3
MOUNTING POSITIONS OF PROBE &
PRESSURE SWITCH
DUCTWORK
VERTICAL
PRESSURE
SWITCH
TUBING
PROBE
(air flow arrow
pointing in
direction
of air flow)
AIR
FLOW
DUCTWORK
DUCTWORK
HORIZONTAL
PRESSURE
SWITCH
TUBING
PROBE
(air flow arrow
pointing in
direction
of air flow)
AIR
FLOW
DUCTWORK
MOUNT THE PROBE & PRESSURE SWITCH
PRESSURE
SWITCH
TUBING
PROBE
(air flow arrow
pointing in
direction
of air flow)
AIR
FLOW
DUCTWORK
GASKET
SHEET
METAL
SCREWS
Connect tubing
onto outside of
black fitting.
Drill
3/8” HOLE
in ducting
1/4”
SPADE
TERMINALS
Probe opening
pointing down
AIR
FLOW
LOW
VOLTAGE
WIRES
TUBE CONNECTED
TO GREY (-) INLET
PRESSURE SWITCH
SET UP FOR
EXTERNAL &
IN-LINE BLOWERS
1/4”
SPADE
TERMINALS
Probe opening
pointing down
AIR
FLOW
LOW
VOLTAGE
WIRES
TUBE CONNECTED
TO BLACK (+) INLET
PRESSURE SWITCH
SET UP FOR
INTERNAL BLOWERS
WIRE THE SYSTEM
BLACK (LINE)
WHITE (COMMON)
GREEN (GROUND)
MAKE-UP AIR DAMPER
TRANSFORMER
24V
PRESSURE
SWITCH
WIRING DIAGRAM
ONE DAMPER
24V
Wire the system as shown.
TEST THE SYSTEM
Once the damper, pressure switch, and probe is installed. Turn on the range hood to
high speed and confirm that the damper opens. Turn off the hood and check to see if
the damper closes.
A qualified HVAC contractor should also ensure the proper operation and venting of all
combustion equipment in the home.
FALSE TRIPPING
Under certain extreme conditions there could be false tripping of the damper (opening
when the range hood blower is off). If false tripping is encountered, place an in-line
backdraft damper (7” model no. 97, 8” model no. 438, 10” model no. 421) between the
probe and the roof or wall cap.
SERVICE PARTS
97018853 Pressure Switch Kit
97013273 24V Transformer
99527207 6” Motorized Damper
99527208 8” Motorized Damper
99528460 10” Motorized Damper
BLACK (LINE)
WHITE (COMMON)
GREEN (GROUND)
MAKE-UP AIR DAMPER
TRANSFORMER
24V
PRESSURE
SWITCH
WIRING DIAGRAM
MULTIPLE DAMPERS
MAKE-UP AIR DAMPER
24V
24V
24V
24V
20V
24V CONTACTS
TRANSFORMER WIRING
WIRE THE SYSTEM (Continued)
Regular maintenance is necessary to ensure the proper operation of the Damper system.
Failure to conduct such routine maintenance can jeopardize the ability of the Damper to
introduce fresh air into the home. Regular maintenance should include the following activi-
ties:
• Clean the outside bird screen to ensure it is free from debris and open to allow fresh air
to enter.
• Clean or replace the interior filter(s) which serve to filter fresh air before it enters the
home.
• Maintain a clear opening at the outdoor end cap, which means preventing the buildup of
snow, leaves, or vegetation at the end cap.
• During regular HVAC maintenance, have the mechanical contractor inspect the Damper
system for proper operation.
MAINTENANCE