ESBE VTC 512 and 531 valve characteristics

— ESBE VTC 512 is a 3-way thermal valve with external threaded connections.

— ESBE VTC 531 is a 3-way thermal valve with 3 shut-off valves with internal thread, pump connection, 3 thermometers and insulation.

— They are installed in heating systems with solid fuel boilers with buffer tanks CAS.

— Maintaining the temperature in the boiler min. 60°C which protects the boiler from condensation.

— The built-in thermostat starts releasing water from the return flow of the installation when the boiler reaches temp. 60°C.

— At a boiler temperature below 60°C, the circulation pump returns water from the main flow to the return flow via a short circuit

circuit through the VTC valve.

— The circulation pump must be selected according to the size of the boiler, i.e. from the table with recommended pumps.

5/4''

5/4''

5/4''

5/4''

Alpha1 32-40

Yonos PICO 30/1-4

BOILER RETURN FLOW PROTECTION

Boiler heat output

kW

VTC 512

connection

(external thread)

VTC 531

connection

(internal thread)

Circulation pump type

Buffer tank CAS volume with pyrolytic boilers

BioTec-L /-C /Plus

14-25

Grundfos

Wilo

26-40

Alpha1 32-60

Yonos PICO 30/1-6

41-50

51-60

5/4''

5/4''

5/4''

5/4''

Alpha1 32-80

Magna1 32-40

Yonos PICO 30/1-8

Yonos PICO 30/1-8

Minimum 50 lit. / kW

61-70

6/4''

6/4''

Magna1 32-40

Yonos PICO 30/1-8