Zero energy band subbase for pneumatic thermostats
AssigneeHoneywell Inc.
InventorGideon Shavit
Life of this patent
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Abstract
A pneumatic subbase for modifying the operation of a pneumatic thermostat is disclosed having a first nozzle to be connected to a source of main pressure, a second nozzle for supplying branch output pressure to the device being controlled, a third nozzle connected through the subbase to the first nozzle for supplying main pressure to a thermostat and a fourth nozzle connected to receive the output from the thermostat, the subbase having a dwell relay therein for providing a dwell in the branch output pressure of the second nozzle as a function of the pressure received from the thermostat at the fourth nozzle.
Claims6
A pneumatic subbase for modifying the operation of a pneumatic thermostat, said subbase comprising:
- first connecting means having a first nozzle adapted to be connected to a source of main pressure and a second nozzle adapted to supply a branch output pressure to a controlled apparatus;
- second connecting means comprising a third nozzle adapted to connect the main pressure from said first nozzle to a pneumatic thermostat and a fourth nozzle adapted to receive output pressure from said thermostat;
- and,
- dwell relay means for connecting directly said first nozzle to said third nozzle and connected to said second and fourth nozzles for providing a dwell period in the branch output pressure of said second nozzle as a function of the output pressure received by said fourth nozzle from said pneumatic thermostat, said dwell relay means comprising first, second and third diaphragm module units and a restriction.
Dependencies are inferred from the claim text.