Venting - Raypak 503A Installation & Operating Instructions Manual

Venting

General
CAUTION: Proper installation of flue venting is
critical for the safe and efficient operation of the
heater.
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.
Combustion
Air Supply
From Inside Building
(Non-Direct Venting)
From Outside Building
(Direct Venting)
Exhaust
Configuration
Vertical Venting
Horizontal
Through-the-Wall Venting
Vertical
Venting
Horizontal
Through-the-Wall Venting
Table J: Venting Category Requirements
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: 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.
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: Vent piping is hot.
mends the use of double wall or insulated wall pipe
to prevent personal injury.
NOTE: Ensure that clearances are maintained per
Tables C and D.
Heater Venting Certified
Category Materials
Category IV
IV Stainless Steel
26
Raypak recom-
Combustion Air
Inlet Material
UL Listed
Galvanized Steel
PVC
ABS
CPVC