How to Pressurize a Hydronic System

Hydronic systems ensure the correct amount of water is moving through heating and cooling equipment. The system relies on a certain amount of air and water in the tank. Water fills the tank, increasing the compressed pressure of the trapped air. When a valve is opened, the air forces the water through the open line at a steady pressure flow. Sometimes, however, there may not be enough pressure in the tank due to a low-water level not reaching the fill line. You can pressurize the system by adding more water.

Pressure-regulating valve
Socket wrench
Copper water pipe, 6-inch

Instructions

- 1
  Apply plumber's Teflon tape on the end of the hydronic system's cold-fill pressure line by wrapping the tape along the pipe threads. Hand-tighten the pressure regulator valve outlet opening onto the cold-fill line.
- 2
  Adjust a socket wrench onto the valve nut to continue to tighten it on the threaded pipe line. Run a pipe line from your water main line to the pressure-regulating valve.
- 3
  Place plumber's tape on the pipe line and insert it into the intake side of the pressure-regulating valve. Tighten the valve nut until the pipe is secure on the valve.
- 4
  Set the pressure-regulating valve to the required cold pressure setting based on the manufacturer's instructions for the type of valve you purchased online or through a plumbing supply store. Turn on the water to fill the hydronic tank to the necessary water pressure. Allow the pressure regulator valve to close off the line when the correct pressure is reached.

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