Marley AIO (All-in-One) Control Panel

Cooling Tower Parts
Brand: Marley | Product Type: Cooling Tower Controls
Marley AIO Control Panel


The Marley® AIO Control Panel integrates multiple cooling tower control functions into one convenient and cost-saving panel – reducing field installation and startup time – benefitting the installing contractor and end user. Typically, each cooling tower cell uses one AIO control panel. Only a single-point incoming power connection is required to power the several integrated electrical control circuits included; all circuits are factory tested with associated sensors, and VFD is preprogrammed to jobsite motor and speed control signal.
Proof In Performance
Control options built into the AIO Control Panel are customer-configurable based on bid specification and job site requirements. A typical combination is the Variable Frequency Drive (VFD) for the fan motor, Basin Heater control, Water Level control, and Vibration Switch interface. The AIO Control Panel is operator-friendly with easy-to-understand visual displays and built to UL508A Industrial control panel standards.


  • NEMA 3R outdoor painted steel enclosure with cooling vents.
  • Main circuit breaker provides thermal and short circuit overload protection for the control panel. A single-point incoming power connection then distributes and reduces voltage to power various integrated control features. No upstream MOCP-rated device is required to protect the AIO control panel.
  • Local lockout/tagout padlock provisions provided at the panel’s main disconnect.
  • Integrated VFD is factory programmed with Marley cooling tower parameters and motor data.
  • Vibration switch interface for power and control.
  • Oil level switch interface circuit for power and control.
  • 120 VAC power for heat trace circuit when required for external water level stilling chamber.


  • By-pass motor starter.
  • Stainless steel NEMA 3R outdoor enclosure.
  • 65,000 SCCR (short circuit current rating).
  • Marley ABH (Advanced Basin Heater) cold-water basin heater controller.
  • 4-20mA transmitter card for remote monitoring of cold-water basin temperature.
  • LLC conductivity water level controller with makeup, alarms and cutout circuits.
  • LLC+u ultrasonic water level controller with makeup, alarms and cutout circuits.
  • VFD startup service, if required.
  Integrated, single-point power connection
  Fewer power feeds
  Pre-programmed and functionally tested
  Water level controls optional
  Basin heater circuit optional
  Vibration and oil level switch interface circuits
  Lockout/Tagout provisions provided