07/2015
Temperature Difference Controller TDC 3
Page 40 of 47
7.7.1 Heat metering
Activate or deactivate the heat metering function
Settings range: On/off /default setting: Off
7.7.2 AF type
Adjust the type of glycol that has been used in the system.
Settings range: Ethylene/Propylene /default setting: Ethylene
7.7.3 Glycol portion
Adjust the percentage of glycol that has been used in the system.
Settings range: 0 - 60 % /default setting: 40 %
7.7.4 Flow rate
Adjust the flow rate according to the system.
Settings range: 10 - 5000 l/h /default setting: 500 l/h
7.7.5
∆
T Offset
Since the calculation of the heat metering is based on the temperature of the collector and storage
where measuring takes place, a possible deviation from the flow and return temperature can be
compensated with this value.
Example: Displayed collector temp. 40 °C, measured flow temp. 39 °C, displayed storage
temp. 30 °C, measured return temp. 31 °C means a setting of -20 % (Displayed
∆
T
10 K, actual
∆
T 8 K => -20% correction value)
Settings range: -50 % to +50 % /default settings: 0 %
7.8
Start aid function
With some solar systems, especially with vacuum tube collectors, it may occur that the
measurement value acquisition at the collector sensor occurs too slowly or too inaccurately
because the sensor is often not at the hottest location. When the start help is
activated the following sequence is carried out:
If the temperature at the collector sensor increases by the value specified under
“Increase” within one minute, then the solar pump is switched on for the set “Purging
time” so that the medium to be measured can be moved to the collector sensor. If
this still does not result in a normal switch-on condition, then the start help function is
subject to a 5-minute lockout time.
Start help setting range: on, off/default setting: off
Purging time setting range: 2 ... 30 sec./default setting: 5 sec.
Increase setting range: 1 °C....10 °C/default setting: 3 °C/min.
Caution
This function should only be activated by a specialist if problems arise
with acquisition of measurement values. In particular follow the instructions
from the collector manufacturer.