Desert Aire Aura QS Installation And Operation Manual page 78

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 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
System 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 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 receiver and/or condensers, recover remaining charge into separate refrigerant
cylinders approximate for the refrigerant being serviced. Carefully track the amount of refrigerant
charge removed as this exact amount should be placed into the unit when re-charging.
Repair / Component Replacement
• If any portion of the system was at a vacuum, place dry nitrogen in the system until atmosphere
pressure is reached.
• It is preferred that components are removed by heating the braze alloy to the re-melt temperature
and mechanically moving the component. When this is not possible due to proximity of cabinet
structure or other components, a tubing cutter can be used to remove sections of piping. Where
new tube is required for replacement, use dehydrated tube where possible. Use the same type of
fittings as original. Route the pipe in the exact manner as originally routed.
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Desert Aire - QS/QV Manual