15
Figure 12. Bleed Tube Installation
Collector
Pan
Pressure
Switch
Cut
Sensor
Tubes
Bleed Tube
Bleed Tube
Orifice
Figure 14. Limit Circuit Wiring
Wire Nut
Switch
Limit
Switch
Flame
Roll-Out
Switch
Vent
Limit
Blue
Blue
Figure 13. Vent Collar Detail
Cover
Plate
Nut
Covered Vent
Collar Hole
Figure 15. Typical Horizontal Vent Installation
90
˚
Elbow
3" Dia. Loop
Outside
Wall
Wall Thimble
(For combustible
wall material)
Termination
Tee
Support
Tee
0-6'
Drain
Plug
1
/
4
" Per
Foot Rise
Locking Band
Locking
Band
defined as a Category III furnace, the vent pressure is
positive, and the venting system must be sealed in both
horizontal and vertical runs.
For horizontal venting installations in both the United
States and Canada the transition assembly must be modified
by adding a bleed tube to the pressure switch tube and
bypassing the vent switch. All model furnaces will require
Vent Kit #903196
for horizontal venting.
Horizontal Venting For Upflow Models:
1.
Remove the rubber tubing from the pressure switch
sensor tube and the collector pan sensor tube. Cut
1/2 inch from one end of the rubber sensor tube, fold
in half and cut along the bend line. Discard the 1/2
inch long piece of tubing. Select the correct bleed
tube using the table supplied with vent kit #903196
and place the other two pieces of tubing on both ends
of the bleed tube. Do not cover the hole in the bleed
tube. Place the assembly back on the pressure
switch sensor tube and the collector pan sensor
tube. (See Figure 12.)
2.
Remove the nut and restrictor plate from the vent
collar assembly and discard the restrictor plate.
Select the appropriate dilution cover plate as noted
with vent kit #903196. Fit the clearance hole in the
cover plate over the weld stud. The cover plate must
cover the hole(s) on the vent collar assembly.
Tighten the nut securely while holding the cover plate
in position. (See Figure 13.)
3.
Bypass the vent switch by removing both wires from
the vent switch and attaching them to the wire nut.
(See Figure 14.)
!
CAUTION:
Do not drill holes through the vent pipe or fittings
on a horizontal vented furnace. Do not use sheet
metal screws, or rivets. Drilling, screws, or
rivets will cause leaks.
The components of the horizontal vent system must not be
penetrated with screws, rivets, or other devices, either
when joining pipes and fittings or using support straps. All
joints must be sealed with high temperature silicone before
locking bands are installed. If the lengths of pipe must be
cut, the joint must still be sealed with silicone and the
locking band used. When installing the condensate tube be
sure to form a trap by means of a 3" loop filled with water.
(See Figure 15.)
Horizontal Venting: *RK Models:
1. By-pass the vent switch, located on blower compart-
ment door, by removing both wires from the switch.
Remove wire terminals, strip wires and tie together in a
wire nut. (See Figure 16.)
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