HVAC system remote monitoring and diagnosis

Patent metadata

Field	Value
Publication number	US-9551504-B2
Application number	US-201414209415-A
Country	US
Kind code	B2
Filing date	Mar 13, 2014
Priority date	Mar 15, 2013
Publication date	Jan 24, 2017
Grant date	Jan 24, 2017

Abstract

An apparatus for monitoring a heating, ventilation, or air conditioning (HVAC) system includes an indoor unit monitor module electrically connected to a current sensor and first and second refrigerant temperature sensors. The current sensor generates a first current signal based on aggregate current consumed by components of an indoor unit of the HVAC system. The refrigerant temperature sensors generate first and second refrigerant temperature signals, respectively, based on measured temperatures of refrigerant circulating within the HVAC system. The indoor unit monitor module receives, from a secondary monitoring module, a second current signal based on aggregate current consumed by components of an outdoor unit of the HVAC system. The indoor unit monitor module transmits data to a remote server to assess whether a failure has occurred or is likely to occur in the components of the HVAC system. The data is based on the current signals and the refrigerant temperature signals.

First claim

What is claimed is:

1. An apparatus for monitoring a heating, ventilation, or air conditioning (HVAC) system, the apparatus comprising:
a current sensor configured to generate a first current signal based on aggregate current consumed by components of an indoor unit of the HVAC system;
a first refrigerant temperature sensor configured to generate a first refrigerant temperature signal based on a measured temperature of refrigerant circulating within the HVAC system;
a second refrigerant temperature sensor configured to generate a second refrigerant temperature signal based on a measured temperature of refrigerant circulating within the HVAC system; and
an indoor unit monitor module electrically connected to the current sensor, the first refrigerant temperature sensor, and the second refrigerant temperature sensor,
wherein the indoor unit monitor module is configured to receive a second current signal from a secondary monitoring module,
wherein the second current signal is based on aggregate current consumed by components of an outdoor unit of the HVAC system,
wherein the indoor unit monitor module is configured to transmit data to a remote monitoring server to assess whether a failure has occurred or is likely to occur in the components of the indoor unit of the HVAC system or the components of the outdoor unit of the HVAC system, and
wherein the data is based on the first current signal, the second current signal, the first refrigerant temperature signal, and the second refrigerant temperature signal.

2. The apparatus of claim 1 , wherein the data is exclusive of other refrigerant temperatures.

3. The apparatus of claim 1 , wherein the indoor unit monitor module is configured to receive no other measured information from the secondary monitoring module other than the second current signal.

4. The apparatus of claim 1 , wherein:
the indoor unit monitor module is configured to receive information about a status of one or more control lines from the secondary monitoring module, and
the indoor unit monitor module is configured to receive no other measured information from the secondary monitoring module other than the second current signal and the status.

5. The apparatus of claim 1 , wherein the indoor unit monitor module is configured to communicate with the secondary monitoring module over one or more control lines that control the outdoor unit.

6. The apparatus of claim 1 , further comprising a first air temperature sensor configured to generate a first air temperature signal based on a measured temperature of air flowing through a blower of the HVAC system, wherein the data is further based on the first air temperature signal.

7. The apparatus of claim 6 , wherein:
the first air temperature sensor measures temperature of the air prior to arriving at the blower,
the apparatus further comprises a second air temperature sensor configured to generate a second air temperature signal based on a measured temperature of air having left the blower, and
the data is further based on the second air temperature signal.

8. The apparatus of claim 7 , wherein the data is exclusive of other air temperatures.

9. The apparatus of claim 1 , further comprising a transformer configured to provide power to the indoor unit monitor module, wherein the indoor unit monitor module is configured to measure a voltage of the power, and wherein the data is further based on the voltage.

10. The apparatus of claim 1 , wherein the indoor unit monitor module is configured to receive a status signal from a condensate sensor.

11. The apparatus of claim 1 , wherein the first refrigerant temperature sensor is configured to generate the first refrigerant temperature signal based on the measured temperature of refrigerant output from a condenser of the HVAC system.

12. The apparatus of claim 11 , wherein the first refrigerant temperature sensor is configured to generate the first refrigerant temperature signal based on the measured temperature of refrigerant prior to reaching an expansion device.

13. The apparatus of claim 1 , wherein the second refrigerant temperature sensor is configured to generate the second refrigerant temperature signal based on the measured temperature of refrigerant flowing to a compressor of the HVAC system.

14. A method for monitoring a heating, ventilation, or air conditioning (HVAC) system, the method comprising:
generating a first current signal based on aggregate current consumed by components of an indoor unit of the HVAC system;
generating a first refrigerant temperature signal based on a measured temperature of refrigerant circulating within the HVAC system;
generating a second refrigerant temperature signal based on a measured temperature of refrigerant circulating within the HVAC system;
receiving the first refrigerant temperature signal and the second refrigerant temperature signal directly at an indoor unit monitor module;
receiving, at the indoor unit monitor module, a second current signal from a secondary monitoring module, wherein the second current signal is based on aggregate current consumed by components of an outdoor unit of the HVAC system; and
transmitting data to a remote monitoring server to assess whether a failure has occurred or is likely to occur in the components of the indoor unit of the HVAC system or the components of the outdoor unit of the HVAC system, wherein the data is based on the first current signal, the second current signal, the first refrigerant temperature signal, and the second refrigerant temperature signal.

15. The method of claim 14 , wherein the data is exclusive of other refrigerant temperatures.

16. The method of claim 14 , wherein no other measured information is received from the secondary monitoring module other than the second current signal.

17. The method of claim 14 , further comprising receiving information about a status of one or more control lines from the secondary monitoring module, wherein no other measured information is received from the secondary monitoring module other than the second current signal and the status.

18. The method of claim 14 , further comprising receiving the second current signal from the secondary monitoring module over one or more control lines that control the outdoor unit.

19. The method of claim 14 , further comprising generating a first air temperature signal based on a measured temperature of air flowing through a blower of the HVAC system, wherein the data is further based on the first air temperature signal.

20. The method of claim 19 , wherein:
the first air temperature sensor measures temperature of the air prior to arriving at the blower,
the method further comprises generating a second air temperature signal based on a measured temperature of air having left the blower, and
the data is further based on the second air temperature signal.

21. The method of claim 20 , wherein the data is exclusive of other air temperatures.

22. The method of claim 14 , further comprising measuring a voltage of power provided by a transformer to the indoor unit monitor module, wherein the data is further based on the voltage.

23. The method of claim 14 , further comprising receiving a status signal from a condensate sensor.

24. The method of claim 14 , wherein the first refrigerant temperature signal is based on the measured temperature of refrigerant output from a condenser of the HVAC system.

25. The method of claim 24 , where

Assignees

• Emerson Electric Co

Inventors

• Arensmeier Jeffrey N
• Hemmelgarn Gregg M
• Alsaleem Fadi M
• Abiprojo Priotomo

Classifications

• F24F11/36

  to leakage of heat-exchange fluid · CPC title

• F24F2140/00

  Control inputs relating to system states · CPC title

• F24F11/77

  by controlling the speed of ventilators · CPC title

• F24F11/64

  using pre-stored data · CPC title

• F24F11/58

  using Internet communication · CPC title