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US 4,283,007 AGranted
Multiple load integrated fluid control units
AssigneeJohnson Controls GmbH
InventorsScott B. Bramow, Richard N. Laakaniemi, Paul E. Wichman
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AssigneeJohnson Controls GmbH
InventorsScott B. Bramow, Richard N. Laakaniemi, Paul E. Wichman
Estimating the term…
A mixed air conditioning controller is formed as a factory assembled and adjusted unit in a compact housing, with simple and direct input/output field connectors. Various temperature and humidity input devices are field connected to produce a sequenced control of the air dampers and mechanical cooling and heating devices, as well as auxiliary devices. The controller includes a primary input related to room demand, an outside air temperature input, with an interlocked control to the damper, a fan status input, a minimum air supply control and a by-pass switch having a low limit input. The logic network connecting the input/output includes pneumatic switching, pressure selecting and comparing devices of a diaphragm-controlled-orifice construction connected to function as fluidic repeaters, pressure regulating valves and pressure isolating and switching devices. The controller includes a conditioning channel and a damper channel. An outside air interlock controls the damper channel and a presettable switch controls the minimum air supply control. The presettable switch also includes a low limit temperature signal input. An auxiliary output may drive a humidity controller having a conditioning channel and a humidity channel. The humidity controller includes an interlock network connected to transfer the humidity input signal to the conditioning channel and a switch means controlled by the auxiliary output of the temperature controller.
A humidity logic control unit for connection to a temperature control unit generating a temperature control signal and an outside air temperature related switchover signal, comprising a first temperature channel having a first input means adapted to be connected to receive the control signal and an output means adapted to be connected to a conditioning means, a second humidity channel having a second input means adapted to be connected to a humidity demand signal source and an output means adapted to control a humidification means, an interlock means operable to connect the second input means to control the output of the first channel conjointly with said first channel input, a switchover fluid repeater having an input chamber adapted to receive said switchover signal and having an output chamber, a first fluid switch having an input chamber adapted to be connected to said fluid repeater and an output chamber connected to said interlock means to selectively actuate said interlock means and thereby control the output of the first channel in accordance with the relative level of signal levels at the first and second inputs, and a second fluid switch having an input chamber adapted to be connected to said fluid repeater to respond to said switchover signal and connected to hold said second channel inactive.
Dependencies are inferred from the claim text.