US20090120111A1 - Remote Diagnostics and Prognostics for Refrigerant Systems - Google Patents

Remote Diagnostics and Prognostics for Refrigerant Systems Download PDF

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Publication number
US20090120111A1
US20090120111A1 US12/083,790 US8379008A US2009120111A1 US 20090120111 A1 US20090120111 A1 US 20090120111A1 US 8379008 A US8379008 A US 8379008A US 2009120111 A1 US2009120111 A1 US 2009120111A1
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US
United States
Prior art keywords
components
refrigerant system
controller
operational parameters
transducer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US12/083,790
Other languages
English (en)
Inventor
Michael F. Taras
Alexander Lifson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Carrier Corp
Original Assignee
Carrier Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Carrier Corp filed Critical Carrier Corp
Assigned to CARRIER CORPORATION reassignment CARRIER CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LIFSON, ALEXANDER, TARAS, MICHAEL F.
Publication of US20090120111A1 publication Critical patent/US20090120111A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/005—Arrangement or mounting of control or safety devices of safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/11—Fan speed control
    • F25B2600/111—Fan speed control of condenser fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/11—Fan speed control
    • F25B2600/112—Fan speed control of evaporator fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1931—Discharge pressures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1933—Suction pressures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21151—Temperatures of a compressor or the drive means therefor at the suction side of the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • the present invention relates to diagnostic systems and methods, and more particularly, to diagnostic systems and methods in refrigerant systems established via a remote connection.
  • a refrigerant system including a plurality of components for regulating operational parameters of the refrigerant system, at least one transducer connected to the refrigerant system for monitoring the operational parameters of the refrigerant system, and a controller.
  • the controller is remotely connected to the at least one transducer and to at least one component of the plurality of components, for at least periodically receiving operational parameter information from the at least one transducer to monitor the operational parameters and determine, based on variations in at least one parameter of the operational parameters, whether a condition exists in the refrigerant system that requires corrective action.
  • the controller is remotely connected to the at least one transducer and at least one component of the refrigerant system via a local system controller.
  • the controller controls said local system controller to monitor and operate the refrigerant system.
  • the method includes detecting operational parameters of the refrigerant system at least periodically, and during an operation of the refrigerant system, via at least one transducer connected to the refrigerant system.
  • the method further includes receiving parameter information from the at least one transducer to monitor the operational parameters via a controller remotely connected to the at least one transducer and at least one component of a plurality of components.
  • the method also includes determining, based on variations in at least one parameter of the operational parameters, whether a condition exists in the refrigerant system that requires corrective action.
  • FIG. 1 shows a refrigerant system including a monitoring system according to the present invention.
  • FIG. 1 shows a refrigerant system 100 including a monitoring system 105 according to the present invention.
  • Refrigerant system 100 includes refrigerant lines 110 , and a plurality of components for regulating operational parameters of refrigerant system 100 , including condenser and evaporator heat exchangers 115 associated with corresponding outdoor and indoor fans 145 , expansion device 120 , compressor 125 , and discharge, suction and bypass flow control devices such as valves 140 .
  • the schematic presented in FIG. 1 is purely exemplary; there are many possible configurations and variations of the design of refrigerant system 100 that are not shown but fall within the scope of the invention.
  • Monitoring system 105 includes a remote controller 150 , connected to refrigerant system 100 .
  • Controller 150 is connected to transducers 135 and to at least one of the plurality of components including fans 145 , expansion device, e.g., valve 120 , compressor 125 , and valves 140 .
  • Transducers 135 may be temperature or pressure transducers, and are connected to refrigerant system 100 at various location points, for example, at lines 110 for simplicity of installation.
  • remote controller 150 is indirectly connected to refrigerant system 100 via an optional local system controller 130 , which is directly connected to transducers 135 and to at least one of the plurality of components.
  • remote controller 150 is connected to transducers 135 , for monitoring refrigerant system 100 , and to at least compressor 125 and/or valves 140 .
  • Remote controller 150 receives signals from transducers 135 , translates the signals into parameter information, and controls components of refrigerant system 100 and monitoring system 105 , such as transducers 135 , compressor 125 and valves 140 .
  • Remote controller 150 may also provide information to a user regarding observed parameters and the status of various components.
  • Remote controller 150 preferably includes a computing platform, such as a personal computer, a mainframe computer, or any other type of computing platform that may be provisioned with a memory device (not shown), a CPU or microprocessor device (not shown), and several I/O ports (not shown). Remote controller 150 may also include a display or other device for providing information, a visual or audio indicator to identify a malfunctioning component. Remote controller 150 may also include an interface allowing a user to set operating parameters and control components of refrigerant system 100 and/or monitoring system 105 .
  • a computing platform such as a personal computer, a mainframe computer, or any other type of computing platform that may be provisioned with a memory device (not shown), a CPU or microprocessor device (not shown), and several I/O ports (not shown). Remote controller 150 may also include a display or other device for providing information, a visual or audio indicator to identify a malfunctioning component. Remote controller 150 may also include an interface allowing a user to set operating parameters and control components of refrigerant system 100
  • Remote controller 150 is remotely connected to refrigerant system 100 .
  • remote controller 150 is connected to transducers 135 , compressor 125 , and/or other components of refrigerant system 100 .
  • Controller may be directly connected to refrigerant system 100 over a remote connection or a network, such as the Internet, an intranet, or a local area network.
  • remote controller 150 is remotely connected to refrigerant system 100 via local system controller 130 , which is directly connected to transducers 135 and other components of refrigerant system 100 .
  • local system controller 130 is directly connected to transducers 135 , compressor 125 , and/or other components of refrigerant system 100 .
  • Local system controller 130 may be hard wired to the system components.
  • Remote controller 150 is connected to local system controller 130 over a remote connection or a network, such as the Internet, an Intranet, or a local area network. In this embodiment, remote controller 150 operates local system controller 130 to monitor and control refrigerant system 100 .
  • Remote controller 150 collects and processes operational parameter information of refrigerant system 100 in real time, preferably during normal operation of refrigerant system 100 , for diagnosis and/or prognosis of potentially malfunctioning or degrading components of refrigerant system 100 .
  • Remote controller 150 collects parameter information by receiving signals from at least one of transducers 135 , to monitor said operational parameters, and determines whether a condition exists in said refrigerant system that requires corrective action.
  • remote controller 150 receives parameter information form transducers 135 via local system controller 130 .
  • Remote controller 150 determines whether a condition requiring corrective action exists based on variations in at least one parameter of said operational parameters.
  • Remote controller 150 collects parameter information periodically or when problems arise. Remote controller 150 may also collect parameter information from transducers 135 continuously during operation of refrigerant system 100 .
  • Remote controller 150 performs a diagnostic function by determining whether a condition exists that requires corrective action. In one embodiment, remote controller 150 displays parameter information to a user, who then determines whether a condition requiring corrective action exists. Such a condition may be a potential malfunction of one or more of the components, such as valves 140 , and/or a degradation of the operation of refrigerant system 100 caused by one or more of said components.
  • Remote controller 150 may determine whether a component is malfunctioning, or potentially malfunctioning, by remotely switching at least one of the components from a first operating state to a second operating state, observing a variation in an operational parameter resulting from the switching, comparing the observed variation with an expected variation due to the switching, and detecting a difference or a substantial difference between the observed variation and the expected variation.
  • a tolerance value, or minimum difference between the observed variation and the expected variation can be set, so that any difference greater than the tolerance value will trigger a malfunction determination.
  • remote controller 150 switches valves such as valves 120 and 140 between operating positions, such as “on”, i.e., open, or “off”, i.e., closed.
  • the operating position of valves 120 and 140 may also be an intermediate position between “on” and “off” positions.
  • a first operating state is a first position of valves 120 and 140
  • a second operating state is a second position of valves 120 and 140 .
  • valves 120 and 140 can be tested by moving them from a first operating state to a second operating state for a short period of time during startup, shutdown or continuous operation and monitoring the change in the corresponding operational parameters.
  • Remote controller 150 may detect a degradation of operation of refrigerant system 100 by remotely observing a change in related operational parameters over a period of time.
  • components that could cause degradation include air filters, which can become dirty or clogged, and condenser/evaporator coils 115 , which can become clogged, rusted or accidentally blocked.
  • the system is a prognostic system, because although there is no actual malfunction, the degradation in operational parameters indicates that a problem is developing. The system can then generate a response to address such a developing problem before it detrimentally affects reliability of refrigerant system 100 or significantly affects its operation. For instance, refrigerant system 100 may be moved by remote controller 150 to a lighter (less loaded) mode of operation to prevent component breakdown or failure.
  • prognostic methodology can be employed. Degradation of operational parameters can be monitored over a period of time, so that predictions can be made with high confidence as to when preventive maintenance must be performed for a particular system installation.
  • remote controller 150 may generate a response.
  • the response may include generating a warning signal indicating that the condition exists.
  • the warning signal may be displayed to an end user.
  • the response may also include generating a repair or maintenance request, which can be relayed to a repair center or other location by which a repair technician is alerted.
  • the signal and the repair or maintenance request include an identification of one or more of the components that are causing said condition.
  • the response includes remotely controlling at least one of the components to alter the operational parameters to remedy the condition and/or avoid further damage to refrigerant system 100 .
  • remote controller 150 can control at least one of the components to operate refrigerant system 100 in a light mode, i.e., a lighter or less loaded mode of operation, while providing continuous monitoring of its operation. In this instance, remote controller 150 performs sequential unloading steps. For example, if a potential problem is associated with compressor 125 , then remote controller 150 can run refrigerant system 100 in the bypass mode or at reduced speed. In another example, if the problem is associated with one of fans 145 , remote controller 150 can reduce the speed of one or more of the fans 145 .
  • remote controller 150 can shut down one or more of the components and/or shut down refrigerant system 100 completely. Shutting down refrigerant system 100 completely should be a last resort and when all other possible measures are exhausted.
  • the method for monitoring a refrigerant system includes detecting operational parameters of refrigerant system 100 at least periodically and during an operation of refrigerant system 100 , receiving parameter information from at least one transducer 135 via remote controller 150 , and determining, based on variations in at least one operational parameter, whether a condition exists in refrigerant system 100 that requires corrective action.
  • the operational parameters are continuously detected and parameter information is continuously received.
  • the step of determining whether the potential malfunction, i.e., condition requiring corrective action, exists includes switching at least one component of the plurality of components from a first operating state to a second operating state, observing a variation in an operational parameter resulting from the switching, comparing the observed variation with an expected variation due to the switching, and detecting a substantial difference between the observed variation and the expected variation.
  • the step of determining whether the degradation exists includes detecting degradation in the operational parameters over a period of time.
  • the method includes generating a response if the condition exists.
  • the response may include generating a signal indicating that the condition exists, generating a repair or maintenance request, and/or remotely controlling at least one of the plurality of components to alter operational parameters to remedy the condition and/or avoid further damage to refrigerant system 100 .
  • the signal and the repair or maintenance request include an identification of one or more of the plurality of components that are causing the condition.
  • controlling at least one of the plurality of components includes operating refrigerant system 100 in a light mode (e.g., unloaded mode), shutting down one or more of the plurality of components, and/or shutting down refrigerant system 100 .
  • a light mode e.g., unloaded mode
  • the system and method of the present invention will significantly reduce the expense of troubleshooting and maintenance as well as refrigerant system downtime and customer discomfort.
  • the system and method has an additional advantage in that it requires only control logic modifications and requires no hardware change or addition.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)
  • Testing And Monitoring For Control Systems (AREA)
US12/083,790 2005-10-18 2005-10-18 Remote Diagnostics and Prognostics for Refrigerant Systems Abandoned US20090120111A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2005/037336 WO2007046791A1 (en) 2005-10-18 2005-10-18 Remote diagnostics and prognostics for refrigerant systems

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US20090120111A1 true US20090120111A1 (en) 2009-05-14

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US (1) US20090120111A1 (de)
EP (1) EP1946021A4 (de)
CN (1) CN101326415B (de)
HK (1) HK1127516A1 (de)
WO (1) WO2007046791A1 (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100204838A1 (en) * 2009-02-12 2010-08-12 Liebert Corporation Energy efficient air conditioning system and method utilizing variable capacity compressor and sensible heat ratio load matching
US20100281894A1 (en) * 2008-01-17 2010-11-11 Carrier Corporation Capacity modulation of refrigerant vapor compression system
US9175872B2 (en) 2011-10-06 2015-11-03 Lennox Industries Inc. ERV global pressure demand control ventilation mode
US9395097B2 (en) 2011-10-17 2016-07-19 Lennox Industries Inc. Layout for an energy recovery ventilator system
US9404668B2 (en) 2011-10-06 2016-08-02 Lennox Industries Inc. Detecting and correcting enthalpy wheel failure modes
US9441843B2 (en) 2011-10-17 2016-09-13 Lennox Industries Inc. Transition module for an energy recovery ventilator unit
US9671122B2 (en) 2011-12-14 2017-06-06 Lennox Industries Inc. Controller employing feedback data for a multi-strike method of operating an HVAC system and monitoring components thereof and an HVAC system employing the controller
US9835353B2 (en) 2011-10-17 2017-12-05 Lennox Industries Inc. Energy recovery ventilator unit with offset and overlapping enthalpy wheels
US20180135902A1 (en) * 2016-11-15 2018-05-17 Fuji Electric Co., Ltd. Refrigerant circuit device
US9977409B2 (en) 2011-03-02 2018-05-22 Carrier Corporation SPC fault detection and diagnostics algorithm
WO2023220788A1 (en) * 2022-05-20 2023-11-23 Hussmann Australia Pty Ltd Refrigeration network monitoring system and device

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US20010003906A1 (en) * 1999-12-15 2001-06-21 Roh Young Hoon Air conditioner for multiple room
US20010048376A1 (en) * 2000-03-29 2001-12-06 Tsutomu Maeda Remote monitoring system for air conditioners
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US6535123B2 (en) * 1999-01-09 2003-03-18 Heat - Timer Corporation Electronic message delivery system
US6647317B2 (en) * 2000-09-06 2003-11-11 Hitachi Ltd Air conditioner management system
US20050086951A1 (en) * 2003-10-28 2005-04-28 Dobmeier Thomas J. Expansion device with low refrigerant charge monitoring
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US20050204758A1 (en) * 2004-03-22 2005-09-22 Lg Electronics Inc. Central control system for multi-type air conditioners and operating method thereof
US6955302B2 (en) * 2003-11-13 2005-10-18 York International Corporation Remote monitoring diagnostics
US20050235660A1 (en) * 2004-04-27 2005-10-27 Pham Hung M Compressor diagnostic and protection system

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US6385510B1 (en) * 1997-12-03 2002-05-07 Klaus D. Hoog HVAC remote monitoring system
US6535123B2 (en) * 1999-01-09 2003-03-18 Heat - Timer Corporation Electronic message delivery system
US20010003906A1 (en) * 1999-12-15 2001-06-21 Roh Young Hoon Air conditioner for multiple room
US20010048376A1 (en) * 2000-03-29 2001-12-06 Tsutomu Maeda Remote monitoring system for air conditioners
US6647317B2 (en) * 2000-09-06 2003-11-11 Hitachi Ltd Air conditioner management system
US6892546B2 (en) * 2001-05-03 2005-05-17 Emerson Retail Services, Inc. System for remote refrigeration monitoring and diagnostics
US20050086951A1 (en) * 2003-10-28 2005-04-28 Dobmeier Thomas J. Expansion device with low refrigerant charge monitoring
US6964173B2 (en) * 2003-10-28 2005-11-15 Carrier Corporation Expansion device with low refrigerant charge monitoring
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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100281894A1 (en) * 2008-01-17 2010-11-11 Carrier Corporation Capacity modulation of refrigerant vapor compression system
US20100204838A1 (en) * 2009-02-12 2010-08-12 Liebert Corporation Energy efficient air conditioning system and method utilizing variable capacity compressor and sensible heat ratio load matching
US9977409B2 (en) 2011-03-02 2018-05-22 Carrier Corporation SPC fault detection and diagnostics algorithm
US9175872B2 (en) 2011-10-06 2015-11-03 Lennox Industries Inc. ERV global pressure demand control ventilation mode
US9404668B2 (en) 2011-10-06 2016-08-02 Lennox Industries Inc. Detecting and correcting enthalpy wheel failure modes
US10823447B2 (en) 2011-10-06 2020-11-03 Lennox Industries Inc. System and method for controlling a blower of an energy recovery ventilator in response to internal air pressure
US10197344B2 (en) 2011-10-06 2019-02-05 Lennox Industries Inc. Detecting and correcting enthalpy wheel failure modes
US9395097B2 (en) 2011-10-17 2016-07-19 Lennox Industries Inc. Layout for an energy recovery ventilator system
US9835353B2 (en) 2011-10-17 2017-12-05 Lennox Industries Inc. Energy recovery ventilator unit with offset and overlapping enthalpy wheels
US10337759B2 (en) 2011-10-17 2019-07-02 Lennox Industries, Inc. Transition module for an energy recovery ventilator unit
US9441843B2 (en) 2011-10-17 2016-09-13 Lennox Industries Inc. Transition module for an energy recovery ventilator unit
US9671122B2 (en) 2011-12-14 2017-06-06 Lennox Industries Inc. Controller employing feedback data for a multi-strike method of operating an HVAC system and monitoring components thereof and an HVAC system employing the controller
US20180135902A1 (en) * 2016-11-15 2018-05-17 Fuji Electric Co., Ltd. Refrigerant circuit device
WO2023220788A1 (en) * 2022-05-20 2023-11-23 Hussmann Australia Pty Ltd Refrigeration network monitoring system and device

Also Published As

Publication number Publication date
EP1946021A4 (de) 2012-07-11
CN101326415B (zh) 2010-06-16
HK1127516A1 (en) 2009-09-25
CN101326415A (zh) 2008-12-17
EP1946021A1 (de) 2008-07-23
WO2007046791A1 (en) 2007-04-26

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Owner name: CARRIER CORPORATION, CONNECTICUT

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Effective date: 20050804

STCB Information on status: application discontinuation

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