Thomas & Betts RGM 405, RZ405 Venting and Combustion Air contd, Joints, Support, Clearance

Taper-type Connector

Either collar or smaller diameter pipe

7. Venting and Combustion Air (cont'd)

7A. Venting and Combustion Air Requirements for Separated-Combustion Installation (must use either Option CC2 or CC6) (cont'd)

4.Pipe Diameter and Length

Maximum Pipe Length from Heater to Concentric Adapter -

minimum length is five feet (1524mm)

Model	Pipe Diameter		Maximum	90° Elbow	45° Elbow
CAUA	Vent	Inlet Air	Length	Equals*	Equals*
150-200	5"	5"	40 ft	5 ft	2.5 ft
			12.2 M	1524 mm	762 mm
250	5"	6"	50 ft	5 ft	2.5 ft
			15.2 M	1524 mm	762 mm
300-400	6"	6"	50 ft	5 ft	2.5 ft
			15.2 M	1524 mm	762 mm

*Reduce maximum length by this amount for each elbow.

Concentric Pipes (the vent pipe runs concentric through the out-

door portion of the combustion air pipe) - Sizes 150 and 200 require a 6" diameter combustion air pipe for outdoor portion and a 4" diam- eter vent pipe through the concentric adapter to the terminal; Sizes 250-400 require an 8" diameter combustion air pipe for the outdoor portion and a 5" diameter vent pipe through the concentric adapter to the terminal.

Length depends on building construction; specific requirements are included with the concentric adapter kit instructions.

either tape suitable for 550°F (such as Option FA1, P/N 98266) or high-temperature (450°F) silicone sealant.

•If using Category III vent pipe, follow the pipe manufacturer's in- structions for joining pipe sections.

In Concentric Pipes (outdoor portion) from Concentric Adapter Box to Air Inlet and Vent Terminal - Follow the installation instruc-

tions for the specific option (CC6 for horizontal vent; CC2 for vertical vent).

Joints Requiring Taper-type Connections (See Figure 4) - When the diameter of the pipe in the vent pipe run is different from the vent pipe in the terminal section, the joint must be made with a taper-type pipe connector. Install the connector no more than 6" (152mm) from the concentric adapter box. A 5" to 4" reducer is required in the vent pipe on Sizes 150 - 200; a 6" to 5" reducer is required on Sizes 300 - 400.

Figure 4 - When joining different pipe diameters, use taper- type pipe connectors

Reducer

Airflow

Secure joints with sheetmetal screws and seal.

5.Joints

Determined by type of pipe - Provide field-supplied vent pipe as specified in the Table on page 4.

•If using single wall, 26-gauge or heavier galvanized pipe, secure slip-fit connections using sheet metal screws or rivets. Seal all joints. Seal combustion air pipe with pressure sensitive tape ordi- narily used for warm-air ductwork. Seal flue exhaust pipe with

6.Support

Support horizontal runs every six feet (1829mm); do not rely on the heater or concentric adapter for support of either horizontal or vertical pipes.

7.Clearance

Clearance from the vent pipe to combustibles is 6" (152mm). Do not enclose the vent pipe.

Instructions and Requirements for Installing Horizontal Vent Terminal/Combustion Air Inlet Option CC6

Option CC6 Package includes:

Qty	Description	150,	250, 300,
		200	350, 400
1	Complete Horizontal Vent Kit	157158	82131
	(Same as Option CC6)
1	Concentric Box Assembly	155392	68404
	(See Figures 3A and 3B)
1	Screened	155096	53316
	Exhaust Assy
1	Inlet	151755	124940
	Guard
4	#10-16x1/2" lg Screws (to	37661	37661
	attach the inlet guard)
1	Rubber seal for vent pipe opening	164492	164493
	in concentric adapter
1	Tube of high temperature (450°F)	53335	53335
	silicone sealant

Field-supplied installation requirements:

•Thimble (a thimble is not required if wall is of non-combus- tible construction)

•Flashing

•Vent pipes (see requirements on pages 4 and 6)

•Combustion air pipes (see requirements on pages 4 and 6)

•Mounting brackets for concentric adapter box (or box may be mounted flush, depending on building construction)

•Taper-type reducers as required (see requirements above)

Installation Instructions for Option CC6

1.Determine the location on the outside wall for the vent terminal (Applies to all horizontal vent kits). In most applications, the terminal would be on a level with the heater mounting height. Allow 1/4" per foot downward pitch toward the terminal for draining of condensation.

The distance of the termination of the horizontal vent from adjacent public walkways, adjacent buildings, openable windows, and building openings must be in accordance with local codes or, in the absence of local codes, must conform with National Fuel Gas Code. Local codes supersede all provisions in these instructions and in the National Fuel Gas Code. Mini- mum clearances for the horizontal vent terminal are as shown in the table on page 7.

Products of combustion can cause discoloration of some building finishes and deterioration of masonry materials. Applying a clear silicone sealant that is normally used to protect concrete driveways can protect masonry materials. If discoloration is an esthetic problem, relocate the vent or install a vertical vent.

WARNING: All vent terminals must be positioned or located away from fresh air intakes, doors and windows to preclude combustion products from entering occupied space. See Hazard Levels, page 2.

Form 405, Page 6