GSW JWF307, JW727 JWF657, JW717, JW517, JW327 JWF507, JW317 Air Requirements, Air Supply, In Canada

VENT					DRAFT	RISE 20mm/m
					REGULATOR	(1/4 in./ft.)
FILL CAP	SERVICE			BLOCKED VENT
	SWITCH			SAFETY SWITCH
		LEVEL
		GAUGE				T&P VALVE
	OIL		AQUASTAT
			OPERATING
	STORAGE		INSTRUCTIONS

TANK

CUT OFF VALVE

OIL FILTER

OIL

BURNER

Figure 4 INSTALLATION DIAGRAM

Air Requirements

An adequate supply of combustion and ventilation air is required to:

•Ensure proper combustion.

•Reduce risk of property damage, severe bodily injury or death from possible flue gas leakage and carbon monoxide emissions.

Do not install an exhaust fan in the same room as the water heater.

Satisfactory combustion cannot be sustained in an area that is not provided with fresh air. Fresh air contains oxygen that is necessary for proper combustion. If the water heater is installed in a confined space, sufficient fresh air must be drawn in from outside of the enclosure.

NOTE: Lack of adequate fresh air supply may cause a poor flame.

Air Supply

CAUTION

IF AN ALL-HOUSE VENTILATION FAN IS USED, A SEPARATE OUTSIDE AIR DUCT MUST BE USED AND DUCTED TO THE FURNACE ROOM AND/OR ROOM WHERE THE WATER HEATER IS LOCATED.

In Canada:

If the water heater is installed in a house built to the require- ments of the “National Building Code of Canada, 1985”, or a subsequent edition, the space shall be provided with a air inlets as outlined below, or have a mechanical air-supply system of sufficient equivalent capacity. If a mechanical air- supply system is used, it shall be interlocked to the appli- ance or equipment.

NOTE: In unconfined spaces in buildings of conventional frame, brick, or stone construction built prior to the require- ments of the “National Building Code of Canada, 1985”, and not subsequently significantly air-tightened, infiltration is normally adequate to provide air for combustion and some ventilation; however, there may be notable exceptions. Houses built in accordance with the “National Building Code of Canada, 1985” (or subsequent edition), with exten-

sive exterior stucco coating, or with a sealed vapour barrier or other similar air sealing technique, will often be sufficient- ly airtight so that there is not sufficient air for both combus- tion and venting the products of combustion of an oil-fired appliance, or for replacing the air vented by other exhaust devices within the house.

Outdoor Combustion & Ventilation Air (Unconfined space)

If the water heater is installed in an unconfined space in a building having insufficient infiltration, additional air for com- bustion and ventilation shall be obtained from outdoors or from spaces freely communicating with the outdoors. Under these conditions, permanent opening(s) shall be provided so that the total air received through these openings will be at least as much as would be admitted by openings having a total free area of 4.5 cm2/kWh (1 in2/5000 Btu/h) of the total input rating of all oil-fired appliances.

Outdoor Combustion & Ventilation Air (Confined space)

A heater installed in a confined space that obtains all of its air for combustion and ventilation from outside the building shall be provided with two permanent openings, one near the top of the enclosure and another near the bottom. Each opening shall communicate directly or by means of ducts with the outdoors or to such spaces (such as a crawl space) that freely communicate with the outdoors, and shall be sized in accordance with “Air Duct Sizing”.

Outdoor Combustion Air & Indoor Ventilation Air (Confined space)

An appliance located in a confined space that obtains its combustion air from outdoors and ventilation air from within the conditioned space of the building shall be provided with two permanent openings for ventilation. One located near the top of the enclosure and another near the bottom. Each opening shall have a free area of not less than 19.5 cm2/kWh (1 in2/1000 Btu/h) of the total input rating of all

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