Component Installation
CLCH-SVX07K-EN 95
Multizone Section
Under certain operating conditions, condensation may
form on the cold deck portion of the multizone damper
section. To prevent this, insulate around the damper rods.
Be sure the insulation does not affect damper operation.
Zone Damper Operators
Zone damper operators are available factory-mounted
with factory-mounted controls or as a stand-alone end
device. If not factory-provided, the contractor is
responsible for providing these operators. In all cases, the
damper operator should be connected to the drive rod.
Adjusting Zone Dampers
Zone dampers should be installed and adjusted prior to
making duct connections, assuring proper setup of the
damper zones:
1. Check the damper blades to confirm they are not
binding. The blade should rotate 90 degrees.
2. Determine the number of zones required. The zone
damper is fitted with a linkage bar that connects all
damper zones.
3. Select the number of damper segments required for
the first zone.
4. Cut a section out of the damper linkage bar just after
the last lever in that zone.
Note: It may be necessary to remove the damper linkage
bar to cut it. To remove the linkage bar pry the “e”
rings from the blade axles and remove the bar.
5. Repeat steps 3 and 4 for the remaining zones.
6. Attach the damper operator drive rod to one blade axle
in each zone of each damper.
7. Use the self-drilling screws provided to mount the
bearing bracket assembly.
Note: The drive rod kits ship in a separate box, found in
the fan module or the cold deck of the multizone
module.
Actuator quick connects: For multizones with actuators,
connect actuator wiring quick connects located in raceway
boxes and attach conduit to unit with supplied conduit
clamps.
Duct Connections
All duct connections to the air handlers should be installed
in accordance with the standards of the National Fire
Protection Association (NFPA):
• NFPA 90A for installing air conditioning and ventilating
systems other than residence type.
• NFPA 90B for residence-type warm air heating and air-
conditioning systems.
See unit submittal documentation for additional duct
mounting information.
Fan Discharge Connections
To ensure the highest fan efficiency, duct turns and
transitions must be made carefully, minimizing air friction
losses and turbulence. Proper ductwork installation, as
outlined by such organizations as Sheet Metal and Air
Conditioning Contractors National Association, Inc.
(SMACNA), should be followed closely.
Indoor unit fan sections with rectangular or round
openings should have flanged ductwork attached to
bottom panel opening. When using lined ducts, the
insulation should not obstruct the discharge opening. For
plenum fan sections with bell mouth fittings, see “Bell
Mouth Discharge Connections,” p. 98.
Connections made directly to the discharge opening of a
housed fan should have a minimum of three fan diameters
of straight duct before any turns or transitions. The
ductwork should be the same size as the fan discharge
opening. The first turn of the connection should be in the
same direction as the fan rotation as shown in Figure 119.
The air that the fan discharges into the duct is extremely
turbulent and requires some length of duct to stabilize.
Abrupt changes in ductwork directly off the fan discharge
may adversely affect fan performance and acoustics.
Figure 118.Setting damper rods and damper linkage
Damper
linkage bar
Damper actuator
drive rod kit assy
X09050957001
Bearing bracket assy
79-020695-00B
Clip
85-002532-00B
Drive rod
85-002303-00B
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