Johnson Controls offers a wide range of solutions with either pressure, temperature or 0 to 10 V input for either single or three phase motor control.

These controllers are the most efficient and economic solution for head pressure control in air cooled condensers. They solve those problems you encounter with "on/off" controls, multiple speed motor combinations or where head pressure control is neglected. These electronic controls not only ensure a stable running condition throughout all seasons, but also save energy consumption and equipment service costs.

That's cool.

The series have a built-in suppression filter to comply with EMC regulations.
 
 
  P215 LR/BR/TR pressure input fan speed controllers are for max. 3 Amp single phase motors and are respectively used for condensers with single, dual and triple cooling circuits.

In the last two cases the controller selects the input with the greatest cooling demand. As an addition these controls can also be wired to give reverse action
 
 
  U215LR with 0 to 10 V/4 to 20 mA input is also for 3 Amp single phase motors.
 
 
  P215ST/DP with pressure input is for control of respectively max. 6 and max. 8 Amp single phase motors. The P215DP can be fitted with an additional pressure input.
 
 
  A/U/P255MM are for max. 5 Amp three phase motors. The difference in the series is the input.

The A255 is for a temperature input signal from an A99 sensor, the U255 for an input signal within the range of 0 to 10 V/4 to 20 mA and the P255 speaks for itself.