Raypak 503-2003 manual Combustion and Ventilation Air, Outdoor Installations, Indoor Units

SECTION C: Installation

Venting not shown for clarity. Heater must be vented

per instructions in this manual

Fig. 6: Minimum Clearances from Combustible Surfaces – Indoor and Outdoor Installations

When installed according to the listed minimum clear- ances from combustible construction, these heaters can still be serviced without removing permanent structural construction around the heater. However, for ease of servicing, we recommend a clearance of at least 24 in. in front, at least 24 in. on the rear and 10 in. above the top of the heater. This will allow the heater to be ser- viced in its installed location without movement or removal of the heater.

Service clearances less than the minimum may require removal of the heater to service either the heat ex- changer or the burner components. In either case, the heater must be installed in a manner that will enable

the heater to be serviced without removing any struc- ture around the heater.

Outdoor Installations

These heaters are design-certified for outdoor installa- tion. Heaters must not be installed under an overhang that is less than 3 ft from the top of the vent terminal. Three sides must be open in the area under the over- hang. Roof water drainage must be diverted away from heaters installed under overhangs.

Heater	Min. Clearance	Recommended
	from Combustible	Service
Side
	Surfaces	Clearance
Rear	12”	24”
Right Side	1”	1”
Left Side	1”	1”
Top	Unobstructed	Unobstructed
Vent	12”	12”
Termination

Table E: Clearances – Outdoor Installations

The combustion air intake terminal MUST be used for outdoor installations. The hood is shipped loose and installed on the rear of the heater at the jobsite.

Combustion and Ventilation Air

NOTICE: Use of the heater in construction areas where fine particulate matter, such as concrete or dry- wall dust, is present may result in damage to the burner that is not covered by the warranty. If operated in a construction environment, a clean source of combus- tion air must be provided directly to the heater.

Indoor Units

The heater must be supplied with sufficient quantities of non-contaminated air to support proper combustion and equipment ventilation. Combustion air can be sup- plied via conventional means where combustion air is drawn from the area immediately surrounding the heater, or via direct vent, where combustion air is drawn directly from outside. All installations must comply with the requirements of the NFGC (U.S.) and B149.1 (Canada), and all local codes.

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