Raypak 302B, 902B manual Vertical Venting Category, Vent Terminal Location, Condensate Management

WARNING: Contact the vent material manufacturer if there are any questions about the appliance category or suitability of a vent material for Category II, III or IV applications. Using improper venting materials can result in personal injury, death or property damage.

Vent Terminal Location

NOTE: During winter months check the vent cap and make sure no blockage occurs from build-up of snow or ice.

1.Condensate can freeze on the vent cap. Frozen condensate on the vent cap can result in a blocked flue condition.

2.Give special attention to the location of the vent termination to avoid possibility of property dam- age or personal injury.

3.Gases may form a white vapor plume in winter. The plume could obstruct a window view if the ter- mination is installed near windows.

4.Prevailing winds, in combination with below-freez- ing temperatures, can cause freezing of condensate and water/ice build-up on building, plants or roof.

5.The bottom of the vent terminal and the air intake shall be located at least 12 in. above grade, includ- ing normal snow line.

6.Un-insulated single-wall metal vent pipe shall NOT be used outdoors in cold climates for venting gas utilization equipment.

7.Through-the-wall vents for Category II and IV appliances shall not terminate over public walk- ways or areas where condensate or vapor could create a nuisance or hazard, or be detrimental to the operation of regulators, relief valves or other equipment.

8.Locate and guard vent termination to prevent acci- dental contact by people or pets.

9.DO NOT terminate vent in window well, stairwell, alcove, courtyard or other recessed area, unless previously approved by local authority.

10.DO NOT terminate above any door, window, or gravity air intake. Condensate can freeze, causing ice formations.

11.Locate or guard vent to prevent condensate from damaging exterior finishes. Install a rust-resistant sheet metal backing plate against brick or mason- ry surfaces.

12.DO NOT extend exposed vent pipe outside of building. Condensate could freeze and block vent pipe.

Condensate Management

Condensate must be routed from the condensate trap to an appropriate container for neutralization before disposal, as required by local codes.

Vertical Venting (Category II)

Note: When vertical height exceeds 25 ft,

consult factory prior to installation.

*Requires optional vent tee for rear discharge.

Fig. 38: Vertical Venting (Category II)

CAUTION: A properly sized listed vent cap terminal must be used to evacuate the flue products from the boilers.

Common Venting System

Manifolds that connect more than one boiler to a com- mon chimney must be engineered to handle the combined load. Consult available guides for proper sizing of the manifold and the chimney. At no time should the area of the vent be less than the area of the largest boiler exhaust outlet.

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