Thermic 3-way valve ESBE series VTC300 designed to protect boilers up to 30 kW from return temperatures that are too low. ESBE series VTC300 also efficiently loads accumulation tanks. Maintaining a high and stable return temperature means a higher level of boiler efficiency, reduced tarring and increased life span of the boiler. In most applications, the valve is installed either in the return pipe to the boiler or in the accumulation tank feeding pipe.

Usage

• Heating
• Solar systems

The glycol content of the medium is max. 50%. In the case of glycol concentration of 30-50% it is necessary to take into account the reduction of the maximum output flow by 30-40%!

Valve function

The function of the valve is independent of its assembly position. The valve contains a thermostat which begins to open connection A at an outgoing mixed water temperature in connection AB. Connection B is fully closed when the temperature in connection A exceeds the nominal opening temperature with 10°C. It is recommended to use shut-off valves in the application to facilitate service.

Service and maintenance

Spare parts are available for most major parts. In most cases, it is not necessary to remove the valve from the application during service. The thermostatic cartridge can be easily replaced with a cartridge with a different opening temperature. Cartridges are labeled VTC300…

Features

• Medium temperature: 0… 100 °C
• Leakrate A - AB: Tight seal
• Leakrate B - AB: max 3% Kvs
• Max. differential pressure when mixing 1bar / when distributing 0.3bar