Function Of The Main Components; Safety Devices - Daikin EWLQ014KBW1N Manuel D'utilisation

Function of the main components

EWLQ014~033KBW1N
6 13
5 13
EWLQ049~064KBW1N
Figure: Functional diagram
1 Compressor
2 Filter
3 Expansion valve
4 Evaporator
5 Evaporator water outlet
6 Evaporator water inlet
7 Sight glass
8 Liquid solenoid valve
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 to a pressure at
which it can easily be liquified in the condenser.
Filter
The filter installed behind the condenser removes small particles
from the refrigerant to prevent blockage of the tubes.
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
refrigerant.
Water in/outlet connections
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.
EWLQ014~064KBW1N
Condenserless water-cooled water chillers
D­EPMHP01108­17EU
15 14 4
R3T
12
R4T
R3T
R4T
the condenser, into gaseous
11 1
S4LP
M1C
LP
Q1D
HP
3 7
S5LP
M2C
LP
Q2D
HP
S4LP
M1C
LP
Q1D
HP
9 Liquid stop valve
10 Discharge stop valve
11 Accumulator
12 Flow switch (delivered with the unit, installed in the field)
13 Ball valve (delivered with the unit, installed in the field)
14 Water filter (delivered with the unit, installed in the field)
15 Air purge valve (delivered with the unit, installed in the field)
Field piping

Safety devices

The unit is equipped with General safety devices: shut down all
circuits and stop the whole unit.
I/O PCB (A2P) (input/output)
The I/O PCB (A2P) contains a reverse phase protector.
The reverse phase protector detects if the 3 phases of the power
supply are connected correctly. If a phase is not connected or if
2 phases are inverted, the unit can not start up.
Overcurrent relay
The overcurrent relay (K*S) is located in the switch box of the
unit and protects the compressor motor in case of overload,
phase failure or too low voltage. The relay is factory-set and may
not be adjusted. When activated, the overcurrent relay has to be
reset in the switch box and the controller needs to be reset
manually.
High-pressure switch
The high-pressure switch (S*HP) is installed on the discharge
pipe of the unit and measures the condenser pressure (pressure
at the outlet of the compressor). When the pressure is too high,
the pressure switch is activated and the circuit stops.
When activated, it resets automatically, but the controller needs
to be reset manually.
10
S1HP
8 2 9
S2HP
S1HP
Operation manual
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