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Startup Checks
WARNING
ROTATING FAN
Can cause severe injury or death . Before servicing fans,lockout
and tag out power.
WARNING
FIRE/ELECTRIC SHOCK HAZARD
Can cause property damage, personal injury or death . Wire
fan power supply and ground motor frame in accordance with
local electric codes .
WARNING
Fan motor requires overload protection .
Failure to provide motor overload protection can result in
fire,property damage, electric shock, personal injury, or
death . Connect motor to an overload protective device rated
incompliance with local electric codes.
CAUTION
DO NOT OVERHEAT FAN MOTOR
High air temperatures in the fan section can cause the fan
motor to burnout. On draw-through air handlers or air handlers
with the fan section down the air stream from the heating
section, the discharge air temperature of the heating section
must not exceed 104°F (40°C) .
When performing startup and service, always take thorough
safety precautions . Only trained, experienced personnel should
perform these functions .
Before Starting the Unit
CAUTION
Equipment damage due to loose fasteners represents
improper start-up and equipment abuse . It is not covered by
the warranty.
Before entering fan section, make sure that fan electrical power
source is disconnected and locked in the OFF position .
1 . Check that the unit is completely and properly installed
with ductwork connected.
2 .
Check that all constru tion debris is removed and filters
are clean .
3 .
Check that all electrical work is complete and properly
terminated .
4 . Check that all electrical connections are tight and that
the proper voltage is connected . Phase imbalance must
not exceed 2% .
5 . Do not grease ball bearings on the fan shaft and motor
before startup . They are prelubricated .
6 .
Check tightness of crews in bearings and fan wheel(s).
If retightening is needed, position the fan wheel(s) per
Table 7, page 29
through
Table 9, page 30
and
Table 10
through
Table 12, page 31
. Torque set
screws per
Table 13
and
, page 31
.
7 . Check alignment of fan and motor sheaves and belt
tension . Adjust if necessary . Check tightness of sheave
setscrews and/or capscrews (refer to
, page 31
) .
8 . Leak test the thermal system to verify that connections
are tight .
9 . Check that the condensate drain is trapped .
10 . Rotate the shaft by hand to be sure it is free .
11 .
If multiple fans are supplied with a block off plate and it is
installed on one of the fans, make sure to only start the
fans without the block off plate. Do not start any fan that
has the block off plate installed on it .
12 .
If multiple fans are supplied with isolation dampers, make
sure the isolation dampers are fully open before starting
the fans .
IM 672-11 • VISION AIR HANDLING UNIT 28
www.DaikinApplied.com
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