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REFRIGERATION SYSTEM SERVICE AND ANALYSIS
CHART
!! REFRIGERATION SYSTEM
The Refrigeration System consists of a hermetically sealed compressor and
finned evaporator and condenser.
!! CONDENSER
The condenser has wide finned spaces, which allow more air passage with less dirt or dust accumulation. The condenser still
requires periodic cleaning for maximum efficiency.
!! CONDENSER FAN MOTOR
The condenser fan motor assembly is mounted between the condenser and the compressor. Air is drawn through the condenser,
over the body of the compressor and out the rear of the unit compartment.
The motor is wired to cycle with the compressor but will continue to operate should the compressor cut out on the overload. (The
motor is permanently lubricated; therefore, oiling is not required).
!! DRIER
The drier is installed in the system just before the capillary tube. Its purpose is to trap minute particles of foreign material and
absorb any moisture in the system.
!! LI!UID CONTROL AND HEAT EXCHANGE
Liquid refrigerant control to the evaporator of the system is accomplished by the use of a capillary tube. This capillary tube is
soldered to the suction line to form a heat exchanger which subcools the liquid refrigerant to maintain high efficiency within the system.
REFRIGERATION SERVICE
!! EVACUATION
Moisture in a refrigeration system is directly or indirectly the cause of more problems and complaints than all other factors
combined.
When large amounts of moisture are present, system freeze ups will occur. Even in minute amounts, moisture will combine with
refrigerants to form an acid. The corrosive action of this acid forms sludge, which will plug the lines and drier.
Since most field type vacuum pumps cannot pull a low enough vacuum to remove all moisture from the system, it is recommended
that the system be triple evacuated, breaking each time with dry refrigerant nitrogen. Use care to purge air from the charging hose when
breaking the vacuum.
!! CHARGING REFRIGERATION SYSTEM
Since capillary tube systems have small critical refrigerant charges, we recommend that a field charge either be weighed in or put in
from a portable charging cylinder. After maximum vacuum has been obtained as detailed above, attach charging cylinder to the system
line making sure to purge air from hose with refrigerant. With the unit running, allow refrigerant to run slowly into the system until the
desired charge is reached. When using Refrigerant Blends it is recommended to liquid charge into the high side of the system with the
initial charge and then any remaining charge can be put into the suction side; however, care must be taken to meter the remaining
amount into the low side so as not to cause excess liquid to go into the compressor.
OVERCHARGE
When the cabinet has pulled down to operating temperature,
an indication of an overcharge is that the suction line will be
cooler that normal with the compressor running. Running
time will be higher than normal. Suction line will sweat or
frost.
Reclaim excessive refrigerant from the system very carefully
in small amounts waiting several minutes for the system to
balance.
UNDERCHARGE
An undercharge or shortage of refrigerant will result in any of
the following:
1.! Lower than normal head pressure.
2.! Lower than normal suction pressure.
3.! Excessive or continuous operation of compressor.
4.! Higher than normal cabinet temperature.
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