Thermostat apparatus for use with temperature control system
First Claim
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1. A thermostat apparatus comprising a thermostat and a positioner for establishing the actuation temperature for the thermostat, the thermostat comprising a wax motor comprising a piston, and the positioner comprising an output member having at least two positions, each representing a predetermined actuation temperature for the thermostat and a piston stroke limiter to limit motion of the piston upon motion of the output member beyond one of its two positions to establish one of the predetermined actuation temperatures.
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Abstract
A thermostat apparatus is provided. The thermostat apparatus comprises a thermostat and a positioner for establishing different operating temperatures for thermostat.
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20 Claims
- 1. A thermostat apparatus comprising a thermostat and a positioner for establishing the actuation temperature for the thermostat, the thermostat comprising a wax motor comprising a piston, and the positioner comprising an output member having at least two positions, each representing a predetermined actuation temperature for the thermostat and a piston stroke limiter to limit motion of the piston upon motion of the output member beyond one of its two positions to establish one of the predetermined actuation temperatures.
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7. A thermostat apparatus comprising
a thermostat comprising a valve, first piston, and first thermal expansion device cooperatively associated to actuate the valve in response to a valve actuation temperature, and a positioner to relatively move the first piston and first thermal expansion device between a higher valve actuation temperature position establishing a higher valve actuation temperature for actuating the valve and a lower valve actuation temperature position establishing a lower valve actuation temperature for actuating the valve, the positioner comprising a second thermal expansion device and a second piston extensible from the second thermal expansion device in response to temperature and operatively connected to the first piston.
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14. A thermostat apparatus comprising
a thermostat comprising a valve, a first piston, and a first thermal expansion device receiving the first piston and comprising a first expansion agent responsive to a valve actuation temperature to relatively move the first piston and the first thermal expansion device to actuate the valve, and a positioner comprising a second piston, a second thermal expansion device receiving the second piston and comprising a second expansion agent responsive to temperature, and a heater to heat the second expansion agent to extend the second piston from the second thermal expansion device to retract the first piston into the first thermal expansion device from a higher valve actuation temperature position establishing a higher valve actuation temperature for actuating the valve to a lower valve actuation temperature position establishing a lower valve actuation temperature for actuating the valve.
Specification