Operation manual of solar controller SR658
Page 20 of 105
System 5: Solar system with 1 collector field, 2 tanks, pump -logic control
Description:
The controller calculates the temperature difference between collector sensor T1 and tank 1
and tank 2’s base sensor T2 and T4. If any difference is larger than or identical to the
adjusted switch-on temperature difference, then the corresponding solar circulation pump
(R1 or R2) will be switched on, 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.
Please refer the Paragraph of "LLOGI Tank priority logic"
Sensor Description
Relay Description
T0
Temperature of solid fuel boiler (optional)
R1
Solar circulation pump 1
T1
Temperature of collector
R2
Solar circulation pump 2
T2
Temperature of tank 1 base
R3
1. SFB
（
Solid fuel boiler
）
T3
Temperature of tank 1 upper (optional)
R4
1.
CIRC
（
DHW
circulation
）
T4
Temperature of tank 2 base
R5
1. TIMER
（
Timer function
）
2. OPARR
（
Parallel relay
）
3. Thermostat function
4.
OHDP
（
Thermal
transfer
）
T5
1. Temperature of tank 2 upper (optional)
2.Sensor for DHW temperature or for flow
switcher (optional)
T6
Optional free sensor, undefined(optional)
T7
Temperature for thermal energy
measurement (optional)
HR
Back-up heating
