Operation manual
21
EWAQ080~260DAYN
Packaged air-cooled water chillers
4PW35556-1E
5.6
5.7
5.8
5.9a
5.9b
5.10
5.11
5.12
Symptom 5.6: Superheat temperature is not correct
(
1A9
/
2A9:SUPERHEAT ERR
)
P
OSSIBLE
CAUSES
C
ORRECTIVE
ACTION
Superheat temperature is too high.
Check if the unit has enough
refrigerant (no foaming visible in
sight glass).
Check if the suction temperature
sensor of the EEV driver is in the
holder in the suction tube and not
hanging loose.
Superheat temperature is too low.
Check if the EEV driver or the control
motor of EEV is wired correctly and
operating.
The sensed suction temperature is
more than 2°C higher than the
entering water temperature of the
evaporator.
Check if the suction temperature
sensor of the controller is in its
holder and not hanging loose.
Symptom 5.7: High-pressure switch and high pressure setback
(
1E3
/
2E3:HIGH PRESSURE SW
,
1E3
/
2E3:HP SETBACK
)
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 may not
exceed 43°C.
Fan turning in the wrong direction.
Two phases of the power supply to
the fan motor must be inverted (by a
licensed electrician).
RESET
After pressure rise, this safety resets
automatically, but the controller still
needs to be reset.
Symptom 5.8: Low pressure
(
1E4
/
2E4:LOW PRESSURE
)
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.
Dirty evaporator.
Clean the evaporator, or call your
local dealer.
Low pressure safety setting too high.
Refer to the installation manual
"Customization in the service menu",
paragraph "Setting of the minimum
outlet water temperature" for correct
values.
Flowswitch is not working or no
water flow.
Check the flowswitch and the water
pump.
RESET
After pressure rise, this safety resets
automatically, but the controller still
needs to be reset.
Symptom 5.9a: The compressor does not work (only for SJ161-4)
(Compressor thermal protection is activated)
P
OSSIBLE
CAUSES
C
ORRECTIVE
ACTION
The compressor motor coil
temperature is too high because the
compressor motor takes
(demands/needs) too much current
and is not sufficiently cooled by
refrigerant.
Make sure there are no refrigerant
leaks.
After repairing leaks, charge the unit
with additional refrigerant until the
sight glass in the liquid line shows no
foaming.
Make sure the unit operates within
its operating range (too high ambient
or too high water temperature).
Make sure the compressor motor is
not locked.
RESET
After temperature decrease the
thermal protector is reset
automatically and the compressor
will start again. This is not detected
by the controller.
If the protector is activated
frequently, call your local dealer.
Symptom 5.9b: Compressor safety (only for SJ161-4)
(
1E6
/
2E6:COMPR 1/2 SAFETY)
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.
The unit is working out of its range.
Make sure the unit operates within
its operating range.
Overload of motor.
Reset. If the failure persists, call your
local dealer.
There is a short circuit.
Check the wiring.
RESET
Pull the black handle on the
compressor fuse inside the switch
box and reset the controller.
Symptom 5.10: Compressor safety (only for SJ180-4~SJ240-4 and SJ300-4)
(
1E6
/
2E6:COMPR 1
/
2 SAFETY
)
P
OSSIBLE
CAUSES
C
ORRECTIVE
ACTION
The compressor motor coil
temperature is too high because the
compressor motor takes
(demands/needs) too much current
and is not sufficiently cooled by
refrigerant.
Make sure there are no refrigerant
leaks.
After repairing leaks, charge the unit
with additional refrigerant until the
sight glass in the liquid line shows no
foaming.
Make sure the unit operates within
its operating range (too high ambient
or too high water temperature).
Make sure the compressor motor is
not locked.
RESET
After temperature decrease, a 5
minute delay is activated. After this
delay the relay in the electronic
protection module (EPM) is pulled in.
The controller needs to be reset
manually.
Failure of one of the phases.
Check fuses on the supply panel or
measure the supply voltage.
Voltage too low.
Measure the supply voltage.
The unit is working out of its range.
Make sure the unit operates within
its operating range.
Overload of motor.
Reset. If the failure persists, call your
local dealer.
The compressor is running in
reverse phase (only for SJ240-
SJ300)
Check the wiring.
There is a short circuit.
Check the wiring.
RESET
Pull the black handle on the
compressor fuse inside the switch
box and reset the controller.
Symptom 5.11: Discharge thermal protector is activated
(
1F3
/
2F3:HIGH DISCH TEMP1
/
2
)
P
OSSIBLE
CAUSES
C
ORRECTIVE
ACTION
Unit is working outside the operation
range.
Check the operation condition of the
unit.
The unit is undercharged.
Check if there are no refrigerant
leaks.
After repairing leaks, charge the unit
with additional refrigerant until the
sight glass in the liquid line shows no
foaming.
RESET
After temperature decrease, the
safety resets automatically but the
controller still needs to be reset.
Symptom 5.12: Reverse phase protector is activated
(
1U1
/
2U1:REV PHASE PROT
)
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.
Voltage too low.
Measure the supply voltage.
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.