Weil-McLain 2 Series Manual page 26

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SlimFit Series 2
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Appliances remaining on an existing vent system
Do not install the SlimFit boiler into a common
vent with any other appliance. This will cause flue
gas spillage or appliance malfunction, resulting in
possible severe personal injury, death or substan-
tial property damage.
Existing common vent systems may be too large
for the appliances remaining connected 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
replaced with a SlimFit boiler, the SlimFit boiler CANNOT use the
existing common vent. The SlimFit 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 opera-
tion 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 remain-
ing connected to the common venting system are not in operation.
Seal any unused openings in the common venting system.
26
COMMERCIAL CONDENSING GAS
Both 5 feet
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FIRED WATER BOILER
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PVC can only be used on the exhaust of a boiler
after 10 linear feet of CPVC pipe.
All fittings within the first 10 feet must be CPVC.
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 horizontal
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 building doors
and windows and all doors between the space in which the appli-
ances 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 the common venting system should be
corrected so the installation conforms with the National Fuel Gas
Code - ANSI Z223.1/NFPA54 – latest edition, and/or the Natural
Gas and Propane Installation Code, Natural Gas and Propane Instal-
lation Code - CAN/CSA B149.1. When resizing any portion of the
common venting system, the common venting should be resized to
approach the minimum size as determined using the appropriate
tables in Chapter 13 of the National Fuel Gas Code - ANSI Z223.1/
NFPA54 – latest edition, and/or the Natural Gas and Propane Instal-
lation Code, CAN/CSA B149.1.
Part number 550-100-180/0917