Lochinvar 81 - 286 operation manual Boiler Flue Intake Air Adapter Termination

Installation & Operation Manual

3 General venting (continued)

Stainless steel air intake/vent connections Figure 3-11Near Boiler Stainless Steel Venting Model 286

1. Combustion Air Intake Connector (FIG. 3-11) - Used to provide combustion air directly to the unit from outdoors. A fitting is provided on the unit for final connection. Combustion air piping must be supported per guidelines listed in the National Mechanical Code, Section 305, Table 305.4 or as local codes dictate.

2. Vent Connector (FIG. 3-11) - Used to provide a passageway for conveying combustion gases to the outside. A transition fitting is provided on the unit for final connection. Vent piping must be supported per the National Building Code, Section 305, Table 305.4 or as local codes dictate.

									3" S.S. ADAPTER
								3" S.S. INTERMEDIATE
								(FOR SAF-T VENT ONLY)
Table 3B Approved Stainless Steel Terminations and Adapters
		ProTech			Heat Fab					Z Flex
Model		FasNSeal			Saf-T Vent					Z-Vent
	Boiler	Flue	Intake	Boiler	Intermediate	Flue	Intake	Boiler		Flue	Intake Air
			Air				Air
	Adapter	Termination		Adapter	Adapter	Termination		Adapter		Termination	Termination
			Termination				Termination
81 - 211	300715	FSBS3	303889	KB80210	9353BUREZ-1*	9392	9314TERM	2SVSLA03		2SVSTP03	2SVSTEX0390
		FSRC3(R.C)				5300CI				2SVSRCX03
286	F303759	FSBS4	FSAIH04	KB285600	9454BUREZ-1*	9492	9414TERM	2SVSLA04		2SVSTP04	2SVSTEX0490
		FSRC4(R.C.)	303888			5400CI				2SVSRCX04

*= This adapter must be used in addition to the boiler adapter for Saf-T vent pipe as shown in FIG. 3-11, unless approved vent other than standard diameter is used. Consult a Heat Fab representative for questions.

The Knight boiler uses model specific combustion air intake and vent piping sizes as detailed in Table 3C below.

Minimum / Maximum allowable combustion air and vent piping lengths are as follows:

Table 3C Air Intake/Vent Piping Sizes

Model		Air Intake	Vent
81 - 211		3 inches	3 inches
286		4 inches	4 inches
	Increasing or decreasing combustion air
NOTICE
	or vent piping is not authorized.

Combustion Air = 12 equivalent feet minimum / 100 equivalent feet maximum

Vent = 12 equivalent feet minimum / 100 equivalent feet maximum

When determining equivalent combustion air and vent length, add 5 feet for each 90° elbow and 3 feet for each 45° elbow.

EXAMPLE: 20 feet of PVC pipe + (4) 90° elbows + (2) 45° elbows + (1) concentric vent kit (CVK3003) = 49 equivalent feet of piping.

NOTICE	The appliance output rating will reduce by
	up to 1.5% for each 25 feet of vent length.

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