Furnace monitoring and thermostat cycling system for recreational vehicles and marine vessels
First Claim
1. A heating furnace monitoring and thermostat cycling system for the cabin or interior living space of a recreational vehicle, marine vessel or other such mobile self-contained environment, said vehicle having a heating furnace provided with a thermostat circuit and a blower motor, the system comprising, in combination:
- a means for sensing the ambient temperature of said cabin;
a means for detecting a decrease in said ambient temperature;
a means for detecting the operation of said blower motor;
a means for cycling open and then closed said thermostat circuit of said heating furnace when said decrease in ambient temperature and said operation of the furnace blower motor are detected simultaneously;
a means for disabling furnace operation after a countably finite number of said cycling actions.
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0 Petitions
Accused Products
Abstract
Recreational vehicles and marine vessels provide for cabin environment heating by a thermostatically controlled furnace which is typically fueled by a portable supply of liquefied petroleum gas and electrically powered by an on board battery. The invention detects and corrects for the situation where the furnace does not light by cycling the thermostat to allow the furnace to relight. The device will allow for three trials before the thermostat is locked out in an off position to prevent the furnace from blowing cold air and draining the battery system. The device provides for centrally located indication of the current temperature and a resettable display of the furnace retrial and lockout condition status, as well as the gas pressure as delivered to the furnace.
68 Citations
8 Claims
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1. A heating furnace monitoring and thermostat cycling system for the cabin or interior living space of a recreational vehicle, marine vessel or other such mobile self-contained environment, said vehicle having a heating furnace provided with a thermostat circuit and a blower motor, the system comprising, in combination:
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a means for sensing the ambient temperature of said cabin; a means for detecting a decrease in said ambient temperature; a means for detecting the operation of said blower motor; a means for cycling open and then closed said thermostat circuit of said heating furnace when said decrease in ambient temperature and said operation of the furnace blower motor are detected simultaneously; a means for disabling furnace operation after a countably finite number of said cycling actions. - View Dependent Claims (2)
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3. A heating furnace monitoring and thermostat cycling system for the cabin or interior living space of a recreational vehicle, marine vessel or other such mobile self-contained environment, said vehicle having a heating furnace provided with a thermostat circuit and a blower motor, the system comprising, in combination:
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a means for generating a first signal responsive to the ambient temperature in said cabin; a means for generating a second signal responsive to the polarity of the differential with respect to time of said temperature; a means for generating a third signal when said second signal is of a polarity indicative of decreasing temperature; a means for generating a fourth signal responsive to the flow of electrical current to said blower motor; a means for generating a fifth signal when said third and fourth signals are generated simultaneously; a means for effecting an electrically open circuit of infinite resistance and subsequently an electrically closed circuit of zero resistance in the thermostat circuit of said heating furnace in response to the generation of said fifth signal; a means for counting the number of said responses; a means for storing a maximum reference value; a means a generating a sixth signal when said cumulative number exceeds said stored maximum reference value; a means for effecting an electrically open circuit of infinite resistance in said thermostat circuit in response to said generation of said sixth signal. - View Dependent Claims (4, 5, 6, 7, 8)
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Specification