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Bearings
Bearings are the most critical moving part of the fan and
should be inspected at periodic intervals. Locking collars and
set screws, in addition to fasteners attaching the bearings to
the bearing plate, must be checked for tightness. In a clean
environment and temperatures above 32°F/below 200°F,
fan shaft bearings with grease fittings should be lubricated
semiannually using a high quality lithium based grease. If
unusual environmental conditions exist temperatures below
32°F/above 200°F, moisture or contaminants, more frequent
lubrication is required.
With the unit running, add grease very slowly with a manual
grease gun until a slight bead of grease forms at the seal.
Be careful not to unseat the seal by over lubricating or using
excessive pressure. Bearings without grease fittings are
lubricated for life.
Lubrication
Refer to
Motor Bearings on page 109
Many fractional horsepower motors installed on the smaller fans
are lubricated for life and require no further attention. Motors
equipped with oil holes should be oiled in accordance with the
manufacturer's instructions printed on the motor. Use a high
grade SAE 20 machine oil and use caution not to over lubricate.
Motors supplied with grease fittings should be greased
according to directions printed on the motor.
Removal of Dust/Dirt
Thoroughly clean the exterior surface of the motor, fan panel,
and entire propeller periodically. Dirt can clog cooling openings
on motor housings, contaminate bearing lubricant, and
collect on propeller blades causing severe imbalance if left
unchecked. Use caution and do not allow water or solvents to
enter the motor or bearings. Under no circumstances should
motors or bearings be sprayed with steam or water.
IM 926-3 • ROOFPAK APPLIED SYSTEMS
for bearing lubrication.
Ultraviolet Lights Option
UVC exposure is harmful to the skin and eyes. Looking at
an illuminated bulb can cause permanent blindness. Skin
exposure to UVC can cause cancer. Always disconnect power
to unit before servicing. Do not operate if disconnect switch
has been disabled.
When this option is employed, ultraviolet C light bathes
the moist surfaces on the coil and drain pan, killing most
microorganisms that can grow there.
Typically, ultraviolet lights are installed on the leaving side of
the cooling coils in the unit. Each light module is mounted on a
rail and is removable for convenient bulb replacement.
UV Light Power Disconnect switches (two per door) are factory
installed on every door that allows a direct line of sight to the
UV lamps when opened. These switches are designed to
prevent UV exposure when cabinet doors are opened and
must not be disabled.
A viewing window near the UV lights allows viewing to
determine if the lights are energized. The viewing windows use
specially designed glass that blocks harmful UV light.
Ultraviolet Light Operation
Refer to the wiring schematic. 115 V (AC) power for the UV
lights is provided by control circuit transformer T1. The lights
operate whenever the unit is powered, system switch S1 is
closed, and all doors with door power disconnect switches are
closed. To turn the lights off, disconnect power to the entire
unit, or open system switch S1.
The normally open disconnect switches are wired in series in
a circuit that supplies 24 V (AC) to the coil of relay R45. When
all doors are closed, relay R45 is energized, and its normally
open contacts (in series with system switch S1) provide 115 V
(AC) to the UV lights.
Figure 112: Typical Ultraviolet Light Installation
Cooling
Coil
View
Window
94
Unit Options
WARNING
Light Power
Disconnect
Switch
Ultraviolet
Light
Units
AIRFLOW
Light Power
Disconnect
Switch
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