Duct Connections
Use flexible connectors on the outlet and inlet duct connections
of all units . Each zone divider has a W-shaped duct clip . Insert
ductwork into this clip (
Figure 30
) .
Figure 30: Duct Connectors
NOTE:
Before connecting to ductwork, refer to Multizone
Damper Adjustment below.
Multizone Damper Adjustment
The installer must clear the damper assemblies of construction
dirt and debris . These materials result in higher torque
requirements and may bend or damage damper components .
Before you begin:
1 . Verify that dampers are square and operating smoothly
before ducting .
2 .
Install duct access panels on the downstream damper for
inspection and maintenance .
If multizone dampers do not close properly, adjust the blades
as follows:
1 .
Loosen set screws in bell arms for all zones.
2 . Close all cold deck dampers tightly .
3 . Move bell arms so they are at a 45° angle to the vertical
center when viewing the zone dampers from the cold
deck end of the damper section (
Figure 31
) .
a .
Two-deck zone dampers—The cold deck closes
when the bell arms are 45° from the vertical center.
The hot deck closes when the bell arms are 45°
clockwise from the vertical center.
b . Three-deck zone dampers—The cold deck closes
when the bell arms are 45° clockwise from the
vertical center. The hot deck closes when the bell
arms are 45° counterclockwise from the vertical
center .
4 .
Tighten set screws on bell arms while holding the
dampers closed .
5 . All zone damper blades should close properly . If one or a
few zones do not close completely, repeat the procedure
for these zones .
Figure 31: Bell Arms at 45° Angle to Vertical Center
To divide the damper section into multiple zones, cut and remove sufficient connecting link to
allow adjacent zones to operate independently.
NOTE:
The damper blades on two-deck dampers seal through several degreesof shaft
rotation .The damper blades can rotate 360° and do not engage a stop .The hot deck
blades are mounted at a 90° to the cold deck blades . Beforeinstalling the zone duct,
set up linkages and dampers and adjust . If adjustmentis required and access to the
blades is restricted, observe the cold deck bladeposition by removing the cabinet
panel on the coil section .
M
eChanICal
I
nsTallaTIon
www.DaikinApplied.com
17
IM 672-11 • VISION AIR HANDLING UNIT
