Table of Contents
Advertisement
WM97+
-
gas
fired water boiler
Venting/air piping — general
Do not install the WM97+ boiler into a common vent with
any other appliance. This will cause flue gas spillage or ap-
pliance malfunction, resulting in possible severe personal
injury, death or substantial 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
The WM97+ boiler cannot be common vented with any other ap-
pliance
. When an existing boiler is replaced with an WM97+ boiler, the
WM97+ boiler CANNOT use the existing common vent. The WM97+
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 com-
mon vent system.
Vent system verification
Perform the test sequence below for
original common vent system. Operate each appliance individually, with
other appliances turned off. This procedure will test whether the common
vent system can properly vent each appliance.
Existing vent test procedure
(The following is intended to test whether the appliances remaining
on an existing vent system will operate satisfactorily.)
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 or
other deficiencies which could cause an unsafe condition.
3. Test vent system — 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 exhausts, so they will oper-
ate at maximum speed. Do not operate a summer exhaust fan. Close
fireplace 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 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.
6. 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 550-142-120/0113
— Boiler Manual
each
appliance remaining on the
You must pipe combustion air to the
boiler air intake
Install air inlet piping for the WM97+
boiler as described in this manual.
The air termination fitting must be in-
stalled with the clearances and geometry
relative to the vent outlet depicted in this
manual to ensure that flue products do
not enter the air intake.
Ensure that the combustion air will not
contain any of the contaminants in Fig-
ure 16. Do not pipe combustion air near a
swimming pool, for example. Avoid areas
subject to exhaust fumes from laundry
facilities. These areas will always contain
contaminants.
Contaminated combustion air will dam-
age the boiler, resulting in possible severe
personal injury, death or substantial
property damage.
Figure 16
Corrosive contaminants and sources
Products to avoid
Spray cans containing chloro/fluorocarbons
Permanent wave solutions
Chlorinated waxes/cleaners
Chlorine-based swimming pool chemicals
Calcium chloride used for thawing
Sodium chloride used for water softening
Refrigerant leaks
Paint or varnish removers
Hydrochloric acid/muriatic acid
Cements and glues
Antistatic fabric softeners used in clothes dryers
Chlorine-type bleaches, detergents, and cleaning
solvents found in household laundry rooms
Adhesives used to fasten building products and other
similar products
Excessive dust and dirt
Areas likely to have contaminants
Dry cleaning/laundry areas and establishments
Swimming pools
Metal fabrication plants
Beauty shops
Refrigeration repair shops
Photo processing plants
Auto body shops
Plastic manufacturing plants
Furniture refinishing areas and establishments
New building construction
Remodeling areas
Garages with workshops
.
– 19 –
Advertisement
Table of Contents
