Raypak 751 Operations Instructions download pdf (Page 31)

Horizontal Thru-wall Direct Venting

System (Category III) Installation

These installations utilize the boiler-mounted blower to

vent the combustion products to the outdoors.

Combustion air is taken from inside the room and the

vent is installed horizontally through the wall to the out-

doors. Adequate combustion and ventilation air must

be supplied to the boiler room in accordance with the

National Fuel Gas Code or, in Canada, the latest edi-

tion of CSA B149 Installation Code for Gas Burning

Appliances and Equipment.

The total length of the thru-wall exhaust vent system

cannot exceed sixty-five (65) feet in length for the flue

outlet. Each elbow used is equal to ten (10) feet of

straight pipe. This will allow installation in one of the

four following combinations:

· 65′ of straight flue pipe.

· 55′ of straight flue pipe and one elbow.

· 45′ of straight flue pipe and two elbows.

· 35′ of straight pipe and three elbows.

The direct vent cap is not considered in the overall

length of the venting system. The vent must be

installed to prevent the flue gas leakage. Care must be

taken during assembly to ensure that all joints are

sealed properly and are airtight.

The vent must be installed to prevent the potential

accumulation of condensate in the vent pipes. It is rec-

ommended that:

a) The vent be installed with a slight downward slope

of not more than 1/4" per foot of horizontal run to

the vent terminal.

b) The vent be insulated through the length of the

horizontal run.

For appliances installed in extreme cold climate, it is

recommended that:

a) The vent be installed with a slight upward slope of

not more than 1/4" per foot of horizontal run to the

vent terminal. In this case, an approved conden-

sate trap must be installed per applicable codes.

b) The vent be insulated through the length of the

horizontal run.

Horizontal Thru-wall Direct Vent

Termination

The direct vent cap MUST be mounted on the exterior

of the building. The direct vent cap cannot be installed

in a well or below grade. The direct vent cap must be

installed at least one (1) foot above ground level and

above normal snow levels. The Raypak supplied direct

vent cap must be used.

The Stainless Steel direct vent cap must be fur-

nished by the boiler manufacturer in accordance

with its listing.

WARNING: No substitutions of flue pipe or vent

cap material are allowed. Such substitutions would

jeopardize the safety and health of inhabitants.

WARNING: For common vent installations, contact

the factory.

Fig. 23: Horizontal Thru-Wall Direct

Venting/Combustion Air

(Category III)

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Raypak 751 Operations Instructions Page 31

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