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Fan Prestarting Checks
Check all fasteners and set screws for tightness. This is
especially important for bearing set screws.
The propeller should rotate freely and not rub on the fan
panel venturi. Rotation direction of the propeller should be
checked by momentarily turning the unit on. Rotation should
be in the same direction as the rotation decal affixed to
the unit or as shown in
Figure 42 on page
phase installations, fan rotation can be reversed by simply
interchanging any two of the three electrical leads.
Fan Maintenance
Once the fan is put into operation, set up a periodic
maintenance program to preserve the reliability and
performance of the fan. Items to include in this program are:
• Bearings
• Fasteners
• Setscrews
• Lubrication
• Removal of Dust/Dirt
Damper Counterbalance Adjustment
The following instructions should be followed when attempting
to maximize the counterbalance effect on the dampers. Be
aware that when the balance setting is highly sensitive, friction
wear and contamination will have an adverse effect to the
operation of the damper. The sensitivity of the counterbalance
should only be set to meet the application requirements. The
damper must be mounted square and plumb and operate freely
before any weight adjustments are performed.
Figure 48: Typical Ultraviolet Light Wiring Schematic
IM 1287 • REBEL APPLIED ROOFTOP
Ultraviolet Lights Option
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
vertical rail and is removable for convenient bulb replacement.
39. For three-
UV Light Power Disconnect switches (one 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.
Figure 47: Typical Ultraviolet Light Installation
Ultraviolet Light Operation
The Ultraviolet (UV) Lights are powered by the main 115V
transformer and therefore will normally be on whenever the unit
is powered on. There are door switches that are installed on
some doors with access to UV radiation. These doors must be
closed for the UV lights to operate. If any one of these doors
are opened, the UV lights will lose power and turn off. When
entering the space where there may be UV light, ensure the
UV lights are off by removing power from the unit by turning off
the main power disconnect(s). Refer to
control schematic. Always refer to the Unit Specific Electrical
Schematics for information regarding the number of door
switches present.
40
Unit Operation
Figure 45
for UV Light
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