MC2: 10/03/12 Page
25
of
90
GF-115-H
TAG-0083_0B
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
•
Ph: 800-526-0288
CHAPTER 4:
GENERAL INFORMATION FOR VENTING
See Venting Guide
GF-115-V
for venting specifications and materials.
4.1 Vent Pipe Connection
The Modulex boiler is approved for a Category IV vent configuration as
well as for sealed combustion installations. Provisions for combustion
and ventilation air in accordance with Section 5.3, Air for Combustion
and Ventilation, of the National Fuel Gas code, ANSI Z223.1, or
Sections 7.2, 7.3, or 7.4 of CAN/CGA CSA B149.1, Installation codes,
or applicable provisions of the local building codes.
Maintain clearances from combustible construction for boiler, vent
connector, and steam and hot-water pipes.
4.2 Gas Vent Categories
Federal Codes have categorized gas appliances by the vented flue gas pressure and temperature.
These categories are defined as follows:
Category I
, being a gas appliance that operates with a non-positive vent (or natural drafted vent)
conne ctor with a flue gas pressure and temperature at least 140°F (60°C) above its dew point.
Category II
, being a gas appliance that operates with a non-positive vent (or natural drafted vent)
connector with a flue gas pressure and temperature less than 140 degrees F (60 degrees C)
above its dew point.
Category III
, being a gas appliance that operates with a positive vent (fan forced vent) connector
with a flue gas pressure and temperature at least 140 degrees F (60 degrees C) above its dew
point.
Category IV
, being a gas appliance that operates with a positive vent (fan forced vent) connector
with a flue gas pressure and temperature less than 140 degrees F (60 degrees C) above its dew
point.
Direct Vent
, a gas appliance is constructed and installed so that all air for combustion is derived
directly from the outdoors and all flue gases are discharged to the outdoors.
4.3 Installation And Sizing
The AERCO Venting Guide,
GF-115-V
, must be consulted before any flue gas vent or air inlet piping is
designed or installed. Certified venting materials specified in
GF-115-V
must be used for safety and
code compliance. Because the Modulex boiler is capable of discharging low temperature exhaust
gases, the flue must be pitched back to the unit a minimum of ¼” per foot to avoid any condensate
pooling and to allow for proper drainage.
For Side Wall Venting In Massachusetts
:
The vent termination must be located at a minimum of 4 feet above grade level. See
Section
1
of this manual for detailed information pertaining to side wall venting within the
Commonwealth of Massachusetts.
Pipe lengths and fittings must be calculated as part of the equivalent length. The pressure drop of the
vent and combustion air systems must not exceed 100 equivalent feet each. This
DOES
NOT
mean the
CAUTION
!
!
