International comfort products N9MP1 Installation Instructions Manual page 10

shall commence within 12² (300 mm) of the ceiling and the
second opening shall commence within 12² (300 mm) of the
floor. The minimum dimension of air openings shall be at least
3² (80 mm).
·
Combining spaces on different floor levels. The volumes of
spaces on different floor levels shall be considered communi-
cating spaces if connected by one or more permanent open-
ings in doors or floors having a free area of at least 2² 2/1,000
Btuh (4,400 mm2/kW) of total input rating of all gas ap-
pliances.
·
An attic or crawl space may be considered a space that freely
communicates with the outdoors provided there are adequate
ventilation openings directly to outdoors. Openings MUST re-
main open and NOT have any means of being closed off. Ven-
tilation openings to outdoors MUST be at least 1 square inch
of free area per 4,000 BTUH of total input rating for all gas ap-
pliances in the space.
·
In spaces that use the Indoor Combustion Air Method, in-
filtration should be adequate to provide air for combustion,
ventilation and dilution of flue gases. However, in buildings
with unusually tight construction, additional air MUST be pro-
vided using the methods described in section titled Outdoor
Combustion Air Method:
·
Unusually tight construction is defined as Construction with:
1. Walls and ceilings exposed to the outdoors have a con-
tinuous, 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° so that
flue gases will not condense excessively in the heat exchanger.
Excessive condensation will shorten the life of the heat exchanger
and possibly void your warranty.
Venting and Combustion Air Check
Figure 6
Vent Check
Vent Pipe
Typical Gas
Water Heater
If flame pulls towards draft hood, this indicates sufficient
venting.
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
10
Draft Hood
Match
adequate combustion air for all appliances, MAKE THE FOL-
LOWING CHECK.
WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow the steps outlined below for each
appliance connected to the venting system being
placed into 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
Propane Installation Code and these instructions. Deter-
mine that there is no blockage or restriction, leakage,
corrosion and other deficiencies which could cause an
unsafe 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 are
operating at maximum speed. Do not operate a summer
exhaust fan.
6. Follow the lighting instructions. Place the appliance being
inspected into operation. Adjust the 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
accordance with the National Fuel Gas Code, ANSI
Z223.1/NFPA 54 and/or CSA B149.1, Natural Gas and
Propane Installation Code.
9. After it has been determined that each appliance
connected to the venting system properly vents when
tested as outlined above, return doors, windows, exhaust
fans, fireplace dampers and any other gas--fired burning
appliance 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 facto-
ry--built or masonry chimney. If this furnace is replacing a previous-
ly common-vented furnace, it may be necessary to resize the
existing vent and chimney to prevent oversizing problems for the
other remaining appliance(s). See "Venting and Combustion Air
Check" in this section. This furnace MUST be vented to the out-
side.
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