26
Combustion
Air Supply
Exhaust
Configuration
Heater Venting
Category
Certified
Materials
Combustion Air
Inlet Material
Vertical
Venting
From Inside Building
(Non-Direct Venting) Horizontal Through-
the-Wall Venting
Vertical
Venting
From Outside Building
(Direct Venting)
Horizontal Through-
the-Wall Venting
II and IV
Stainless Steel
UL listed
Galvanized Steel
PVC
ABS
CPVC
Table J: Venting Category Requirements
Venting
General
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 J for appliance category requirements.
CAUTION:
Proper installation of flue venting is
critical for the safe and efficient operation of the
heater.
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.
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 IV vent system. Using
improper venting materials can result in personal
injury, death or property damage.
CAUTION:
Condensate drains for the vent piping
are required for installations of the MVB. Follow vent
manufacturer instructions for installation and location
of condensate drains in the vent. Condensate drain
must be primed with water to prevent gas flue leak
and must be routed to an appropriate container for
neutralization before disposal, as required by local
codes.
NOTE:
Ensure that clearances are maintained per
Tables C and D.
CAUTION:
Vent piping is hot. Raypak recom-
mends the use of double wall or insulated wall pipe
to prevent personal injury.
Summary of Contents for 2503
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