92
Soak in the solution until grease and tar
deposits are loosened (Note: some staining of
the desiccant may remain and is not harmful
to performance). Before removing, rapidly
run finger across surface of segment to
separate polymer strips for better cleaning
action. Rinse dirty solution from segment and
remove excess water before reinstalling in
wheel.
Energy Recovery Wheel Defrost Timer
Setting
Set Mode to D
T1 is the on time
Set T1 range to 10m (10 minutes)
The scale should show 0-6 on the dial
Set T1 dial to 3 which equals 30
minutes of run time
T2 is the off time
Set T2 range to 1m (1 minute)
The scale should show 0-6 on the dial
Set T2 dial to 2 which equals 2
minutes of off time
Adjust temperature dial to set the point at
which any temperature below will activate
the defrost timer. Recommended setting is
35°F.
Once the OA Temperature goes below the
setpoint, the wheel timer will stop for 2
minutes and run for 30 minutes and will
continue to cycle at this rate as long as OA
Temperature is below setpoint. If more off
time is required to defrost the wheel, increase
the T2 Knob time to a greater off time than 2
minutes.
Figure 52 - Defrost Timer
Figure 53 - Temperature Dial
Gas or Electric Heating
The unit is designed to heat a given amount
of air while operating. If this amount of air is
greatly reduced, approximately 1/3 during
the heating season, the gas heat exchanger or
electric heating coil may overheat, and may
cut the burner or heater off entirely by action
of the safety high temperature limit devices
which are factory mounted at the heat
exchanger and supply fan areas.
Adjust airflow after installation to obtain an
air temperature rise within the range
specified on the unit rating plate at the
required external static pressure.
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