| 主权项 |
1. A controller for a modular compact chiller unit configured for integration into a refrigeration system utilizing a plurality of modular compact chiller units, the controller comprising:
a plurality of modular compact chiller units, wherein each modular compact chiller unit includes a controller comprising: an expansion valve interface configured to provide control signals to an expansion valve of the modular compact chiller unit; a compressor interface configured to provide control signals to a compressor of the modular compact chiller unit; and a processing circuit configured to provide startup control, operational control, and shutdown control for the modular compact chiller unit, wherein each of the of plurality of controllers provides control signals to a discrete modular compact chiller unit; and a main controller configured to provide control signals to the plurality of controllers, wherein the plurality of modular compact chiller units operate in parallel to provide chilling for a single chilled fluid system; wherein the startup control comprises:
beginning opening an expansion valve to a pre-start position after a delay time has expired; while the expansion valve is in the pre-start position, receiving a signal from a pressure sensor, the signal representative of the pressure on the inlet side of a compressor for the modular compact chiller unit;while the expansion valve is in the pre-start position, comparing the signal representative of the pressure to a threshold; andwhile the expansion valve is in the pre-start position, providing a control signal to the compressor for the modular compact chiller unit that causes the compressor to activate for normal operation when the pressure meets or exceeds the threshold. |
