A temperature/pressure control operates the burner on a gas fired hydro heat system.

• A. True
• B. False
• C. Not sure
• D. Depends on system

Answer: (A)

In a gas-fired hydronic heating system, the burner is controlled by a temperature/pressure control that monitors the water temperature (and system pressure) and regulates the gas valve accordingly. When heat is needed and the water is below the setpoint, the control allows the burner to ignite and heat the water. Once the water reaches the desired temperature (within safe pressure limits), the control shuts the burner off. This keeps the system producing heat only as needed and protects it from overheating or overpressure, which is why a temperature/pressure control is the device that operates the burner.