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2 INSTALLATION
2.9 Installation for Unvented Operation
(OPTIONAL)
NOTE: Not for Residential Applications.
The heaters are approved for unvented operation
when equipped with a factory-supplied end
cap/diffuser. Part No. DB-3VCF (see Figure 2.9.1).
This allows the products of combustion to be
discharged from the units into the space being
heated.
Ventilation of the space is required to dilute
those products of combustion sufficiently.
For proper ventilation, it is recommended
that a positive air displacement of at least
3.8 cfm per 1000 BTUh of natural gas input
be provided.
END
THE MINIMUM END CLEARANCE FOR ALL MODELS IS 12 IN. or 30.5cm
If propane is used, a positive air displacement of at
least 4.5 cfm per 1000 BTUh of gas input is
recommended. This air displacement may be
accomplished by either gravity or mechanical means.
Provisions must be made for a sufficiently large
fresh-air intake area and exhaust-air outlet area, to
accomplish the 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.
Figure 2.9.1
Figure 2.9.1
19
END
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