Pressurized Water Replenishment Unit: Ensuring Stable and Efficient HVAC Systems

Industrial and commercial HVAC systems need their water pressure regulated. Having a water replenishment system that is pressurized can automatically keep your system pressurized. This also prevents damage to your equipment and enhances efficiency.

What Is a Pressurized Water Replenishment Unit?

A pressurized water replenishment unit (PWRU) is a device that automatically adds water to a closed loop HVAC system when a low pressure condition is sensed. Components normally found in these units are a pump, pressure sensor, control valve and safety interlocks to assure safe and reliable operation. PWRUs alleviate problems associated with maintaining proper water levels within HVAC systems such as: introducing air into the system, pump cavitation and component failures due to pressure cycling.

Key Benefits of Pressurized Water Replenishment Units

1. Maintaining Consistent System Pressure

Erratic pressure can cause equipment failures, inefficiencies and accelerated wear and tear on equipment. PWRUs maintain system pressure within a predetermined range allowing flow rates and temperatures to stabilize throughout the system.

2. Lower Maintenance Costs

Automatic make-up reduces manual reset opportunities and likelihood of system downtime due to low pressure conditions. Lower maintenance costs and longer life expectancies on pumps, valves, heat exchangers, etc.

3. Improve HVAC Efficiency

Keeping system pressure at optimal levels allows for better flow of chilled/hot water which increases heat transfer efficiency of chillers, boilers and fan coil units. This leads to decreased energy usage and improved HVAC efficiency.

4. Safety & Reliable Operation

Modern PWRUs come standard with safety components like pressure relief valves, auto shut-off and alarms to prevent damage to the system caused by overpressure or dry-run conditions.

5. Multiple Applications

Pressurized water replenishment units can be used on many different systems, such as:

Commercial building chilled water loops

Industrial heating/cooling systems

Boiler feedwater systems

District heating & cooling

Selecting a Proper Pressurized Water Replenishment Unit

Select based on:

System volume and desired pressure range

Type and capacity of pump

Control and monitor characteristics

Connection to existing water treatment and/or HVAC systems

Selecting the proper unit allows you to maintain proper pressures with little loss of water and overall stability for years.

Conclusion

A pressure water replenishment unit (PWRU) automatically replenishes water in closed-loop HVAC systems keeping system pressure stable. PWRUs help maintain constant water level, increase system efficiency, minimize maintenance and maximize safety of commercial & industrial closed loop water circulation systems. Installing a PWRU can be a wise investment for building managers and engineers looking to safeguard their equipment, save energy and get the most out of their HVAC system.