
QTD2
Series
19
3.0
Installation
•
Replacing Existing Equipment
Figure 3.10
•
Minimum End Clearances
12 in.
Min.
to End
6 in.
Min.
to Back
If replacing an existing heater, vents may require re-sizing. Improperly sized venting
systems can result in vent gas leakage or condensation. Refer to the National Fuel Gas
Code ANSI Z223.1 (NFPA 54) or CSA B149.1 - latest edition. Failure to follow these
instructions can result in serious injury or death.
WARNING
!
When using an unvented configuration
(commercial & industrial use only)
, consider the following:
• A factory supplied (sold separately) vent cap/diffuser (P/N: TP-6189)
must
be used.
• Where unvented heaters are used, natural or mechanical means
must
be provided to supply
adequate ventilation - a minimum of 4 CFM/1000 BTU/h (0.38 m
3
/kW) 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.
• Exhaust openings for removing the flue products must be located above the level of the
heater(s).
WARNING
!
Not for residential use
. The use of unvented radiant 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.
Unvented Operation
Replacing Existing Equipment
If the heater is replacing existing equipment and using an existing vent system, inspect the venting for
proper size and horizontal pitch as directed in these instructions and the latest edition of the National Fuel
Gas Code, ANSI Z223.1 (NFPA 54) or CSA B149.1 Installation Code.
Determine that there is no blockage or restriction, leakage, corrosion, or other deficiencies that can cause
hazards. The vent pipe should be corrosion-resistant galvanized steel of a thickness that meets the
National Fuel Gas Code. Minimum thickness for connectors varies depending on the pipe diameter.
Never vent the QTD2 Series with PVC or plastic pipe.