Condenser control maintains stable refrigeration system discharge pressure by providing automatic cycling of the fans and water pumps of evaporative or air cooled condensers. Many other features are provided to compliment and enhance this control.

Controls up to 40 devices on a common discharge level. Factory-configurable devices includes any combination of:

Discharge pressure setpoint can be "fixed" by operator entry or "floating" based on ambient wet-bulb temperature  (monitors the outside humidity and temperature).

Control "steps" are incremented when the pressure exceeds the setpoint by a "next step" pressure differential (steps are decremented by a "previous step" differential).

A condenser setup matrix allows the operator to select and change the following at any time:

• The operation of each device at each step. Entries include stop/run, stop/highl/low (for 2-speed fans), or stop/auto/ hold (for VFD’s).

• The "soak" time for each step.

• The next and previous step delay time for each step.

• The high-to-low spin down time for 2-speed fans.

• The proportional, integral, and derivative constants for variable-speed fans.

The condenser setup matrix allows for:

• Any combination of device starting sequences.

• Multiple devices to be started or stopped on the same step.

• Manual override of automatic stepping via HOLD, LOAD "one step" or UNLOAD "one step" keys.

Two set-up matrices exist so that two different fan/pump operations may be preprogrammed by the operator for winter/summer applications. Matrix selection is manual but can be automatic based on ambient air temperature or any other system defined function.

Motor starter auxiliary contacts or motor current switches can be monitored via digital inputs to confirm a running operation of the fans or pumps.

Run time is recorded for each device.