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CORROSIVE MATERIALS AND CONTAMINATION
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
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
WHEN USING AN EXISTING VENT SYSTEM TO
INSTALL A NEW WATER HEATER
Check the following venting components before installing:
• Material - For materials listed for use with this appliance, see
Venting Installation section on Page 17. For polypropylene or
stainless steel venting, an adapter of the same manufacturer
must be used at the flue collar connection.
• Size - To ensure proper pipe size is in place, see Table
8. Check to see that this size is used throughout the vent
system.
• Manufacturer - For a stainless steel or polypropylene
application, you must use only the listed manufacturers
and their type product listed in Tables 12 and 14 for CAT
IV positive pressure venting with flue producing condensate.
• Supports - Non-combustible supports must be in place
allowing a minimum 1/4" rise per foot. The supports should
adequately prevent sagging and vertical slippage, by
distributing the vent system weight. For additional information,
consult the vent manufacturer's instructions for installation.
• Terminations - Carefully review Venting Installation section
to ensure requirements for the location of the vent and
air terminations are met and orientation of these fit the
appropriate image from the Horizontal or Vertical options
listed in the Venting Installation section. For stainless
steel vent, only use terminations listed in Table 16 for the
manufacturer of the installed vent.
• Seal - With prior requirements met, the system should be
tested to the procedure listed in parts (3) through (6) of the
Removal of an Existing Water Heater section mentioned
below.
With polypropylene and stainless steel vent, seal and connect
all pipe and components as specified by the vent manufacturer
used; with PVC/CPVC vent, see the Installing Vent and Air Piping
section on Page 20. If any of these conditions are not met, the
existing system must be updated or replaced for that concern.
Failure to follow all instructions can result in flue gas spillage and
carbon monoxide emissions, causing severe personal injury or
death.
WHEN REMOVING A WATER HEATER FROM
EXISTING COMMON VENT SYSTEM
Do not install this water heater 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 substantial property damage. Failure to follow all instructions
can result in flue gas spillage and carbon monoxide emissions,
causing severe personal injury or death.
At the time of removal of an existing 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, 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 operate
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 the 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.
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 and/or
CAN/CSA B149.1, Natural Gas and Propane Installation
Code. 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 Part 11 of the National Fuel Gas Code,
ANSI Z223.1/NFPA and/or CAN/CSA B149.1, Natural Gas
and Propane Installation Code.
14
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