MC2: 10/03/12 Page
26
of
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AERCO International, Inc.
•
100 Oritani Dr.
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Blauvelt, NY 10913
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Ph: 800-526-0288
GF-115-H
OMM-0083_0B
Modulex MLX Series Gas Fired Boiler System
Operation and Maintenance Manual
Chap 4: General
Venting Information
allowed combined pressure drop between the vent and combustion air is 200 equivalent feet. That is,
the vent cannot go above 100 equivalent feet, even if the combustion air is less than 100 equivalent
feet, and vice versa. (See
GF-115-V
for detailed sizing guidelines.)
The combustion air must be free of chlorine, halogenated hydrocarbons, or other chemicals that can
become hazardous when used in gas-fired equipment. Common sources of these compounds are
swimming pools, degreasing compounds, plastic processing compounds and refrigerants. Whenever
the environment contains these types of chemicals, combustion air must be supplied from a clean area
outdoors for protection and longevity of the equipment.
The Modulex is
CSA
listed for 100% sealed combustion or can be installed using room air as long as
there is an adequate supply. (See
GF-115-V
for detailed sizing guidelines.)
4.4 Existing Boiler Removal From Common Venting System
At the time of removal of an existing boiler, the steps as shown in the instructions below, 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.
Existing Boiler Removal from Common Venting System
1. Seal any unused openings in the common venting system.
2. Visually inspect venting system for proper size and horizontal pitch and determine there are no
blockages or restrictions, leakage, corrosion and other deficiencies that could cause an unsafe
condition.
3. When practical, close all building doors and windows as well as 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 any appliances not connected to the common venting system, such
as clothes dryers. 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. Turn on 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 a
match or candle flame, or smoke from a cigarette, cigar or pipe.
6. After determining that each appliance remaining connected to the common venting system properly
vents when tested as outlined above, return doors, windows, exhaust fans, fireplace dampers and
other gas-burning appliance to their previous state of use.
7. Any improper operation of the common venting system should be corrected so the installation
conforms to the National Fuel Gas code, ANSI Z223.1 and/or CAN/CGA B149, Installation Codes.
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 and/or CAN/CGA B149, Installation Codes.
