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TDMA CONTROL 601/701:
7
Published 07/2007
System variation 1
Return flow tempe-
rature raising
No function, Solid
fuel boiler,
T-Pro
Return flow sensor
No winter switch
over
System variation 2, 3
Heating regulation
Inflow sensor
CONTROL 701
Regulator Setting
Sensor
System variation
1,2,3
Heating regulation
Inflow sensor
Solar Difference:
2...12 K
The temperature difference by which the collector sensor
temperature must be higher than the lower thermal store
temperature to enable solar loading of the thermal store is
set using the „Solar Difference“ function. A lower value
can be set if the pipe diameters are small and the insula-
tion is good. Long pipe runs, larger diameter pipework,
poor insulation or unfavourable sensor positioning require
a higher temperature difference.
Example:
With 15 mm diameter pipes, 20 m pipe run, an electri-
cally economic pump and good pipe insulation a value
of 6K can be set. Using a setting of 6K the solar pump
will switch on when the collector sensor temperature is at
least 6K higher than the lower thermal store temperature.
When the temperature difference between the collector
and the lower thermal store drops below 4K (hysteresis
of 4K set in the factory) the solar pump will switch off.
Solar pump: Inputs – Function - Output
Input
Function
Collector sensor
(in delivery package)
Top loading (Stratified
loading function)
Solar difference
Maximum solar input
Lower thermal store sensor
(in delivery package)
Solar difference
Maximum solar input
Inflow / Return flow sensor
(Art. N
o
. RE 046)
Winter switch over
Output: Solar pump
2.3.2 East-West-Valve-Regulation
A system which includes two solar collector array areas,
one oriented east and one oriented west, can be regulated
using the „East-West- Valve“ function.
Solar Difference 2:
2...12 K
The „Solar Difference 2“ function is used to set the tem-
perature difference by which the temperature registered at
the sensor on the second collector must be higher than the
temperaure at the lower thermal store sensor before solar
loading of the thermal store can begin. The „East-West-
Valve“ switches a three way valve to AB-A to divert the
warm water flow to the second collector when the second
collector is 3K warmer than the first collector.
East-West-Valve: Input - Function - Output
Input
Function
Collector sensor 2
(Art. N
o
. RE 040)
Solar difference 2
Maximum solar input
Output: East-West-Valve
2.3.3 Cooling, Twin Thermal Store and Swimming Pool
Regulating
It is possible to choose between the following functions us-
ing Optional Function 1: Cooling / Cooling via the heat-
ing circuit / Twin thermal store prioritizing / Twin thermal
store balancing / Swimming pool.
These functions prevent overheating of the collectors or al-
low a second thermal store to be loaded with hot water.
The solar pump continues to run while the thermal store
cools down, as long as the maximum collector or thermal
store temperature is not exceeded.
Cooling Optional Function:
If the upper thermal store temperature reaches the preset
value „cooling“ is activated. This function can be used for
example to control a thermal store loading pump to cool
the thermal store or to divert the heated water to another
thermal store.
Cooling temperature:
30...90 °C
The required cooling temperature can be set here.
Hysteresis:
2...10 K
The switch hysteresis for cooling can be set here.
For example, if a temperature of 85 °C and a hysteresis of
5 K is chosen, the contact will be closed at 85 °C and re-
opened at 80 °C.
Cooling via Heating Circuit Optional Function:
This function allows the thermal store to be cooled via a
heating circuit when it reaches a set temperature. The
mixer and the heating circuit pump will operate automati-
cally.
Setting the cooling temperature and hysteresis are de-
scribed under „Cooling Optional Function“.
Heating Circuit Inflow Temp: Target:
30...90 °C
The required heating circuit target inflow temperature can
be set here.
Optional Function Twin Thermal Store Prioritizing: When
the upper thermal store sensor reaches the preset tempera-
ture the „twin thermal store“ function is activated. This acti-
vates a three way valve so that the heat flow is diverted to
another thermal store, and simultaneously switches from
7


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