Use of Solvent Cement and Primer, Used

Venting instructions

10. Insert the vent piping through this hole and secure into

1. Plan the venting layout starting at the vent termination

position. Connect the vent pipe to the end termination

and work back toward the heater. Take into considera-

elbow as shown in Figures.9-11.

tion the style and position of the vent termination, the

vent pipe routing, elbows and connectors required and

the necessary support hangers.

2. G/JW 40, 50 and 60-gallon heaters may use 50mm (2

in.) or 76mm (3 in.) venting depending on "Equivalent

Vent Length" as described in Table 2. G/JW5065 high

SEALANT

input models require 76mm (3 in.) venting. See also the

ATTACH 90°

section on "Vent pipe connection to blower".

TERMINATION

Venting should be as direct as possible with the fewest

ELBOW

VENT PIPING MAY BE

number of fittings. Use long radius 45 degree and long

RODENT SCREEN

SLOPED IN

ANY

radius 90 degree elbows wherever possible.

DIRECTION, AS LONG

4. Do not use 90 degree elbows "back to back" (other than

(INSTALL INTO

AS A WATER TRAP IS

ELBOW)

NOT

CREATED IN

termination installations) and do not use street elbows.

300mm

THE VENTING SYS-

Maintain a minimum 150mm (6 in.) straight section

(12 in.)

GROUND LEVEL

SEALANT

TEM.

THE

SLOPE

MIN.

OR MAXIMUM

SHOULD BE KEPT TO

between elbows. Closely coupled and short radius

SNOW LINE*

A MINIMUM

SO AS

elbows reduce the venting capacity (see Figure 6 and

NOT TO EXERT ANY

UNDUE STRESS ON

the note below it).

THE PIPE.

DO NOT USE AN ELBOW AS A SUPPORT POINT.

* WHERE SNOW COVER IS NORMAL DURING WINTER, ENSURE

Elbows are not designed to carry the weight of the vent-

SUFFICIENT VENT CLEARANCE TO PREVENT BLOCKAGE OR ICE BUILDUP.

ing system.

Figure 9 Vent Termination Exterior Installation

6. Calculate "Equivalent Vent Length" before starting. Do

not exceed the values shown in Table 2. An example of

ATTACH 90°

BRACKET

how this length is determined is shown in Figure 8. The

TERMINATION

ELBOW

value from your calculations should also be used to

determine which rodent screen to install into the vent

termination elbow.

RODENT

EQUIVALENT

7. Measure the vent piping and cut to required lengths.

SCREEN

VENT LENGTH

(INSTALL

MEASURED FROM

Pipes must be cut at right angles and deburred to

INTO

THIS POSITION

ensure a good smooth fit with sufficient overlap for the

ELBOW)

SEALANT

300mm

glue joints. Correct any interference conditions.

(12 in.)

VENT

8. Provide support hangers for horizontal vent piping every

MIN.

RISER

1.2m (4 ft.) to prevent sagging and stress. Provide a

GROUND LEVEL

VENT PIPING TO BE

minimum of 3mm (1/8 in.) rise per 1.2m (4 ft.) of vent

OR MAXIMUM

SNOW LINE*

SLOPED (DOWN)

piping to ensure adequate drainage. Horizontal vent

SEALANT

TOWARD HEATER TO

piping must not sag to form valleys where condensate

PREVENT WATER

FROM COLLECTING.

may collect. Vertical venting shall be supported every

1.5m (5 ft.). Use appropriate support straps and vibra-

* WHERE SNOW COVER IS NORMAL DURING WINTER, ENSURE

tion isolators (foam pads) on straight sections only. Do

SUFFICIENT VENT CLEARANCE TO PREVENT BLOCKAGE OR ICE BUILDUP.

not use elbows as support points. Allow sufficient clear-

Figure 10 Installation Of Fabricated Vent Riser.

ance for expansion and contraction of the venting sys-

tem.

76mm (3 in.)

TERMINATION

MIN. LENGTH

9. At the point where the vent pipe exits the building, cut a

MAY BE 90°

ELBOW

65mm (2-1/2 in.) hole for 50mm (2 in.) venting or a

90mm (3-1/2 in.) hole for 76mm (3 in.) venting.

A VENT USED IN A SPECIAL

CAUTION:

RODENT

VENTING SYSTEM

WITH

SCREEN

450mm