Troubleshooting - Daikin Hydrocube EWWQ049KAW1M Manuel D'utilisation

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 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.
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 ON LED lights up
P
OSSIBLE CAUSES
The temperature setting is not
correct.
The flowstart timer is still running.
Neither one of the circuits can start
up.
Unit is in manual mode (all
compressors at 0%).
Power supply failure.
Blown fuse or interrupted protection
device.
Loose connections.
Shorted or broken wires.
Symptom 2: The unit does not start, but the ON LED is flashing
P
OSSIBLE CAUSES
The remote ON/OFF input is
enabled and the remote switch is off.
Symptom 3: The unit does not start and the ON LED does not light up
P
OSSIBLE CAUSES
All circuits are in failure mode.
One of the following safety devices is
activated:
• Flow switch (S8L,S9L)
• Emergency stop
The ON LED is broken.
The unit is in bypass mode.
EWWQ049~064KAW1M + ECB2+3MUCW
Packaged water-cooled water chillers
D-EOMHP01008-17EU_01
C
ORRECTIVE ACTION
Check the controller setpoint.
The unit will start after approx. 15
seconds. Make sure that water is
flowing through the evaporator.
Refer to Symptom 4: One of the
circuits does not start up.
Check on the controller.
Check the voltage on the supply
panel.
Inspect fuses and protection
devices. Replace by fuses of the
same size and type (refer to
"Electrical specifications" on
page 2).
Inspect connections of the field
wiring and the internal wiring of the
unit. Tighten all loose connections.
Test circuits using a tester and repair
if necessary.
C
ORRECTIVE ACTION
Put the remote switch on or disable
the remote ON/OFF input.
C
ORRECTIVE ACTION
Refer to Symptom 5: One of the
following safety devices is activated.
Refer to Symptom 5: One of the
following safety devices is activated.
Contact your local dealer.
Check the bypass remote contact.
Symptom 4: One of the circuits does not start up
P
OSSIBLE CAUSES
One of the following safety devices is
activated:
• Compressor thermal protector (Q*M)
• Overcurrent relay (K*S)
• Discharge thermal protector (S*T)
• Low pressure switch
• High pressure switch (S*HP)
• Reverse phase protector (R*P)
• Freeze-up
The anti-recycling timer is still active.
The guard timer is still active.
The circuit is limited to 0%.
Symptom 5: One of the following safety devices is activated
Symptom 5.1: Overcurrent relay of compressor
P
OSSIBLE CAUSES
Failure of one of the phases.
Voltage too low.
Overload of motor.
Symptom 5.2: Low pressure switch
P
OSSIBLE CAUSES
Water flow to water heat exchanger
too low.
Shortage of refrigerant.
Unit is working out of its operation
range.
Inlet temperature to the water heat
exchanger is too low.
Flow switch is not working or no
water flow.
Symptom 5.3: High-pressure switch
P
OSSIBLE CAUSES
Water flow to condenser is too low.
Symptom 5.4: Reverse phase protector is activated
P
OSSIBLE CAUSES
Two phases of the power supply are
connected in the wrong phase
position.
One phase is not connected
properly.
Symptom 5.5: Discharge thermal protector is activated
P
OSSIBLE CAUSES
Unit is working outside the operation
range.
C
ORRECTIVE ACTION
Check on the controller and refer to
Symptom 5: One of the following
safety devices is activated.
The circuit can only start up after
approximately 10 minutes.
The circuit can only start up after
approximately 1 minute.
Check the "enable/disable capacity
limitation" remote contact.
C
ORRECTIVE ACTION
Check fuses on the supply panel or
measure the supply voltage.
Measure the supply voltage.
Reset. If the failure persists, call your
local dealer.
RESET
Push the blue button on the over-
current relay inside the switch box
and reset the controller.
C
ORRECTIVE ACTION
Increase the water flow.
Check for leaks and refill refrigerant,
if necessary.
Check the operation conditions of
the unit.
Increase the inlet water temperature.
Check the flow switch and the water
pump.
RESET
After pressure rise, this safety resets
automatically, but the controller still
needs to be reset.
C
ORRECTIVE ACTION
Increase the water flow and/or check
the strainer for clogging.
RESET
After finding the cause, push the
button on the high-pressure switch
housing and reset the controller.
C
ORRECTIVE ACTION
Invert two phases of the power
supply (by licensed electrician).
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 controller still needs to be
reset.
C
ORRECTIVE ACTION
Check the operation condition of the
unit.
RESET
After temperature decrease, the
thermal protector resets
automatically but the controller still
needs to be reset.
Operation manual
14