Daikin EWAD120MBYNN1 Operation Manual page 17

Symptom 4: The circuit 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
• High pressure switch (S*PH)
• 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
5.1
Symptom 5.1: Overcurrent relay of compressor
P
OSSIBLE CAUSES
Failure of one of the phases.
Voltage too low.
Overload of motor.
RESET
5.2
Symptom 5.2: Low pressure
P
OSSIBLE CAUSES
Waterflow 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.
Dirty evaporator.
Low pressure safety setting too high.
Flowswitch is not working or no
waterflow.
RESET
5.3
Symptom 5.3: 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.
Fan turning in the wrong direction.
RESET
EWAD120~340MBYNN
Packaged air-cooled water chillers
4PW22683-1
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.
Push the blue button on the over-
current relay inside the switch box
and reset the controller.
C
ORRECTIVE ACTION
Increase the waterflow.
Check for leaks and refill refrigerant,
if necessary.
Check the operation conditions of
the unit.
Increase the inlet water temperature.
Clean the evaporator, or call your
local dealer
Refer to the installation manual
"Customization in the service menu",
paragraph "Setting of the minimum
outlet water temperature" for correct
values.
Check the flowswitch and the water
pump.
After pressure rise, this safety 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 may not
exceed 43°C.
Two phases of the power supply to
the fan motor must be inverted (by a
licensed electrician).
After pressure decrease, push the
button on the high-pressure switch
and reset the controller.
5.4
Symptom 5.4: Fan thermal protector is activated
P
OSSIBLE CAUSES
Mechanical failure (fan is blocked).
Air flow in the unit too low or outdoor
temperature too high.
RESET
5.5
Symptom 5.5: 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
5.6
Symptom 5.6: Discharge thermal protector is activated
P
OSSIBLE CAUSES
Unit is working outside the operation
range.
RESET
5.7
Symptom 5.7: Flowswitch is activated
P
OSSIBLE CAUSES
No waterflow or too low waterflow.
RESET
5.8
Symptom 5.8: Freeze-up protection is activated
P
OSSIBLE CAUSES
Waterflow too low.
Inlet temperature to the evaporator is
too low.
Flowswitch is not working or no
waterflow.
RESET
5.9
Symptom 5.9: Compressor thermal protector is activated
P
OSSIBLE CAUSES
Compressor motor coil temperature
too high.
RESET
Symptom 6: Unit stops soon after operation
P
OSSIBLE CAUSES
The schedule timer is activated and
is in off mode.
One of the safety devices is
activated.
Voltage is too low.
C
ORRECTIVE ACTION
Check that the fan rotates freely.
Clean the air heat exchanger
properly.
After temperature decrease, the
thermal protector is reset
automatically.
If the protector is activated
frequently, replace the motor or call
your local dealer.
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 controller 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 and the water
circuit for obstructions.
After finding the cause, the
flowswitch is reset automatically, but
the controller still needs to be reset.
C
ORRECTIVE ACTION
Increase the waterflow.
Increase the inlet water temperature.
Check the flowswitch and the water
pump.
After temperature increase the
freeze-up is reset automatically, but
the circuit controller needs to be
reset.
C
ORRECTIVE ACTION
Compressor is not cooled sufficiently
by the refrigerant medium.
After temperature decrease the
thermal protector is reset
automatically, but the circuit
controller needs to be reset.
If the protector is activated
frequently, call your local dealer.
C
ORRECTIVE ACTION
Work according to the settings in the
schedule timer or disable the
schedule timer.
Check safety devices (refer to
Symptom 5: One of the following
safety devices is activated).
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).
Operation manual
16