Safety Devices; Measuring Devices; Internal Wiring - Parts Table - Daikin EUWAC8FZW1 Installation And Operation Manual

Safety devices

In its standard version, the unit is equipped with the following safety
devices:
Overcurrent relay (general safety device)
The overcurrent relay (K4S) is located in the switch box of the
unit and protects the compressor motor in case of overload,
phase failure or too low tension. The relay is factory-set and may
not be adjusted. When activated, it must be reset manually.
High-pressure switch (general safety device)
The high-pressure switch (S1HP) 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 unit stops.
The switch is factory-set and may not be adjusted. The switch
resets automatically, but the controller needs to be reset
manually.
Low pressure switch (general safety device)
The low-pressure switch (S4LP) is installed on the suction pipe
of the unit and measures the suction pressure (pressure at the
inlet of the compressor). When the pressure is too low, the
pressure switch is activated and the unit stops.
The switch is factory set and may not be adjusted. The switch
resets automatically, but the controller needs to be reset
manually.
Reverse phase protector (general safety device)
The reverse phase protector (R1P) is installed in the switch box
of the unit. It prevents the compressor from running in the wrong
direction. If the unit does not start, two phases of the power
supply must be inverted.
Discharge thermal protector (general safety device)
The discharge thermal protector (Q*D) is activated when the
temperature of the refrigerant leaving the compressor becomes
too high. When the temperature returns to normal, the protector
resets automatically, but the controller needs to be reset
manually.
Fan motor thermal protector (part safety device)
The fan motor is equipped with a thermal protector (Q11F). The
protector is activated when the fan motor temperature becomes
too high.
When the temperature returns to normal, the protector resets
automatically.
Outlet water temperature sensor (general safety device)
The outlet water temperature sensor (R4T) measures the
temperature of the water at the water heat exchanger outlet. The
protection device shuts down the circuit when the temperature of
the chilled water becomes too low in order to prevent freezing of
the water during operation.
When the outlet water temperature returns to normal, the
protector resets automatically, but the controller needs to be
reset manually.
Additional interlock contact (general safety device)
To avoid that the unit could be started or run without water
circulating through the evaporator, an interlock contact (S10L) of
e.g. a flow switch must be switched in the start-up circuit of the unit.

Measuring devices

Checking the high and low pressure of the refrigerant circuit is neces-
sary to ensure the proper operation of the unit and to guarantee that
the rated output will be obtained. The unit has therefore been
equipped with a high and low pressure gauge. Refer to the checklist
in the chapter "Switching the EUWAC unit on" on page
High pressure gauge
The high pressure gauge indicates the discharge pressure
(pressure at the outlet of the compressor).
Low pressure gauge
The low pressure gauge indicates the suction pressure
(pressure at the inlet of the compressor).
EUWAC5~10FZ
Packaged air-cooled water chillers
4PW14037-1D

Internal wiring - Parts table

Refer to the internal wiring diagram sticker on the unit.
The abbreviations used are listed below:
A1P .................... PCB: Terminal unit
A2P ............ **.... PCB: Adress card (for optional BMS)
A3P .................... PCB: Fanspeed controller (5 Hp only)
C1 ...................... Capacitor for fanmotor
E1H .................... Crankcase heater
F1,2,3U ...... #..... Fuses
F5B .................... Fuse for control circuit
F7B .................... Fuse for fan circuit
F9B .................... Fuse for secondary of TR1
F8U .................... Surge-proof fuse
F9U ............ ##... Surge-proof fuse (for optional BMS)
H1P ............ * ..... Indication lamp alarm
H3P ............ * ..... Indication lamp operation compressor
K1M.................... Compressor contactor
K4S .................... Over current relay
K1A .................... Auxiliary relay for high pressure
K1F,K3F ............. Contactor for high speed selection of the fan motor
K2F .................... Contactor for low speed selection of the fan motor
KP .............. * ..... Pumpcontactor
M11F.................. Fan motor
M1C ................... Compressor motor
PE ...................... Main earth terminal
Q1D.................... Discharge thermal protector
Q11F .................. Fan thermal protector
R1P .................... Reverse phase protector
R3T .................... Inlet water temperature sensor
R4T .................... Outlet water temperature sensor
S1HP.................. High pressure switch
S4LP .................. Low pressure switch
S4PC.................. Head pressure switch for fanspeed control
S9S ............ * ..... Switch for remote start/stop
S10L........... #..... Flowswitch
S11L........... #..... Contact that closes if the pump is working
S12S .......... #..... Main isolator switch
TR1 .................... Transfo 230 V
X1....................... Connector in terminal unit for digital inputs, analog
X2....................... Connector in terminal unit for digital outputs
Obligatory
Not obligatory
8.
(8+10 Hp only)
(8+10 Hp only)
(8+10 Hp only)
24 V (30 VA) for power supply of
controllers
inputs, analog outputs and for power supply
controller
Not included with standard unit
Not possible as option
#
*
Installation and operation manual
Possible as option
##
**
6