SR971,SR972 Solar station operation manual
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21
6.6 System description
6.6.1 System (1 collector array
– 1 tank – 1 pump –auxiliary heating
）
Description:
The solar circuit pump (R1) 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 ( R1) is switched off.
Back-up heating by auxiliary boiler (detailed see paragraph 7.3):
Within the preset time section of back-up heating, if the temperature T3 of tank drops below the
switch-on temperature, then the circulation pump ( H1) of back-up heating is triggered, when T3 is
heated to the switch-off temperature, circulation pump H1 of back-up heating is ceased.
T1: Temperature sensor for collector
T2: Temperature sensor in the bottom of tank .
T3: Temperature sensor in the top of
tank (optional sensor)
T5: Temperature sensor on DHW hot
water return pipe (optional sensor)
T6: Temperature sensor flow into
pipeline
T7: Temperature sensor return back
pipeline
R1: Solar circuit pump ( connected on
controller already)
R4: DHW Hot water circulation pump
H1: Output for back-up electrical heater
Note:
T3 is an alternative sensor, when no sensor (T3) is installed in the top of tank, controller will
use the signal of sensor T2 automatically to control the auxiliary heating or the circulation
pump.
