Troubleshooting - Daikin EWLQ014KBW1N Operation Manual

T
ROUBLESHOOTING
This section provides useful information for diagnosing and correct-
ing 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
P
OSSIBLE CAUSES
The temperature setting is not
correct.
Power supply failure.
Blown fuse or interrupted protection
device.
Loose connections.
Shorted or broken wires.
Symptom 2: The unit does not start, but the
P
OSSIBLE CAUSES
The flowstart timer is still running.
The anti-recycling timer is still active.
The guard timer is still active.
Symptom 3: The unit does not start and the
P
OSSIBLE CAUSES
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)
The unit is in anti-freeze alarm.
The remote ON/OFF input is
enabled and the remote switch is off.
The keyboard is locked. The user
parameter h09 is set to 0.
Operation manual
15
L
LED lights up
C
ORRECTIVE ACTION
Check the controller setpoint.
Check the voltage on the supply
panel.
Inspect fuses and protection devices.
Replace by fuses of the same size
and type (refer to chapter "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.
L
LED is flashing
C
ORRECTIVE ACTION
The unit will start after approx.
15 seconds. Make sure that water
is flowing through the evaporator.
The circuit can only start up after
approximately 6 minutes.
The circuit can only start up after
approximately 1 minute.
L
LED does not light up
C
ORRECTIVE ACTION
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 9.
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 9
Put the remote switch on or disable
the remote ON/OFF input.
Unlock the controller keyboard.
Symptom 4: One of the following safety devices is activated
Symptom 4.1: Overcurrent relay of compressor
P
OSSIBLE CAUSES
Failure of one of the phases.
Voltage too low.
Overload of motor.
RESET
Symptom 4.2: Low pressure switch or anti-freeze alarm
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.
RESET
Symptom 4.3: High-pressure switch
P
OSSIBLE CAUSES
Condenser fan does not operate
properly.
Dirty or partially blocked condenser.
Inlet air temperature of the
condenser is too high.
RESET
Symptom 4.4: 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.
RESET
Symptom 4.5: Discharge thermal protector is activated
P
OSSIBLE CAUSES
Unit is working outside the operation
range.
RESET
Symptom 4.6: Flow switch is activated
P
OSSIBLE CAUSES
No water flow.
RESET
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.
Push the red button on the over-
current relay inside the switch box.
The controller still needs to be reset.
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.
After pressure rise, the low pressure
switch resets automatically, but the
controller still needs to be reset.
C
ORRECTIVE ACTION
Check that the fans turn freely. Clean
if necessary.
Remove any obstacle and clean
condenser coil using brush and
blower.
The air temperature measured at the
inlet of the condenser should not
exceed 43°C.
After pressure decrease, the high
pressure switch resets automatically,
but the controller still needs to be
reset.
C
ORRECTIVE ACTION
Invert two phases of the power
supply (by licensed electrician).
Check the connection of all phases.
After inverting two phases or fixing
the power supply cables properly,
the protector is reset automatically,
but the unit still needs to be reset.
C
ORRECTIVE ACTION
Check the operation condition of the
unit.
After temperature decrease, the
thermal protector resets
automatically but the controller still
needs to be reset.
C
ORRECTIVE ACTION
Check the water pump.
After finding the cause, the flow
switch is reset automatically, but the
controller still needs to be reset.
EWLQ014~064KBW1N
Condenserless water-cooled water chillers
D­EOMHP01108­17EU