MG & SG Series Boilers – Installation and Service Manual
9
Vent Terminal Information
The minimum distance from the termination of a vent terminal to adjacent public walkways, adjacent
buildings, openable windows and building openings shall be not less than those values specified in the
National Fuel Gas Code, ANSI Z223.1 and/or CAN/CGA Installation Codes.
For proper operation, the vent terminal must be kept free of snow and other debris at all times.
To prevent discoloration and degradation of building materials by flue gases and flue gas condensation,
ensure that the vent terminal is installed clear of nearby obstacles. In all cases, installation shall be in
accordance with code.
Maintain a minimum clearance of 4 feet (1.22 m) horizontally, and in no case above or below, unless a 4
foot (1.22 m) clearance is maintained from electric meters, gas meters, regulators and relief equipment.
Removal of an Existing Boiler
When an existing boiler is removed from a common venting system, the common venting system is likely
to be too large for proper venting of the appliances connected to it.
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
remaining connected to the common venting system are not in operation.
a) Seal any unused openings in the common venting system.
b) Visually inspect the venting system for proper size and horizontal pitch and determine there is no
blockage or restriction, leakage, corrosion and other deficiencies which could cause an unsafe
condition.
c) 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.
d) Place in operation the boiler being inspected. Follow the lighting instructions. Adjust the thermostat
so the boiler will operate continuously.
e) 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.
f) After it has been determined 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 any other gas burning appliance to their previous conditions of use.
g) Any improper operation of the common venting system should be corrected so the installation
conforms with the National Fuel Gas Code, ANSI Z223.1 and/or CAN/CGA Installation Codes. When
re-sizing 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 Installation Codes.
To Next Page
Loading...
Need help?
General
