Energy Wheel
Start-Up
If selected, the energy wheel is installed in the unit’s airstream with one half of the wheel in the intake airstream and one half in the exhaust airstream. Air leakage between the two airstreams has to be kept to a minimum and the wheel has air seals that must be adjusted for that purpose. The seals must be adjusted at time of
Bearing Support
Adjustable
Air Seals
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| cassette serial number | |
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| and date code |
Drive Belt |
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Drive Pulley |
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Drive Belt |
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Inspect the drive belt. Make |
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sure the belt rides smoothly |
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in the pulley and around the |
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outside of the wheel. Note |
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the directional arrow and |
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data information shown in the |
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image. | Motor Pulley and Belt | ||||||
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Adjust the Air Seals
The first step in wheel seal adjustment is to make sure the unit power supply is locked out. Disconnect the wiring to the wheel module and pull the wheel cassette out of the cabinet on its tracks. Large cassettes are not removable. Then slowly rotate the wheel by hand to make sure there is no binding or
misalignment. The wheel should rotate smoothly and should not bind.
should be a slight tug on the paper. Tighten the screws, repeat the steps on the other set of seals.
Push the wheel cassette back into the unit and plug in the power connector. Turn the main power supply back on and then observe the operation of the wheel by opening the wheel access door slightly. Remove filters if necessary to observe the wheel.
Sequence of Operation
Optional Economizer - The economizer will be locked out when: the outside air is <40°F (- 2°F hysteresis, adjustable); the unit is operating in dehumidification mode; or there is a call for heating.
•Stop Wheel: When economizer mode is enabled and there is a signal for cooling, the wheel will stop rotating to allow free cooling.
•Modulate Wheel: When economizer mode is enabled and there is a signal for cooling, the wheel VFD modulates wheel speed to maintain the discharge temperature set point.
Optional Frost Control - The DDC controller will output a signal when wheel frosting is occurring which is determined by a temperature set point (OA <5°F – 2°F hysterisis, adjustable) and wheel pressure drop increase.
•Preheat: When frosting is occurring, the preheater is energized to defrost the wheel. Once the pressure drop decreases below the set point, the preheater is
•Timed Exhaust: When frosting is occurring, the supply blower is cycled off. The exhaust blower shall continue to run, allowing the warm exhaust air to defrost the wheel. After the 10 minute cycle, the supply fan are
Alarms Indication - DDC shall have one digital output for remote indication of an alarm condition.
• Wheel Rotation Alarm: Monitors wheel rotation, |
There is a perimeter seal located around the outside of the wheel and a diameter seal across the face of the wheel on both sides. Check to make sure that all air seals are secure and in good condition.
Adjust the air seals by loosening all the air seal retaining screws on the bearing support (see image for reference). Using a piece of paper as a feeler gauge, adjust the seals so they almost touch the face of the wheel while tugging slightly on the paper. When the wheel is rotated, there
Retaining
Screws
Bearing Support Bar
showing air seal assembly
and sends a signal to controller (after a 15 second |
time delay with no rotation) that signals the DDC to |
activate an alarm. |
22Model
