Installation & Service Manual
3Gas connections
Gas Supply | Gas Pressure Test |
Verify that the appliance is supplied with the type gas specified on the rating plate. This appliance is orificed for operation up to 2000 feet altitude. The appliance will be derated 4% per 1000 feet above 2000 feet elevation. Consult the factory for installations above 2000 feet elevation. Field conversions for operation at high altitude must be performed by certified personnel only. The appliance will be marked to indicate suitability for high altitude operation.
GAS SUPPLY PRESSURE: Measured at the inlet pressure tap located upstream of the combination gas valve(s) see FIG.
TABLE - 3A
GAS SUPPLY PRESSURE
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Max. (Inches Water Column) |
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14 | 14 | |
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Min. (Inches Water Column) | 4.5 | 11 |
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Maximum inlet gas pressure must not exceed the value specified. Minimum value listed is for the purposes of input adjustment.
MANIFOLD PRESSURE: Measured at the pressure tap on the downstream side of the combination gas valve(s) (see FIG.
| TABLE - 3B |
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MANIFOLD PRESSURE |
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Input Gas |
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Full or High Fire | Low Fire Settings | ||||
Btu/hr | Settings | ||||
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| Natural | LP Gas | Natural | LP Gas | |
| Gas |
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45,000 | 3.5" | 10" | 0.9" | 2.5" | |
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75,000 | 2.4" | 7" | 0.9" | 2.5" | |
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90,000 - 180,000 | 3.5" | 10" | 0.9" | 2.5" | |
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215,000 - 260,000 | 3.5" | 10" | 0.9" | 2.5" | |
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18 
1.The appliance must be disconnected from the gas supply piping system during any pressure testing of that system at a test pressure in excess of 1/2 PSIG (3.5kPa).
2.The appliance must be isolated from the gas supply piping system by closing a manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 PSIG (3.5kPa).
3.The appliance and its gas connection must be
Gas Connection
1.Safe operation of the appliance requires properly sized gas supply piping. See data in Table 3C.
2.Gas pipe size may be larger than appliance gas connection.
3.Installation of a union is suggested for ease of service, see FIG.
4.Install a manual main gas shutoff valve, outside of the appliance gas connection and before the gas valve or manifold connection, when local codes require.
5.A trap (drip leg) MUST be provided by the installer in the inlet of the gas connection to the appliance, see FIG.
6.The combination gas valve has an integral vent limiting device and does not require venting to atmosphere, outside the building.
7.Optional gas controls may require routing of bleeds and vents to the atmosphere, outside the building when required by local codes.
TABLE - 3C
FITTINGS TO EQUIVALENT STRAIGHT PIPE
Diameter Pipe (inches)
3/4 | 1 | 1 1/4 | 1 1/2 | 2 | 3 | 4 | 5 |
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| Equivalent Length of Straight Pipe (feet) |
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2 | 2 | 3 | 4 | 5 | 10 | 14 | 20 |
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TABLE - 3D
GAS CONNECTIONS
Btu/hr | Pipe Size | |
INPUT | ||
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45,000 - 135,000 | 1/2" | |
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180,000 - 260,000 | 3/4" | |
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