Raypak 751 Operations Instructions download pdf (Page 27)

e) Terminate vent at least six (6) feet away from adja-

cent walls.

f) DO NOT terminate vent closer than five (5) feet

below roof overhang.

Canadian Installations

Refer to the latest edition of CSA B149 Installation

Code.

A vent shall not terminate:

a) Directly above a paved sidewalk or driveway

which is located between two single family

dwellings and serves both dwellings.

b) Less than 7 ft. (2.13m) above a paved sidewalk or

paved driveway located on public property.

c) Within 6 ft. (1.8m) of a mechanical air supply inlet

to any building.

d) Above a meter/regulator assembly within 3 ft.

(900mm) horizontally of the vertical center-line of

the regulator.

e) Within 6 ft. (1.8m) if any gas service regulator vent

outlet.

f) Less than 1 ft. (300mm) above grade level.

g) Within 3 ft (1m) of a window or door which can be

opened in any building, any non-mechanical air

supply inlet to any building to the combustion air

inlet of any other appliance.

h) Underneath a verandah, porch or deck, unless:

(i) the verandah, porch or deck is fully open on a

minimum of two sides beneath the floor, and

(ii) the distance between the top of the vent termi-

nation and the underside of the verandah,

porch or deck is greater than 1 ft (30cm).

Venting Installation Tips

Support piping:

· horizontal runs- at least every five (5) feet.

· vertical runs - use braces:

· under or near elbows

Follow items listed below to avoid personal injury or

property damage.

· Cut nonmetallic vent pipe with fine-toothed hacksaw

(34 teeth per inch).

· Do not use nonmetallic vent pipe or fittings that are

cracked or damaged.

· Do not use nonmetallic vent fittings if they are cut or

altered.

· Do not drill holes, or use screws or rivets, in non-

metallic vent pipe or fittings.

To make metallic vent joints:

· Do not install seams of vent pipe on bottom of runs.

· Completely seal all joints and seams with silicone

sealant.

Venting Configurations

The following is a detailed explanation of each venting

system WITHOUT and WITH add-on condensing heat

exchanger (CHX), its installation requirements, the

components used, and part numbers for each.

For boilers connected to gas vents or chimneys, vent

installations shall be in accordance with Part 7,

Venting of Equipment, of the latest edition of National

Fuel Gas Code, or in Canada, the latest edition of CSA

B149 Installation Code for Gas Burning Appliances

and Equipment, or applicable provisions of local build-

ing codes.

NOTE: For direct vent installations where the air is

piped in from outside, the protective screen on the

combustion air blower may be relocated to the air

inlet termination elbow to act as an inlet screen.

NOTE: The words "Flue Exhaust", "Flue" and

"Exhaust Vent" are used interchangeably.

WARNING: Examine the venting system at least

once a year. Check all joints and vent pipe

connections for tightness, corrosion or deterioration.

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Raypak 751 Operations Instructions Page 27

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