Lochinvar 45,000 - 260,000 BTU/HR Minimum Recommended Combustion AIR Supply to Equipment Room

Installation & Service Manual

1Determine boiler location

TABLE - 1B

MINIMUM RECOMMENDED COMBUSTION

AIR SUPPLY TO EQUIPMENT ROOM

	*Outside Air from			*Outside Air from		**Inside Air from
Input	2 Openings Directly from		*Outside Air from	2 Ducts Delivered from		2 Ducts Delivered from
	Outdoors		1 Opening Directly	Outdoors		Interior Space
Btu/hr
			from Outdoors, in2
	Top	Bottom		Top	Bottom	Top	Bottom
	Opening, in2	Opening, in2		Opening, in2	Opening, in2	Opening, in2	Opening, in2
45,000	12	12	15	23	23	100	100
	(78 cm2)	(78 cm2)	(97 cm2)	(149 cm2)	(149 cm2)	(646 cm2)	(646 cm2)
75,000	19	19	25	38	38	100	100
	(123 cm2)	(123 cm2)	(162 cm2)	(246 cm2)	(246 cm2)	(646 cm2)	(646 cm2)
90,000	23	23	30	45	45	100	100
	(148 cm2)	(148 cm2)	(194 cm2)	(291 cm2)	(291 cm2)	(646 cm2)	(646 cm2)
135,000	34	34	45	68	68	135	135
	(220 cm2)	(220 cm2)	(291 cm2)	(439 cm2)	(439 cm2)	(871 cm2)	(871 cm2)
180,000	45	45	60	90	90	180	180
	(291 cm2)	(291 cm2)	(388 cm2)	(581 cm2)	(581 cm2)	(1,162 cm2)	(1,162 cm2)
215,000	54	54	72	108	108	215	215
	(349 cm2)	(349 cm2)	(465 cm2)	(697 cm2)	(697 cm2)	(1,388 cm2)	(1,388 cm2)
260,000	65	65	87	130	130	260	260
	(420 cm2)	(420 cm2)	(562 cm2)	(839 cm2)	(839 cm2)	(1,678 cm2)	(1,678 cm2)

*Outside air openings shall directly communicate with the outdoors. When combustion air is drawn from the outside through a duct, the net free area of each of the two openings must have twice (2 times) the free area required for Outside Air/2 Openings. The above requirements are for the boiler only; additional gas fired appliances in the equipment room will require an increase in the net free area to supply adequate combustion air for all appliances.

**Combined interior space must be 50 cubic feet per 1,000 Btu/hr input. Buildings MUST NOT be of *“Tight Construction”. For buildings of *“Tight Construction”, provide air openings into the building from outside.

*No combustion air openings are needed when the water heater is installed in a space with a volume NO LESS than 50 cubic feet per 1,000 Btu/hr of all installed gas fired appliances. Buildings MUST NOT be of *“Tight Construction”.

*”Tight Construction” is defined as a building with less than 0.40 ACH (air changes per hour).

Vent installations for connection to gas vents or chimneys must be in accordance with “Venting of Equipment,” of the latest edition of the National Fuel Gas Code, ANSI Z223.1, in Canada, the latest edition of CGA Standard B149 Installation Code for Gas Burning Appliances and Equipment or applicable provisions of the local building codes.

Adequate combustion and ventilation air must be supplied to the room where the appliance is installed in accordance with the latest edition of the National Fuel Gas Code, ANSI Z223.1, in Canada, the latest edition of CGA Standard B149 Installation Code for Gas Burning Appliances and Equipment, or applicable provisions of the local building codes.

The distance of the vent terminal from adjacent buildings, windows that open and building openings MUST comply with the latest edition of the National Fuel Gas Code, ANSI Z223.1, in Canada, the latest edition of CGA Standard B149 Installation Code for Gas Burning Appliances and Equip- ment.

Vent connection is made directly to the top of the appliance. This appliance is designed with a built-in draft diverter. No additional external draft hood is required. The connection from the appliance vent to the common vent or chimney must be made as direct as possible.

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