LG GEN2 Series Installation And Operation Manual page 51

Start-Up
Optional Frost Control
The microprocessor controller will output a signal when
wheel frosting is occurring which is determined by a
temperature set point (EA < 36°F, adjustable).
• Modulating wheel frost control: When frosting is
occurring, the wheel VFD will modulate the wheel
speed to maintain 36°F exhaust air temperature.
The VFD will be fully programmed at the factory.
• Modulating wheel with electric preheat frost
control: When frosting is occurring, the wheel VFD
will modulate the wheel speed to maintain 36°F
exhaust air temperature. The electric preheater
will energize when the outdoor air temperature is
below 10°F. The VFD will be fully programmed at the
factory.
Maintenance
WARNING
Whenever performing maintenance or
inspections, always disconnect the power
source.
Inspection
The wheel should be inspected in accordance with
the maintenance schedule. Maintenance of the wheel
consists mainly of inspecting the wheel for cleanliness
and then checking the drive motor, belt, and pulley for
wear. If the wheel appears dirty, the wheel should be
cleaned.
The wheel rotates through two airstreams moving in
opposite directions, which means the wheel is self-
cleaning up to a point. If the wheel media collects a
layer of smoke residue or an oil film, the energy transfer
efficiency drops.
The main factor in the frequency of cleaning is the
cleanliness of the air. If air filters are not changed
frequently, the wheel will collect contaminants and will
then have to be cleaned.
Cleaning
Accumulation of dust or particles on the surface of
the wheel can typically be vacuumed, purged with
compressed air, or wiped from the surface. In cases
when a more thorough cleaning is required, use the
following procedure.
Liberally spray 409 cleaner onto a small section of the
dirty side of the energy wheel, letting it foam to soften
debris and residue. Blow approximately 90 psi of
compressed air and from the opposite side of the wheel,
catching the blown-off material on pre-placed drop
cloths. Lightly sweep a soft sash paint brush across
the face of the wheel to remove any leftover residue. A
SLIGHT CLEANER SMELL MAY BE PRESENT FOR A
SHORT TIME AFTER THE UNIT IS TURNED BACK ON.
THIS SMELL WILL DISSIPATE QUICKLY.
Wheel Belt
Inspect belts each time filters are replaced. Belts
that look chewed up or are leaving belt dust near the
motor pulley may indicate a problem with the wheel.
Be sure to inspect wheel for smooth and unrestricted
rotation. If a belt requires replacement, contact the
local manufacturer representative. Instructions for
replacement will ship with the new belt.
Wheel Bearing
In the unlikely event that a wheel bearing fails, contact
the local manufacturer's representative for detailed
instructions.