Thomas & Betts RZ405 559mm minimum Snow, Clearance, Exhaust, Terminal, 12 305mm, Minimum, Rear

Seal the seam in the vent pipe.

"X" is the length of combustion air pipe required through and above the roof

"X" must equal roof thickness plus clearance required for anticipated snow

plus ridge and/or parapet clearance "X" must not exceed 60" (1524mm)

V Flowent

6A

Install the vent pipe by inserting it into the terminal side of the box and pushing it out through the seal on the heater side.

NOTE: Be sure flow direction is correct.

2c) Attach the outside portion of the com-

bustion air pipe to the box. Determine the length of the combustion air pipe so that dimension "X" (Figure 6A) is equal to the roof thickness, plus snow depth and ridge or parapet clearance, but does not exceed 60" (1524 mm). Attach the combustion air pipe to the collar with sheetmetal screws being careful not to penetrate the vent pipe.

3. Attach the concentric adapter. Insert

the vent pipe and combustion air pipe up

through the roof and secure the adapter box.

6B

22"

(559mm) minimum

Snow

	Combustion
	air pipe
Field-supplied	Flow
mounting brackets
	Combustion

Flash the combustion air pipe to the outside

of the roof as required.

4. Slide the combustion air inlet over the

Clearance

	Air
Concentric
Adapter Box
Collar for combustion
air pipe.
Vent Pipe - when a taper-type reducer	Install seal
is required in the vent pipe; it must be no	in vent pipe
more than 6” (152mm) from the box.	opening

cause the pipe diameter does not change); plus bracket length; plus the width of the roof; plus the length of the outer inlet air pipe; plus a minimum of 22" (559mm).

Lubricate the seal and pipe with liquid soap or a rubber lubri- cant. (Installation Tip: Spray cooking oil works well as a lubri- cant for this task.) Being sure the pipe is in the proper flow direction, slide the end through the box and push it out through the rubber seal. Push evenly using caution not to displace the seal from its position on the edge of the hole. If the rubber seal moves, slide the pipe back slightly, re-position the seal, and slide the pipe through again.

Position the vent pipe so that it will extend a minimum of 22" (559mm) past the end of the combustion air pipe. See Figure 6B.

A maximum of 6" (152mm) of vent pipe should extend out the heater side. Any time the pipe is re-positioned, re-check the seal to be sure that it has not rolled. Adjust the pipe and seal until the pipe is the correct length on each side of the box and the seal is over the edge of the hole and tight to the entire circumference of the pipe.

6C	1)Slide combustion		vent pipe and fasten the collar
			to the end of the combustion air
	air inlet over the
			pipe with sheet metal screws
	vent pipe
			(See Figure 6C). Seal joint at top
	2)Fasten to the end
			between vent pipe and combus-
	of the combus-
			tion air inlet with silicone seal-
	tion air pipe
			ant to prevent water leakage.
	3)Seal the top joint
			5. Attach the exhaust termi-
	with silicone
			nal with sheet metal screws (See
	Install field-supplied		Figure 6D).
			6. Vertical vent terminal/combus-
	flashing at roof		tion air inlet is installed and ready
	opening (flashing not		for connection to the heater.
	illustrated).		7. Connect Concentric Adapter
		Box to the Heater - Use the pipe speci-
	Exhaust
		fied and joints required for type of pipe.
	Terminal
		If collars at the heater or adapter are dif-
	12" (305mm)	ferent diameters from the pipe (use only
		diameters allowed on page 6), make con-
	minimum
		nection with field-supplied taper-type re-
		ducer or enlarger.
	Combustion	A minimum of 12" (305 mm) of
		straight pipe is required at the venter
	Air Inlet	outlet. Due to the high temperature, do
		not enclose the vent pipe or place pipe
	6D	closer than 6" (152 mm) to combustible
		material.

Installation of the vertical vent and combustion air system on your sepa- rated-combustion unit is complete. Refer to Figure 6E and verify that all installation requirements are met.

Figure 6E - Installation of Separated-Combustion Unit with Vertical Vent and Combustion Air Pipes (Option CC2)

	Vent
	Terminal
Flue	Seal with high
	temperature silicone
Exhaust	rubber sealant supplied
(Vent )	with the kit.
Pipe
	Combustion
	Air Inlet
	Flashing
	(field supplied)
	Roof
Rear	Combustion Air Pipe
View	Concentric
Vent	Adapter
Pipe

Side View

	12” (305mm)
5 ft (1524mm)
maximum (Size	18”(457mm)
according to
	minimum
anticipated
snow depth.
	Concentric
	Adapter

"Through-the-Roof" View of a typical installation of a vertical vent/inlet air terminal and concentric adapter (Option CC2)

9-3/8”

(238mm)

6 ft (1829mm)

minimum

	Wall or
11” (279mm)	Adjoining
	Building

Flashing (field supplied)

Roof

Thimble

Mfg No. 164771, Page 9