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3.0
Installation
•
Separated Combustion Systems
Optional Unvented Operation
Not for residential use. The use of unvented tube heaters in residential indoor spaces
may result in property damage, serious injury or death. Use unvented operation in
commercial and industrial installations with proper ventilation rates only.
When using an unvented configuration (commercial & industrial use only), consider the following:
• A factory vent cap/diffuser (P/N: WVE-GALV) must be used.
• Where unvented heaters are used, natural or mechanical means must be provided to
supply and exhaust a minimum of 4 CFM/1,000 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 feet.
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 3.25
•
Minimum End Clearances
12 in. Min.
All heaters
Combustion Air Requirements
Combustion air may be supplied to the heater by indoor or outdoor means.
If using combustion air intake from indoors, the required volume of the space must be a minimum of 50 ft
per 1,000 BTU/h (4.8 m
unusually tight construction with air infiltration rates of less than 0.40 air changes per hour, outside
combustion air is typically needed unless the sheer size of the building allows otherwise. Contact the
factory for further determination of air infiltration rates.
WARNING
!
/kW) unless the building is of unusually tight construction. If the building is of
3
36
DX3L
Series
12 in. Min.
unvented
heaters
3
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