Operation manual of solar controller SR658
Page 28 of 105
System 13: Solar system with 1 collector field, 2 tanks, thermal energy transferring
Description:
The controller calculates the temperature difference between collector sensor T1 and tank
1
’s sensor T2. If the difference is larger than or identical to the adjusted switch-on
temperature difference, then solar circulation pump (R1) will be switched on, and this tank
will be loaded until the switch-off temperature difference or the maximum tank temperature is
reached.
Thermal energy transferring between 2 tanks:
When
tank 1’s temperature reaches the switch-on temperature (L1H2O), and temperature of
tank 1 is larger than tank 2 (T3>T4),
pump R2 is triggered; when tank 1’s temperature drops
below its switch off temperature (L1H2F) or temperature of tank 2 rises to the same
temperature of tank 1, or temperature of tank 2 reaches its maximum value S2MAX, then
pump R2 is stopped
When
tank 2’s temperature reaches the switch-on temperature (L2H1O), and temperature of
tank 2 is larger than tank 1 (T4>T3), pump R3
is triggered; when tank 2’s temperature drops
below its switch off temperature (L2H1F) or temperature of tank 1 rises to the same
temperature of tank 2, or temperature of tank 1 reaches its maximum value SMAX, then
pump R3 is stopped.
Please refer the Paragraph of "DLHTX Thermal energy transferring between tanks"
Sensor Description
Relay Description
T1
Temperature of collector
R1
Solar circulation pump 1
R2
Heating transfer pump 2
T2
Temperature of tank 1 base
R3
Heating transfer pump 3
T3
Temperature of tank 1 upper
(optional)
R4
1.CIRC
（
DHW circulation
T4
Temperature of tank 2
R5
1.Thermostat function
2. OHDP
（
Thermal transfer
）
T5
Sensor for DHW temperature or
for flow switcher (optional)
