Control for a combination furnace and heat pump system
Patent
·
OSTI ID:5318161
A control circuit is described wherein a temperature dependent relay is connected to a thermostat such that the heat pump is operated to supply heat to an enclosure when the outdoor temperature is above a predetermined level and the furnace is operated to supply heat to the enclosure when the outdoor temperature is below a predetermined level. To defrost the outdoor coil of the heat pump the furnace is operated to supply heat to the indoor coil of the heat pump and a reversing valve relay is energized whereby the heat pump is operated in a reverse direction to supply heat to the outdoor coil for defrost.
- Assignee:
- Carrier Corp.
- Patent Number(s):
- US 4178988
- OSTI ID:
- 5318161
- Country of Publication:
- United States
- Language:
- English
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