Operation manual of solar controller SR658
Page 17 of 105
System 2: Solar system with 1 tank, 1 collector field, 3-ways valve for tank loading in
layers
Description:
The controller calculates the temperature difference between collector sensor T1 and tank
base and upper sensor T2, T3. If the difference is larger than or identical to the adjusted
switch-on temperature difference, the solar circulation pump (R1) will be switched on, and
simultaneously valve R4 turns to the corresponding tank zone and this zone will be loaded
until the switch-off temperature difference or the maximum tank temperature is reached.
The priority logic effects prior loading of the upper zone of the tank.
Please refer the Paragraph of "LLOGI Tank priority logic"
Sensor Description
Relay
Description
T0
Temperature of solid fuel
boiler (optional)
R1
Solar circulation pump
T1
Temperature of collector
R2
1.CIRC
（
DHW circulation
）
T2
Temperature of tank base
R3
1. SFB
（
Solid fuel boiler
）
T3
Temperature of tank upper
(optional one)
R4
1. Valve of solar circuit
T4
Sensor for thermostat
temperature (optional one)
R5
1. TIMER
（
Timer function
）
2. OPARR
（
Parallel relay
）
3. Thermostat function
4. OHDP
（
Thermal transfer
）
T5
Sensor for DHW temperature
or for flow switcher (optional)
HR
Back-up heating
T6
Optional free sensor,
undefined(optional)
T7
Temperature for thermal
energy measurement
(optional)
