Bac Cooling Tower Water Level Control

BAC (Baltimore Aircoil Company) cooling towers use automatic water level control systems to maintain the correct basin water level and ensure reliable operation.

Here’s an overview of BAC cooling tower water level control:

Bac Cooling Tower Water Level Control - Components of the System

1. Bac Cooling Tower Water Level Control - Make-up Water Valve (Float Valve or Electronic Valve)

Adds fresh water to replace losses from evaporation, drift, and blowdown.

Operated by a mechanical float or electronic sensor.

2. Bac Cooling Tower Water Level Control - Float Assembly / Water Level Sensor

Mechanical float ball or electronic probes detect water level.

Signals the make-up valve to open/close automatically.

3. Bac Cooling Tower Water Level Control - Low Water Level Cut-out Switch (Optional)

Protects the pump from running dry.

Shuts down the system if water falls below safe level.

4. Bac Cooling Tower Water Level Control - Overflow & Drain Connection

Prevents flooding if valve sticks or excessive rainwater enters the basin.

Bac Cooling Tower Water Level Control - Operating Principle

As water evaporates, the basin water level drops.

The float sensor detects the low level → make-up valve opens → city water refills the basin.

Once the level reaches the set point, the valve closes automatically.

Overflow piping ensures excess water is discharged safely.

Bac Cooling Tower Water Level Control - Control Options in BAC Towers

1. Mechanical Float Valve (standard)

   Simple, low-cost, reliable.

   Common in small/medium BAC cooling towers.

2. Electronic Water Level Control (EWLC)

   Uses stainless steel probe sensors with a solenoid valve.

   Provides more precise control, adjustable set points.

   Recommended for large towers or where stable water control is critical.

Recommended Water Levels (Typical BAC Towers)

Normal operating level: At or just below the make-up float setting.

Minimum safe level: Above pump suction to prevent cavitation.

Overflow level: Slightly above float set point, to discharge excess water.

Here is a diagram showing BAC cooling tower basin with float valve, overflow, and drain points