Gregory P Herroon

56303254, May 20, 1997

Jun 1, 1995

8/456960

Vijay Bahel - Sidney OH
Hank Millet - Piqua OH
Mickey Hickey - Sidney OH
Hung Pham - Dayton OH
Gregory P. Herroon - Piqua OH
Wayne R. Warner - Piqua OH
Jean-Luc M. Caillat - Dayton OH

Copeland Corporation - Sidney OH

F25B 4104

62222

The microprocessor-based HVAC control system detects sensor faults by comparing thermistor readings with predetermined extreme values, indicative of sensor fault. The system automatically selects the appropriate combination of automatic/preset modes of operating key system components such as the expansion valve, the demand defrost system and the indoor fan speed control system. With a view towards minimizing any negative impact on system performance and reliability in the event of sensor malfunction.

55333524, Jul 9, 1996

Sep 2, 1994

8/300799

Vijay O. Bahel - Sidney OH
Hank E. Millet - Piqua OH
Mickey F. Hickey - Sidney OH
Hung M. Pham - Dayton OH
Gregory P. Herroon - Piqua OH
Gerald L. Greschl - Dayton OH
Joseph B. Niemann - Troy OH

Copeland Corporation - Sidney OH

F25D 1706

62180

Liquid refrigerant temperature, measured by a sensor adjacent the flow control device, provides multiple diverse pieces of information which are used to control the indoor fan speed. liquid refrigerant temperature is used as an indication of outdoor air temperature and is also used as an indication of whether the compressor is operational or not.

54408903, Aug 15, 1995

Dec 10, 1993

8/165725

Vijay Bahel - Sidney OH
Hank Millet - Piqua OH
Mickey Hickey - Sidney OH
Hung Pham - Dayton OH
Gregory P. Herroon - Piqua OH

Copeland Corporation - Sidney OH

F25B 4100
F25B 4702
F25D 2106
G01N 2500

62 81

A blocked fan or obstructed airflow condition is detected by measuring the difference between outdoor air temperature and outdoor exchanger coil temperature. If a very high difference is detected, or if no decrease in the difference is achieved after termination of the defrost cycle, and if either of these conditions persists over a plurality of defrost cycles, then the blocked condition is declared. The diagnostic system can be integrated in an existing demand defrost cycle and is capable of detecting blocked conditions attributable to foreign matter such as leaves, paper and debris which cannot be cleared by defrosting.

56238347, Apr 29, 1997

May 3, 1995

8/433619

Vijay Bahel - Sidney OH
Hank Millet - Piqua OH
Mickey Hickey - Sidney OH
Hung Pham - Dayton OH
Gregory P. Herroon - Piqua OH
Gerald L. Greschl - Dayton OH

Copeland Corporation - Sidney OH

F25B 4104

62131

Compressor discharge temperature, ambient outdoor air temperature and thermal load are used as control parameters for controlling the expansion valve setting and indoor fan speed. Diagnostics monitor a feedback signal from the fan motor to detect fan over-speed and increased speed due to decreased air flow caused by a dirty indoor air filter. Discharge pressure of the compressor is monitored to detect a blocked outdoor fan. The difference between actual and optimum compressor discharge temperatures and suction pressure of the compressor are monitored to detect a stuck-closed expansion valve or low refrigerant charge. Compressor "short-cycling" is limited to prevent reduced reliability of the compressor. The difference between compressor discharge temperature and outdoor coil temperature is measured before and after startup to detect compressor failure.

53816692, Jan 17, 1995

Jul 21, 1993

8/095897

Vijay Bahel - Sidney OH
Hank Millet - Piqua OH
Mickey Hickey - Sidney OH
Hung Pham - Dayton OH
Gregory P. Herroon - Piqua OH

Copeland Corporation - Sidney OH

F25B 4902

62129

The refrigeration control software periodically checks for overcharge and undercharge conditions by placing the expansion valve at a predetermined setting, based on measured environmental temperature. While the expansion valve is at the predetermined setting a series of compressor discharge temperature readings are taken to obtain an average reading and this average reading is compared with a reference value. An undercharge condition is declared when the average reading is greater than the reference value and an overcharged condition is declared when the average reading is less than the reference value.

56282010, May 13, 1997

Apr 3, 1995

8/415640

Vijay Bahel - Sydney OH
Hank Millet - Piqua OH
Mickey Hickey - Sidney OH
Hung Pham - Dayton OH
Gregory P. Herroon - Piqua OH
Gerald L. Greschl - Dayton OH

Copeland Corporation - Sidney OH

F25B 4104

62211

Compressor discharge temperature, ambient outdoor air temperature and thermal load are used as control parameters for controlling the expansion valve setting and the indoor fan speed. In a variable capacity system the thermal load parameter also controls the compressor capacity. Thermal load is measured by an integrating procedure that increments or decrements an accumulated demand counter value used as an indication of thermal load on the system. The counter value is incremented and decremented based on the room temperature and thermostat setpoint. These same parameters are also used in the overcharge/undercharge diagnostic system.

53035615, Apr 19, 1994

Oct 14, 1992

7/961139

Vijay Bahel - Sidney OH
Hank Millet - Piqua OH
Mickey Hickey - Sidney OH
Hung Pham - Dayton OH
Gregory P. Herroon - Piqua OH

Copeland Corporation - Sidney OH

F25D 1706

62186

The microprocessor-based control system selects the appropriate indoor airflow (fan speed) to place the system in an optimal efficiency range. The indoor fan speed is further controlled based on humidity measurements, to produce a slower airflow when conditions are humid. This helps remove a greater amount of moisture from the air. Occupant comfort is enhanced by microprocessor control of the indoor fan speed to stay within the boundaries of the cooling mode comfort envelope.

56899637, Nov 25, 1997

Sep 12, 1996

8/712904

Vijay Bahel - Sidney OH
Hank Millet - Piqua OH
Mickey Hickey - Sidney OH
Hung Pham - Dayton OH
Gregory P. Herroon - Piqua OH
Gerald L. Greschl - Dayton OH

Copeland Corporation - Sidney OH

F25B 4902

62129

Compressor discharge temperature, ambient outdoor air temperature and thermal load are used as control parameters for controlling the expansion valve setting and indoor fan speed. Diagnostics monitor a feedback signal from the fan motor to detect fan over-speed and increased speed due to decreased air flow caused by a dirty indoor air filter. Discharge pressure of the compressor is monitored to detect a blocked outdoor fan. The difference between actual and optimum compressor discharge temperatures and suction pressure of the compressor are monitored to detect a stuck-closed expansion valve or low refrigerant charge. Compressor "short-cycling" is limited to prevent reduced reliability of the compressor. The difference between compressor discharge temperature and outdoor coil temperature is measured before and after startup to detect compressor failure.