Form: 2435
Revision: 9
Free Flex Installation and Operation Manual
Date: 9-1-2017
Bryan Steam LLC, 783 N Chili Ave, Peru IN 46970
Web:
www.
bryanboilers
.com
Phone:
765-473-6651
Fax:
765-473-3074
Email:
19
b.
Refer to the appropriate drawings in
Appendix D of this manual to
determine common acceptable
configurations of the vent system.
WARNING
Improper venting may result in property
damage and the release of flue gasses that
contain deadly carbon monoxide (CO)
into the building, which can cause severe
personal injury and/ or death.
WARNING
Do not use a barometric damper with this
boiler. This is a positive pressure system.
The use of a barometric damper may
cause flue gases to leak into the boiler
room.
3.4.1
Category II Venting
Category II venting is an engineered system
and shall be designed by a qualified vent
manufacturer and “APPROVED” by the local
authority. The boiler manufacturer takes no
responsibility for vent systems that create
issues and or affect the performance of the
boiler. All jurisdictional codes shall apply in
addition to the following.
1.
Common vents serving multiple boilers
shall be designed for negative pressure so
that flue gasses will not expel to the room
through a boiler on standby.
2.
Common venting with other appliances is
prohibited.
3.
Vent systems shall be designed to
maintain a negative 0.001 iwc to negative
0.1 iwc draft at all times from the
minimum firing rate to the maximum
firing rate measured at the outlet of the
boiler.
4.
A mechanical draft fan may be required to
maintain the required negative draft.
5.
Vertical venting is recommended. Other
horizontal and vertical arrangements may
be acceptable if proven by the vent
manufacturers design calculations.
6.
It is recommended that combustion air be
taken from the boiler room. Follow the
guidelines in section 3.3 Other
arrangements may be acceptable if
proven by the vent manufacturers design
calculations.
7.
It is recommended that a Carbon
Monoxide detector be installed and
interlocked to the boiler. Consult your
local jurisdiction for additional
requirements.
Boiler
Model
Flue Gas
Flow,
ACFM
@40%XSA
200
o
F
Comb Air
Req. SCFM
@40%XSA6
0
o
F
Flue
Size
FF
1000
301
220
6”
FF
1500
452
330
8”
FF
2000
603
441
8”
FF
2500
753
550
10”
FF
3000
904
661
10”
Table 4: Combustion Air and Flue Gas
Requirements
WARNING
A poorly designed Category II negative
vent system can produce positive
pressures in the vent that can spill into the
room and adjoining spaces that can cause
severe personal injury and / or death.