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Daikin EUWA water chillers Manual

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Installation and operation manual
19
EUWA(*)5~24KBZW1
Packaged air-cooled water chillers
4PW61653-1 – 07.2010
Symptom 4: One of the following safety devices is activated
Symptom 5: Unit stops soon after operation
Symptom 6: Unit runs continuously and the water temperature remains
higher, respectively lower than the temperature set on the controller
Symptom 7: Excessive noises and vibrations of the unit
Symptom 8: Water flow is too low
Symptom 9: Pump is making noise (cavitation)
Symptom 4.1: Overcurrent relay of compressor
POSSIBLE CAUSES CORRECTIVE 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 Daikin 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
POSSIBLE CAUSES CORRECTIVE 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
POSSIBLE CAUSES CORRECTIVE 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 may 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: Fan thermal protector is activated
POSSIBLE CAUSES CORRECTIVE ACTION
Mechanical failure (fan is blocked). Check that the fan rotates freely.
Air flow in the unit too low or outdoor
temperature too high.
Clean the air heat exchanger
properly.
RESET After temperature decrease, the
thermal protector is reset
automatically.
If the protector is activated
frequently, replace the motor or call
your local Daikin dealer.
Symptom 4.5: Reverse phase protector is activated
POSSIBLE CAUSES CORRECTIVE 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 controller still needs to be
reset.
Symptom 4.6: Discharge thermal protector is activated
POSSIBLE CAUSES CORRECTIVE 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 4.7: Flow switch is activated
POSSIBLE CAUSES CORRECTIVE ACTION
Water flow too low. Check the water pump.
RESET After finding the cause, the flow
switch is reset automatically, but the
controller still needs to be reset.
POSSIBLE CAUSES CORRECTIVE ACTION
One of the safety devices is
activated.
Check safety devices (refer to "One
of the following safety devices is
activated" on page 19).
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).
POSSIBLE CAUSES CORRECTIVE ACTION
The temperature setting on the
controller is too low.
Check and adjust the temperature
setting.
The heat production in the water
circuit is too high.
The cooling capacity of the unit is too
low. Call your local Daikin dealer.
Water flow is too high. Recalculate the water flow.
POSSIBLE CAUSES CORRECTIVE ACTION
Unit has not been fixed properly. Fix the unit as described in the
installation manual.
POSSIBLE CAUSES CORRECTIVE ACTION
Shut-off valve is not completely
open.
Open the shut-off valve completely.
There is air in the system. Purge the air.
The filter is not clean. Clean the filter.
There is an obstruction in the circuit. Remove the obstruction.
Pressure regulating valve is not
enough open.
Open more.
The chosen pump has not enough
capacity.
Check ∆p over pump.
Install heavier pump.
POSSIBLE CAUSES CORRECTIVE ACTION
Shut-off valve is not completely
open.
Open completely.
There is air in the system. Purge air.
The filter is not clean. Clean filter.
Pre-pressure and required water
pressure are not according to
installation instructions or expansion
vessel is broken.
Recalculate the values as described
in chapter "Setting the pre-pressure
of the expansion vessel" on page 7
and "Charging water" on page 8.
4PW61653-1_digital_EN.book Page 19 Thursday, August 26, 2010 1:49 PM
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