Thomas & Betts RGM 405, RZ405 Venting and Combustion Air, Decide which Venting System to Install

7. Venting and Combustion Air

WARNING: The vent must be installed in accordance with national and local regulations. Failure to provide proper venting could result in death, serious injury and/or property damage. This unit must be installed with a vent to the outside of the building. Safe operation of any power-vented gas-fired equipment requires a properly operating vent system, correct provision for combustion air, and regular maintenance and inspection.

WARNING: Units installed in multiples require individual vent pipe runs and vent caps. Manifolding of vent runs is not permitted due to possible recirculation of combustion products into the building and back pressure effects on the combustion air proving switch.

Venting must be in accordance with the National Fuel Gas Code Z223.1 or CAN/CGA B149.1 and B149.2, Installation Code for Gas Burning Appliances and Equipment, and all local codes. Local requirements supersede national requirements. Combustion air for this heater may be either taken from the space or may be ducted from the outside using the

concentric adapter combustion air/vent system. Flue products must always be vented to the outdoors.

Installation should be done by a qualified agency in accordance with these instructions. The qualified service agency installing the vent or vent/combustion air system is responsible for the installation.

The venting or venting/combustion air systems illustrated in this manual are the only ones approved for a Model CAUA heater. However, since more than one system is approved and requirements vary depending on the type of installation, the first step must be deciding which vent or vent/combustion air system is going to be installed. Review the follow- ing matrix of vent types and installation requirements. If there is any doubt as to what type of vent is required, contact the equipment dis- tributor before beginning installation.

Hazards of Chlorines - The presence of chlorine vapors in the com- bustion air of gas-fired heating equipment presents a potential corro- sion hazard. Chlorine will, when exposed to flame, precipitate from the compound, usually freon or degreaser vapors, and go into solution with any condensation that is present in the heat exchanger or associated parts. The result is hydrochloric acid which readily attacks all metals including 300 grade stainless steel.

Care should be taken to separate these vapors from the combustion process. This may be done by installing a separated combustion sys- tem and/or wise location of the furnace with regard to exhausters or prevailing wind direction. Chlorine is heavier than air. This fact should be kept in mind when determining installation locations of heating equip- ment and building exhaust systems.

STEP 1 - Decide which Venting System to Install:

Type of	Type of Vent System	Vent Configuration/Options	Type of VENT Pipe* Required
Installation	(Description/Instructions)	Required
COMMERCIAL/	S eparated-Combustion	Horizontal Vent / Option CC6	Use either vent pipe approved for a Category III
INDUS TRIAL	(uses a power venter to duct	(includes concentric adapter box,	appliance OR single-wall, 26-gauge or heavier
(Harmonized	combustion air from outdoors	exhaust terminal, and inlet air guard)	galvanized (or a material of equivalent durability
ANS I Z83.8-1996	and exhaust flue products to	Vertical Vent / Option CC2	and corrosion resistance) vent pipe.
and Canadian	the outdoors) - (follow	(includes concentric adapter box,
S tandard	Instructions in S ection 7A)	exhaust terminal, and combustion air
CAN/CGA 2.6-		inlet)
M96)	Power-Vented (uses a power	Horizontal Vent / Option CC1	Use either vent pipe approved for a Category III
	venter to draw combustion air	Vent Cap or field-supplied	appliance OR appropriately sealed 26-gauge
	from the indoor space and	equivalent (see page 11)	galvanized steel or equivalent single-wall pipe. If
	exhaust flue products to the		local code requires, the terminal section may be
	outdoors) - (follow		double-wall pipe with a single-wall vent run.
	Instructions in S ection 7B)
		At least 1/2 of the Equivalent	Vent pipe listed above for a horizontal power-
		Vent Length is Vertical / Option	vented system may be used, OR vent pipe
		CC1 Vent Cap or field-supplied	approved for a Category I heater may be used.
		equivalent (see page 11)	Single-wall pipe or double-wall (Type B) vent
			pipe are suitable for use with a Category I heater.
			If local code requires, the terminal section may be
			double-wall pipe with a single-wall vent run.

STEP 2 - Follow the instructions that apply to the type of vent being installed

•Separated-Combustion -- requires air inlet pipe, exhaust vent pipe, and concentric adapter kit (Option CC2 or CC6)

Using required pipe (See Table above), FOLLOW INSTRUCTIONS IN SECTION 7A

•Power Vent -- requires vent pipe and vent cap (Option CC1 or field-supplied Type L Breidert Air-x-hauster®or equivalent vent cap)

Using required pipe (See Table above), FOLLOW INSTRUCTIONS IN SECTION 7B

Form 405, Page 4