Raypak HD401, HD101 operating instructions Horizontal Thru-wallDirect Vent Termination

Horizontal Thru-wall Venting System (Category III) Installation

These installations utilize the heater-mounted blower to vent the combustion products to the outdoors. Combustion air is taken from the space and the vent is installed horizontally through the wall to the outdoors. Adequate combustion and ventilation air must be sup- plied in accordance with the NFGC or, in Canada, the B149 Installation Code.

The total length of the horizontal thru-wall exhaust vent system should not exceed one hundred (100) feet in length. If horizontal run exceeds 100 feet, an appro- priately sized extractor must be used. Each elbow used is equal to ten (10) feet of straight pipe. This will allow installation in one of the four following combina- tions.

·100’ of straight flue pipe.

·90' of straight flue pipe and one elbow.

·80' of straight flue pipe and two elbows.

·70' of straight pipe and three elbows.

·60' of straight pipe and four elbows.

The vent cap is not considered in the overall length of the venting system. The vent must be installed to pre- vent the flue gas leakage. Care must be taken during assembly to ensure that all joints are sealed properly and are airtight.

The horizontal portions of the vent shall also be sup- ported for the design and weight of the material employed to maintain clearances and to prevent phys- ical damage or separation of joints.

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 flue exhaust 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.

Multiple direct vent caps MUST NOT be installed with one combustion air inlet directly above a direct vent cap. This vertical spacing would allow the flue prod- ucts from the direct vent cap to be pulled into the combustion air intake installed above. This type of installation can cause non warrantable problems with components and poor operation of the unit due to the recirculation of flue products. Multiple direct vent caps should be installed in the same horizontal plane with a three (3) foot clearance from the side of one vent cap to the side of the adjacent vent cap(s).

Combustion air supplied from outdoors must be free of particulate and chemical contaminants. To avoid a blocked flue condition, keep the vent cap clear of snow, ice, leaves, debris, etc.

WARNING: No substitutions of flue pipe or vent cap material are allowed. Such substitutions would jeopardize the safety and health of inhabitants.

The flue exhaust direct vent cap must be furnished by the heater manufacturer in accordance with its listing. Use only the special gas vent pipes listed for use with Category III gas burning heaters, such as the stainless steel vent by Heat Fab Inc (800-772-0739), Protech Systems, Inc. (800-766-3473) or Z-Flex (800- 654-5600). Pipe joints must be positively sealed. Follow the vent manufacturers installation instructions carefully.

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