• 62 • BALTIC-IOM-0412-E / Service manual
SERVICE DIAGNOSTIC
Refrigeration (cont'd)
Indoor fan blower
Outdoor axial fan
Fault Possible cause and symptoms Solution
HP problems and HP cut outs
Moisture or contaminants in the system
If the circuit pressure is higher (<1 bar) than the saturated
pressure corresponding to the measured outdoor temperature,
there is possibility that some contaminants are present in the
system.
Reclaim the refrigerant, and vacuum the circuit (ensure very
low and slow vacuum for R410A)
Recharge the unit
Condenser coil is obstructed Check the condenser coil and clean is necessary
Recycled hot air Check clearance around the condenser
Strong variations of pressure
( 2 to 3 bar) expansion valve
"hunting"
Incorrect adjustment of the expansion valve
Low refrigerant charge
Filter drier obstructed with gas bubbles at the
expansion valve inlet
Moisture in the system
Refer to LP problems and LP cut out section
Very high discharge temperature,
High amps measured at
compressor
Very high superheat, very hot compressor
Reduce the superheat on the electronic valve.
Check the pressure drop on the fi lter drier in the suction line
Four way reversing valve possibly blocked,
abnormal noise from the valve, low LP and
increasing HP
Check operation of the valve by going through cycle
inversions. Change if necessary.
Refer to LP problems
Fault Possible cause and symptoms Solution
High amps on action fan motor
Pressure drop in the ducting installation too
low.
Reduce the rotation speed of the fan
Read the airfl ow and pressure and compare with the
specifi cation from customer.
High amps on reaction fan motor
Pressure drop in the ducting installation too
high.
Reduce the rotation speed of the fan
Read the airfl ow and pressure and compare with the
specifi cation from customer.
Unstable running and high
vibration
Fan jumping from one operating point to the
other
Change rotation speed of the fan.
Fault Possible cause and symptoms Solution
Heat pump mode: circuit breaker
open
High amps due to a low voltage from the main
supply
Check the voltage drop when all components are running.
Change the circuit breaker for one with a higher rating.
High amps due to freezing of the coil
Check the adjustable amps on the motor starter.
Adjust the defrost cycle set points.
FLEXY™: water ingress in the motor
connection box.
Change the component
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