US 9,476,624 B2 · Scroll compressor differential pressure control during compressor shutdown transitions

Abstract

A method including determining whether an OFF criterion is satisfied for a lag compressor of a tandem set of scroll compressors. The tandem set of scroll compressors includes a lead compressor. The method further includes: initiating at least one process when the OFF criterion is satisfied; and maintaining the lag compressor in an ON state for a predetermined period subsequent to the OFF criterion being satisfied. The at least one process includes at least one of: operating the lead compressor at a maximum level; overriding a motor overload protection method, wherein the motor overload protection method protects motors of the lead compressor and the lag compressor; and overriding a proportional integral derivative (PID) method to reduce a speed of a condenser fan. The PID method controls the speed of the condenser fan. A system including the lag compressor module and the lead compressor module.

Claims20

Dependent claims

A method comprising:

while a lag compressor is in an ON state, determining whether an OFF criterion is satisfied to transition the lag compressor of a tandem set of scroll compressors from the ON state to an OFF state, wherein the tandem set of scroll compressors comprises a lead compressor;
initiating at least one process in response to the OFF criterion being satisfied;
and
maintaining the lag compressor in the ON state for a predetermined period subsequent to the OFF criterion being satisfied,
wherein the at least one process comprises at least one of
overriding a called for opening percentage of the lead compressor including operating the lead compressor at a maximum level,
overriding a motor overload protection method, wherein the motor overload protection method protects motors of the lead compressor and the lag compressor, and
overriding a proportional integral derivative (PID) method to reduce a speed of a condenser fan, wherein the PID method controls the speed of the condenser fan.

5 more elements

A system comprising:

a lag compressor module configured to, (i) while a lag compressor is in an ON state, determine whether an OFF criterion is satisfied to transition the lag compressor of a tandem set of scroll compressors from the ON state to an OFF state, and (ii) maintain the lag compressor in the ON state for a predetermined period subsequent to the OFF criterion being satisfied, and wherein the tandem set of scroll compressors comprises a lead compressor;
and
a lead compressor module configured to, in response to the OFF criterion being satisfied, at least one of,
override a called for opening percentage of the lead compressor including operating the lead compressor at a maximum level,
override a motor overload protection method, wherein the motor overload protection method protects motors of the lead compressor and the lag compressor, and
override a proportional integral derivative (PID) method to reduce a speed of a condenser fan, wherein the PID method controls the speed of the condenser fan.

3 more elements

Dependencies are inferred from the claim text.

Scroll compressor differential pressure control during compressor shutdown transitions

Life of this patent

Scroll compressor differential pressure control during compressor shutdown transitions

Life of this patent

Abstract

Claims20