EWWD120~540MBYNN
Packaged water-cooled water chillers
4PW22685-1
Operation manual
6
M1S,M2S ............... Stepless capacity control for compressor
circuit 1, circuit 2
PE.......................... Main earth terminal
Q1M,Q2M .............. Thermal protector compressor motor
R1,R2 .................... Auxiliary resistance for feedback
R1F,R2F................. Feedback resistance for compressor circuit 1,
circuit 2
R1P,R2P ................ Reverse phase protector
R3T........................ Sensor for evaporator inlet water temperature
R4T,R6T ................ Sensor for evaporator outlet water temperature
circuit 1, circuit 2
R5T........................ Sensor for condensor inlet water temperature
R7T........................ Mixed outlet water temperature sensor (only for
EWWD360~540)
R8T........................ Sensor for evaporator outlet water in a DICN
system
R9T,R10T .............. Temperature sensor EEV for circuit 1 (A2P),
circuit 2 (A3P)
S1PH,S2PH........... High pressure switch circuit 1, circuit 2
S3T,S4T................. Discharge thermal protector circuit 1, circuit 2
S5E........................ Emergency stop push button
S6S.............*......... Changeable switch for remote function
(e.g. remote start/stop)
S8L,S10L............... Flowswicth circuit 1, circuit 2
S9L,S11L....# ........ Contact that closes if the pump is working
S10S...........*......... Changeable switch for remote function
(e.g. dual setpoint)
S11S...........*......... Changeable switch for remote function
(e.g. enable/disable capacity limitation 1)
S12S...........*......... Changeable switch for remote function
(e.g. enable/disable capacity limitation 2)
S13S...........## ...... Main isolator switch
S14PH,S15PH....... High pressure switch
TC01,TC02 ............ Optocoupler (analog to digital signal) (only for
EWWD360~540)
TR1........................ Transfo control circuit
TR2........................ Transfo supply cont digital inputs
V1 ...............** ....... V-meter
V1F ........................ Filter for EEV
V2C~V5C .............. Ferrite for EEV
X2A~X4A ............... Connector 24, 20, 16 pole to main switchbox
(only for EWWD360~540)
Y1E,Y2E ................ Electronic expantion valve circuit 1, circuit 2
Y11S,Y21S ............ 12% capacity step for compressor circuit 1,
circuit 2
Y15S,Y25S ............ Liquid injection valve of the compressor circuit 1,
circuit 2
Y16S,Y26S ............ Liquid line solenoid valve circuit 1, circuit 2
B
EFORE
OPERATION
Checks before initial start-up
After the installation of the unit, check the following before switching
on the circuit breaker:
1
Field wiring
Make sure that the field wiring between the local supply panel
and the unit has been carried out according to the instructions
described in the installation manual, according to the wiring
diagrams and according to European and national regulations.
2
Additional pump interlock contact
Additional pump interlock contact (S9L) must be provided. Make
sure that the contact has been installed between the appropriate
terminals (refer to the wiring diagram supplied with the unit). The
contact must be a normal open contact.
3
Fuses or protection devices
Check that the fuses or the locally installed protection devices
are of the size and type specified in the installation manual.
Make sure that neither a fuse nor a protection device has been
bypassed.
4
Earth wiring
Make sure that the earth wires have been connected properly
and that the earth terminals are tightened.
5
Internal wiring
Visually check the switch box on loose connections or damaged
electrical components.
6
Fixation
Check that the unit is properly fixed, to avoid abnormal noises
and vibrations when starting up the unit.
7
Damaged equipment
Check the inside of the unit on damaged components or
squeezed pipes.
8
Refrigerant leak
Check the inside of the unit on refrigerant leakage. If there is a
refrigerant leak, call your local dealer.
9
Oil leak
Check the compressor on oil leakage. If there is an oil leak, call
your local dealer.
10
Stop valves
Open the liquid line, discharge and suction (if provided)
stopvalves completely.
11
Power supply voltage
Check the power supply voltage on the local supply panel. The
voltage must correspond to the voltage on the identification label
of the unit.
12
Water connection
Check water piping system and circulating pumps.
Check if the filter kit that was supplied with the unit separately is
installed correctly in front of the evaporator water inlet.
13
Water sensors
Check that all the water sensors are correctly fixed into the pipes
connected to the evaporator.
Not included with standard unit
Not possible as option
Possible as option
Obligatory
#
##
Not obligatory
*
**
Make sure that the circuit breaker on the power supply
panel of the unit is switched off.
