Raypak 751 manual

Horizontal Thru-wall Direct Venting System with Add-on Condensing Heat Exchanger (Category IV) Installation

These installations utilize the boiler mounted blower to draw combustion air from outdoors and vent combus- tion products to the outdoors.

UL 1738 Certified Venting Material (e.g. AL29-4C) MUST be used. 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.

For certain installations, i.e. pool, heat-pump, domes- tic hot water supply with pre-heat tank, PVC or CPVC may be used. Contact manufacturer for details.

To prevent condensate accumulation in the vent, it is required to install the horizontal portion of vent with a slight upward slope of not more than 1/4" per foot of horizontal run and an approved condensate trap must be installed per applicable codes.

WARNING: For common vent installations, contact the factory.

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

The Stainless Steel non-restricted direct vent cap must be furnished by the boiler manufacturer in accordance with its listing.

Fig. 28: Vertical Direct Venting/Combustion Air with Add-on Condensing

Heat Exchanger (Category IV)

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