EP 0031945 A3 19820519 - HEAT PUMP DEFROST CONTROL
Title (en)
HEAT PUMP DEFROST CONTROL
Publication
Application
Priority
US 10974380 A 19800104
Abstract (en)
[origin: EP0031945A2] An outdoor coil defrost control system for a reverse cycle refrigeration apparatus or heat pump comprises an outdoor air temperature sensor (30), a compressor operation signal generator (42) and a variable frequency oscillator (80) receiving the input signal indicative of the outdoor air temperature and generating an output signal the frequency of which varies as a non-linear function of the magnitude of the outdoor air temperature. A counter (C1 to CN) receives the output signal of the variable frequency oscillator. The refrigeration apparatus is placed into an outdoor coil defrost mode of operation upon the counter counting a preselected number of pulses
IPC 1-7
IPC 8 full level
F24F 11/02 (2006.01); F25B 47/02 (2006.01); F25D 21/00 (2006.01)
CPC (source: EP)
F25B 47/025 (2013.01); F25D 21/006 (2013.01)
Citation (search report)
- US 3466888 A 19690916 - KYLE WILLIAM K
- US 3894404 A 19750715 - STANTON DAVID J
- FR 2367997 A1 19780512 - BORG WARNER [US]
- US 4209994 A 19800701 - MUELLER DALE A [US], et al
- US 4132085 A 19790102 - MAIO KENJI, et al
Designated contracting state (EPC)
CH DE FR GB
DOCDB simple family (publication)
EP 0031945 A2 19810715; EP 0031945 A3 19820519; JP S56102638 A 19810817
DOCDB simple family (application)
EP 80108162 A 19801223; JP 26581 A 19810105