SR981S/SR982S operation manual of solar pump station
Page 34 of 85
Input ports
Description
Output ports
Description
T1
Sensor of collector array
T2
Sensor on the bottom part of tank 1
P1
Pump 1 for tank 1 circuit
T3
Sensor on the top part of tank 1
H1
Back-up heat resource
T4
Sensor on the bottom part of tank 2
P2
Pump 1 for tank 2 circuit
T5
Sensor on the top part of tank 2
T6
Sensor on heating return
R2
T-valve for heat the heating return
T7
Sensor on the return pipe
T8
Sensor on the flow pipe( SR981S no)
System 15: 2 tanks controlled by T-valve logic + heat transfer between 2 tanks
Description:
Controller compares the temperature between T1 of collector array and T2 of tank 1 or T4
of tank 2, when temperature difference reaches its switch-on value (T1&T2 corresponding
DT1O, T1&T4 corresponding DT2O), then pump P1 is triggered, and simultaneously,
T-valve switches to its direction to heat the corresponding tank, tank is heated until tank
temperature reaches its maximum value or when temperature difference (T1&T2
corresponding DT1F) or ( T1&T4 corresponding DT2F) drops to the switch-off value, then
P1,R1 are ceased.
Tank priority logic will decide to heat tank1 firstly.
Another temperature difference between T4 and T3 ( DT2O/DT2F) to control pump P2 to
transfer thermal energy from tank1 to tank 2.
