Hobart IB57 ML-110898, IB235 ML-110861 manual Venting Requirements, Acceptable Vent Piping

VENTING REQUIREMENTS

WARNING: PROVIDE A SCREEN OR BARRIER TO PREVENT PERSONAL INJURY IN AREAS WHERE INADVERTENT PERSONNEL CONTACT WITH THE HOT VENT PIPE CAN OCCUR.

Models IB57 and IB140 are Category IV (positive flue pressure, excessive condensate, and flue gas temperature at the heater outlet approximately 330°F). Models IB235 and IB290 are Category III (positive flue pressure, not excessive condensate, and flue gas temperature at the heater outlet approximately 530°F). The vent outlet on the booster heater is 3 inches in diameter. Models IB57 and IB140 require 3 inch minimum vent pipe throughout. Models IB235 and IB290 require 4 inch minimum vent pipe; the 3 inch adjustable vent pipe elbow and the 3 inch to 4 inch vent pipe adapter (provided on IB235 and IB290) are to be installed at the vent outlet of the booster heater (Fig. 1). On all models, 1/4 inch per foot minimum incline must be maintained.

Models IB235 & IB290 Only

	Water Out
3 to 4 Inch	Gas
Adapter
3 Inch Elbow	Water In
	Vent
	Temperature and
	Pressure Relief Valve

Fig. 1

PL-53440

Vent piping must be one of the types mentioned in this manual and must be properly installed according to the vent pipe manufacturer's instructions. Each vent joint must be properly sealed and secured so it stays in place.

ACCEPTABLE VENT PIPING

		MATERIAL	TERMINATION	IB57 or IB140	IB235 or IB290
MANUFACTURER	MODEL			TERMINATION	TERMINATION
		SPECIFICATION	Part Name
				Part Number	Part Number
Heat-Fab Inc.		AL 29-4C*	Tee	7390TEE	7490TEE
38 Haywood St.	Saf-T-Vent		Rain Cap	5300C1	5400C1
		Stainless Steel
Greenfield, MA 01301			Mitre / Straight	7390GC	--
Z-Flex US, Inc.		AL 29-4C*	Tee	#02SVSTTX-3	#02SVSTTX-4
20 Commerce Park North	Z-Vent		Rain Cap	#02VRSRCX03	#02VRSRCX04
		Stainless Steel
Bedford, NH 03110			Termination Box	#02SVSRTX-3	#02SVSRTX-4

* AL 29-4C is a registered trademark of Allegheny Ludlum Corp.

Per the National Fuel Gas Code, ANSI Z223.1, the heater must be vented in one of three ways:

1.Into the exhaust system (Fig. 2). The vent pipe must not penetrate the filter. When the heater is vented into the exhaust system, an electrical interlock must be provided (by others) to allow the flow of gas to the booster heater burner ONLY when the exhaust system is functioning. Refer to APS1 and APS2 on the wiring diagram in the control box accessed by removing the left side panel (also refer to pages 12 and 13).

2.Through the sidewall, or the ceiling (Fig. 3). Type B-1 vent pipe (4 inch minimum diameter for IB57 and IB140, 5 inch minimum diameter for IB235 and IB290) may be used when venting vertically, provided a one inch minimum clearance to combustible construction is maintained and the termination above the roof uses a listed wind cap.

3.Freely vented into the room or space where it is installed (Fig. 4), provided that:

a.A mechanical exhaust system is present in the kitchen,

b.The flue outlet of the booster water heater is at least 36 inches vertically and 6 inches horizontally distant from any surface other than the booster / or dishwasher, and

c.Any or all gas fired equipment is installed so the total BTU input rating of the unvented gas appliance(s) divided by the total cubic feet of the room area (including any areas adjacent that cannot be closed off) does not exceed 20 BTU per hour per cubic foot.

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