SR981S/SR982S operation manual of solar pump station
Page 20 of 85
6.7 System description
Note:
T3 is an 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.
System 1: Standard system - 1 tank
Description:
The solar circuit pump (P1) is switched on as soon as the switch-on temperature difference
(DT1O) 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 (DT1F), or the temperature of storage tank reaches
its preset maximum storage temperature, then the solar circuit pump (P1) is switched off.
Input ports
Description
Output ports
Description
T1
Sensor of Collector
P1
Pump for solar circuit P1
T2
Sensor on the bottom part of tank
T3
Sensor on the top part of tank
H1
Back-up heat resource
T6
DHW sensor
R3
Pump for DHW circuit
T7
Sensor on the return pipe
T8
Sensor on the flow pipe( SR981S no)
List of available auxiliary functions in this system (functions are selectable)
Input ports
Description
Output ports
Description
T4
Sensor of thermostat function
R1
Selectable: (COOL) tank cooling
(AHO) thermostat; (BYPR) pipe
bypass
T5
Sensor on the solid fuel boiler
R2
Pump for solid fuel boiler (see
Paragraph 8.5.2)
Above mentioned auxiliary functions should be activated in menu in advance.