Detroit Radiant Products Company LS3 Series - Manual (Page 33)

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LS3 Series 3.0 Installation • Combustion Air Supply • Optional Unvented Operation
When using an unvented configuration (commercial & industrial use only), consider the following:
• A factory vent cap/diffuser (P/N: WVE-3) must be used.
• Where unvented heaters are used, natural or mechanical means must be provided to
supply and exhaust a minimum of 4 cfm/1000 Btu/h input of installed heaters.
NOTE: Gravity or mechanical means may be used to accomplish the air displacement.
Local codes may require that the mechanical exhaust system be interlocked with the
electrical supply line to the heaters, enabling both to function simultaneously.
• The minimum clearance between the air intake and the exhaust terminal is 4 ft.
NOTE: When installing in a U-tube configuration, use extra caution to separate vent gases
from heater intake.
• Exhaust openings for removing the flue products must be located above the level of the
heater(s).
Figure 3.23 • Minimum End Clearances
12 in. Min.
Unvented
heaters
12 in. Min.
All heaters
WARNING
!
This appliance must be vented in residential installations. Unvented tube heaters in
residential spaces may result in property damage, serious injury or death. Use unvented
operation in commercial and industrial installations with proper ventilation rates only.
Optional Unvented Operation
Non-contaminated outside air for combustion must be ducted to the heater if any of the following apply:
• Chemicals such as chlorinated or fluorinated hydrocarbons (typical sources are refrigerants,
solvents, adhesives, degreasers, paints, paint removers, lubricants, pesticides, etc.) are present in
the atmosphere.
• High humidity.
• Contaminants such as sawdust, welding smoke, etc.
• Negative building pressure.
• Unusually tight construction where there is an air infiltration rate of less than 0.40 per hour.