GRW
Maintenance
19
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GRW - Manual
Start-up Instructions
WARNING
Electric Shock Hazard
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lookout/
tagout procedures to ensure the power cannot be
inadvertently energized. Failure to disconnect power
before servicing could result in death or serious injury.
WARNING
Hazardous Service Procedures
During installation, testing, servicing and
troubleshooting of this product it may be necessary
to work with live electrical components and moving
mechanical compontents. Have a qualified technician
who has been properly trained in handling live
electrical components perform these tasks. Failure to
follow all eletrical safety precautions when exposed to
live electrical and mechanical components could result
in death or serious injury.
Pre-Start-Up Checklist
Prior to starting up the unit, make sure the following work
is complete:
Task
Complete
General
All steps in installation check list are complete.
Fan Inspection
Shipping bolts (under fan isolators) and materials have
been removed from the unit. Manually rotate fans and
confirm they move freely.
All bearing, drive, and blower set-screws have been
checked for tightness.
Electrical
Electrical power is acceptable (see below).
Prior to powering the unit, it is crucial to check the
incoming electrical power:
1. Check that the electrical power matches what is stated
on the nameplate.
2. Check that the voltage on each leg is within the stated
voltage range and/or does not deviate in excess of 10%
of name plate value.
3. Check that the voltage difference between all three
phases is within 2%.
If any of these conditions are not met, do not continue
commissioning the unit. Arrange to have the power issue
resolved.
Fan Start-up
WARNING
Hazardous ROTATING EQUIPMENT
Contact with the rotating fan, belts or motor can
lead to death or sever injury. Follow proper lockout/
tag-out procedures to ensure the power cannot be
inadvertently energized.
Once the power has been checked, proper fan rotation
must be confirmed:
1. Turn on the disconnect.
2. Select “off” for the system switch.
3. Depress the supply fan contactor manually for a
moment to check the fan rotation. There is typically an
arrow on the fan housing to indicate rotation direction.
4. If the fan rotation is not correct, shut down the unit
and turn off the power. Switch any two of the power
leads at the load side of the disconnect.
5. Check the fan motor amp draw and compare it to the
name pate rating. If amp draw is too high, correct the
air flow and/or duct static pressure drop to reduce
amp draw. If the fan speed is adjusted, make sure not
to exceed the maximum fan speed rating.
6. The fan thermal overloads must be set to the
appropriate motor performance after all adjustments
have been made.
