Cool/heat pump control circuit for a room air conditioner
US5421399A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 7, 1994 |
| Grant date | Jun 6, 1995 |
| Priority date | — |
| Expiry date | Jan 7, 2014 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF24F2203/02
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A control circuit for a cool/heat pump in which two separate motors are utilized, each with a main winding and an auxiliary winding. A single dual rated capacitor is provided in series with both auxiliary windings. A selectively operative switch, which may be in the form of a thermostat, is provided in series between one of the alternating current lines and the windings of one of the motors to selectively terminate power to that motor while maintaining power to both windings of the other motor. The switch is also used to alternately energize an electric heater unit when the motor power is terminated. Such a control circuit avoids a de-icing operation normally required with cool/heat pumps working in a heating mode, when the outdoor temperature is below freezing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.