Operation manual of solar controller SR658
Page 18 of 105
System 3: Solar system with 1 collector filed, 2 tanks and thermal energy transferring
between 2 tanks
Description:
The controller calculates the temperature difference between collector sensor T1 and tank 1
base sensor T2. If the differences is larger than or identical to the adjusted switch-on
temperature difference, then the solar circulation pump (R1) will be switched on, tank will be
loaded until the switch-off temperature difference or the maximum tank temperature is
reached.
Thermal energy transferring means the other tank (2) is heated, another temperature
difference controls the running of pump R2
（
difference between T3 and T4 temperature.
）
Please refer the Paragraph of "HEATX Energy exchange between tanks"
Sensor Description
Relay
Description
T0
Temperature of solid fuel boiler
(optional)
R1
Solar circulation pump
T1
Temperature of collector
R2
Pump
for
thermal
transfer
between tank
T2
Temperature of tank 1 base
R3
1. SFB
（
Solid fuel boiler
）
T3
Temperature of tank 1 upper
(optional one)
R4
1. CIRC
（
DHW circulation
）
T4
Temperature of tank 2
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)
