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NOTE: Always check the system airflow before you troubleshoot the
5.4
Component Replacement, Charge, Evacuation, & Leak Instructions
Note that a new liquid line filter dryer will be required any time a refrigeration system is opened for
servicing. New dryer should be of the same capacity as the original or larger.
Recovery
When there has not been a major refrigeration system leak, the system will contain refrigerant. This
refrigerant must be either recovered to separate cylinders appropriate for the refrigerant type or
isolated in a portion of the refrigeration system that will not be open for service. In all cases you must
comply with Section 608 Refrigerant Recycling Rule of the Clean Air Act.
Recovery of Systems with a Refrigeration System Leak
As much refrigerant as possible must be recovered into separate refrigerant cylinders appropriate for
the refrigerant being serviced. System pressure near the leak site should be monitored closely to
ensure this area is not pulled to a vacuum. Isolated sections of the system as required and recover
independently to avoid refrigerant contamination. Uncontaminated refrigerant can be reused in the
refrigeration system it was recovered from.
Recovery of Systems without a Leak
Systems that do not have leaks, but still require refrigeration system service, may have charge
isolated in receivers and condensers if these particular components do not require direct service.
Desert Aire dehumidifiers have different receiver sizes depending on the model and size. Condenser
sizes and configurations may also vary. In general, larger receivers will come equipped with isolation
valves that will allow for a portion of the charge to be contained in the receiver during servicing. Units
equipped with remote condensers will have isolation valves located inside the unit cabinet near the
area where the connections are made.
The compressor can be used to move the refrigerant to the system components that will be used to
temporarily hold the charge. Note that cooling a condenser by running as many fans as possible
and/or cooling the coil surface with a stream of water can assist in storing charge.
The low side pressure should be monitored closely while using this procedure to store charge. Under
no circumstances should a compressor be allowed to run in a vacuum. When most of the refrigerant
is isolated in the condensers, recover remaining charge into separate refrigerant cylinders
•
Defrost mode suction temperature range: 30° to 100°F
•
Defrost mode discharge temperature range: 90° to 200°F
refrigeration circuit. (See Section 5.3.1 and 5.3.1.1)
41
Desert Aire - LW Manual
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