Raypak 850 Support of Vent Stack, Vent Terminal Location, Combustion, Exhaust, Certified Vent

Combustion	Exhaust	Heater Venting	Certified Vent	Combustion Air
Air Supply	Configuration	Category	Materials	Inlet Material
From Inside Building	Vertical Venting		(Canada Only: ULC-
	Horizontal Through-
(Non-Direct Venting)			S636 PVC and CPVC)
	the-Wall Venting	IV	Stainless Steel,
			AL29-4C, ANSI/ASTM
	Vertical Venting			Galvanized Steel,
From Outside Building			D1785 Sch 40 PVC,
	Horizontal Through-		ANSI/ASTM F441 Sch	PVC, ABS,
(Direct Venting)	the-Wall Venting		40 CPVC	CPVC
	Table K: Venting Category Requirements

WARNING: Do not use foam core or cellular core pipe for venting.

Support of Vent Stack

The weight of the vent stack or chimney must not rest on the heater vent connection. Support must be pro- vided in compliance with applicable codes. The vent should also be installed to maintain proper clearances from combustible materials. Use insulated vent pipe spacers where the vent passes through combustible roofs and walls.

When using PVC or CPVC venting on models 300 and 500, insert the vent pipe 3-5 inches into the unit and provide rigid support to the vent, so that it will not shift laterally.

Vent Terminal Location

1.Condensate can freeze on the vent cap. Frozen condensate on the vent cap can result in a blocked flue condition.

NOTE: During winter months check the vent cap and make sure no blockage occurs from build-up of snow or ice.

2.Give special attention to the location of the vent termination to avoid possibility of property dam- age or personal injury.

3.Gases may form a white vapor plume in winter. The plume could obstruct a window view if the ter- mination is installed near windows.

4.Prevailing winds, in combination with below-freez- ing temperatures, can cause freezing of condensate and water/ice build-up on buildings, plants or roofs.

WARNING: DO NOT insulate PVC or CPVC vent pipe.

5.The bottom of the vent terminal and the air intake shall be located at least 12 in. above grade, includ- ing normal snow line.

6.Single-wall Category IV metal vent pipe shall not be used outdoors in cold climates for venting gas- fired equipment without insulation.

7.Through-the-wall vents for Category IV appli- ances shall not terminate over public walkways or over an area where condensate or vapor could create a nuisance or hazard or could be detrimen- tal to the operation of regulators, relief valves, or other equipment.

8.Locate and guard vent termination to prevent acci- dental contact by people or pets.

9.DO NOT terminate vent in window well, stairwell, alcove, courtyard or other recessed area.

10.DO NOT terminate above any door, window, or gravity air intake. Condensate can freeze, causing ice formations.

11.Locate or guard vent to prevent condensate from damaging exterior finishes. Use a rust-resistant sheet metal backing plate against brick or mason- ry surfaces.

12.DO NOT extend exposed vent pipe outside of building beyond the minimum distance required for the vent termination. Condensate could freeze and block vent pipe.

NOTE: When using PVC vent termination, insert the two round stainless mesh screens provided with the unit into the tee.

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