Technische Alternative UVR 16x2 User Manual

Solar cooling
129
Solar cooling
Function description
Solar thermal systems often have an unusable excess yield during the summer months. This
function can be used at night to dissipate some of the excess energy by pumping it at a controlled
rate from the lower section of the cylinder into the collector, after a critical temperature is exceeded
in the cylinder. System downtime during the day as a result of excess temperature shutdown can
often be prevented in this way.
Input variables
Enable
General enabling of the function (digital value ON/OFF)
Reference temperature
Analogue input signal from the sensor which will trigger the function
Minimum reference
temperature
Analogue value specifying the temperature threshold T.ref. min. which
will trigger the function
Offset min. reference
temp.
Analogue value specifying an offset for the minimum reference
temperature
Parameters
Time window
Start
End
Time window for active cooling
Reference temperature
T.ref. min.
Diff. on
Diff. off
Display of the temperature threshold (input variable)
Start differential for T.ref. min.
Stop differential for T.ref. min.
Correcting var.
Setting for the correcting variable for the pump; selection of the
analogue output (O12-O16)
➢ Energy saving: Tests have shown that adequate cooling can be achieved even at low
speeds. We therefore recommend that you use a speed stage just above zero circulation.
Output variables
Cooling
Pump status ON/OFF; selection of the output
Correcting var.
The correcting variable as currently set; selection of an analogue
output for electronic pumps
Set reference temperature
Display of the T.ref. min. temperature threshold including the Offset
value
Time window
Status ON when the time window applies
T.ref. > T.ref. min.
Status ON if T.ref. > (T.ref. min. + Offset + Diff.)

Technische Alternative UVR 16x2 Specifications

General

Brand	Technische Alternative
Model	UVR 16x2
Category	Controller
Language	English