Daikin RoofPak RPS Series Installation And Maintenance Manual page 55

Adjusting Spring Mounts
Do no use impact tools for field spring mount adjustments as
damage to bits or to the bolt slot may occur.
Moving machinery hazard. Can cause severe injury or
death Start the fans for the first time according to the
Check, Test, and Start Procedures on page
is not done, equipment damage, severe personal injury, or
death can occur.
To adjust spring mount compression, perform the following:
1. Loosen the 0.625-18 UNF hex nut.
2. Place additional weight on the fan sled frame and use
a lever to slightly compress the spring or raise the sled.
This will allow the bolt to turn freely.
3. Place one or two drops of oil on the threads if needed.
NOTE: The greatest friction that makes adjustment
difficult, comes from the surfaces of the top of the
upperrebound plate, both sides of the 0.615" washer,
and the undersid of the sled. If friction is occuring
at these point, relieve the weight and oil the friction
surfaces.
4. Use a flat blade socket drill bit (1/2" drive handle
recommended) and make sure that when adjusting the
slotted bolt, that the upper-rebound plate also turns. This
action allows the bolt to push the compression plate up
or down with the lease friction occuring between the
0.625" washer and the underside of the channel.
NOTE: If the spring compresses to far, lift the sled before
turning. If the spring does not compress enough,
place weight on the sled corner, forcing it down
before turning.
5. Re-adjust the position of the lower-rebound plate so that
the sled has at least 3/4" travel and not more than 1.25"
of travel.
Relief Damper Tie-Down
Economizer sections with a 30" or 40" return fan have a relief
damper that is tied down for shipping. Remove the two brackets
and two screws before operation to allow free movement of
dampers. Access is from inside the economizer section.
www.DaikinApplied.com
CAUTION
WARNING
96. If this
Adjusting Scroll Dampers
Two sets of scroll dampers are provided in the housing of
the twin 15" × 6" supply fan to allow control of air volume to
each fan wheel. At the factory, these dampers are fully closed,
unrestricting airflow. If fan paralleling occurs, correct it by
loosening the adjustment screw on top of the fan housing (see
Figure 78) and slightly lowering the rod until air distribution
between the fans is even.
Figure 78: Scroll Damper Adjustment
Adjustment assembly
55 IM 926-3 • ROOFPAK APPLIED SYSTEMS
Preparing Unit for Operation
Scroll damper