GSW 319594-000 Exhaust Venting, Important Notes and Warnings, Gas Code ANSI Z223.1 NFPA 54 U.S.A

Exhaust Venting			Important Notes and Warnings
This heater is designed to exhaust the products of combus-			• This heater is certified to be installed using Schedule 40
tion (flue gases) to the outdoors using a sealed piping sys-			PVC or CPVC plastic vent material. In Canada some
tem. Table 2 lists the allowable vent materials and sizing			jurisdictions require that this material is approved to
information. Figure 8 shows the general venting layout while			ULC S636. ULC S636 mandates that components from
Figures 9-11 show various end termination details and			different systems must not be mixed in the same vent
clearances. Connection of the venting piping to the blower			runs. Check local codes to determine which materials
is shown in Figures 13-15.			are allowed in your area and only use approved materi-
			al. All venting material and components must be joined
Correct installation of the venting system is essential to the			with the approved primer/cleaner and solvent cement.
safe and efficient operation of this water heater. Vent piping			• Do not common vent this heater with any other appli-
must be installed in accordance with all applicable local and			ance.
provincial or state codes. In the absence of such codes, all			• During operation the plastic piping will expand as it
installation shall meet the requirements as stated in the lat-			heats up and contract as it cools down. This is normal
est edition of the "Natural Gas and Propane Installation			for this type of venting. Rigidly fastening the vent piping
Codes" CAN/CSA-B149-1 (Canada) or "National Fuel			can cause undue stress that may result in the cracking
Gas Code" ANSI Z223.1 (NFPA 54) (U.S.A.).			or fracturing the vent piping material. A fracture of the
			venting pipe poses a serious safety hazard. To prevent
NOT RECOMMENDED:	PREFERRED PRACTICE:		stressing of the vent system, all hangers and supports
			must allow the vent piping freedom to move.
			• Use long sweep elbows wherever possible. Closely-
			coupled elbows and short radius elbows can reduce the
			venting capacity.
			• All power vented water heaters generate a certain
STREET ELBOW	NORMAL ELBOW		amount of operational noise. In order to minimize noise
			transmission to the support structure, use isolation pads
			between the pipe hangers and the vent pipe.
			• Most power vent installations develop some condensa-
			tion in the vent piping. When using long runs of venting
		150mm
		(6 in.) min.	or when the venting passes through cold or unheated
			areas, considerable amounts of condensate from the
BACK TO BACK ELBOWS			flue gases can develop. Provision must be made for the
			condensate to drain freely from the system or to be col-
			lected in a condensate trap(s) that can be drained.
			Damage or fracture of the vent piping may occur if the
			condensate is allowed to collect and freeze. Pooling of
			condensate can restrict airflow and can cause nuisance
			failures of the system.
			• Be aware of any concealed wiring or piping inside the
			walls.
			• Ensure sufficient ventilation air to prevent elevated tem-
			peratures in closets and ventilated spaces.

90° SHORT SWEEP ELBOW	90° LONG SWEEP ELBOW
	(MORE RESTRICTIVE)	(LESS RESTRICTIVE)
Figure 6 Pipe Fittings And Practices
Note: The information provided in Figure 6 is intended as a
guideline for good vent installation practices only and is not
intended to restrict venting options beyond those restric-
tions established by the latest edition of the "Natural Gas
and Propane Installation Codes" CAN/CSA-B149-1 or				VENT LENGTH LESS THAN OR
					VENT LENGTH GREATER THAN 6.1
any applicable local and provincial codes.				EQUAL TO 6.1 EQUIVALENT METRES	EQUIVALENT METRES (20 FT.) USE
				(20 FT.) USE THIS SCREEN.		THIS SCREEN.
			– 11	Figure 7 Rodent Screens
				–