17
The venting system should be designed to
have the minimum number of elbows or turns.
All horizontal runs shall be sloped upwards from
the furnace at 1/4 inch per running foot of vent.
Supports for the vent pipe must be installed a
minimum of every five feet along the vent run to
ensure no displacement after installation.
Under no circumstances shall any portion of
the vent system extend into or pass through
any return air duct, supply air duct, or plenum.
If the furnace is operated with blocked or
restricted venting, the blocked vent switch
located in the vent plate will open, turning off the
gas supply to the burners. The blocked vent
switch is a manually reset device. DO NOT
install a jumper wire across this switch to defeat
its function. DO NOT reset the switch without
identifying and correcting the fault condition
which caused the switch to trip. If this switch
must be replaced, use only the part specified in
the Replacement Parts List.
! WARNING:
Upon completion of the furnace installa-
tion, carefully inspect the entire flue sys-
tem both inside and outside the furnace
to assure it is properly sealed. Leaks in
the flue system can result in serious
personal injury or death due to exposure
of flue products, including carbon mon-
oxide.
Category III: Horizontal Venting
NOTE:
The reduced NOx models (eighth
character N) are not approved as a Cat-
egory III (Category III) furnace for use with
horizontal venting.
The furnaces are approved for use with 3"
single wall AL29-4C stainless steel vent
pipe in horizontal vent applications. This
pipe is available from the following manufac-
turers:
Z-FLEX Inc.
- vent brand name
(Z-VENT)
Heat-fab Inc.
- vent brand name
(Saf-T Vent)
Flex-L International
- vent brand name
(Star-
34 Vent)
This vent pipe must be used for the entire length
of the vent run. The installation must be in
accordance with all instructions supplied by the
vent manufacturer for use on Category III
appliances. When venting horizontal, this is
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 as-
sembly 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.
NOTE:
No bleed tube is required for the *RA
045(C,N)-08 model.
Horizontal Venting For Upflow Models:
1. Remove the rubber tubing from the pressure
switch sensor tube and the collector pan sen-
sor 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 sen-
sor tube. (See Figure 14.)
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
15.)
3. Bypass the vent switch by removing both wires
from the vent switch and attaching them to the
wire nut. (See Figure 16.)
Figure 14. *TA Bleed Tube Installation
Collector
Pan
Pre
ss
ure
S
witch
S
en
s
or
Tube
s
Bleed Tube
Содержание TA-060C-08A
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