TEV Adjustment

Most TEVs are adjusted at a predetermined superheat setting and tested at the factory before they are shipped. If you need a different superheat setting, follow the steps in table 14-1(A).

Table 14-1(A).-Determining Superheat

Note: When adjusting the expansion valve, turn the adjusting stem no more than one full turn and wait approximately 15-30 minutes for the system to balance out. Once the system is balanced, recheck the superheat setting by following the steps in table 14-1(A).

RECEIVERS AND ACCUMULATORS

The receiver is a storage tank for liquid refrigerant. When a refrigeration system is equipped with a receiver, you can close the outlet valve (king valve) and pump refrigerant into the receiver. This enables you to store the refrigerant while you

work on the unit. Additionally, when a unit is equipped with a receiver, the quantity of refrigerant in the system is less critical than a unit not so equipped. Figure 14-23 shows the location of a receiver installed in a system. This is a commercial system with an air-cooled condenser, a thermostatic expansion valve, and a V type of reciprocating compressor.

The accumulator is located inside the refrigeration cabinet and acts as a safety device. As a safety device it prevents the flow of liquid refrigerant into the suction line and the compressor. This is because liquid refrigerant causes considerable knocking and damage to the compressor. Figure 14-24 shows the location of an accumulator in a system.

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