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Unless prohibited by local codes, it is permissible to
use a flexible corrugated metal gas connector for the
last section of gas piping connected to the furnace
gas valve. If a flexible connector is used, it must be
certified to be in compliance with ANSI Standard
Z21.24 or, in Canada, with Standard CAN1-6.10.
Following installation of the piping, first ensure that
the gas control lever or switch on the gas valve is in
the off position and then pressurize the system with
gas. Thoroughly check the piping system for leaks.
During pressure testing of the gas supply piping
system, observe the following to avoid fire, ex-
plosion, asphyxiation, or damage to the appli-
ance.
a. If test pressure is less than or equal to 1/2
psig (3.48 kPa)(14" W.C.), isolate the fur-
nace by closing its individual manual shutoff
valve.
b. If test pressure is greater than 1/2 psig (3.48
kPa)(14" W.C.), the furnace and its individ-
ual shutoff valve must be disconnected from
the gas supply system.
Never use an open flame to check for leaks.
Fire or explosion could occur. Since some leak
solutions, including soap and water, may cause
corrosion or stress cracking, the piping must be
rinsed with water after testing unless it has
been determined that the leak solution is non-
corrosive.
The maximum and minimum gas supply pressure
required at the inlet of the gas control valve is shown
on the unit rating plate. When the furnace is in
operation, the inlet pressure must be within the limits
shown.
VENTING (CATEGORY I)
This furnace is a fan-assisted Category I furnace
which operates with a non-positive vent static
pressure and has a flue loss of not less than 17
percent. It may be vented vertically using B-vent
(Category I) or it may be vented horizontally through
a sidewall by using an approved accessory power
venter. For sidewall venting, follow the instructions
accompanying the power venter and the additional
instructions in the section on sidewall venting
beginning on page 16.
The vent installation shall be in accordance with Part
7, Venting of Equipment, of the NATIONAL FUEL
GAS CODE, ANSI Z223.1, or applicable provisions
of the local building codes. In Canada, for more
information regarding vent design and installation,
refer to the latest edition of the CAN/CGA-B149
Installation Code.
1. This furnace must be connected to a factory built
chimney or vent complying with a recognized
standard, or a masonry or concrete chimney
lined with a lining material acceptable to the
authority having jurisdiction.
2. The vent material can be single wall or B-1 (type
B vent with one-inch clearance) for the first five
feet from the furnace. Beyond five feet it must be
B-1 or a permanent, lined chimney.
3. Maintain minimum six-inch clearance to com-
bustible material for single wall vent and one
inch clearance for B-1 vent.
4. When using listed B-1 vent materials and/or a
listed Manufactured chimney, they must be in-
stalled in accordance with the manufacturer’s
installation instructions and the terms of the list-
ing.
5. If horizontal vent pipe is required, it should be as
short as possible and pitch upward toward the
vertical riser or chimney inlet at least 1/4" per
foot to help insure proper venting.
6. Where two or more appliances are connected to
a common vent or flue, use the vent tables in the
venting booklet supplied with this furnace to de-
termine the proper vent connector size.
7. DO NOT USE dampers or restrictors in vent
piping or flue.
8. Vent pipe sections must be securely fastened
together and fastened to the furnace flue collar
using screws where required
9. Joints in the vent pipe must be securely made
and any horizontal run of the vent pipe must be
supported less than one support every three feet
to prevent sagging.
10. This furnace may be common vented with a
water heater or other gas-fired naturally vented
appliance.
This furnace must not be connected into any
portion of a mechanical draft system operating
under positive pressure
This furnace must not be connected to a chim-
ney flue serving a separate appliance designed
to burn solid fuel.
