Optional Energy Wheel
Start-Up
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Drive Belt
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the directional arrow and data information shown in the
image.
Adjust the Air Seals
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Disconnect the wiring to the wheel module and pull
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misalignment.
There is a perimeter seal located around the outside of
the wheel and a diameter seal across the face of the
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seals are secure and in good condition.
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on the paper. Tighten the screws, repeat the steps on
the other set of seals.
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Sequence of Operation
Optional Economizer
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t
Stop Wheel:
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and there is a signal for cooling, the wheel will stop
rotating to allow free cooling.
t
Idle Wheel:
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there is a signal for cooling, the wheel will rotate at
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wheel.
t
Modulate Wheel:
When economizer mode is
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wheel VFD modulates wheel speed to maintain the
discharge temperature set point.
Optional Frost Control
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output a signal when wheel frosting is occurring which
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2
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increase.
t
Preheat:
When frosting is occurring, the preheater
is energized to defrost the wheel. Once the pressure
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t
Timed Exhaust:
When frosting is occurring, the
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shall continue to run, allowing the warm exhaust
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operation.
t
Modulating Wheel:
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to the thermostat and pressure sensor. When
modulating wheel frost control is initiated, the VFD
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exhaust air condition from reaching saturation, thus,
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air temperature is greater than the frost threshold
temperature OR the pressure differential is less
than the set point, the wheel will run at full speed.
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is greater than the set point, the wheel will run at
reduced speed until the pressure differential falls
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Alarms Indication
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t
Wheel Rotation Alarm:
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activate an alarm.
Drive Belt
Adjustable
Air Seals
Label
showing
cassette
serial # and
date code
Bearing
Support
Drive Pulley
Retaining
Screws
18
Packaged Rooftop Ventilator
®
