EWWD440~850AAYNNO**
Packaged water-cooled water chillers
4PW25558-1B
Installation and operation manual
19
I
NSTRUCTIONS
BEFORE
OPERATION
First operation (Very important)
Before full-scale operation of the unit and at first operation after
longer periods of standstill (6 months), be sure to perform and check
the items described below while witnessing the first operation.
Selection between remote operation (“REMOTE”) or local
operation (“LOCAL”) for the unit to run or to stop, is set on the
graphic panel display.
[“MENU”
➞
“OPERATION”]
1
In order to avoid compressor damage, it is necessary to switch
on the crankcase heater for at least 6 hours before starting the
compressor.
2
Select "LOCAL"
3
Perform inching of the compressor by starting the unit and
stopping the unit after 2 to 3 seconds of operation
Task to check: Direction of rotation of the compressor
Judgment: Pressure indicated by the discharge pressure
gauge shall exceed the pressure indicated by the suction
pressure gauge.
If the discharge pressure increases due to operation of the
compressor, the compressor rotates in the correct direction.
Local operation on the unit “LOCAL”
Selection between remote operation (“REMOTE”) or local
operation (“LOCAL”) for the unit to run or to stop, is set on the
graphic panel display.
[“MENU”
➞
“OPERATION”]
1
Select "LOCAL"
1
This is a setting on number of compressors in operation
during full load operation.
Normally select "2UNITS".
2
In this field you need to set the compressor that starts first
after power-up of the unit.
"1" is the left side viewed compressor from the front of the
switch box.
"2" is the right side viewed compressor from the front of the
switch box.
If "UNITS TO CONTROL" is set to "1UNIT", only the
compressor selected in this setting operates.
3
Set the year, month, day and time.
4
Set the display language.
(English, Chinese and Japanese are available.)
NOTE
This is the screen of models with 2-temperature
setting option.
In the screen for standard models, the field for
cooling mode selection does not appear.
■
Never attempt to perform a first time check of the
unit running or stopping by means of a remote
signal.
■
For the first time check, it is required to perform a
witness operation to stop the unit immediately in
case of emergency.
1
2
3
4
1
Discharge pressure gauge
2
Suction pressure gauge
3
Start button (green)
4
Stop button (red)
5
Emergency stop button (red)
■
Perform this check on both compressors.
■
For performing this check efficiently, it is
recommended to first read the paragraph
"“SETTING” screen (2/2)" on page 15
and to set
starting sequence of compressors in function of
your witness test.
NOTE
■
This is the screen of models with 2-
temperature setting option.
In the screen for standard models, the field
for cooling mode selection does not appear.
■
Selection must be made while the unit is
stopped.
Switching between "REMOTE" and "LOCAL"
while the unit is operating (even when
thermostat is OFF) causes the unit to stop.
1
2
3
4
5