Application and function of the digital control inputs DI1 and DI2
The pump can be controlled through external potential-free contacts at the digital inputs DI1 and DI2. The pump can be
- switched on or switched off,
- controlled to maximum or minimum speed,
- set manually into an operating mode,
- protected against changes of settings through control or remote control or
- switched between heating and cooling.
See section “Adjustment - Manual operation” for a detailed description of the OFF, MAX, MIN and MANUAL functions
In the “Settings” menu 
, select
- “External interfaces”
- “Function control input DI1” or “Function control input DI2”.
Possible settings:
Selection option | Function control input DI1 or DI2 |
|---|---|
Not used | The control input does not have a function. |
External OFF | Contact open: Pump is switched off. Contact closed: Pump is switched on. |
External MAX | Contact open: Pump is running in the mode set on the pump. Contact closed: Pump is running with maximum speed. |
External MIN | Contact open: Pump is running in the mode set on the pump. Contact closed: Pump is running with minimum speed. |
External MANUAL 1) | Contact open: Pump is running in the mode set Contact closed: Pump is set to MANUAL. |
External key lock 2) | Contact open: Key lock is deactivated. Contact closed: Key lock is activated. |
Heating/cooling switchover 3) | Contact open: “Heating” active. Contact closed: “Cooling” active. |
1) Function: see section “Adjustment - Manual operation”.
2) Function: see “Key lock On” section.
3) To guarantee the heating/cooling switchover function operates correctly at the digital input:
- go to “Settings” menu, “Set control mode”, “Setting assistant” and select the “Heating & cooling” application and
- go to “Settings” menu, “Set control mode”, “Heating/cooling switchover” and select the “Binary input” option as switchover criterion.
NOTICE
During regular operation, it is preferable to switch the pump on or off via the DI1 or DI2 digital input with EXT. OFF rather than via the mains voltage!
NOTICE
The 24 V DC power supply is only available when the analogue input AI1 or AI2 has been configured to a type of use and a signal type or when the digital input DI1 has been configured.