Mount the expansion valve and evacuate the liquid line, the evaporator and the suction line. Carefully check the leakage first cleaning, then increase the pressure of the refrigerant vapor. Install the fan and the motor if it is used. Open the valve liquid receiver or liquid line hand valve. Start the compressor and watch him work.
In several systems, install all the dry evaporators with expansion valves with individual valves. They should be installed both the liquid and suction lines for each of the evaporator. Adjusting the thermostatic valves for the large differences between the various Cabinet temperature of reasons for " false " actuations. Tin is especially true in evaporators, which closed thing. To resolve this problem, install one or more two-temperature valves on the suction line.
The use of pressure gauges and thermometers to check the superheat setting. When the device is working correctly, connect the defrost. If used, connect the housing and cover. In several business units, with the help of finned evaporator expansion valve is sometimes attached to the evaporator with SAE broke the connection.
Nut in this setup should be shellacked or sealed. This is done after the installation and before the unit starts working. Otherwise, ice may form between the nut and tubing. Soon pipe will crumble or break. This condition can also occur when the suction line is attached to the evaporator. Fig. 15-71 shows pinching operation of ice formation between the nut and tubing.
Other methods have been developed to stop moisture from collecting the outbreak of the nuts. One has a rubber seal at the end of the nut. Another method involves drilling holes through the nut. The idea is that moisture will flow down. If the ice is not the form, it will release its pressure through the holes in the nut. Otherwise, the pressure will be against the tube. Short shank flare nuts should be used in places where glaze happens. As already mentioned, the best type of connection to Cabinet interiors flange connection solder.
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