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Finned copper tube gas boilers & water heaters – Boiler Manual
6
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Intake air option – Horizontal guidelines
Th e maximum equivalent length for the horizontal intake air pipe is
100 ft , 30.5 m. Each 90
o
elbow and the intake air terminal are equal
to 10 linear ft , 3.0 m of pipe. If horizontal runs exceed 5 ft , 1.5 m
they must be supported at 3 ft , 0.9 m intervals with overhead hangers.
Th e certifi ed intake air terminal from RBI must be used, see Figure 1,
page 8, Figure 2, page 8 and Figure 4, page 9.
GENERAL VENTING GUIDELINES
The vent installation must be in accordance with
Part 7, Venting of Equipment, of the National
Fuel Gas Code, ANSI Z223.1/NFPA 54–
latest revision or applicable provisions of the local
building codes. Canadian installations must comply
with CAN/CGA B149.1 or .2 Installation Code.
Improper venting can result in excessive levels of
carbon monoxide which can result in severe personal
injury or death!
All vent systems must be fully supported by the building structure
and not by the boiler/water heater. Appropriate thimbles and fi re-
stops must be used where required.
Common vent systems must be properly engineered
and sized to provide a negative draft of 0.03 inch,
0.8 mm to 0.1 inch, 2.5 mm W.C. at the flue outlet.
Common positive pressure vent systems are not to be
used. Improper installation can result in excessive levels
of carbon monoxide which can cause severe personal
injury or death!
Common-vent systems —
The boiler closest to
the vertical vent must be assigned as the master
boiler and always fi red FIRST to ensure proper
draft and reliable operation
. Consult the factory
if any questions. Improper installation can result in
excessive levels of carbon monoxide which can cause
severe personal injury or death!
EXISTING COMMON VENT SYSTEMS
If an existing boiler/water heater is removed from an existing
common venting system, the common venting system may then
be too large for the proper venting of the remaining appliances
connected to it. At the time of removal of an existing boiler/water
heater, the following steps shall be followed with each appliance
remaining connected to the common venting system placed in
operation, while the other appliances remaining connected to the
common venting system are not in operation.
1. Seal any unused openings in the common venting system.
2. Visually inspect the venting system for proper size and horizontal
pitch and determine there is no blockage or restriction, leakage,
corrosion and other defi ciencies which could cause an unsafe
condition.
3. Insofar as is practical, close all building doors and
windows and all doors between the space in which the
appliances remaining connected to the common venting
system are located and other spaces of the building. Turn
on clothes dryers and any appliance not connected to the
common venting system. Turn on any exhaust fans, such
as range hoods and bathroom exhaust, so they will operate at
maximum speed. Do not operate a summer exhaust fan for a
boiler installation. Close fi replace dampers.
4. Place in operation the appliance being inspected. Follow the
lighting instructions. Adjust thermostat so appliance will operate
continuously.
5. Test for spillage at the draft hood relief opening aft er 5 minutes
of main burner operation. Use the fl ame of a match or candle, or
smoke from a cigarett e, cigar or pipe.
6. After it has been determined that each appliance remaining
connected to the common venting system properly vents when
tested as outlined above, return doors, windows, exhaust fans,
fi replace dampers and any other gas-burning appliance to their
previous condition of use.
7. Any improper operation of the common venting system should
be corrected so the installation conforms with the National Fuel
Gas Code, ANSI Z223.1/NFPA 54. When resizing any portion
of the common venting system, the common venting system
should be resized to approach the minimum size as determined
using the appropriate Tables in Appendix F in the National Fuel
Gas Code, ANSI Z223.1/ NFPA 54 and or CAN/CGA B149
Installation Codes.
VENT SYSTEM OPTIONS
The flue products in the vent system may be cooled below their
dew point and form condensate in the fl ue. Th e materials used for a
Category IV vent must be resistant to any corrosive damage from fl ue
gas condensate. Th e fl ue from a Category IV vent system must have
a condensate drain with provisions to properly collect and dispose
of any condensate that may occur in the venting system.
Category IV vent/air piping lengths must not exceed
100 equivalent feet. If longer runs are required, use a
Category II (negative pressure) vent system, specially
engineered/designed to meet all applicable codes.
The Futera XLF may be vented the following ways:
1.
OPTION 1 — Direct Vent, Positive Pressure
Category IV (individual venting only) (page 7)
Combustion air is piped from the outdoors to the blower
inlet. Vent system is certifi ed to UL 1738 for installations
in the United States, ULC S636 for installations in Canada.
Maximum equivalent length of vent and air piping must not
exceed 100 feet each.
2.
OPTION 2 — Vertical Vent, Positive Pressure
Category IV (individual venting only) (page 10)
Combustion air is obtained from the space in which the unit is
installed. Vent system is certifi ed to UL 1738 for installations
in the United States, ULC S636 for installations in Canada.
Maximum equivalent length of vent piping must not exceed
100 feet.
