7.12 Connecting the external source pump

If the system has a common external source pump (Q8C), you can control it with the heat pump controller. Connect the source pump to the expansion module TC1.4 as follows:

• Control (230 V): relay Q1, contact Q14

• Regulation message (0–10 V): X3 and M

• Alert (DI): X4 and M

Connect the power supply of the external source pump always to the group centre of the property.

If the external source pump is not of the normal type, connect the control to the Q8 terminal strip and regulation message to the UX1 output (AO). If the control must be potential-free, add an auxiliary relay to the control unit.