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US 10,365,009 B2Granted
Systems and methods to detect heater malfunction and prevent dry burning
AssigneesTrane International Inc., Trane Air Conditioning Systems (China) Co., Ltd.
InventorsNipeng Cong, Hua Zhao, Ping Yuan
Life of this patent
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Abstract
A heater, e.g. an anti-freezing heater, is disclosed. The heater can be configured to set off an alarm when a heating element is broken or malfunctioning. The heater can also be configured to connect the heating element to a relatively low voltage when the heating element may experience a dry burning condition.
Claims13
An HVAC system, comprising:
- an evaporator;
- and
- a heater configured to provide heat to the evaporator,
- wherein the heater includes a circuit, the circuit is configured to prevent a dry burning condition, the circuit includes:
- a heating element disposed inside a component of the evaporator;
- a power supply including a high voltage power and a low voltage power;
- and
- a voltage selector configured to select the high voltage power or the low voltage power to the heating element,
- wherein the voltage selector is configured to select the high voltage power or the low voltage power based on a temperature of the heating element,
- wherein when the temperature of the heating element exceeds a first predetermined threshold, the voltage selector selects the low voltage power,
- wherein when the temperature of the heating element is below a second predetermined threshold, the voltage selector selects the high voltage power, and
- wherein the first predetermined threshold is greater than the second predetermined threshold.
9 more elements
Dependencies are inferred from the claim text.