EWWP014~065KBW1N
Packaged water-cooled water chillers
4PW61660-1A – 04.2012
Operation manual
14
T
ROUBLESHOOTING
This section provides useful information for diagnosing and correcting
certain troubles which may occur in the unit.
Before starting the trouble shooting procedure, carry out a thorough
visual inspection of the unit and look for obvious defects such as
loose connections or defective wiring.
Before contacting your local dealer, read this chapter carefully, it will
save you time and money.
When a safety device was activated, stop the unit and find out why
the safety device was activated before resetting it. Under no circum-
stances safety devices may be bridged or changed to a value other
than the factory setting. If the cause of the problem cannot be found,
call your local dealer.
Symptom 1: The unit does not start, but the
L
LED lights up
Symptom 2: The unit does not start, but the
L
LED is flashing
Symptom 3: The unit does not start and the
L
LED does not light up
Symptom 4: One of the following safety devices is activated
Symptom 5: Unit stops soon after operation
When carrying out an inspection on the supply panel or on
the switch box of the unit, always make sure that the circuit
breaker of the unit is switched off.
P
OSSIBLE
CAUSES
C
ORRECTIVE
ACTION
The temperature setting is not correct.
Check the controller setpoint.
Power supply failure.
Check the voltage on the supply
panel.
Blown fuse or interrupted protection
device.
Inspect fuses and protection devices.
Replace by fuses of the same size
and type (refer to chapter
"Electrical
specifications" on page 2
).
Loose connections.
Inspect connections of the field
wiring and the internal wiring of the
unit. Tighten all loose connections.
Shorted or broken wires.
Test circuits using a tester and repair
if necessary.
P
OSSIBLE
CAUSES
C
ORRECTIVE
ACTION
The flowstart timer is still running.
The unit will start after approx. 15
seconds. Make sure that water is
flowing through the evaporator.
The anti-recycling timer is still active.
The circuit can only start up after
approximately 6 minutes.
The guard timer is still active.
The circuit can only start up after
approximately 1 minute.
P
OSSIBLE
CAUSES
C
ORRECTIVE
ACTION
One of the following safety devices is
activated:
• Reverse phase protector
• Overcurrent relay (K*S)
• Discharge thermal protector (Q*D)
• Evaporating temperature
thermostat (S*T)
• Flow switch (S10L)
• High pressure switch (S*HP)
Check on the controller and refer to
symptom "4. One of the following
safety devices is activated". Refer to
the explanation of the digital
controller in the chapter
"Resetting
alarms" on page 8
.
The unit is in anti-freeze alarm.
Check on the controller and refer to
symptom "4. One of the following
safety devices is activated". Refer to
the explanation of the digital
controller in the chapter
"Resetting
alarms" on page 8
The remote ON/OFF input is
enabled and the remote switch is off.
Put the remote switch on or disable
the remote ON/OFF input.
The keyboard is locked. The user
parameter
h09
is set to
0
.
Unlock the controller keyboard.
Symptom 4.1: Overcurrent relay of compressor
P
OSSIBLE
CAUSES
C
ORRECTIVE
ACTION
Failure of one of the phases.
Check fuses on the supply panel or
measure the supply voltage.
Voltage too low.
Measure the supply voltage.
Overload of motor.
Reset. If the failure persists, call your
local dealer.
RESET
Push the red button on the over-
current relay inside the switch box.
The controller still needs to be reset.
Symptom 4.2: Low pressure switch or anti-freeze alarm
P
OSSIBLE
CAUSES
C
ORRECTIVE
ACTION
Water flow to water heat exchanger
too low.
Increase the water flow.
Shortage of refrigerant.
Check for leaks and refill refrigerant,
if necessary.
Unit is working out of its operation
range.
Check the operation conditions of
the unit.
Inlet temperature to the water heat
exchanger is too low.
Increase the inlet water temperature.
Flow switch is not working or no
water flow.
Check the flow switch and the water
pump.
RESET
After pressure rise, the low pressure
switch resets automatically, but the
controller still needs to be reset.
Symptom 4.3: High-pressure switch
P
OSSIBLE
CAUSES
C
ORRECTIVE
ACTION
Water flow through the condenser is
too low.
Increase the water flow and/or check
the strainer for clogging.
RESET
After pressure decrease, the high
pressure switch resets automatically,
but the controller still needs to be
reset.
Symptom 4.4: Reverse phase protector is activated
P
OSSIBLE
CAUSES
C
ORRECTIVE
ACTION
Two phases of the power supply are
connected in the wrong phase
position.
Invert two phases of the power
supply (by licensed electrician).
One phase is not connected
properly.
Check the connection of all phases.
RESET
After inverting two phases or fixing
the power supply cables properly,
the protector is reset automatically,
but the unit still needs to be reset.
Symptom 4.5: Discharge thermal protector is activated
P
OSSIBLE
CAUSES
C
ORRECTIVE
ACTION
Unit is working outside the operation
range.
Check the operation condition of the
unit.
RESET
After temperature decrease, the
thermal protector resets
automatically but the controller still
needs to be reset.
Symptom 4.6: Flow switch is activated
P
OSSIBLE
CAUSES
C
ORRECTIVE
ACTION
No water flow.
Check the water pump.
RESET
After finding the cause, the flow
switch is reset automatically, but the
controller still needs to be reset.
P
OSSIBLE
CAUSES
C
ORRECTIVE
ACTION
One of the safety devices is
activated.
Check safety devices (refer to
symptom "4. One of the following
safety devices is activated").
Voltage is too low.
Test the voltage in the supply panel
and, if necessary, in the electrical
compartment of the unit (voltage
drop due to supply cables is too
high).
