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34-53 08/14
5.5 Gas Connection
1. Safe operation of unit requires adequate gas supply with the required static and dynamic (flow) pressures. Actual
piping selection depends on many variables that must be carefully considered by the gas piping system designer.
Do not select gas pipe sizes based only on the supplied tables. These tables are for use by the gas piping
system designer as a reference in checking pipe size selections.
2. Gas pipe size may be larger than boiler connection.
3. Installation of a union is suggested for ease of service.
4. Install a manual main gas shutoff valve, outside of the appliance gas connection and before the provided
appliance manual shutoff gas valve, as required by the National Fuel Gas Code.
5. The gas system installer should clearly identify the emergency shut-off device.
6. A sediment trap (drip leg) MUST be provided in the inlet of the gas connection to the unit.
7. The code compliant vent limiters are designed and must respond to pressure changes in the installation
environment, as opposed to outdoor pressure. For proper operation, do not connect to outdoor atmosphere.
5.6 Gas Train and Controls Certification
NOTE: The gas train and controls assembly provided on this unit have been tested under the applicable Nationally
Recognized Standard to comply with safety and performance criteria such as proper ignition, combustion and safety
shutdown operation.
5.7 Gas Control Trains
All models include gas control trains with the following components: main gas cock, two safety shutoff valves,
proportionator regulator and a final manual shutoff valve with the manifold pressure tap on the side of the valve.
These components may be separate or two or more may be combined in a common housing.
CAUTION: Do not adjust or remove any screws or bolts on gas train control components which are sealed with a red
or blue colored compound. Doing so will void all approvals and warranties.
6 COMBUSTION AND VENTILATION AIR
Provisions for adequate combustion and ventilation air to the mechanical room must be in accordance with Section
5.3, Air for Combustion and Ventilation of the latest edition of the National Fuel Gas Code, ANSI Z223.1 and/or
CAN/CSA B149, Installation Codes or applicable provisions of the local building codes.
6.1 Equipment Located In Confined Spaces
Equipment located in confined spaces requires two openings installed within 12" (30.5 cm) from the top and bottom
of the room to assure adequate combustion air and proper ventilation. The total input of all gas utilization equipment
installed in the room must be used to determine the required minimum air volume needed for combustion, ventilation
and dilution of flue gasses.
• All Air From Outdoors:
Each opening requires a minimum free area of 1 square inch
per 4000 Btu/hr input if directly communicating
with the outdoors or communicating to the outdoors through vertical ducts.
Each opening requires a minimum free area of 1 square inch
per 2000 Btu/hr input if communicating with the
outdoors through horizontal ducts.
• All Air From Inside The Building:
Each opening requires a minimum free area of 1 square inch
per 1000 Btu/hr input, but not less than 100 square
inches (0.06 m
2)
.
• Combination Of Air From The Indoors And From The Outdoors:
Refer to National Fuel Gas Code, ANSI Z223.1 and/or CAN/CSA B149, Installation Codes or applicable
provisions of the local building codes.
NOTE: This unit may be installed with a remote air intake system which uses a make-up air duct to draw combustion
air directly from outdoors. (See Vertical and Horizontal Remote Air.)
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