Raypak manual Galvanized ADB-751 Venting Material e.g Subtract 10 ft per

	Venting	Certified Venting	Vent Size	Maximum Vent	Combustion Air	Air Inlet	Max. Air
Model					Intake Pipe	Size	Intake Length
	Category	Material	(inches)	Length (feet)
					Material	(inches)	(feet)
		UL 1738 Certified		35	Galvanized		35
ADB-751	IV	Venting Material e.g.	8	Subtract 10 ft per	Steel	6	Subtract 10 ft
w/CHX		AL29-4C Stainless		elbow, Max. 3	PVC, ABS		per elbow,
		Steel PVC*, CPVC*		elbows	CPVC		Max. 3 elbows
		UL 1738 Certified		35	Galvanized		35
ADB-1001	IV	Venting Material e.g.	10	Subtract 10 ft per	Steel	6	Subtract 10 ft
w/CHX		AL29-4C Stainless		elbow, Max. 3	PVC, ABS		per elbow,
		Steel PVC*, CPVC*		elbows	CPVC		Max. 3 elbows
		UL 1738 Certified		35	Galvanized		35
ADB-1501	IV	Venting Material e.g.	12	Subtract 10 ft per	Steel	8**	Subtract 10 ft
w/CHX		AL29-4C Stainless		elbow, Max. 3	PVC, ABS		per elbow,
		Steel PVC*, CPVC*		elbows	CPVC		Max. 3 elbows

*Contact the manufacturer for details.

**If the boiler is direct vented, a 6 to 8 in. adapter must be installed at the blower inlet.

Table R: Vertical Direct Venting with Add-on

Secondary Condensing Heat Exchanger

Vertical Direct Venting System With	Outdoor Installation with Add-On
Add-on Condensing Heat Exchanger	Condensing Heat Exchanger
(Category IV) Installation

These installations utilize the boiler mounted blower to draw combustion air from outdoors and vent combus- tion products to the outdoors.

UL 1738 Certified Venting Material (e.g. AL29-4C) MUST be used. The vent must be installed to prevent flue gas leakage. Care must be taken during assembly to ensure that all joints are sealed properly and are air- tight.

For certain installations, i.e. pool, heat-pump, domes- tic hot water supply with pre-heat tank, PVC or CPVC may be used. Contact manufacturer for details.

To prevent the condensation accumulation in the vent, it is required to install the horizontal portion of vent with a slight upward slope of not more than 1/4" per foot of horizontal run and an approved condensate trap must be installed per applicable codes.

WARNING: For common vent installations, contact the factory.

WARNING: No substitutions of flue pipe or vent cap material are allowed. Such substitutions would jeopardize the safety and health of inhabitants.

The Stainless Steel non-restricted direct vent cap must be furnished by the boiler manufacturer in accordance with its listing.

Outdoor models are self-venting when installed with the factory-supplied non-restricted direct vent cap and require no additional vent piping. This special vent cap is provided with the boiler in accordance with CSA requirements. It must be installed directly on the boiler in a horizontal position. Notching of the vent cap mounting flange may be necessary to clear outlet pip- ing on some models.

Care must be taken when locating the outdoor unit because the flue gases discharged from the vent cap can condense as they leave the cap. Improper location can result in damage to adjacent structures or building finish. For maximum efficiency and safety, the follow- ing precautions must be observed:

a)Outdoor models must be installed outdoors and must use the non-restricted direct vent cap sup- plied by the manufacturer.

b)Periodically check venting system. The boiler’s venting areas must never be obstructed in any way and minimum clearances must be observed to prevent restriction of combustion and ventilation air. Keep area clear and free of combustible and flammable materials.

c)Do not locate adjacent to any window, door walk- way, or gravity air intake. The vent should be located four (4) feet horizontally from such areas.

d)Install above grade level and above normal snow levels.

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