76mm (3 in.) |
|
| • Support all horizontal pipe runs every 1.2m (4 ft.) and all | ||||
TERMINATION MAY BE |
|
| vertical pipe runs every 1.5m (5 ft.) or according to local | ||||
MIN. LENGTH |
|
| |||||
| 90° ELBOW OR A “T” |
|
| codes. |
|
|
|
| ELBOW |
| • |
|
|
| |
|
|
| Vents run through unconditioned spaces where below | ||||
|
|
|
| freezing temperatures are expected, are not recom- | |||
|
|
|
| mended. |
|
|
|
|
|
| • If a run through an unconditioned space is unavoidable, | ||||
|
|
|
| the pipe must be insulated to reduce condensation. | |||
| 450mm (18 in.) |
| • | The length and number of the 90° elbows must be kept | |||
|
|
| to a minimum. |
|
|
| |
|
|
|
|
|
|
| |
|
|
| • | No | |||
|
|
| • | If | |||
| ROOF |
|
| where possible, to minimize the number of 90° elbows | |||
|
|
| used. |
|
|
| |
| LINE |
| • |
|
|
| |
|
|
| Do not use short radius elbows. |
|
|
| |
|
|
| • | No Street elbows | |||
|
|
| • | Pipes must be cut at a 90° angle. |
|
|
|
|
|
| • Deburr the outside and inside of the cut pipe so that sol- | ||||
|
|
|
| vent cement is not pushed away by sharp edges. | |||
A VENT USED IN A SPECIAL VENTING SYSTEM WITH POSITIVE VENT PRES- |
| • | Dry fit all pipes and fittings before joining the parts with | ||||
SURE AND PASSING THROUGH A ROOF SHALL EXTEND AT LEAST 450mm (18 |
|
| solvent cement. |
|
|
| |
in.) ABOVE THE HIGHEST POINT WHERE IT PASSES THROUGH THE ROOF |
| • | Parts must fit well and not put stress on any sections. | ||||
SURFACE AND ANY OTHER OBSTRUCTION WITHIN A HORIZONTAL DIS- |
| ||||||
TANCE OF 450mm (18 in.). A VERTICAL VENTING SYSTEM MUST BE SUP- |
|
|
|
|
|
| |
PORTED EVERY 2.4m (8 ft.). |
|
|
|
|
|
|
|
Figure 11 Vertical Venting |
|
|
|
|
|
|
|
2. Must provide proper support for all pipes protruding |
|
|
|
|
|
| |
through roof. |
|
|
|
|
|
|
|
3. The vertical roof terminations should be sealed with a |
|
|
|
|
|
| |
plumbing roof boot or equivalent flashing. |
|
| STREET ELBOW | NORMAL ELBOW | |||
The specifications are displayed in Figure 11. |
|
| |||||
|
|
|
|
|
| ||
Vent Pipe Installation |
|
|
|
|
|
|
|
Refer to Table 2 for maximum and minimum vent length. |
|
|
|
|
|
| |
Plan the vent system layout so that proper clearances are |
|
|
|
| 150mm |
| |
|
|
|
| (6 in.) min. |
| ||
maintained from plumbing and wiring. Vent pipes serving |
|
|
|
|
| ||
|
|
|
|
|
| ||
power vented appliances are classified by building codes as |
|
|
|
|
|
| |
"vent connectors". Required clearances from combustible |
|
| BACK TO BACK ELBOWS |
|
|
| |
materials must be provided in accordance with information |
|
|
|
|
|
| |
|
|
|
|
|
| ||
in this manual under "Location Of Heater" and with the lat- |
|
|
|
|
|
| |
est edition of "Natural Gas and Propane Installation |
|
|
|
|
|
| |
Code" |
|
|
|
|
|
| |
Code" ANSI Z223.1 (NFPA 54) (U.S.A.) and local codes. |
|
|
|
|
|
| |
1. Construct and route vent pipe connections to the water |
|
|
|
|
|
| |
heater. |
|
|
|
|
|
|
|
2. Ensure all vent components fit properly. |
|
|
|
|
|
| |
3. When all the components | fit properly apply solvent |
|
| PREFERRED PRACTICE | |||
cement to join them permanently. |
|
|
|
|
|
| |
4.Proceed to attach the venting system to the rubber cou- Figure 12 Venting Examples pling of the water heater (see Figures 15 & 16).
Important: The following guidelines, and those shown in |
|
|
|
Figures 12 & 13 are good, recommended practice for vent- |
|
|
|
ing installations. Applicable local codes supersede this set |
|
|
|
of venting guidelines: |
|
|
|
• Venting should be as direct as possible with a minimum |
|
|
|
number of pipe fittings. |
|
|
|
• Vent diameter must not be reduced unless specifically |
|
|
|
90° LONG SWEEP ELBOW | 90° SHORT SWEEP ELBOW | ||
noted in the installation instructions. | EQUIVALENT TO 1.5m (5 ft.) |
| EQUIVALENT TO 2.4m (8 ft.) |
OF STRAIGHT PIPE |
| OF STRAIGHT PIPE | |
|
| ||
| Figure 13 Correct Pipe Fittings |
| |
– 13 –
