Fig. 8: Minimum Clearances from Combustible
Surfaces – Outdoor Installations
Combustion and Ventilation Air
NOTE: Use of the heater in construction areas where fine particulate matter, such as concrete or drywall dust, is present may result in damage to the heater that is not covered by the warranty. If operat- ed in a construction environment, a clean source of combustion air must be provided directly to the heater.
Indoor Units
The heater must be supplied with sufficient quantities of
CAUTION: Combustion air must not be contami- nated by corrosive chemical fumes which can dam- age the heater and void the warranty. (See the Appendix.)
NOTE: It is recommended that the intake vent be insulated to minimize sweating.
Reversing Air Filter
Follow these instructions to change the air duct con- nection from the
1.Remove the four screws and the dust cover from the
2.Remove the four screws and the air filter bracket from the
3.Reverse the components and reattach in the new location, making sure that the air filter locking bracket is on the bottom. (The air filter locking bracket is reversible.)
Direct Vent
If outside air is drawn through the intake pipe directly to the unit for combustion:
1.Install combustion air direct vent in accordance with Fig. 26 (horizontal) or Fig. 27 (vertical) of this manual (pages 31 and 32, respectively).
2.Provide adequate ventilation of the space occu- pied by the heater(s) by an opening(s) for ventila- tion air at the highest practical point communicat- ing with the outdoors. The total
3.In cold climates, and to mitigate potential freeze- up, Raypak highly recommends the installation of a motorized sealed damper to prevent the circula- tion of cold air through the heater during the non- operating hours.
Direct-Ducted Combustion Air
In certain applications it may be desirable to duct the combustion air directly to the heater. This should be done with PVC, CPVC or
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