Control apparatus for multiple unit air conditioning system

Details Control apparatus for multiple unit air conditioning system Control apparatus for multiple unit air conditioning system

1993-04-19

1994-05-10

Ford, John K.

Refrigeration

Automatic control

Time or program actuator

62175, 621964, F25B 700, F25B 4104, G05D 2332

Patent

active

053097289

ABSTRACT:
The operation of indoor devices in a multiple unit air conditioning system are monitored by an operation sensing portion. After all the indoor devices are turned off, the compressor continues to operate for a length of time determined by the time constant delay portion and then is turned off. Once the solenoid valves 4 feeding refrigerant to the indoor heat exchangers 3 are closed, the continued operation of compressor 6 causes an over-pressure relief valve 8 to open. This equalizes the pressure difference between the suction line and the high pressure discharge line of the compressor and thereby allows for faster restarts than a conventional bypass line 9.

REFERENCES:
patent: 2403818 (1946-07-01), McGrath
patent: 3599006 (1971-08-01), Harris
patent: 3777240 (1973-12-01), Neill
patent: 4254633 (1981-03-01), Murakami et al.
patent: 4384462 (1983-05-01), Overman et al.
patent: 4510767 (1985-04-01), Komatsu et al.
patent: 4637220 (1987-01-01), Sakano
patent: 4679404 (1987-07-01), Alsenz

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