Placement of the pump. Circulating pumps in closed systems where the membrane is used to mount the tank on the return pipe, and at a distance than close to the diaphragm expansion tank.
When installing the pump in the heating system often make mistakes, which then reduces the service life, or remove it from the healthy state. The most common mistake is improper installation. It should be mounted so that the pump shaft was in a horizontal state as shown.
Pump module terminals must be placed on top. System before running should be carefully washed, and remove all solids. Before starting the pump with manual adjustment is not always to Bleed causing it to run dry and the pump is not lubricated. Another important detail such as: after open pump and run it after 5-10 minutes of operation, the pump must be stopped. This sequence must be followed.