Sunhome Tech SR1568 - System 22: Solar System with 1 Collector Field, 2 Tanks, Pump Switch Loading Tank, Preheating Return of Heating System

Operation manual of solar controller SR1568
Page 36 of 87
System 22: Solar system with 1 collector field, 2 tanks, pump switch loading tank,
preheating return of heating system
Description:
The controller calculates the temperature
difference between collector sensor T1 and
sensor T2 of tank 1, T4 of tank 2. If any
difference is larger than or identical to the
adjusted switch-on temperature difference,
then the corresponding solar circulation pump
(R1 and /or R2) will be switched on, the
corresponding tank will be loaded until the
switch-off temperature difference or the
maximum tank temperature is reached.
The priority logic effects prior loading of the
tank 1.
Another temperature difference between heat
source T5 and heating return T6 can be used to
control the 3-ways valve R4 to preheat the
return water of heating system by the solar
system.
Sensor
ports
Description
Relay
outputs
Description
T0
Selectable sensor, free
R1
Solar circulation pump 1
T1
Temperature of collector
R2
Solar circulation pump 2
T2
Temperature of tank 1 base
R4
3-ways valve for preheating return
T3
Temperature of tank 1 upper
( optional)
R3
Available selectable functions:
1.CIRC（DHW circulation）
2.OHDP（Thermal transfer）
3.SFB（Solid fuel boiler）
4.BYPR （ Circulation by-pass ）
5.TIMER（Timer function）
6.OPARR（Parallel relay）
T4
Temperature of tank 2 base
R5
T5
Temperature of tank 2 upper
for preheating return
HR
Back-up heating
T6
Temperature for heating return
pipe