Hobart IB290 ML-110862, IB235 ML-110861 manual Gas Connection, Gas Pressure Specifications

GAS CONNECTION

For model IB57, the gas inlet pipe size is 1/2" NPT at the gas valve. For models IB140, IB235, and IB290, the gas inlet pipe size is 3/4" NPT at the gas valve. The gas supply line must be sized to adequately provide the input BTU/Hr rate for that model at the specified flowing pressure (see table).

The maximum inlet gas pressure must not exceed the Max value shown in the chart at right. The Min value is for the purposes of input adjustment.

The gas valve (Fig. 5) is provided with a pressure tap to measure the gas pressure downstream, which is also the manifold pressure.

Gas supply piping must have a sediment trap and a manual shutoff valve (supplied by others) installed outside of the rear cover panel, ahead of the booster heater's gas control (Fig. 5).

GAS PRESSURE SPECIFICATIONS

[ FLOWING GAS PRESSURE — NOT STATIC ]

Model	Inches W.C. (Water Column)
	Incoming Line Pressure		Manifold
Type of Gas
			Pressure
	Minimum	Maximum
IB57, IB140,
IB235, IB290	4.5	14.0	3.2
Natural Gas
IB57, IB140,
IB235, IB290	11	13	3.2
Propane

NOTE: DO NOT use teflon tape on gas line pipe threads. For gas line pipe connections, use LOCTITE 565, Hobart part 546292, or a flexible sealant suitable for use with Natural and LP Gases.

The heater and its gas connections must be leak tested before placing the appliance in operation. Use soapy water for leak test. DO NOT use open flame.

The heater and its individual shutoff valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of 1/2 psig (3.5 kPa).

The heater must be isolated from the gas supply piping system by closing its individual manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 psig (3.5 kPa).

Dissipate test pressure from the gas supply line before re-connecting the heater and its manual shutoff valve to the gas supply line. Caution: Failure to follow this procedure may damage the gas valve.

Model IB57 Models IB140 and IB235 Model IB290

Manual Valve

Gas Valve

Rear Panel

Sediment Trap

Manual Valve

NO OFF

Gas Valve

Rear Panel Sediment Trap

Manual Valve

Gas Valve

Rear Panel

Sediment Trap

PL-53289

Fig. 5

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