Technische Alternative ESR 31 Series User Manual

17
Software version VR / VD
Software version of the device (VR = version with relay output, VD = speed version). It can-
not be changed as it indicates the intelligence of the device and must be provided if there are
any queries.
Program number PR
Selection of the appropriate program according to the selected diagram. For a solar thermal
system, that would be the number 0 or 1.
Set values (min, max, diff)
The device does not have any switching differentials (difference between temperatures to
switch on or off); rather, all of the threshold values are divided into switch-on and switch-off
values. In addition, some programs have several similar thresholds such as max, max2. To
make a distinction, the index for max is also displayed in the left parameter line.
CAUTION: When setting the parameter, the computer always limits the threshold value (such
as max on) when it approaches a certain temperature of the second threshold (such as
max off) to prevent negative hysteresis. If a threshold cannot be changed any longer, the
second threshold has to be changed first.
max When this temperature has been reached, the output is blocked (ex works = 65°C).
max The output blocked at max  is released again when this temperature has been
reached. max generally serves to limit storage. Recommendation: The switch-off
point should be some 3-5K higher than the switch-on point in the storage area and
some 1-2K higher than in the pool area. The software does not allow for differences
less than 1K (ex works = 60°C).
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  When this temperature has been reached at the sensor, the output is released
(display only with the corresponding program diagram) (ex works = 5°C).
min  The output previously released via min  is blocked again when this temperature
has been reached. min generally protects the boilers from soot. Recommendation:
The switch-on point should be some 3-5K higher than the switch-off point. The soft-
ware does not allow for differences less than 1K (ex works = 0°C).
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  If the temperature difference between the two set sensors surpasses this value, the
output is released. For most programs, diff is the basic function (differential control-
ler) of the system. Recommendation: For solar applications, diff should be set
to around 7-10K (factory settings WE = 8K). Slightly lower values suffice for the
loading pump program (ex works = 8K).
diff  The output previously released when diff  was reached is blocked again when
this temperature difference is reached. Recommendation: diff  should be set to
around 3-5K (WE = 4K). Although the software allows for a minimum difference of
0.1K between the switch-on and switch-off points, no value less than 2K can be en-
tered for sensor and measurement tolerance (ex works = 4K).
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)

Technische Alternative ESR 31 Series Specifications

General

Brand	Technische Alternative
Model	ESR 31 Series
Category	Control Unit
Language	English