Fulton Heating Solutions, Inc. -- PHW Manual -- 2010-0713
Page 39
19. Exhaust Vent Piping Installation Preparation
Note
A Fulton Pulse boiler should not be connected to a common venting system with
other types of gas appliances.
a) The boiler is equipped with an exhaust vent connection located at the rear of the boiler.
For models PHW300 up through the PHW1400, the connection is 4” NPT threaded
female. Model PHW2000, the connection is 6” NPT threaded female.
b) The exhaust line must be sloped down toward the boiler with a pitch of at least 1/4" per
foot. Failure to do so can result in a condensate pocket which can result in an inoperative
boiler. There must be no low spots in the exhaust pipe, as this can also result in a
condensate pocket. A high spot is acceptable, provided the pitch from the high spot is
maintained back to the boiler to the outside point of the exhaust. In supporting piping, or
routing it through a rafter or wall, always use vibration eliminating hangers around the
piping to prevent vibration transmission. Always avoid rigid connections between piping
and structural members of the building.
c) All alternative individual venting arrangements must result in an exhaust pressure drop
not to exceed 4.0” w.c. (Consult factory for assistance.)
d) All common venting arrangements must result in a pressure drop of -0.1” to 0.0” w.c if not
using a draft assist fan. (Consult factory for assistance.)
e) All common venting arrangements must result in a pressure drop of 0.0” to 0.75” w.c.
with the use of a draft assist fan. (Consult factory for assistance.)
f) Variable speed exhaust fan pressure setting should be no more than 0.1” w.c.
g) Flue vent pipes and fittings for all Pulse boilers must be UL listed for use with Category
IV, positive pressure, condensing equipment. Specifically this material is AL294C.
Stainless Steel 316L piping is also acceptable. At 480°F temperature rating, a 5”
minimum air space clearance to combustibles is required. Applicable Federal Codes are
NFPA 54/ANSI Z223.1 National Gas Code and NFPA/ANSI 211 Chimneys, Fireplaces,
Vents and Solid Fuel Burning Appliances. In Canada, refer to the venting section of
CAN/CGA B149.1 and .2. The gas vent installer should be familiar with these federal
codes as well as any local codes and regulations that may apply. The procedure for
adhesive joining stainless steel pipe and fittings follows:
1. Do not mix stainless steel pipe with galvanized or other alternatives for the entire
length of the system.
2. All joints between sections of the vent connector and the vertical conduit must be
sealed with a high temperature sealant or gasket to prevent any possible leakage
of flue gas.
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