Fully pumped sealed primary systems

Fully pumped sealed primary system

• A pressure relief valve (P) (spring loaded safety valve set to operate at 3bar) must be fitted to the heating flow pipe as close as possible to the boiler.

• An expansion vessel (B) should be fitted to the heating return pipe close to the boiler and pressurised for the system volume according to the instructions supplied with the vessel.

• A pressure gauge (G) (3bar min.) must be fitted to the heating flow pipe.

• An automatic vent (N) must be fitted.