Solar working station operation manual SR881
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2.4 System description
Note:
T3 is alternative sensor, when no sensor (T3) is installed on the top part of tank, controller
will use the signal of sensor T2 automatically to control the auxiliary heating or the
circulation pump.
1 collector array
– 1 storage tank – 1 pump and auxiliary heating
Description:
The solar circuit pump (P1) is switched on as soon as the switch-on temperature difference
(
△
Ton) between the collector array (T1) and the storage tank (T2) is reached. If the
temperature difference between the collector array (T1) and storage tank (T2) drops below
the switch-off temperature difference (
△
Toff), or the temperature of storage tank (T3)
reaches the preset maximum storage temperature, then the solar circuit pump (P1) is
switched off.
Back-up heating by auxiliary boiler
(detailed see paragraph 4.3):
Within the preset schedule of back-up heating, if the temperature T3 is below the switch-on
temperature, then the back-up heating
（
H1
）
is triggered, when T3 is heated to the
switch-off temperature, back-up heating H1 is ceased.
T0: Temperature sensor for thermal energy measuring (optional sensor)
T1: Temperature sensor for collector array
T2: Temperature sensor on the bottom part of tank 1.
T3: Temperature sensor on the top part of tank (optional sensor)
T4:Temperature sensor on pipe for CIRC function(optional sensor)
P1: Solar circuit pump
H1: output for back-up electrical heater
