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Use the following guidelines to determine the actuator quantity and
torque requirements for your damper configuration.
Determine Damper Actuator Locations
Use the following configuration to determine the amount of
actuator locations your damper will require.
Single Section ≤ 48 x 74 D2, D3
≤ 60 x 74 D1
Dampers will never ship more than 2 sections wide and one
section high.
Configuration
A single section damper will have one actuator location.
A damper that is ≥ 48 x 74 ≤ 96 x 74 will have one actuator
location. This is a two section damper jackshafted together.
A damper that is ≥ 96 x 74 ≤ 144 x 74 will have two actuator
locations. This is a two section damper jackshafted together and a
single section damper.
Exception: 3 section wide ≤ 42 SFT damper will have one actuator
location.
If damper exceeds 74” height a second row is necessary. Apply
same logic above to each row of dampers.
For dampers larger than 144 x 144, please contact the Take-Off
Service (takeoff.service@honeywell.com) for a quote and actuator
location.
Mounting
Internal Mount: Blade drive lever bracket provided only. Customer
is responsible for providing mounting hardware.
External Mount: Actuator shaft will be provided as extension pin kit
to be mounted on side or with jackshaft pre-mounted on damper.
Damper And Actuator Sizing
Determining Damper Actuator Torque
Requirements
Use the following procedure to determine the required torque for
your damper.
NOTE: Damper area is measured using the H and W dimensions.
H
W
M20587
Measuring Damper Area
1. Calculate the damper area in square feet by multiplying the H
dimension by the W dimension.
2. Multiply the damper area by the lb-in. per square foot value
from Table 2 on page 9.
NOTE: The minimum lb-in. per square foot value that can
accommodate tight closeoff and no leakage applications is 5,
regardless of the value shown in the table.
3. Select the highest actuator torque value than the calculated
value.
EXAMPLE:
Low leakage, parallel blade damper:
H dimension = 48 in.
W dimension = 96 in.
Static pressure (in. w.c.) = 2 in. w.c.
Face Velocity = 1000 fpm
48 in. x 96 in. ÷ 144 = 32 sq. ft.
32 sq. ft. x 7 lb-in./sq. ft. = 244 lb-in.
where 7 lb-in./sq. ft = value from Table 2.
In this case you would need an actuator with a minimum nominal
torque of 224 lb-in.