33
LD3
Series
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 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 3.24
•
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
3.0
Installation
•
Optional Unvented Operation