EWWP045~06 ECB1~3MUW
Packaged water-cooled water chillers
4PW30041-1A
Operation manual
20
Symptom 6: Unit stops soon after operation
Symptom 7: Unit runs continuously and the water temperature remains
higher than the temperature set on the controller
Symptom 8: Excessive noises and vibrations of the unit
M
AINTENANCE
In order to ensure optimal availability of the unit, a number of checks
and inspections on the unit and the field wiring have to be carried out
at regular intervals.
If the unit is used for air conditioning application, the described
checks should be executed at least once a year. In case the unit is
used for other applications, the checks should be executed every
4 months.
Important information regarding the refrigerant used
This product contains fluorinated greenhouse gases covered by the
Kyoto Protocol.
Refrigerant type:
R407C
GWP
(1)
value:
1652.5
(1)
GWP = global warming potential
Periodical inspections for refrigerant leaks may be required
depending on European or local legislation. Please contact your local
dealer for more information.
Maintenance activities
■
Field wiring and power supply
•
Check the power supply voltage on the local supply panel.
The voltage should correspond to the voltage marked on the
identification label of the unit.
•
Check the connections and make sure they are properly
fixed.
•
Check the proper operation of the circuit breaker and the
earth leak detector provided on the local supply panel.
■
Internal wiring of the unit
Visually check the switch boxes on loose connections (terminals
and components). Make sure that the electrical components are
not damaged or loose.
■
Earth connection
Make sure that the earth wires are still connected properly and
that the earth terminals are tightened.
■
Refrigerant circuit
•
Check for leaks inside the unit. In case a leak is detected, call
your local dealer.
•
Check the working pressure of the unit. Refer to paragraph
"Switching the unit on" on page 6
(32~72Hp).
■
Compressor
•
Check on oil leaks. If there is an oil leak, call your local
dealer.
•
Check for abnormal noises and vibrations. If the compressor
is damaged, call your local dealer.
■
Water supply
•
Check if the water connection is still well fixed.
•
Check the water quality (refer to the installation manual of the
unit for specifications of the water quality).
■
Water filters
•
Check if the mesh width is 1 mm maximum.
Disposal requirements
Dismantling of the unit, treatment of the refrigerant, oil and any other
parts, should be done in accordance with the relevant local and
national regulations.
Symptom 5.6: 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.
Symptom 5.7: Freeze-up protection is activated
P
OSSIBLE
CAUSES
C
ORRECTIVE
ACTION
Water flow too low.
Increase the water flow.
Inlet temperature to the evaporator 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 temperature increase the
freeze-up is reset automatically, but
the circuit controller needs to be
reset.
Symptom 5.8: Compressor thermal protector is activated
P
OSSIBLE
CAUSES
C
ORRECTIVE
ACTION
Compressor motor coil temperature
too high.
Compressor is not cooled sufficiently
by the refrigerant medium.
RESET
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.
P
OSSIBLE
CAUSES
C
ORRECTIVE
ACTION
The schedule timer is activated and
is in off mode.
Work according to the settings in the
schedule timer or disable the
schedule timer.
One of the safety devices is
activated.
Check safety devices (refer to
Symptom 5: One of the following
safety devices is activated
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).
P
OSSIBLE
CAUSES
C
ORRECTIVE
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 dealer.
Water flow is too high.
Recalculate the water flow.
The circuit is limited.
Check the "enable/disable capacity
limitation" remote contact.
P
OSSIBLE
CAUSES
C
ORRECTIVE
ACTION
Unit has not been fixed properly.
Fix the unit as described in the
installation manual.
Before carrying out any maintenance or repair activity,
always switch off the circuit breaker on the supply panel,
remove the fuses or open the protection devices of the
unit.
Do never clean the unit with water under pressure.
The wiring and power supply must be checked by a
licensed electrician.
