Daikin EWLQ014KBW1N, Operation Manual

Page: 16 / 174

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 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
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 9.
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 9
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
Condenser fan does not operate
properly. Check that the fans turn freely. Clean
if necessary.
Dirty or partially blocked condenser. Remove any obstacle and clean
condenser coil using brush and
blower.
Inlet air temperature of the
condenser is too high. The air temperature measured at the
inlet of the condenser should not
exceed 43°C.
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.
4PW61666-1A.book Page 15 Friday, May 25, 2012 3:09 PM
Operation manual
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EWLQ 014
~
064KBW1N
Condenserless water-cooled water chillers
D­EOMHP01108­17EU