GB807812A - Improvements in or relating to the automatic defrosting of refrigeration apparatus - Google Patents
Improvements in or relating to the automatic defrosting of refrigeration apparatusInfo
- Publication number
- GB807812A GB807812A GB771457A GB771457A GB807812A GB 807812 A GB807812 A GB 807812A GB 771457 A GB771457 A GB 771457A GB 771457 A GB771457 A GB 771457A GB 807812 A GB807812 A GB 807812A
- Authority
- GB
- United Kingdom
- Prior art keywords
- motor
- contact
- heater
- compressor
- timer
- 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.)
- Expired
Links
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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/002—Defroster control
- F25D21/008—Defroster control by timer
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Defrosting Systems (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
807,812. Refrigerating. HERON, A. G. March 8, 1957, No. 7714/57. Class 29 Defrosting by an electric heater 15 is initiated by a time switch 10 driven by a high impedance motor 12 operating only during periods of refrigeration and defrosting. The time switch arm 10 is connected to a positive source P. One contact 17 is connected to earth N through a thermostat 18 and the compressor motor 19. The other contact 20 is connected on one side to earth through the high impedance motor 12, the contact of thermostat 18 remote from contact 17 and the compressor motor 19, and on the other side to earth through normally closed thermostats 13, 14, responsive to evaporator temperature and pressure respectively, and the heater 15. The impedances of the heater and compressor motor are small compared with that of the timer motor. During normal refrigeration the switch arm is at contact 17 and the compressor motor is cycled by the thermostat 18. When this is closed current flows through the contact remote from contact 17 through the motor 12 and the heater 15, but owing to the high impedance of the motor the potential drop across the heater is insufficient for it to operate. When switch 18 is open both compressor and timer motors are inoperative. On defrosting the switch arm is at contact 20 and the timer motor and heater are in parallel, while the compressor motor is in series with the timer motor and thus inoperative. A fan 19a is connected in the circuit.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB771457A GB807812A (en) | 1957-03-08 | 1957-03-08 | Improvements in or relating to the automatic defrosting of refrigeration apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB771457A GB807812A (en) | 1957-03-08 | 1957-03-08 | Improvements in or relating to the automatic defrosting of refrigeration apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
GB807812A true GB807812A (en) | 1959-01-21 |
Family
ID=9838344
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB771457A Expired GB807812A (en) | 1957-03-08 | 1957-03-08 | Improvements in or relating to the automatic defrosting of refrigeration apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB807812A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3029611A (en) * | 1959-11-16 | 1962-04-17 | Gen Motors Corp | Refrigerating apparatus with defrosting means |
US3063250A (en) * | 1960-08-19 | 1962-11-13 | Gen Motors Corp | Refrigeration apparatus with defrost control means |
DE1144306B (en) * | 1959-05-02 | 1963-02-28 | Schmitz Kuehler Baierbrunn | Automatic switch for electrical cooling systems |
FR2587098A1 (en) * | 1985-09-12 | 1987-03-13 | Candy Elettrodomestici | REFRIGERATION APPARATUS HAVING AN IMPROVED DEFROST DEVICE |
-
1957
- 1957-03-08 GB GB771457A patent/GB807812A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1144306B (en) * | 1959-05-02 | 1963-02-28 | Schmitz Kuehler Baierbrunn | Automatic switch for electrical cooling systems |
US3029611A (en) * | 1959-11-16 | 1962-04-17 | Gen Motors Corp | Refrigerating apparatus with defrosting means |
US3063250A (en) * | 1960-08-19 | 1962-11-13 | Gen Motors Corp | Refrigeration apparatus with defrost control means |
FR2587098A1 (en) * | 1985-09-12 | 1987-03-13 | Candy Elettrodomestici | REFRIGERATION APPARATUS HAVING AN IMPROVED DEFROST DEVICE |
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