31
SKOPE Reflex Upright Fridge, Freezer, Combo
Troubleshooting
Service Manual
8. Generally, a system with the correct refrigerant charge will frost back to the
compressor. If the frost does not go back to the point shown there may be a
capillary blockage or compressor fault. The point where the frost stops is
affected by the ambient temperature. The tables above show system
characteristics at different charge and 25°C ambient condition for a
cartridge running on the bench.
9. Determine whether the system is short of refrigerant, blocked capillary or
compressor fault.
A dry suction could indicate either short of gas, blocked capillary or
compressor fault, and further analysis may be required. If there is no frost
present at the evaporator coil inlet pipe a blocked capillary is likely. If frost
is forming at evaporator coil inlet pipe system, and suction/compressor is
behaving as shown in table above at 50% or 75%, the system is likely short
of gas.
10. After fault has been diagnosed and repaired, reassemble the refrigeration
system and test run.
RF7.UPF.2.SD (cartridge UTKDDI-0019)
RF7.UPF.2.SD (cartridge UTKDNI-0037)
Observation 50% charged 75% charged 100% charged
Suction pipe at
compressor
Suction dry Suction cold Frost back to
compressor shell
Evaporator coil
½ return bends
frosted
All return bends frosted All return bends
frosted
Unit power <350W 475W to 500W >575W
Evaporator
temperature
>0°C <-10 to -15°C <-20°C
Observation 50% charged 75% charged 100% charged
Suction pipe at
compressor
Suction dry Suction cold Suction cold and wet
Evaporator coil
½ return bends
frosted
¾ return bends frosted All return bends
frosted
Unit power <425W 500W to 550W >600W
Evaporator
temperature
>10°C <-15 to -20°C <-30°C
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