User Manual

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Building Technologies Division CC1N7491en
18.07.2018
Connection diagram (cont’d)
Caution!
Connection of X500 with X900 – in each case without separate connection to
burner ground and protective – with fault, there is a risk of electric shock
hazard!
*) Applications L1 / L2 are only permitted in EC countries
**) Standard application with L / N for EC
Attention!
The mains power supply of PWM-controlled high-efficiency pumps (heating
circuit pump) must not be connected to terminal X3 pin 3 / pin 4.