
SR981S/SR982S operation manual of solar pump station
Page 25 of 85
System 6: 2 tanks controlled by T-valve logic
Description:
Controller compares the T1 temperature of collector and T2 temperature of tank 1, or and
T4 temperature of tank 2, when either one of 2 temperature differences reaches its
switch-on temperature difference (T1&T2 corresponding DT1O, T1&T4 corresponding
DT2O) , then the pump P1 is triggered, and simultaneously, T-Valve R1 switches its
direction to the corresponding tank; tank
is heated, until tank’s temperature reaches to its
preset maximum value, or when temperature difference (T1&T2 corresponding DT1F,
T1&T4 corresponding DT2F) drops to the preset switch-off value, then P1 and R1 are
ceased.
Tank priority logic will decide to heat tank1 firstly.
Input ports
Description
Output ports
Description
T1
Sensor of Collector
P1
Pump 1 for tank 1’s solar circuit
T2
Sensor on the bottom part of tank 1
R1
T-Valve switched tank1 or tank
2
T3
Sensor on the top part of tank 2
H1
Back-up heat resource
T4
Sensor on the bottom part of tank 2
T5
Sensor on the top part of tank 2
T6
DHW sensor
R3
Pump for DHW circuit
T7
Sensor on the return pipe
T8
Sensor on the flow pipe( SR981S no)