Operation manual of solar controller SR658
Page 16 of 105
4.2 Description of 19 systems
System 1: Standard solar system with 1 tank, 1 collector field
Description:
The controller calculates the temperature difference between collector sensor T1 and tank
sensor T2. 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 the tank will be loaded
until the switch-off temperature difference or the maximum tank temperature is reached.
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. OHDP
（
Thermal transfer
）
T4
Sensor for thermostat
temperature (optional one)
R5
1. TIMER
（
Timer function
）
2. OPARR
（
Parallel relay
）
3. Thermostat function
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 one)
