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Installation and operation manual
30
EWWD440~850AAYNNO**
Packaged water-cooled water chillers
4PW25558-1B
4.
When at normal stop and in case of unit error
M
AINTENANCE
AND
INSPECTION
Periodic inspection of safety devices
It is necessary to carry out periodic inspection and to report results of
these inspections according to applicable laws and regulations.
For checking operation of safety devices, consult your dealer.
WARNING
■
If a malfunction occurs (burning smell, etc.), turn off the
power supply and contact your dealer.
Continuing to operate while the unit is malfunctioning
may result in equipment damage, electrical shock or fire.
■
For repairs, be sure to contact your dealer.
Improper repair could result in electrical shock or fire.
■
Do not turn the unit on or off with the power supply
switch or breaker, etc.
Doing so could result in electrical shock or fire.
CAUTION
■
Before cleaning, be sure to stop operation and to turn
off the power supply.
Failure to do so could result in injury.
■
Make sure the base of the unit is not damaged by
prolonged use.
If damage is not repaired, the unit could fall and result
in injury.
■
Do not climb or place objects on the top of the unit.
Falling or overturning could result in injury.
■
Do not wash the unit.
Doing so could result in electrical shock.
■
Do not operate the unit with wet hands.
Doing so could result in electrical shock.
■
Be sure to dispose of cleansing solutions as stipulated
by law.
Illegal disposal is not only against the law, but can
harm health and the environment.
■
Never touch parts which tend to become hot such as
compressors and refrigerant piping.
Doing so could result in skin burning.
■
Do not attempt to run the compressor by pushing the
magnetic contactor with your finger.
Doing so could result in electrical shock or fire.
1
Abnormal stop
2
Error reset
3
If ON-OFF limitation timer has counted up, restart of the
compressor that had an individual error is available.
4
Normally OFF
5
Normally ON
1
Unit error occurs
2
Error reset
3
Normally OFF
2
1
4
4
5
3
Compressor
with individual
error
Individual error
signal (5X-1 or
5X-2)
Other
compressor
individual error
signal (5X-1 or
5X-2)
Unit error signal
(5X-3)
Operate/stop
monitor (2-88X)
2
1
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
5
4
3
6
3
Operation of all
compressors
Unit error signal
(5X-3) when
operation at
normal stop
Unit error signal
(5X-3) when
operation at
abnormal stop
Individual error
signal of normal
side compressor
(5X-1 or 5X-2)
Operate/Stop
monitor (2-88X)
Chilled water
pump operation
command
(88WEX)
Cooling water
pump operation
command
(88WCX)
4
Residual operation for 6 minutes
5
Chiller is OFF and does not perform residual operation
6
Input of the error reset command results in operation based on the
starting flow and starting time chart.
NOTE
When the remote ON-OFF circuit is established by use
of normal open contacts, make sure that the ON-OFF
signal is turned OFF forcedly in response to contact
5X-3 in case of unit errors.
If the ON-OFF signal stays ON after occurrence of unit
errors, the unit can restart simultaneously with input of
the error reset command and this may lead to
unexpected accidents.
Before carrying out any maintenance or repair activity,
always switch off the circuit breaker on the supply panel,
remove the fuses or open the protection devices of the
unit.
Do never clean the unit with water under pressure.