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Maximum line pressure at the main gas pressure regulator (unless specified otherwise on gas piping
schematic):
Natural gas:
VFB-3 through VFB-50
1/2 PSI
VFB-75 and up
1 PSI
Liquid propane:
All Units
10 PSIG
STEAM REACTIVATION CONTROLS:
Many types of steam control devices may be supplied with the dehumidifier. Some installations require
only that the hand valves be used to control the steam volume. If modulating steam valves are supplied with
the dryer, a thermostat is used to modulate the volume based on the reactivation entering temperature. In all
cases consult the piping schematic and dehumidifier set-up sheet or flow schematic included with this manual
for the control scheme and proper reactivation temperature.
AIRFLOW
The VFB dehumidifier uses two distinct air streams positively sealed from each other. This eliminates
the requirement to "balance" the air streams. It is recommended that the pressure gauges supplied with the
dryer be used to establish the proper air flows through the dehumidifier. The pressure differential across the
desiccant media is a simple way of determining the proper air volumes.
Adjust pressure values to that shown on the dehumidifier set-up sheet or flow schematic provided with
the unit.
BRYSORB PLUS DESICCANT MEDIA ROTATION
A fixed speed gear motor and pulley accomplish the desiccant media rotation. No adjustment is
required.
