DeDietrich AWHP-2 MIT-IN-2 iSystem Installation And Service Manual page 56

4. Installation
54
4 SVmatic
Heating temperature setting = HEAP MAX:.
4 B control panel
Set the boiler thermostat to the same value as HEAP MAX:.
4 Other
Heating temperature setting = HEAP MAX:.
Operating principle
4 No back-up requested:
The boiler continues to provide DHW. Contacts AL1 and AL2 are
both open.
4 Back-up requested:
The AL2 contact closes.
The AL1 outlet is powered up: If the boiler is in domestic hot water
mode, the back-up pump is not tripped as the K relay is open. The
back-up pump is tripped when the domestic hot water load pump
stops.
AWHP-2 MIT-IN-2 iSystem
25/06/2014 - 7616371-001-04