Fluid handling – Pressure modulating relays or followers – Plural series units
Patent
1979-11-09
1981-04-28
Tapolcai, Jr., William E.
Fluid handling
Pressure modulating relays or followers
Plural series units
236 49, G05D 1606
Patent
active
042639310
ABSTRACT:
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.
REFERENCES:
patent: 2977051 (1961-03-01), Parkas et al.
patent: 3085556 (1963-04-01), Peczkowski et al.
patent: 3587395 (1971-06-01), Nisley et al.
patent: 3806027 (1974-04-01), Ginn et al.
patent: 4044947 (1977-08-01), Spethmann
Bramow Scott B.
Laakaniemi Richard N.
Wichman Paul E.
Johnson Controls Inc.
Tapolcai, Jr. William E.
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