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Potterton Solar - Solar Thermal Domestic Hot Water System18
3.1.16Temperature difference control
The temperature difference control manages an output
according to adjustable temperature differential criteria.
The function is independent from all the other functions.
TDiff1 is the temperature of the heating source and TDiff2
of the heating target. Output A3 will be switched on
regarding the conditions below, when a timeframe is active.
3.1.17Tube collector
The function “tube collector” can be switched off/on in
the “Basic setting” menu – point 4.The timeframe 4 in the
“Program” menu makes it possible to activate this function
only for a certain period of time (sunshine period).When
activated, the solar pump will be switched on every 30
minutes for a period of 30 seconds.This is necessary, to
measure a temperature change in the collector if there
was no circulating for a long period of time.
3.2.1 Sensor monitoring
The sensors necessary for control functions and their
connecting cables are monitored regarding break and
short circuit. If a faulty sensor is recognised by the
software, the symbol is shown. By scrolling up and
down you can find an error source.
The use of temperature sensors of the wrongtype
can also lead to an error message
“Basic Setting” “Programming”
1
4 -- 3 Maximum temperature heating target max ºC
15 -- 5 Minimum temperature heating source min ºC
H
ysteresis Td max in K
Hysteresis Td min in K
Timeframe (1…3) Start: min time
Timeframe (1…3) Stop: max time
Corresponding values in the menu
“Basic Setting” “Programming”
4 -- 1 Timeframe (4) Start: min time
Timeframe (4) Stop: max time
Corresponding values in menu
A3 on TDiff >= TDiff2 + Diff.Tdmax and
TDiff2 < Diff.Tmax – 1 and
TDiff1>=Diff.Tmin + 1
A3 off TDiff1 < TDiff2 + Diff.Tdmin or
TDiff2 >= Diff.Tmax or
TDiff1<Diff.Tmin
!
!
Short circuit on temperature sensor of the current measuring point
Break on temperature sensor of the current measuring point,
circulation error at activated energy productivity measurement
Indication Meaning
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