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Example: Program number 0
Max limit switch-off
value
Max limit switch-on
value
Min limit switch-on
value
Min limit switch-off
value
Difference switch-
on threshold
Difference switch-
off threshold
max When a sensor reaches this temperature, the output is blocked.
max The output previously blocked when max is reached is released when this temperature
is fallen short of. max generally limits storage. Recommendation: the switch-off point for
storage should be 3-5K higher (1-2K higher for pools) than the switch-on point. The
software does not allow for differences less than 1K.
Setting range: -30 to 149°C in increments of 1°C (for both thresholds, but max has to
be at least 1K greater than max)
min Above this temperature, the output is released.
min The output previously released via min is blocked at this temperature. min generally
prevents boilers from being clogged with soot. Recommendation: the switch-on point
should be 3-5K higher than the switch-off point. The software does not allow for a
difference less than 1K.
Setting range: -30 to 149°C in increments of 1°C (for both thresholds, but min has to
be at least 1K greater than min)
diff When the temperature difference between the two set sensors exceeds this value, this
output is released. diff is the basic function (differential control) of this unit for most
programs. Recommendation: In solar applications, diff should be set to 7 - 10K.
Somewhat lower values suffice for the feed pump program.
diff The output released previously when diff was reached is blocked again when this
temperature difference is reached. Recommendation: diff should be set at around 3 - 5K
(ex works = 4K). Although the software allows for a minimum difference of 0.1K between
the switch-on / off difference, no value below 2K should be entered due to transducer and
measurement tolerances.
Setting range: 0.0 to 9.9K in increments of 0.1K
10 to 98K in increments of 1K (for both thresholds, but diff has to be at
least 0.1K / 1K greater than diff)
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