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Repressurization takes place in a downward direction through the bed, minimizing desiccant
dusting.
C. TIMER OPERATION
The dryer’s control circuit board or mechanical timer controls the complete cycle. No field
adjustment of any kind is required for proper operation.
D. ADJUSTABLE PURGE FLOW SYSTEM
RH-Series Exhaust Purge Dryers feature an adjustable purge flow system. The purge flow
system consists of:
1. Purge Flow Adjustment Valve
2. Purge Flow Meter (Gauge)
3. Purge Orifice (Located in pipe union)
The purge flow system is located between the twin towers of the dryer and/or above the
control box. The function of the purge flow system is to regulate the amount of purge air
allowed to flow into and subsequently regenerate the off-line (0 PSIG) tower.
The purge air flow is controlled by adjusting the purge flow valve to a specific setting as
indicated on the purge flow meter (gauge). Once set, the purge flow adjusting valve in
conjunction with the purge orifice plate will allow a certain fixed purge air flow.
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