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”
- “Control input (DI 1) function” or “Control input (DI 2) function”.
Possible settings:
Selection option | Function control input DI 1 or DI 2 |
|---|---|
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 MANUAL1) | 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 switchover3) | Contact open: “Heating” active. Contact closed: “Cooling” active. |
1)Function: See section “Adjustment - Manual operation”.
2)Function: See section “Key lock on”.
3)To guarantee the heating/cooling switchover function operates correctly at the digital input:
- go to “Settings” menu, “Set auto control”, “Settings assistant” and select the “Heating & cooling” application plus
- go to “Settings” menu, “Set auto control”, “Heating/cooling switchover” and select the “Binary input” option as switchover criterion.
Override function priorities
Priority* | Function |
|---|---|
1 | OFF, External OFF (binary input), External OFF (bus system) |
2 | MAX, External MAX (binary input), External MAX (bus system) |
3 | MIN, External MIN (binary input), External MIN (bus system) |
4 | MANUAL, External MANUAL (binary input) |
* Priority 1 = highest priority
Key lock priorities
Priority* | Function |
|---|---|
1 | Key lock: digital input active |
2 | Key lock active via menu and buttons |
3 | Key lock: not active |
* Priority 1 = highest priority
Priorities for heating/cooling switchover using binary input
Priority* | Function |
|---|---|
1 | Cooling |
2 | Heating |
* Priority 1 = highest priority