Operation manual
5
EWAD120~340MBYNN
Packaged air-cooled water chillers
4PW22683-1
S14PH,S15PH .......High pressure switch circuit 1, circuit 2
TC01~TC04............Optocoupler (analog to digital signal)
TR1 ........................Transfo control circuit
TR2 ........................Transfo supply cont digital inputs
V1............... ** ........V-meter for circuit 1 (and for 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 interlock contacts (S*L) should be provided (e.g.
flowswitch, contact of pump motor contactor). Make sure that
they have been installed between the appropriate terminals
(refer to the wiring diagram supplied with the unit). They should
be normal open contacts.
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
Air inlet/outlet
Check that the air inlet and outlet of the unit is not obstructed by
paper sheets, cardboard, or any other material.
12
Power supply voltage
Check the power supply voltage on the local supply panel. The
voltage should correspond to the voltage on the identification
label of the unit.
13
Water connection
Check water piping system and circulating pumps.
Check if a water filter is installed correctly in front of the
evaporator water inlet.
Water supply
Fill the water piping, taking into account the minimum water volume
required by the unit. Refer to the "installation manual".
Make sure that the water is of the quality as mentioned in the
installation manual.
Purge the air at the high points of the system and check the operation
of the circulation pump and the flowswitch.
Power supply connection and crankcase heating
To switch on the crankcase heater proceed as follows:
1
Switch on the circuit breaker on the local supply panel. Make
sure that the unit is
"
OFF
"
.
2
The crankcase heater is switched on automatically.
3
Check the supply voltage on the supply terminals L1, L2, L3, by
means of a voltmeter. The voltage must correspond to the
voltage indicated on the identification label of the unit. If the
voltmeter reads values which are not within the ranges specified
in the technical data, check the field wiring and replace the
supply cables if necessary.
4
Check the LED on the reverse phase protectors. If it lights up,
the phase order is correct. If not, switch off the circuit breaker
and call a licensed electrician to connect the wires of the power
supply cable in the correct phase order.
5
Check if the crankcaseheaters are warming up.
After 8 hours, the unit is ready for operation.
General recommendations
Before switching on the unit, read following recommendations:
1
When the complete installation and all necessary settings have
been carried out, close all front panels of the unit.
2
The service panels of the switch boxes may only be opened by a
licensed electrician for maintenance purposes.
3
To prevent the evaporator from freezing and to avoid damage to
the LCD displays of the digital controller, never switch off the
power supply during winter.
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.
In order to avoid compressor damage, it is necessary to
switch on the crankcase heater for at least 8 hours before
starting the compressor after a long period of standstill.
