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Daikin EUWA water chillers Seite 7

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EUWA(*)5~24KBZW1
Packaged air-cooled water chillers
4PW61653-1 – 07.2010
Installation and operation manual
4
9 Pump (only EUWAP, EUWAB)
The pump circulates the water in the circuit.
10 Pressure regulating valve
The pressure regulating valve is used to regulate the water flow in
the system.
11 Expansion vessel (only EUWAP, EUWAB)
The water in the water circuit expands with rising temperatures.
The expansion vessel stabilizes the pressure changes with
changing water temperatures by giving free space to the
changing water volume.
12 Buffer tank (only EUWAB)
The buffer tank reduces the variation in water temperature in the
water circuit. This prevents frequent compressor starts and
stops.
13 Drain valve
The drain valve permits complete drainage of the chiller water
system during maintenance or in case of shut down.
14 Fill valve (only EUWAP, EUWAB)
The water circuit can be filled with water via this fill valve.
15 Air purge valve
Remaining air in the chiller water system will be automatically
removed via the air purge valve.
16 Pressure ports water circuit
It is possible to detect any blockage in the water circuit or a
malfunction of the pump by means of the 3 pressure ports.
U 7/16 flare pressure ports are provided to connect a device for
measuring the pump pressure and the evaporator pressure
drop. The waterflow can be deducted from these pressures
(Refer to "Figures pressure characteristics" on page 10).
17 Water filter
The filter installed in front of the pump removes dirt from the
water to prevent damage to the pump or blockage of the
evaporator. The water filter should be cleaned on a regular base.
18 Ball valve
A ball valve is installed in front of and behind the water filter to
allow filter cleaning without having to drain the water circuit.
19 Manometer
The manometer allows readout of available water pressure to
load.
20 Sensor for inlet water temperature
The measured inlet water temperature is used by the controller
for regulating the outlet water temprature.
21 Low pressure gauge (optional)
Measurement on low pressure side compressor.
22 High pressure gauge (optional)
Measurement on high pressure side compressor.
Safety devices (See figure 1)
23 High-pressure switch
The high-pressure switch 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. The unit stops.
When activated, it resets automatically, but the controller needs
to be reset manually.
24 Low pressure switch
The low pressure switch is installed on the suction pipe of the
unit and measures the evaporator pressure (pressure at the inlet
of the compressor). When the pressure is too low, the pressure
switch is activated. The unit stops.
25 Discharge thermal protector (general safety device)
The discharge thermal protector is activated when the
temperature of the refrigerant leaving the compressor becomes
too high. The unit stops.
26 Flow switch
The flow switch measures the flow in the water circuit. In case
the flow does not reach the minimum allowed water flow, the unit
will be shut down.
27 Safety valve (only EUWAP, EUWAB)
The safety valve prevents water pressure from exceeding 3 bar. It
protects the tank against burst. Activation of this safety has no
influence on the operation of the unit.
28 Sensor for outlet water temperature
The outlet water temperature sensor measures the temperature
of the water at the evaporator outlet. The protection device shuts
down the unit when the temperature of the chilled water
becomes too low in order to prevent freezing of the water during
operation.
When water temperature becomes back to normal, the protector
resets automatically, but the controller needs to be reset
manually.
29 Freeze protection (optional)
Heaters protect the chiller water system against freezing.
ELECTRICAL SPECIFICATIONS
Main components (See figure 2) ( only for 16~24 Hp units)
Refer to the wiring diagram supplied with the unit.
1 Power supply intake (L1, L2, L3, N, PE)
The power cables from the local supply panel can be inserted in
the unit through this foreseen entrance.
2 Main switch (S12M)
Power to unit can be disconnected by means of this switch.
3 Switch for pump (S21P)
Pump can be switched between automatically (steered by
controller) or manually on (for servicing purpose) by means of
this switch.
4 Digital controller (A1P)
Controls the functioning of the unit.
5 I/O PCB (A2P) (input/output)
The I/O PCB (A2P) is used to connect all internal wiring and
field wiring. It includes some control and safety functions as well.
6 Softstarter (A5P) (possible optional for 5~12 Hp only)
The softstarter reduces the starting current of the compressor.
Safety devices (See figure 2) ( only for 16~24 Hp units)
5 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.
Unit (Hp) 5 8 10 12 16 20 24
Power circuit
• Phase 3N~
•Frequency
(Hz)
50
•Voltage
(V)
400
•Voltage tolerance
(%)
±10
• Recommended fuses
EUWAN (A)
20 25 25 32 40 50 63
EUWAP+B (A)
20 25 32 40 50 50 63
4PW61653-1_digital_EN.book Page 4 Thursday, August 26, 2010 1:49 PM
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