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Arctic Installation and Operation Manual
P/N 105641-01
are not leaking by. During commissioning,
the remainder of the gas train joints down
stream of the main motorized gas valve shall
be tested for leaks.
3.2.7.3 Venting of Gas Train Components
The MBC (gas valve) has an internal, factory
installed vent limiter re ANSI Z21.18/ CSA
6.3. Venting required unless otherwise
accepted by the authority having jurisdiction.
The high and low gas pressure switches
incorporate a vent limiter as per UL 353 and
limits the escape of gas less than 1.0 CFH of
natural gas at 7 PSI if internal switch
diaphragm ruptures.
3.3
Combustion Air Supply System
For proper combustion it is necessary to
provide the boiler room with appropriate
openings for fresh air supply. Temporary air
intakes such as windows and doors should be
avoided since they may be closed. In addition
to air needed for combustion, sufficient air
must be supplied for ventilation as well as
other air consuming equipment that may be
present in the boiler room. Often when
personnel are working in the boiler room,
combustion air openings are closed due to the
temperature of the outside air. THIS MUST
BE AVOIDED AT ALL COSTS! Provisions
should be made to heat the outside
combustion air, if necessary, for personnel
comfort.
Positive means for supplying an ample
amount of outside air, allowing for the
complete combustion of the gas, must be
provided.
Movable combustion air dampers, automatic
or manually adjustable, must be electrically
interlocked with the boiler to prevent boiler
operation if the dampers are closed.
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Combustion air openings must never be
blocked or obstructed in any manner.
The boiler room must be at a positive or
neutral pressure relative to the outdoors. A
negative in the boiler room will result in
downdraft problems and incomplete
combustion due to the lack of air.
WARNING!
Failure to provide an adequate air supply
will result in boiler damage and hazardous
conditions in the building (fire and
asphyxiation hazard as well as equipment
damage).
3.3.1 Combustion Air Openings:
The design of combustion air openings
MUST comply with local and/or State codes
or the authority having jurisdiction. As a
minimum, combustion air openings to the
boiler room shall be provided as follows:
NOTICE
Combustion air provided solely from an
indoor source is discouraged.
dimension for a round or rectangular
opening shall be less than 3".
3.3.1.1 Two Permanent Opening Method
One opening starting within 12" of the top of
the boiler room and one starting within 12" of
the bottom of the boiler room shall be
provided. The openings shall be open directly
to the outside or ducted directly to the
outside.
www.thermalsolutions.com
sales@thermalsolutions.com
Form: 2435-3
Revision: 10
Date: 12-1-2018
No
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