EWWP014~065KBW1N
Packaged water-cooled water chillers
4PW61660-1A – 04.2012
Operation manual
4
■
Discharge thermal protector
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.
■
Freeze up sensor
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.
■
Fuse for control circuit (F1U)
The fuse for control circuit protects cables of control circuit and
controller components in case of short circuit.
■
Fuse for control circuit (F4)
The fuse for the control circuit protects cables of the control
circuit in case of a short circuit.
■
Fuse for digital controller (F3U)
The fuse protects cables of digital controller and digital controller
in case of short circuit.
■
Flow switch (delivered with the unit, installed in the field)
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.
■
Ball valve (delivered with the unit, installed in the field)
A ball valve is installed in front of and behind the water filter to
allow filter cleaning without having to drain the water circuit.
■
Water filter (delivered with the unit, installed in the field)
The filter installed in front of the unit removes dirt from the water
to prevent damage to the unit or blockage of the evaporator or
condenser. The water filter should be cleaned on a regular base.
■
Air purge valve (delivered with the unit, installed in the field)
Remaining air in the chiller water system will be automatically
removed via the air purge valve.
Internal wiring - Parts table
Refer to the internal wiring diagram supplied with the unit. The
abbreviations used are listed below:
A1P ........................ PCB: controller PCB
A2P ........................ PCB: I/O PCB (input/output)
A3P ..............** ...... PCB: Address card for BMS
(1)
A5P,A6P.......** ...... PCB: Softstarter for circuit 1, circuit 2
(1)
A7P ..............** ...... PCB: Remote user interface
(1)
A71P ...................... PCB: power supply card
A72P ...................... PCB: remote user interface
F1,F2,F3 .......# ...... Main fuses for the unit
(2)
F4 ................. * ...... Fuse I/O PCB
F5 ...............## ...... Surge proof fuse
F6 .................# ...... Fuse for pumpcontactor
(2)
F1U ........................ Fuse I/O PCB
F3U ........................ Fuse for controller PCB
H3P............... * ...... Indication lamp alarm
(2)
H4P............... * ...... Indication lamp operation compressor 1
(2)
H5P............... * ...... Indication lamp operation compressor 2
(2)
H6P............... * ...... Indication lamp general operation
(2)
K1M,K2M ............... Compressor contactor circuit 1, circuit 2
K4S,K5S ................ Overcurrent relay circuit 1, circuit 2
K6S ............... * ...... Overcurrent relay pump
(2)
K1P ............... * ...... Pumpcontactor
M1C,M2C............... Compressor motor circuit 1, circuit 2
PE .......................... Main earth terminal
Q1D,Q2D ............... Discharge thermal protector circuit 1, circuit 2
R3T ........................ Evaporator inlet water temperature sensor
R4T ........................ Evaporator outlet water temperature sensor
R5T ........................ Condenser inlet temperature sensor
S1HP,S2HP............ High pressure switch circuit 1, circuit 2
S4LP,S5LP............. Low pressure switch circuit 1, circuit 2
S7S ............... * ...... Switch for remote cooling/heating selection or
dual setpoint
(2)
S9S ............... * ...... Switch for remote start/stop or dual setpoint
(2)
S10L ...................... Flow switch
S12M ..................... Main isolator switch
TR1 ........................ Transfo 230 V
➞
24 V for supply of controller
PCB
TR2 ........................ Transfo 230 V
➞
24 V for supply of I/O PCB
(A2P)
Y3R........................ Reversing valve
X1~3,X1~82A ........ Connectors
(1) optional
(2) field supply
Not included with standard unit
Not possible as option
Possible as option
Obligatory
#
##
Not obligatory
*
**