32
Support of Vent Stack
The weight of the vent stack or chimney must not rest
on the heater vent connection. Support must be pro-
vided in compliance with applicable codes. The vent
should also be installed to maintain proper clearances
from combustible materials.
Use insulated vent pipe spacers where the vent pass-
es through combustible roofs and walls.
NOTE: For additional information on appliance
categorization, see appropriate ANSI Z21 Standard
and the NFGC (U.S.), or B149 (Canada), or
applicable provisions of local building codes.
CAUTION: When condensate traps are installed,
condensate must be routed to an appropriate
container for treatment before disposal, as required
by local codes.
WARNING: Contact the manufacturer of the vent
material if there is any question about the appliance
categorization and suitability of a vent material for
application on a Category III or IV vent system.
Using improper venting materials can result in
personal injury, death or property damage.
NOTE: During winter months check the vent cap
and make sure no blockage occurs from build-up of
snow or ice.
Venting
General
F
lue Exhaust Tee
An optional Flue Exhaust Tee is available to facilitate
horizontal venting. Any reference to horizontal venting
that exits the back of the heater requires this tee. Refer
to Table K for the appropriate kit for your model.
Appliance Categories
Heaters are divided into four categories based on the
pressure produced in the exhaust and the likelihood of
condensate production in the vent.
Category I – A heater which operates with a non-pos-
itive vent static pressure and with a vent gas
temperature that avoids excessive condensate pro-
duction in the vent.
Category II – A heater which operates with a non-pos-
itive vent static pressure and with a vent gas
temperature that may cause excessive condensate
production in the vent.
Category III – A heater which operates with a positive
vent pressure and with a vent gas temperature that
avoids excessive condensate production in the vent.
Category IV – A heater which operates with a positive
vent pressure and with a vent gas temperature that
may cause excessive condensate production in the
vent.
See Table L for appliance category requirements.
Hi Delta units have internal fans, and carrying capacity
for CAT I vents is determined using the ‘Fan’ column.
CAUTION: Proper installation of flue venting is criti-
cal for the safe and efficient operation of the heater.
Model Diameter Order Number
992C 10” 011841
1262C, 1532C 12” 011842
1802C, 2002C,
2072C
14” 011843
2342C 16” 011844
Table K: Flue Exhaust Tee Kits
CAUTION: Condensate is acidic and highly
corrosive.
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