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MultiFlex CUB TD-Extra-Lite w/ Xfrmr
The MultiFlex CUB-II and CUB-TD boards are “smart” input/output boards designed to control single condensing units. A single condensing unit is a self-contained compressor and condenser bearing unit which controls refrigeration in a single case line-up or walk-in cooler. The MultiFlex CUB-II controllers are capable of commanding compressors, condensers, refrigeration, and defrost for a single condensing unit using on-board I/O and control algorithms. The CUB-TD controller is a more limited board that controls only condensers, using a temperature differential control strategy.
The MultiFlex CUB-TD is a “stripped” version of the MultiFlex CUB-II that includes only an algorithm for temperature differential (TD) condenser fan control. Up to four condensing unit fans are cycled on and off as required to meet compressor unit heat of rejection load. The TD algorithm subtracts plenum air temperature from the drop leg temperature and uses the difference between the two temperatures as a control value. If the difference is higher than the setpoint, the fans are staged on. If the difference is lower than the setpoint, the fans are staged off.
The temperature differential control capabilities of the CUB-TD are identical to those of a CUB-II operating in temperature differential mode, except the CUB-TD controls condensers only. The CUB-TD only has inputs for reading temperatures and outputs for controlling up to four fans. For control of any other single condensing unit subsystem, a CUB-II will necessary.
Part Number: 810-3081
