Table of Contents
Advertisement
3.
Install air intake a minimum of 12² above maximum snow
level and clear of any obstruction. Duct or ventilation open-
ing requires one square inch of free area per 4,000 BTUH of
total input rating for all gas appliances in area.
4.
Air inlet MUST be screened with not less than
screen.
Unusually Tight Construction
In unconfined spaces, infiltration may be adequate to provide air
for combustion, ventilation and dilution of flue gases. However, in
buildings with unusually tight construction, additional air MUST be
provided using the methods described in section titled Confined
Space Installation:
Unusually tight construction is defined as: Construction with
1.
Walls and ceilings exposed to the outside have a continu-
ous, sealed vapor barrier. Openings are gasketed or sealed
and
2.
Doors and openable windows are weather stripped and
3.
Other openings are caulked or sealed. These include joints
around window and door frames, between sole plates and
floors, between wall--ceiling joints, between wall panels, at
penetrations for plumbing, electrical and gas lines, etc.
Ventilation Air
Some provincial codes and local municipalities require ventilation
or make--up air be brought into the conditioned space as replace-
ment air. Whichever method is used, the mixed return air tempera-
ture across the heat exchanger MUST not fall below 60°F or flue
gases will condense in the heat exchanger. This will shorten the life
of the heat exchanger and possibly void your warranty.
Venting and Combustion Air Check
NOTE: When an existing Category I furnace is removed or re-
placed, the original venting system may no longer be sized to prop-
erly vent the attached appliances, and to make sure there is
adequate combustion air for all appliances, MAKE THE FOLLOW-
ING CHECK.
Figure 6
Vent Check
Vent Pipe
Typical Gas
Water Heater
If flame pulls towards draft hood, this indicates sufficient
venting.
440 01 1020 02
1
/
² mesh
4
Draft Hood
Match
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow the steps outlined below for each
appliance connected to the venting system being placed
into operation, while all other appliances connected to
the venting system are not in operation could result in
carbon monoxide poisoning or death.
The following steps shall be followed for each appliance
connected to the venting system being placed into
operation, while all other appliances connected to the
venting system are not in operation:
1. Seal any unused openings in the venting system.
2. Inspect the venting system for proper size and horizontal
pitch, as required in the National Fuel Gas Code, ANSI
Z223.1/NFPA 54 or CSA B149.1, Natural Gas and Pro-
pane Installation Codes and these instructions. Deter-
mine that there is no blockage or restriction, leakage, cor-
rosion and other deficiencies which could cause an un-
safe condition.
3. As far as practical, close all building doors and windows
and all doors between the space in which the appliance(s)
connected to the venting system are located and other
spaces of the building.
4. Close fireplace dampers.
5. Turn on clothes dryers and any appliance not connected
to the venting system. Turn on any exhaust fans, such as
range hoods and bathroom exhausts, so they will operat-
ing at maximum speed. Do not operate a summer exhaust
fan.
6. Follow the lighting instructions. Place the appliance being
inspected into operation. Adjust thermostat so appliance
is operating continuously.
7. Test for spillage from draft hood equipped appliances at
the draft hood relief opening after 5 minutes of main burner
operation. Use the flame of a match or candle. (Figure 6)
8. If improper venting is observed, during any of the above
tests, the venting system must be corrected in accor-
dance with the National Fuel Gas Code, ANSI
Z223.1/NFPA 54 and/or CSA B149.1, Natural Gas and
Propane Installation Codes.
9. After it has been determined that each appliance con-
nected to the venting system properly vents when tested
as outlined above, return doors, windows, exhaust fans,
fireplace dampers and any other gas--fired burning ap-
pliance to their previous conditions of use.
For Two Pipe Installation
This furnace can NOT be common vented or connected to any type
B, BW or L vent or vent connector, nor to any portion of a factory--
built or masonry chimney. If this furnace is replacing a previously
common-vented furnace, it may be necessary to resize the existing
vent and chimney to prevent oversizing problems for the other re-
maining appliance(s). See "Venting and Combustion Air Check" in
this section. This furnace MUST be vented to the outside.
9
Advertisement
Table of Contents
