Appliances Remaining On An Existing Vent System; When Removing A Boiler From An Existing Common Vent System; Existing Vent Test Procedure - Weil-McLain Ultra Commercial Installation And Start-Up Manual

COMMERCIAL GAS

Appliances remaining on an existing vent system

Do not install the Ultra boiler into a com-
mon vent with any other appliance. This
will cause flue gas spillage or appliance
malfunction, resulting in possible severe
personal injury, death or substantial prop-
erty damage.
Existing common vent systems may be too
large for the appliances remaining connect-
ed after the existing boiler is removed.
Failure to follow all instructions can result
in flue gas spillage and carbon monoxide
emissions, causing severe personal injury
or death.
When removing a boiler from an
existing common vent system
. When an existing boiler is replaced with an Ultra
boiler, the Ultra boiler CANNOT use the existing common vent.
The Ultra boiler requires its own vent and air piping, as specified
in this manual. This may cause a problem for the appliances that
remain on the old common vent, because the vent may be too
large. The following test is intended to check for proper operation
of the appliances remaining on the old common vent system.
Vent system verification
At the time of removal of an existing boiler, 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. Seal any unused openings in the common
venting system.
28
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FIRED WATER BOILER
— Boiler Manual

Existing vent test procedure

(The following is intended to test whether the
appliances remaining on an existing vent system
will operate satisfactorily.)
1. Visually inspect the venting system for proper size and hori-
zontal pitch and determine there is no blockage or restriction,
leakage, corrosion or other deficiencies which could cause
an unsafe condition.
2. Test vent system — Insofar as is practical, close all build-
ing 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 exhausts, so they will operate
at maximum speed. Do not operate a summer exhaust fan.
Close fireplace dampers.
3. Place in operation the appliance being inspected. Follow the
lighting instructions. Adjust thermostat so appliance will
operate continuously.
4. Test for spillage at draft hood relief opening after 5 minutes of
main burner operation. Use the flame of a match or candle,
or smoke from a cigarette, cigar, or pipe.
5. After it has been determined that each appliance remaining
connected to the common venting system properly vents
when tested as outlined herein, return doors, windows,
exhaust fans, fireplace dampers, and any other gas-burning
appliance to their previous conditions of use.
Any improper operation of common venting system should be
corrected so the installation conforms with the National Fuel
Gas Code, ANSI Z223.1 — latest edition. Correct by re-sizing to
approach the minimum size as determined using the appropriate
tables in Part 11 of that code. Canadian installations must comply
with B149.1 or B149.2 Installation Code.
Part number 550-100-086/0809