Before servicing unit, disconnect electrical service. Failure to disconnect electrical service could result in electrical shock and cause personal injury or death.
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5. Hold the cover until it is completely loose and hanged by the supporting pins. (See Figure 11).
DANGER
Before servicing unit, disconnect electrical service. Failure to disconnect electrical service could result in electrical shock and cause personal injury or death.
FIGURE 10 – RELEASE EVAPORATOR COVER
FIGURE 11 – EVAPORATOR COVER SUPPORT
EVACUATION
Moisture in a refrigeration system may affect performance.
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
Refer to Table 2 for refrigerant type and amount of charge. Since capillary tube systems have small critical refrigerant charges, it is recommended that a field charge either be weighed in or transferred 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 charge into the high side of the system with the initial charge and then add any remaining charge into the suction side; however, care must be taken to meter the remaining amount into the low side so that excess liquid does not enter the compressor.
TROUBLESHOOTING Refer to Table 3 and Figure 12.
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