FULTON PHW 1000, Installation, Operation And Maintenance Manual

Page: 36 / 94

Fulton Heating Solutions, Inc. -- PHW Manual -- 2010-0713
Page 36
17. Air Intake Supply Piping Installation Preparation
a) The boiler is equipped with air intake supply and exhaust vent connections located at the
top and rear of the boiler respectively.
b) Air supply is on the top. See Figure 6. For Models PHW300 and PHW500 these
connections are 3" NPT threaded female fittings and for Models ,PHW750, PHW950,
PHW1000, and PHW1400 they are 4" NPT thread female fittings. These fittings will
accept 3" and 4" male/female pipe to tubing adaptors respectively. Model PHW2000 has
6” NPT threaded female fitting.
c) For sealed combustion applications, air intake must be piped out of the building. Air
Intake pipes and fittings for all models shall be Schedule 40 PVC pipe. All Schedule 40
PVC pipe, fittings, primer and cement must conform with American National Standard
Institute and the American Society for Testing and Materials (ANSI/ASTM standards).
d) For applications using make up air from the boiler room, a minimum of 10’ of venting
including the intake muffler must be installed. Per ASME Section VI Para. 6.04, an
unobstructed air ventilation opening should be sized on the basis of one square inch free
area per 2000 BTU/HR maximum fuel input of the combined burners located in the boiler
room. This is subject to state and local regulations. The installation of exhaust fans in a
boiler room is not recommended.
e) All alternative individual venting arrangements must result in an intake pressure drop not
to exceed 2.5” w.c. (Consult factory for assistance.)
f) All common venting arrangements must result in a pressure drop of less than 0.1” w.c.in
the common header. (Consult factory for assistance.)
Figure 6