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GSW Gas Fired Water Heater User Manual

Page 7

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TERMINATION MAY BE

90 DEGREE ELBOW

OR A “T” ELBOW

3” MIN. LENGTH

ROOF

LINE

18”

VERTICAL VENTING

(MUST BE SUPPORTED EVERY 8’)

A vent used in a SPECIAL VENTING SYSTEM with positive vent

pressure and passing through a roof shall extend at least 18

inches (450 mm) above the highest point where it passes through

the roof surface and any other obstruction within a horizontal dis-

tance of 18 inches (450 mm)

Figure 3 - 2

STREET ELBOW

BACK TO BACK ELBOWS

NORMAL ELBOW

PREFERRED PRACTICE

Figure 4

6” min.

(152 mm)

2) VENT CONNECTIONS TO THE WATER

HEATER

IMPORTANT GUIDELINES

These venting guidelines are good, recommended

practice for venting installations. Applicable local codes

supersede this set of venting guidelines. See Figure 4.

1. The length and number of the 90 degree elbows

must be kept to a minimum.

2. No back-to-back 90 degree elbows should be

used.

3. 45 degree elbow should be used where possible to

minimize the number of 90 degree elbows in case

re-direction of flue gas are required.

4. Do not use short radius elbows.
5. No female-male (Street nineties) should be used.
6. Pipe must be cut at a right angle.
7. Deburr cut pipe outside and inside so that solvent

cement is not pushed away by sharp edges.

8. Dry fit all pipes and fittings before joining the parts

with solvent cement.

9. Parts must fit well without putting stress on any sec-

tions.

Refer to Table VI for maximum and minimum vent

length. Construct vent pipes connecting to the water

heater. Horizontal runs may slope in any direction as

long as a water trap is not created in the venting sys-

tem. The horizontal runs must not sag or form valleys

where condensation might collect. To avoid this situa-

tion, provide support for the runs at a maximum 4 feet.

All Power Vented water heaters generate a certain

amount of operational noise. In order to minimize noise

transmission to floor joists though hangers, place some

soft material such as foam rubber, approximately 1/2”

thick, between hangers and the vent pipes. Ensure that

all vent components fit properly. Apply solvent cement

and join all parts permanently.

Apply solvent cement to join the termination assembly

to the venting system inside the building. Seal around

the vent terminal where it passes through the wall,

inside and out with silicone sealant caulking. Proceed

to attach the venting system to the rubber coupling of

the water heater.

CAUTION

Use of Solvent Cement and Primer:

Use only in well-ventilated areas. Do not

use near flame or open fire. Solvent

cements for plastic pipe are flammable liq-

uids and must be kept away from all

sources of ignition.