22
ZONE DAMPERS
SIZING ZONE DAMPERS
WIRING ZONE DAMPERS
If the ductwork already exists, simply size the damper to fit the ductwork.
For new systems or retrofit jobs:
a) Determine CFM from heat gain or loss calculations.
b) Select damper size by using a duct sizing table or calculator.
c) Select a
Zonex Systems
damper to fit the duct size selected for that
zone.
DAMPER INSTALLATION NOTES
1. Do not exceed 700 FPM in a register/diffuser branch duct.
2. If a damper is installed within 3 feet of register/diffuser, install sound
attenuating flex duct between damper and outlet.
3. Zone dampers should be preceded by 2’-4’ of straight pipe where
possible.
4. In attic installations and high humidity areas, the
Zonex Systems
damper should be insulated along with the ductwork. The hat sec-
tion on the damper is delivered with insulation between the hat sec-
tion and pipe. Therefore, insulation should be applied to the round
pipe and be butted against the hat section, (do not insulate the
motor or relay board). Both motor and the relay board generate
enough heat so no condensation will develop on the hat section.
5. Remember to allow a 16” gap in the duct for Heavy Duty rectangular
dampers.
6. Low and Medium pressure rectangular dampers slide into a 3-1/4”
wide cutout in the side of the preexisting ductwork.
FIVE WIRE LINK TO
SYSTEM CONTROLLER
TO
THERMOSTAT
TB2
W
Y
R
C
RO
MC
RC
W
2
B
WY
G
R
d
TB1
W
2
Electronic stat
if applicable
OPEN MOTOR*
CLOSE MOTOR
*OPEN MOTOR NOT UTILIZED
ON LOW PRESSURE
(SPRING OPEN) DAMPERS.
For heavy-duty rectangular dampers:
CW = RC (Run Closed)
COM = MC (Motor Common)
CCW = RO (Run Open)
For heavy-duty round dampers:
CCW = RC (Run Closed)
COM = MC (Motor Common)
CW = RO (Run Open)
