Variable output heating and cooling control
First Claim
1. A controller for a fluid conditioning system for the regulation of temperature in conjunction with a thermostat with outputs of ON and OFF signals;
- comprising;
the controller having a variable output control algorithm which maintains temperature control by operating the fluid conditioning system at a first conditioning rate when the thermostat signal is ON and there is a call for fluid conditioning, and operating the fluid conditioning system at a second conditioning rate, above zero, when the thermostat signal is OFF and there is no call for fluid conditioning.
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Accused Products
Abstract
A heating or cooling system, such as an HVAC system, of variable output has a number of control elements and may include a variable speed compressor, a variable speed combustion (induced or forced draft) blower motor; a variable speed circulator blower motor; a variable output gas valve or gas/air premix unit; and a controller specifically developed for variable output applications. The system may utilize a pressure sensor to determine the actual flow of combustion airflow in response to actual space conditions, vary the speed of the inducer blower, and subsequently vary the gas valve output to supply the correct amount of gas to the burner system. A temperature sensor may be located in the discharge air stream of the conditioned air to provide an input signal for the circulator blower.
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Citations
32 Claims
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1. A controller for a fluid conditioning system for the regulation of temperature in conjunction with a thermostat with outputs of ON and OFF signals;
- comprising;
the controller having a variable output control algorithm which maintains temperature control by operating the fluid conditioning system at a first conditioning rate when the thermostat signal is ON and there is a call for fluid conditioning, and operating the fluid conditioning system at a second conditioning rate, above zero, when the thermostat signal is OFF and there is no call for fluid conditioning. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- comprising;
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13. A variable output heating system comprising:
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a) a variable speed blower providing air for combustion; b) a variable fuel supply valve; c) a thermostat having output of ON and OFF signals; d) a controller having output to control at least the variable elements of (a) and (b) above, the controller including at least; i) a control algorithm for determining a desired firing rate, ii) a lookup table or equation accessible to determine the variable speed of the combustion blower for the desired firing rate, iii) a means of adjusting the variable speed combustion air blower speed in order to achieve the desired quantity of combustion air for a desired firing rate in (i) above, and iv) the control algorithm using the output ON and output OFF signal from the thermostat whereby the system operates at a first firing rate when the thermostat signal is ON, and there is a call for heat, and will operate at a second firing rate above zero when the thermostat signal is OFF, and there is no call for heat, to maintain temperature control. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A variable output cooling system comprising:
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a) a variable output refrigerant compressor; b) a variable speed transfer blower situated so as to transfer heat from the outdoor coil to the surrounding air; c) a variable indoor circulating blower; d) a thermostat with an ON signal and OFF signal; e) a controller having output for at least the variable elements of (a), (b), and (c) above, the controller including; i. a control algorithm for determining a desired variable refrigerant compressor output, ii. means for determining a desired speed of the variable speed transfer blower, iii. means for determining a desired speed of the variable indoor circulating blower, iv. the control algorithm using the output ON and output OFF signal from the thermostat whereby the system operates at a first cooling rate when the thermostat signal is ON, and there is a call for heat, and will operate at a second cooling rate above zero when the thermostat signal is OFF, and there is no call for heat, to maintain temperature control. - View Dependent Claims (25, 26, 27, 28, 29)
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- 30. A controller for a variable output fluid conditioning system having an algorithm for determining a fluid conditioning rate based on a thermostat ON/OFF history to establish a minimum ON time for at least a portion of the fluid conditioning system.
Specification