EP0033781A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Compressor fault detection and control system for a heat pump
Assignee: Honeywell Inc
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Filing: 1980-12-23
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Granted: —
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Expires: 2000-12-23
Abstract
Abstract A compressor fault detection and control system for a reverse cycle refrigeration apparatus in response to the detection of a fault inhibits the compressor and provides a fault indication. It comprises a controller (50) receiving input signals indicative of the outdoor coil temperature, the temperature of the compressor discharge refrigerant. and a signal indicative of a demand from a room temperature sensor (42) for heating or cooling of the room. The controller (50) includes a timer (105) and means (115, 165, 177, 182) for comparing the value of the compressor discharge temperature and the value of the outdoor coil temperature. Further, the controller (50) has an operative connection to control means (15) for the compressor (14) and functioning, after the compressor has been operating for a preselected time interval, to inhibit any further operation of the compressor means unless the value of the compressor discharge temperature is greater than the value of the outdoor coil temperature plus a preselected constant value.
Inventors
- 👤 Dale A. Mueller
- 👤 Stephen L. Serber
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 02:15
CPC Classifications
F; F25; F25B; F25B49/00; F25B49/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
189 words
A compressor fault detection and control system for a reverse cycle refrigeration apparatus for heating and cooling an enclosed space and comprising a refrigerant compresssor (14), compressor control means (5), an indoor coil (10), and outdoor coil (12)and refrigerant conduits (21-26) interconnecting said compressor and said coils, characterized b y a) an outdoor coil temperature sensor (3)having an output (32); b) a compressor temperature sensor (34) having an output (35); c) a controller (50) having inputs connected to said temperature sensors (31,34) and an outputconnec- ted to said compressor control means (15) whereby said compressor is enabled to operate or is inhibited from operating, d) a timer (105) as part of said controller (50); e) a comparator (115) within said controller (50) for comparing the value of the compressor discharge temperature with the value of the outdoor coil temperature plus a preselected constant (K1); f) said controller (50) being adapted to inhibit said compressor (14) from operating if, after a preselected time interval as measured by said timer, the value of the compressor discharge temperature is less than the value of the outdoor coil temperature plus said constant (K1);
Claim 2
Dependent Claim
189 words
A compressor fault detection and control system for a reverse cycle refrigeration apparatus for heating and cooling an enclosed space and comprising a refrigerant compresssor (14), compressor control means (5), an indoor coil (10), and outdoor coil (12)and refrigerant conduits (21-26) interconnecting said compressor and said coils, characterized b y a) an outdoor coil temperature sensor (3)having an output (32); b) a compressor temperature sensor (34) having an output (35); c) a controller (50) having inputs connected to said temperature sensors (31,34) and an outputconnec- ted to said compressor control means (15) whereby said compressor is enabled to operate or is inhibited from operating, d) a timer (105) as part of said controller (50); e) a comparator (115) within said controller (50) for comparing the value of the compressor discharge temperature with the value of the outdoor coil temperature plus a preselected constant (K1); f) said controller (50) being adapted to inhibit said compressor (14) from operating if, after a preselected time interval as measured by said timer, the value of the compressor discharge temperature is less than the value of the outdoor coil temperature plus said constant (K1);
Claim 3
Dependent Claim
93 words
2 . A system according to claim 1, characterized b y g) a room temperature sensor (42) providing at its output (43) a signal indicative of a demand for heating or cooling of the enclosed space; to receive h) the controller (50) having inputs the output signals of said three temperature sensors (31,34,42) and including a switch (46) selectively interconnecting the output (44) of the room temperature sensor (42)to said compressor control means (15) whereby only when said output (44) is connected to the control means (15) the compressor is enabled to operate.
Claim 4
Dependent Claim
93 words
A System according to claim 1 or 2, characterized by said controller (50) including a second comparator (165) effective once a compressor start has been proved and the robm thermostat (42) continues to demand heating or cooling of the enclosed space, said second comparator (165) comparing the values of the compressor discharge temperature and the outdoor coil temperature and being effective to inhibit the operation of said compressor (14)if the value of the compressor discharge temperature is not greater than the value of the outdoor coil temperature plus a preselected constant (K3) .
Claim 5
Independent Claim
100 words
A System according to one of claims 1 to 3, characterized by said controller (50) including a third comparator (177) effective once a compressor start has been proved and the room thermostat ( 4 2) ceases to demand heating or cooling of the enclosed space said third comparator (177) comparing the values of the compressor discharge temperature and the outdoor coil temperature and being effective to inhibit the operation of said compressor (14) if, after a preselected time, the value of the compressor discharge temperature is greater than the value of the outdoor coil temperature plus a preselected constant (K4)
Claim 6
Independent Claim
97 words
A system according to one of claims 1 to 4, characterized by said controller (50)including a fourth comparator (182) effective once a compressor start has been proved and the room thermostat (42) ceases to demand heating or cooling of the enclosed space, the fourth comparator (182) comparing the value of the compressor discharge temperature and the outdoor coil temperature and being effective to inhibit the operation of said compressor (14) if, after a preselected time, the value of the compressor discharge temperature is greater than the value of the outdoor coil temperature plus a preselected constant (K5).
Claim 7
Independent Claim
31 words
A system according to one of claims 1 to 5, characterized in that the controller (50) comprises a microprocessor for performing the comparison and generating the control and fault indicating signals.
Claim 8
Dependent Claim
27 words
A system according to claim 6, characterized in that a Multiplexer (40) and an A/D-converter (54) are inserted between the temperature sensors (31,34) and the controller (50).
References Cited (Backward Citations)
No citation records indexed.
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