Compit SOLARCOMP 951 Installation And Operating Instructions Manual page 33

Variant no. 15
Tank loaded from two solar panels – system with a switching valve.
•
Circulation pump control.
•
Tank loading
The controller switches the valve so that the tank is loaded from the warmer solar
panel. Tank loading takes place as a function of temperature difference T1-T2 or T4-T2. If
such difference exceeds the value set in D.02 PANEL-TANK DELTA FOR PUMP ON, then
the controller starts P1 pump. The pump is started at full speed, which is reduced if the
temperature difference drops below D.02 PANEL-TANK DELTA FOR PUMP ON. If the
difference drops below parameter D.03.PANEL-TANK DELTA FOR PUMP OFF, the pump
is switched off. Minimum speed of the pump is limited by parameter D.01. P1 PUMP
MINIMUM SPEED and should be set to ensure stable operation of the pump. If minimum
speed is set at 100% then the on/off operation mode is enabled. The loading of the tank
stops when temperature T4 exceeds the value set in B.01. DHW TANK SET
TEMPERATURE.
DHW circulation
DHW circulation is described on page 19.
S C 951 model u7.x, Rev. 1
OLAR OMP
I II
T1 T4
P1
Z
P3
T3
T2
33