IM 782-12 • DESTINY AIR HANDLERS 44 www.DaikinApplied.com
Operation Guidelines
Operation Guidelines
Startup Checks
WARNING
ROTATING FAN
Can cause severe injury or death. Before servicing fans, lockout and tag
out power.
DANGER
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.
DANGER
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 in compliance with local electric codes.
WARNING
DO NOT OVERHEAT FAN MOTOR
High air temperatures 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).
CAUTION
Cautions indicate potentially hazardous situations, which can result in
personal injury or equipment damage if not avoided.
When performing startup and service, always take thorough
safety precautions. Start-up functions must be performed by
trained, experienced personnel.
Before Starting the Unit
Make sure that fan electrical power source is disconnected and
locked in the OFF position before entering fan section.
1. With ductwork connected, check the unit for complete
and proper install tion.
2.
Check that all construction debris is removed and filters
are clean.
3. Check that all electrical work is complete and properly
terminated. Check that all electrical connections are
tight and that the proper voltage is connected. Phase
imbalance must not exceed 2%.
4. Ball bearings on fan shaft and motor are prelubricated
and do not need grease before startup.
5. Check tightness of setscrews in bearings and fan
wheel(s). If retightening is needed, make certain the fan
wheel(s) are aligned properly or setscrews are torqued
per
6. Check alignment of fan and motor sheaves and belt
tension. Adjust if necessary. Check tightness of sheave
setscrews and/or capscrews. See
.
7. Leak test the thermal system to verify that connections
are tight.
8. Check that condensate drain is trapped.
9. Rotate shaft by hand to be sure it is free.
10. Fan startup: Fan should start and run. Observe the
rotation. If the fan is operating backward, reverse two
legs of the three-phase supply power.
NOTE:
Variable pitch fan drives are usually provided for
operation in the mid-speed adjustment range.
However, the drives usually ship with the adjustment
opened for minimum fan speed. Adjust the drives for
the proper airflow. Refer to
.
After first 48 hours of operation:
1. Disconnect and lockout electrical power source.
2. Check tightness of all bearing, wheel, and sheave
3. Recheck belt tension and adjust if necessary. Belts
tensioned sufficiently to slip one to two seconds at
startup will perform satisfactorily, extending life and
reducing vibration. If retensioning is necessary, be
certain to retain sheave alignment.
Table 32: Bearing Collar and Wheel Hub Setscrew Torque
Setscrew Diameter, in
Minimum torque, ft/lbs (kg/M
1/4
5.5 (0.76)
1/16
10.5 (1.45)
3/8
19.0 (2.63)
7/16
29.0 (4.01)