Dungs Pressure Switch For Gas & Air GAO-A4…, GMH-A4…, GML-A4…
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Dungs Pressure Switch For Gas & Air GAO-A4…, GMH-A4…, GML-A4…

The GAO-, GMH- and GML-A4…vent-less pressure switches are adjustable pressure switches for automatic burner controls.  These pressure switches are suitable for making and/or breaking a circuit when the 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 verity 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 H2S.

A “dry” gas has a dew point lower than +15° F and its relative humidity is less than 60%.

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Additional information

Spec 1

GAO-A4…SPDT pressure switch requires no auxiliary power. The GAO-A4… is suitable for making and/or breaking a circuit when the set point is exceeded or undershot. A tripped switch is indicated by a neon light after set point is exceeded or undershot. Automatic reset when pressure returns below or above set point.

Spec 2

GMH-A4… SPDT pressure switch requires no auxiliary power. The GMH-A4… is suitable for making and/or breaking a circuit when the set point is exceeded. A tripped switch is indicated by a neon light after set point is exceeded. Manual reset is required to reset the switch.

Spec 3

GML-A4… SPDT pressure switch requires no auxiliary power. The GML-A4… is suitable for making and/or breaking a circuit when the set point is undershot. A tripped switch is indicated by a neon light after set point is undershot. Manual reset is required to reset the switch.

Spec 4

Max. Body Pressure: 15 PSI (1033mbar)

Spec 5

Pressure Connection: Standard: 1/4" NPT female thread centered underside of housing.

226357_GAS_PRESSURE_SWITCH_A4.pdf