SR981S/SR982S operation manual of solar pump station
Page 33 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 collector array circuit
T3
Sensor on the top part of tank 1
(optional)
H1
Back-up heat resource
T4
Sensor on the bottom part of tank 2
R1
T-valve switched between tank 1
and tank2
T5
Sensor on the top part of tank 2
(optional)
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 14: 2 tanks controlled by pump logic + T-valve for return heating
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, P2 are triggered, 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, P2 are ceased.
Tank priority logic will decide to heat tank1 firstly.
Another temperature difference between T5 and T6 ( DT3O/DT3F) to control pump R2 to
heat the heating return by solar.
Note:
when T5 is not installed, then temperature difference between T4, T6
( DT3O/DT3F)
is used to control T-valve R2
See detailed in 8.4.8/8.4.9