Raypak 302A-902A manual Model, Certified, Maximum, Combustion, Air Inlet, Material, Vent Length

Model	Certified		Maximum	Combustion	Air Inlet
				Air	Max. Length
	Venting	Vent Size	Equivalent
No.				Intake Pipe
	Material		Vent Length*		6”	8”
				Material
302A		5”	70’		100’	N/A
402A
		6”	Room Air	Galvanized
502A				Steel,	75’
	Category III		40’	PVC,
						100’
652A
			Ducted	ABS,	40’
752A		8”	Combustion	CPVC
			Air
902A					30’	80’

* Subtract 10 ft per elbow. Max. 3 elbows.

Maximum combustion air duct length terminated at 100 equivalent ft.

Table M: Category III Horizontal and Direct Venting

Use only the special gas vent pipes listed for use with Category III gas burning heaters, such as the AL29-4C stainless steel vents offered by Heat Fab Inc. (800- 772-0739), Protech System, Inc. (800-766-3473) or Z- Flex (800-654-5600). Pipe joints must be positively sealed. Follow the vent manufacturer’s installation instructions carefully.

Direct Vent - Horizontal Through- the-Wall

Note: When vertical height exceeds 25 ft,

consult factory prior to installation.

Fig. 26: Direct Vent - Horizontal Through-the-Wall

Installation

These installations utilize the heater-mounted blower to draw combustion air from outdoors and vent com- bustion products to the outdoors.

The total length of the through-the-wall flue cannot exceed 40 equivalent ft in length for the flue outlet. Each elbow used is equal to 10 ft of straight pipe. This will allow installation in one of the three following arrangements:

•40’ of straight flue pipe

•30’ of straight flue pipe and one elbow

•20’ of straight flue pipe and two elbows.

The total length of air supply pipe cannot exceed the distances listed in Table M. Each elbow used is equal to 10 ft of straight pipe. This will allow installation in any arrangement that does not exceed the lengths shown in Table M.

The flue direct vent cap is not considered in the over- all length of the venting system.

Care must be taken during assembly that all joints are sealed properly and are airtight.

The vent must be installed to prevent the potential ac- cumulation of condensate in the vent pipes. It is re- quired that:

1.The vent must be installed with a slight downward slope of not more than 1/4 inch per foot of hori- zontal run to the vent terminal.

2.The vent must be insulated through the length of the horizontal run.

31