Sears N9MP1 Venting and Combustion Air Check, Vent Check, Make the Following Check, Hood, Heater

3.Installairintakeminimumof12"abovemaximumsnow levelandclearofanyobstructionDuctorventilationopen.- ingrequiresonesquareinchoffreeareaper4,000BTUH

oftotal input rating for all gas appliances in area.

4.Air inlet MUST be screened with not less than 1/4" mesh

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 Con- fined 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 temper- ature 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

The following information is supplied to allow the installer to make

adjustments to the setup of existing appliances, IF REQUIRED, based on good trade practices, local codes, and good judgement

of the installer. Manufacturer does NOT take responsibility for

modifications made to existing equipment.

NOTE: If this installation replaces an existing furnace from a commonly vented system, the original venting system may no longer be sized to properly vent the attached appliances. An im- properly sized venting system may cause the formation of con- densate in the vent and the leakage or spillage of vent gases. To

make sure there is adequate combustion air for all appliances,

MAKE THE FOLLOWING CHECK.

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:

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 de to ensure there is no blockage or re- striction, 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 will operate at maximum speed. Do not operate a summer exhaust fan.

6.Followthe lighting instructions. Place the appliance being inspected into operation. Adjust thermostat so appliance is operate 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 or CSA B149. 1, Natural Gas and Pro-

pane 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.

Vent Check

	VentPipe	--_1		[	A/	Draft	Hood
Typical	Gas
Water	Heater,_	f	[	[	_ _,_._.		Match
	I				!
If flame	pulls towards			draft	hood,	this	indicates	suffi-
cient venting.

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 fac- tory-built or masonry chimney. If this furnace is replacing a pre-

viously 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 outside.

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