Sunhome Tech SR1568, Operation Manual

Page: 25 / 87

Operation manual of solar controller SR1568
Page 24 of 87
System 10: Solar system with east/west collector fields, 1 tank, 3-ways valve loading
tank in layers, loading the heating return
Description:
The controller calculates the temperature
difference between collector sensor T1, T0 and
tank base/upper sensor T2, T3. If any difference
is larger than or identical to the adjusted
switch-on temperature difference, then solar
circulation pump (R1 and /or R2) will be switched
on, and simultaneously valve R4 turns to the
corresponding tank zone and this tank 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
Another temperature difference between heat
source T4 and heating return T5 can be used to
control the 3-ways valve R5 to preheat the return
water of heating system by the solar system.
Sensor
ports Description Relay
outputs Description
T0 Temperature of collector 2 R1 Solar circulation pump 1
T1 Temperature of collector 1 R2 Solar circulation pump 2
T2 Temperature of tank base R4 3-ways valve for loading tank in
layers
T3 Temperature of tank upper
( selectable) R5 3-ways valve for preheating the
return water
T4 Temperature of tank upper for
loading the heating return
water (selectable) R3 Available selectable functions:
1.CIRC
（
DHW circulation
）
2.OHDP
（
Thermal transfer
）
3.SFB
（
Solid fuel boiler
）
4.BYPR
（
Circulation by-pass
）
5.TIMER
（
Timer function
）
6.OPARR
（
Parallel relay
）
T5 Temperature of heating return
pipe HR Back-up heating
T6 Temperature for thermal
energy measurement
( selectable)