ERAP110~170MBYNN
Air-cooled condensing units
4PW22681-1
Operation manual
14
5.5
5.6
5.7
5.8
Symptom 6: Unit stops soon after operation
Symptom 7: Excessive noises and vibrations of the unit
Symptom 8: The alarm message shows
$
8
Symptom 9: The alarm message shows
$
9
Symptom 10: Sensor or transmitter error
10
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 must be executed at least once a year. In case the unit is
used for other applications, the checks must be executed every
4 months.
Maintenance activities
■
Air heat exchanger
Remove dust and any other contaminant from the coil fins using
a brush and a blower. Blow from the inside of the unit. Take care
not to bend or damage the fins.
■
Field wiring and power supply
•
Check the power supply voltage on the local supply panel. The
voltage must 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
■
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.
■
Fan motor
•
Clean the cooling ribs of the motor.
•
Check on abnormal noises. If the fan or motor are damaged, call
your local dealer.
■
Water sensors
Check that all the water sensors are correctly fixed into the heat
exchanger (see also the sticker attached to the heat exchanger).
Disposal requirements
Dismantling of the unit, treatment of the refrigerant, of oil and of other
parts must be done in accordance with relevant local and national
legislation.
Symptom 5.5: 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 controller still needs to be
reset.
Symptom 5.6: 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 5.7: Flowswitch is activated
P
OSSIBLE
CAUSES
C
ORRECTIVE
ACTION
No air- or waterflow over/through the
evaporator.
Check the fan- or water pump.
RESET
After finding the cause, the
flowswitch is reset automatically, but
the controller still 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
Unit has not been fixed properly.
Fix the unit as described in the
installation manual.
P
OSSIBLE
CAUSES
C
ORRECTIVE
ACTION
The control motor is not reacting due
to bad wiring to the motor or the
motor is damaged.
Check if the wiring to the control
motor is correct and not damaged or
loose.
P
OSSIBLE
CAUSES
C
ORRECTIVE
ACTION
The control motor is operating in
reverse due to wrong wiring.
Check if the wiring is according to
the wiring diagram.
P
OSSIBLE
CAUSES
C
ORRECTIVE
ACTION
The wiring is wrong.
Check if the wiring is according to
the wiring diagram. Call your local
dealer.
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.
Never clean the unit with water under pressure.
The wiring and power supply must be checked by a
licensed electrician.
