Sunhome Tech SR1568, Operation Manual

Page: 38 / 87

Operation manual of solar controller SR1568
Page 37 of 87
System 23: Solar system with east/west collector fields, 2 tanks, valve switch loading
tank, preheating return of heating system
Description:
The controller calculates the temperature
difference between collector sensor T1, T0 and
sensor T2 of tank 1, T4 of tank 2. If any difference
is larger than or identical to the adjusted switch-on
temperature difference, then the corresponding
solar circulation pump (R1 and /or R2) will be
switched on, and simultaneously valve R4 turns to
the corresponding tank, the corresponding tank
will be loaded until the switch-off temperature
difference or the maximum tank temperature is
reached.
a
The priority logic effects prior loading of the tank
1.
Another temperature difference between heat
source T5 and heating return T6 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 1 R1 Solar circulation pump 1
T1 Temperature of collector 2 R2 Solar circulation pump 2
T2 Temperature of tank 1 base R4 3-ways valve for switch the tank
T3 Temperature of tank 1 upper
( optional) R5 3-ways valve for preheating return
T4 Temperature of tank 2 base 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 tank 2 upper
for preheating return HR Back-up heating
T6 Temperature for heating return
pipe