Combustion and Ventilation AIR Indoor Units Only

COMBUSTION AND VENTILATION AIR (Indoor Units Only)

The heater must have both combustion and ventilation air. Minimum requirements for net free air supply open- ings are one opening that is 12 inches from the ceiling for ventilation, and one opening that is 12 inches from the floor for combustion air as outlined in the latest edition of the National Fuel Gas Code, ANSI Z223.1(Canada- CAN/CGA-B149.1 and B149.2) and any local codes that may have jurisdiction.

A.All Air From Inside The Building:

Each opening shall have a minimum net free area as noted:

Model	Square Inches	Model	Square Inches

206/207	200	336/337	333

266/267	266	406/407	399

B.All Air From Outdoors:

When air is supplied directly from outside of build- ing, each opening shall have a minimum net free area as noted:

Model	Square Inches

206/207	50

266/267	67

336/337	84

406/407	100

CAUTION: Combustion air must not be contaminated by corrosive chemical fumes which can damage the heater and void the warranty.

VENT PIPING

WARNING: Indoor heaters require a drafthood that must be connected to a vent pipe and properly vented to the outside. Failure to follow this procedure can cause fire or fatal carbon monoxide poisoning.

Vent piping the same size as the drafthood outlet is recommended, however, when the total vent height is at least 10 ft (drafthood relief opening to vent terminal), the vent pipe size may be reduced as specified in Chapter 10 of the National Fuel Gas Code, ANSI Z223.1 (Canada - CAN/CGA-B149.1 and B149.2). As much as pos- sible, avoid long horizontal runs of vent pipe and too many elbows. If installation requires horizontal runs, the vent pipe must have a minimum of 1/4 in. per ft rise and should be supported at not more than five foot inter- vals. Plumbers tape, criss-crossed, will serve to space both horizontal and vertical piping. Gas vents support- ed only by the flashing and extending above the roof more than five feet should be securely guyed or braced to withstand snow and wind loads. We recommend use of insulated vent pipe spacers through the roofs and walls. Another option for installation that requires horizontal runs is using the D-2 power vent kit option.

Power Vent Kit

Model Part No.

206/207 009832

266/267 009832

336/337 009833

406/407 009833

Optional Raypak D-2
Power Vent	Fig.# 9469

For more information consult the D-2 Power Vent manual, (Catalog No. 6000.57.1).

The power vent assembly is a fan-assisted combustion system designed for application to models 206-407. The unit, when installed as directed, is capable of operating in applications such as through-the-wall venting and reduced horizontal and vertical vent pipe sizes in new and current installations. The unit is factory-wired for 240 VAC, with capability of rewiring for 120 VAC.

For protection against rain or blockage by snow, the vent pipe must terminate with a vent cap which complies with the local codes or, in the absence of such codes, to the latest edition of the National Fuel Gas Code, ANSI