Rheem Commercial Power Direct Vent Water heater Horizontal Vent Terminal Location

Installation

VERTICAL VENT INSTALLATION – Once the vent termi- nal location has been determined, make a hole through the roof and interior ceiling to accommodate the vent pipe. Com- plete the vent pipe installation to the water heater’s vent connector fitting on the blower outlet. Support vertical or horizontal runs as previously mentioned.

Install adequate flashing where the vent pipe passes through the roof. Determine the vent terminal height and cut vent pipe ac- cordingly. Refer to Fig. 8 for proper vent terminal height. Connect vent elbow onto vertical pipe through roof. Connect short piece of vent pipe (approximately 3" long) to elbow, then join terminal to the short piece of vent pipe.

VERTICAL VENT TERMINAL LOCATION – The location of vertical vent terminal depends on the following considerations (see Figure 8):

1.Minimum twelve (12) inches above roof.

2.Minimum twelve (12) inches above anticipated snow level.

3.Maximum twenty-four (24) inches above roof level without additional support for vent pipe.

4.Four (4) feet from any gable, dormer or other roof structure with building interior access (i.e., vent, window, etc.).

5.Ten (10) feet from any forced air inlet to the building. Any fresh or make-up air inlet such as a dryer or furnace area is considered to be a forced air inlet.

6.The inlet is a minimum of six (6) inches vertically above the outlet.

7.Terminals are a minimum of seven (7) inches horizontally apart with a maximum of twenty-four (24) inches.

VENT INSTALLATION – Before proceeding, make certain you understand the procedure and cautions covered in the section “Joining Pipes and Fittings.”

G

D

	E
V	B
	V
L

F

v

A

	C
		ED
v	FIX		ED
	OS
	CL
			E
			ABL
	ER
	OP
v
	B

H

				C				M
					v
B				D
				FIXEED
			BLE	OS
				CL
		RA				I
	v	OPE						v
							X
B			v		X			K
	B	A		J

V Vent Terminal	X Air Supply Inlet	Area Where Terminal is NOT Permitted
Horizontal Vent Terminal Location

The following information should be used for determining the proper location of the vent terminal for direct vent water heaters.

		Canadian Installations 1	US Installations 2
A=	Clearance above grade, veranda,	12 inches (30 cm) above anticipated	12 inches (30 cm) above anticipated
	porch, deck or balcony.	snow level.	snow level.
B=	Clearance to window or door that may	6 inches (15 cm) for appliances < 10,000	6 inches (15 cm) for appliances < 10,000
	be opened.	Btuh (3 kW), 12 inches (30 cm) for appli-	Btuh (3 kW), 9 inches (23 cm) for appli-
		ances > 10,000 Btuh (3kW) and < 100,000	ances > 10,000 Btuh (3 kW) and
		Btuh (30kW), 36 inches (91 cm) for appli-	< 50,000 Btuh (15 kW), 12 inches
		ances > 100,000 Btuh (30kW).	(30 cm) for appliances > 50,000 Btuh
			(15 kW).
C= Clearance to permanently closed		*	*
	window.
D=	Vertical Clearance to ventilated soffit	3 feet (91 cm)	3 feet (91 cm)
	located above the terminal within a
	horizontal distance of 2 feet (61 cm)
	from the center line of the terminal.
E=	Clearance to unventilated soffit.	*	*
F=	Clearance to outside corner.	*	*
G=	Clearance to inside corner.	18 inches (46 cm)	18 inches (46 cm)

Figure 9 - Horizontal Vent Terminal Location

11