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The 7/8" diameter hole for the electrical conduit can
be located in three different locations in the top cap
depending upon which furnace model that the vent
adapter is being applied. The three locations are
labeled A, B, and C on the Vent Adapter Kit Conduit
Placement Template included with the kit.
Location A is for EL280UH and SL280UH models
with the following gas inputs: 070, 110, 135 and
SL280UH090V60C
NOTE − 80AF1UH and ML180UH models cannot
use location A or the flange on the upper access
door will interfere with the electrical conduit on
the vent adapter.
Location B is for 80AF1UH, ML180UH models with
the following gas inputs: 045, 070, 110 and 135.
Location C is for 80AF1UH and ML180UH with 090
gas inputs and EL280UH and SL280UH models that
are
in
B−size
cabinets:
EL280UH090P48B,
SL280UH090V48B (see figure 4)
NOTE − The louvers in the top cap on B−size
cabinets will interfere with the electrical conduit
on vent adapter if locations A and B are used.
Make sure there is clearance to evaporator coil.
3 − Position the vent adapter assembly on the furnace
flue transition as shown in figure 4 (location C).
VENT ADAPTER ASSEMBLY INSTALLATION
(B−Size Cabinet Shown)
CONDUIT
FIGURE 4
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.
EL280UH090P36B,
SL280UH090V36B
and
TYPE B
DOUBLE−WALLED
VENT PIPE
VENT ADAPTER
ASSEMBLY
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.
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
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.
VENT ADAPTER
ASSEMBLY
(with blocked vent
switch)
WIRE WITH 1/4"
FEMALE 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.
Page 7
WARNING
air
proving
pressure
FIELD WIRING
WIRE WITH 1/4"
MALE QUICK
PURPLE WIRE
PURPLE WIRE
DISCONNECT
FROM PRESSURE
SWITCH
FIGURE 5
switch.
CONNECT
TERMINAL
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