Two-step heating
The heating output or the internal relay can be utilized for controlling an
additional heat source in a second heating step. See the description of the
outputs/relay under the heading “Connecting the units” in the previous
installation chapter.
When the heating demand has been 100 % during a period that exceeds
the time delay that has been set via parameter P_1058, a 100 % output
signal is fed out to the heating output. This then remains at 100 % until
the heating demand drops below 95 % and no signal is then fed out to the
output. W4.1 and normal cooling/heating operation: Heating step 1 on the
normal heating output and heating step 2 on the internal relay.
W4.1 and change-over operation: Heating step 1 on the cooling output and
heating step 2 on the heating output.
W4.2: Two-step heating can only be run in combination with change-over:
Heating step 1 on the cooling output and heating step 2 on the internal
relay.
The Two-step heating function must be activated with parameter P_1057.
Relay function, Off/On
The function activates/deactivates the controller’s relay function via a
parameter.
CONDUCTOR
W4
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