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.
An interrelated control apparatus for separately and selectively conjointly controlling a plurality of different load means, comprising first and second channels for providing separate load controls, a demand signal means connected to each of said channels for simultaneously signaling each channel, said first channel having an output means adapted to be connected to a first load and having a first means for developing an output signal related to said demand signal, said second channel including an output means adapted to be connected to a second load and having a second means for developing an output signal related to said demand signal, said second channel having an interlock means and a minimum load setting means, said interlock means including an override sensing input means and an adjustable setpoint means for generating a control signal at a selected sensed condition and said an interlock means connected in the second of said channels to selectively hold said channel in a standby position, and said minimum load setting means including an adjustable control means and connected to said second channel to maintain a minimum load setting signal independent of said demand signal.
Claim 2
Dependent Claim
188 words
An interrelated control apparatus for separately and selectively conjointly controlling a plurality of different load means, comprising first and second channels for providing separate load controls, a demand signal means connected to each of said channels for simultaneously signaling each channel, said first channel having an output means adapted to be connected to a first load and having a first means for developing an output signal related to said demand signal, said second channel including an output means adapted to be connected to a second load and having a second means for developing an output signal related to said demand signal, said second channel having an interlock means and a minimum load setting means, said interlock means including an override sensing input means and an adjustable setpoint means for generating a control signal at a selected sensed condition and said an interlock means connected in the second of said channels to selectively hold said channel in a standby position, and said minimum load setting means including an adjustable control means and connected to said second channel to maintain a minimum load setting signal independent of said demand signal.
Claim 3
Dependent Claim
37 words
The control apparatus of claim 1 having a presettable switch means coupled to said interlock means and to said minimum load means for selectively disabling said minimum load means in response to operation of the interlock means.
Claim 4
Dependent Claim
32 words
The apparatus of claim 2 wherein said presettable switch means includes a second signal input means to further control the minimum load means in accordance with the level of said second signal.
Claim 5
Dependent Claim
122 words
The control apparatus of claim 1 including an auxiliary output means connected to said interlock switch means to generate a related auxiliary signal, third and fourth load control channels, said third channel having a third input means connected to the output of the first channel and having an output adapted to be connected to said first load, said fourth channel having a fourth input means adapted to be connected to a second signal source and having an output adapted to be connected to a third load, an interlock means coupling said fourth input means to said third input means for conjointly controlling said first load, and a disable switch means coupled to said auxiliary output means to selectively actuate said interlock means.