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Motorized Combustion Air Dampers
Patterson-Kelley recommends, and most
installation codes require, the use of motorized
combustion air dampers with end limit switches
installed in the combustion air intake ductwork
upstream of each appliance. This damper isolates
the combustion air supply when the appliance is in
standby. Once the appliance receives a call for
heat, the motorized combustion air damper opens,
and the end limit switch must close before the
appliance can proceed to ignition. Patterson-
Kelley offers motorized combustion air dampers
with built-in end limits switches for sale, which are
summarized in the table below:
Table of Recommended Motorized Combustion Air Dampers
Combustion
Air Ductwork
Size
10"
12"
14"
16"
For correct installation of a
vent system, read all of these
instructions and refer to the
vent manufacturer's
instructions.
Failure to use a proper vent
system (types and materials)
as described in this manual
will void the appliance
warranty and may result in
rapid deterioration of the
venting system, creating a
health or life safety hazard.
Faulty vent installation can
allow toxic fumes to be
released into living areas.
This may cause property
damage, injury, or death
on 120 VAC and feature a built in end limit switch which must be wired to the appliances' Air Damper
Interlock circuit. Upon a call for heat, the boiler's Air Damper Relay energizes, which drives the damper
motor open. Once the damper reaches the fully-open position, the end limit switch makes contact and
closes the Air Damper Interlock circuit, allowing the appliance to proceed to ignition. The diagram on
the next page shows the wiring necessary to install the normally-closed motorized damper
Revised: February 2, 2024
Released: February 2, 2024
Normally-Closed
Motorized
A
Damper
10-0490-6945
10"
10-0490-6946
12"
10-0490-6989
14"
10-0510-3120
16"
NOTE: The power source to drive the damper actuator motor must
be provided externally. The appliance DOES NOT provide a
power source for this purpose.
NOTE: Combustion air dampers other than those listed in the table
above may require voltages other than 120VAC. This is
acceptable, provided the required voltage does not
120VAC.
NOTE:
Damper must be in open position when appliance main
burner(s) is operating.
Le register est tenu de demeurer ouvert lorsque le brûleur principal
de l'appareil fonctionne.
NOTE:
The Air Damper Interlock circuit for the end limit switch is
always 120VAC which is sourced from the appliance itself. All end
limit switches must be rated for 120VAC.
These normally-closed motorized combustion air dampers operate
Patterson-Kelley 2024
All Rights Reserved.
®
P-K Storm
Technical Service 1.877.728.5351
B
C
D
10"
13"
3.38"
12"
15"
4.38"
14"
17"
5.5"
16"
22"
7.9"
2691000403 P-K Storm ST2500-ST8000
Installation and Owners Manual Rev G.docx
Gas Fired Boiler
exceed
Page 29
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