coil and plate heat exchanger.
■
Filter/drier
The filter installed behind the condenser removes small particles
from the refrigerant to prevent damage to the compressor and
expansion valve.
The drier takes the 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.
p <
M12C M11C
M15F
M13F
M14F
R14T
B1PL
R15T R25T
R17T
Y12E
PHE
t >
2
4 4
13 13
17
11
20
18
16
C
15
14
t > R16T
7
7
7
7
15
15 15
p >
B1PH
19
p >
S1PH
21
Y11E
14
5
R18T
(
*
)
15
15
p <
M22C M21C
M25F
M23F
M24F
R14T
B1PL
R45T R35T
R37T
Y22E
4 4
13 13
11
20
18
16
C
15
15
14
t > R36T
7
7
7
7
15
15
15
p >
B2PH
19
p >
S2PH
21
Y21E
14
5
R38T
(
*
)
15
15
15
6 6
9 9
8
12 12
1
3
A D D D
10
B
10
22
25
24
23
27
30
29
31
31
28
26
32
24 35
34 33
t > t >
R3T R2T
D
D
D
D
D
D
8
23
23
1 Water outlet 12 Liquid stop valve (optional) 24 Drain valve Cooling flow direction
2 Evaporator 13 Oil sight glass 25 Regulating valve Heating flow direction
3 Water inlet 14 Electronic expansion valve + sight
glass with moisture indication 26 Pump
4 Compressor 27 Fill port (*) Standard (A) or dual pressure
relief valve (B)
5 Liquid receiver 15 Check valve 28 Drain port
6 4-way valve 16 Condenser 29 Expansion vessel A Standard
7 Non-return valve 17 Ambient temperature sensor 30 Pressure gauge B Dual pressure relief valve
8 Suction stop valve (optional) 18 Fan 31 Air purge C Only for 210 units
9 Discharge stop valve
(optional) 19 High pressure sensor 32 Buffer tank D Optional
20 Low pressure sensor 33 Filter
10 Refrigerant circuit safety
valve 21 High pressure switch 34 Shut off valve
22 Flowswitch 35 Water circuit safety
valve
11 Drier/charge valve 23 Service port