Field Instruments

General

The GAO-, GMH- and GML-A4… ventless pressure switches are adjustable pressure switches for automatic burner controls.These pressure switches are suitable for making and/or breaking a circuit whenthe medium pressure changes relative to the set point. The set point can be set in the field by an adjustable dial with an integrated scale. Test nipple integrated in metal housing to verify set point.

Application

The GAO-, GMH-, and GML-A4… pressure switch is recommended for industrial and commercial heating, ventilation and air-conditioning systems. The GAO-, GMH-, and GML-A4… pressure switch is suitable for dry natural gas, propane, butane, air and other inert gases. Suitable for up to 0.1 % by volume, dry H2 S. A “dry” gas has a dew point lower than +15 °F and its relative humidity is less than 60 %.

Specifications

• Make: DUNGS
• Part Number: GMH-A4-1-8
• Order Number: 298106
• Setting range in. W.C: 40.00 – 200.00
• Max. operating pressure: 14 PSI (1000 mbar)
• Max. body pressure: 15 PSI (1033 mbar)
• Pressure connectionStandard: 1/4" NPT female thread centered underside of housing.
• Electrical ratings
  • AC eff.  min. 24 V max. 240 V
  • DC   min. 24 V max. 48 V
• Indication light:

Energy consumption

0.1 W max. @ 120 VAC

0.5 W max. @ 24 VDC/AC

• Electrical connection: Screw terminals via 1/2" NPT conduit connection
• Enclosure rating: NEMA 1 or NEMA 4
• Setting tolerance: ±15% switching point deviation referred to set point. Adjusted as pressure rises or as pressure falls, vertical diaphragm position.
• Vent Limiter: Incorporates 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.

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