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78 | Menu settings INSTALLER SETTINGS (for installers only) US/CA
8.5.8 Parameters for an external heat
exchanger
Menu: Solar sys parameters > D Ext heat
exchanger
Use this menu if you have an external heat
exchanger on your solar system.
PD: ON delta T: Use this menu option to set
the start temperature difference for the
secondary circuit pump (PD) between the
external heat exchanger and the solar tank.
If the difference between the measured
temperature in the solar tank (T
2
) and the
temperature measured on the solar tank
exceeds the set value, the secondary circuit
pump (PD) is switched on.
PD: OFF delta T: Use this menu option to set
the stop temperature difference for the
secondary circuit pump (PD) between the
external heat exchanger and the solar tank.
If the difference between the measured
temperature in the solar tank (T
2
) and the
temperature measured on the solar tank
drops below the set value, the secondary
circuit pump (PD) is switched off.
PD: Secondary circuit pump mode: Use this
menu option to select the operating mode of
the secondary circuit pump (PD) between the
external heat exchanger and the solar tank:
Auto: Automatically controlled operation
according to the set parameters.
Manual ON: Switches the pump
permanently on (e.g. for function test
when commissioning).
Manual OFF: Switches the pump
permanently off (e.g. for servicing work on
the pump without having to interrupt
heating operation).
For menu structure and adjustment ranges
Æ page 62.
78


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