EP 0031945 A2 19810715 - Heat pump defrost control.
Title (en)
Heat pump defrost control.
Title (de)
Entfrostungssteuervorrichtung für Wärmepumpen.
Title (fr)
Commande de dégivrage pour pompes de chaleur.
Publication
Application
Priority
US 10974380 A 19800104
Abstract (en)
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)
Designated contracting state (EPC)
CH DE FR GB LI
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