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Gas-Fired Boiler Installation
9
Vent Termination
The vent must be provided with a weather cap of ap-
proved design and adequate capacity.
3.6.6 Removing an Existing Boiler
(from a common venting system)
When an existing boiler is removed from a common
venting system, the common venting system is likely
to be too large for proper venting of the appliances
remaining connected to it.
At the time of removal of an existing boiler, while the
other appliances remaining connected to the common
venting system are not in operation, the following
steps should be followed with each appliance remain-
ing connected to the common venting system placed 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 that there is no
blockage or restriction, leakage, corrosion or other
deficiency 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 com-
mon venting system are located and other spaces
of the building. Turn on clothes dryers and any
appliances not connected to the common venting
system. Turn on any exhaust fans, such as range
hoods and bathroom exhausts, so they will operate
at maximum speed. Do not operate a summer ex-
haust fan. Close fireplace dampers.
4. Place the appliance being inspected in operation.
Follow the lighting instructions. Adjust the ther-
mostat so that the appliance will operate continu-
ously.
5. Test for spillage at the draft hood relief opening
after 5 minutes of main burner operation. Use the
flame of a match or candle or smoke from a ciga-
rette, cigar or pipe.
6. After it has been determined that each appliance
remaining connected to the common venting sys-
tem properly vents when tested as outlined above,
return doors, windows, exhaust fans, fireplace
dampers, and any other gas-burning appliance to
their previous conditions of use.
Any improper operation of the common venting sys-
tem should be corrected so the installation conforms
with the National Fuel Gas Code, ANSI Z223.1.
When resizing any portion of the common venting sys-
tem, the common venting system should be resized to
approach the minimum size as determined using the
appropriate tables in Part II in the National Fuel Gas
Code, ANSI Z223.1.
3.7
GAS PIPING
Before making the gas hook-up, make sure the boiler
is being supplied with the type of fuel shown on the
boiler nameplate.
The boiler shall be installed such that the gas ignition
system components are protected from water (drip-
ping, spraying, rain, etc.) during appliance operation
and service (circulator replacement, control replace-
ment, etc.)
The gas train components are designed to handle a
maximum inlet pressure of 14 inches water column
(1/2 psig.). If the available gas pressure exceeds 14
inch w.c., a suitable additional intermediate gas pres-
sure regulator of the "lock up" type must be provided
to reduce the pressure to less than 14 inch w.c.
Correct Listed
Termination
Incorrect
Termination
(
too restrictive
)