Globe's Models H-2 Air Pressure Maintenance Devices is an automatic, field-adjustable device that controls the on-off cycling of an air compressor.
MODELS H-2 AND H-3 AIR MAINTENANCE DEVICEGFV-520 (.pdf) Download
Model H-2 and H-3 – Air Pressure Maintenance Device: Where a field-adjustable, pressure reducing type air maintenance device is required to control the on-off cycling of the systems air pressure as provided by an air compressor in dry pipe, preaction type, and dry-pilot lines of deluge systems they shall be specifically listed for such use. The air pressure maintenance device is utilized in applications where an air compressor is installed and it is necessary to monitor the systems air pressure and automatically cycle the air compressor on and off to maintain the systems pressure within “Low and High” preset air pressure limits. The device shall be designed for a “quick-fill” per the requirements of NFPA; as well as a regulator and metering orifice to replace air pressure automatically into the sprinkler system to make-up for small naturally occurring air pressure loses. The air pressure maintenance device shall be UL listed and FM approved. Air Pressure Maintenance Device shall be Model H-2 or Model H-3; as manufactured by Globe Fire Sprinkler Corporation.
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