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The 7/8" diameter hole for the electrical conduit can
be located in two different locations in the top cap
depending upon which furnace model that the vent
adapter is being applied. The two locations are
labeled I and II on the Vent Adapter Kit Conduit
Placement Template included with the kit.
Location I is for furnaces with A (14.5"), C (21.00" and
D (24.50") width cabinets. Location II is for furnaces
with B (17.50") width cabinets.
3 − Position the vent adapter assembly on the furnace
flue transition as shown in figure 4 (location II).
FIGURE 4
TYPE B
DOUBLE
−
WALLED
VENT PIPE
VENT ADAPTER
ASSEMBLY
CONDUIT
VENT ADAPTER ASSEMBLY INSTALLATION
(B
−
Size Cabinet Shown)
4 − Remove the locknut from the vent adapter assembly
conduit. Route the two wires through the 7/8" hole in the
furnace top cap. Use the locknut to secure the conduit
to the furnace top cap.
5 − Use three field−provided, self−drilling sheet metal
screws to firmly secure the vent adapter assembly to
the round collar of the unit flue transition. Drive one
self−drilling screw through the front and one through
each side of the vent adapter assembly and collar.
WARNING
Asphyxiation hazard. The vent adapter assembly
must be securely attached to the furnace flue tran-
sition and the vent pipe at all times.
6 − The vent adapter assembly includes a blocked vent
switch which must be wired into the furnace
combustion air proving pressure switch as shown in
figure 5. This manually reset switch interrupts unit
operation when the vent is blocked. The switch must
not be reset until vent blockage is cleared.
a − Remove one of the purple wires from the
combustion air proving pressure switch.
Connect this wire to the switch wire with the male
1/4" quick connect terminal.
b − Connect the switch wire with the female 1/4"
quick connect terminal to the open contact on the
combustion air proving pressure switch.
FIELD WIRING
FIGURE 5
VENT ADAPTER
ASSEMBLY
(with blocked vent
switch)
WIRE WITH 1/4"
FEMALE QUICK
CONNECT
TERMINAL
PURPLE WIRE
PURPLE WIRE
DISCONNECT
FROM PRESSURE
SWITCH
WIRE WITH 1/4"
MALE QUICK
CONNECT
TERMINAL
PRESSURE SWITCH
(Low pressure switch on
SL280UH models)
7 − Use three field−provided self−drilling screws to secure
the double−walled B−vent to the top of the vent adapter
assembly. Drive one self−drilling screw through the
front and one through each side. Route the vent to the
masonry chimney using the shortest possible route.
If an elbow is required to route the vent connector to
the chimney, it must be installed at least 1 ft. above the
furnace vent outlet. A 2 ft. clearance before the first
elbow is preferable. See figure 6.
