SR981S/SR982S operation manual of solar pump station
Page 23 of 85
System 4: 2 tanks controlled by pump 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 corresponding pump P1 or P2 is triggered. 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 P2 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
P2
Pump 2 for tank2’s solar
circuit
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)