System Layout 10 - Viessmann SCU224 User Manual

SCU224

System layout 10

The controller calculates the temperature difference bet-
ween collector sensor S1 and tank sensor S2. If the diffe-
rence is larger than or identical to the adjusted switch-on
temperature difference (DT O), the solar pump will be
operated by relay 1, and the tank will be loaded until the
switch-off temperature difference (DT F) or the maximum
tank temperature (S MX) is reached.
If the maximum collector temperature (CMX) is reached, the
solar pump will be operated by relay 1 and the 3-way-valve
Arr 10
S1
R1
S4 / TR
Display Channels
Channel Description
COL x Temperature collector
TST x Temperature tank
S3 x Temperature sensor 3
S4 x Temperature sensor 4
TR x* Temperature return sensor
n % x Pump speed relay
h P1 x Operating hours R1
h P2 x Operating hours R2
kWh x* Heat quantity kWh
MWh x* Heat quantity MWh
TIME x Time
30
|
R2
will be operated by relay 2 in order to direct the surplus
energy to a heat dump. For security purpose this will be
carried out only if the tank temperature is below the non-
adjustable emergency shutdown of 200 °F.
Sensors S3 and S4 can optionally be connected for mea-
surement purposes.
If energy metering (OHQM) is activated, sensor S4 has to
be connected as return sensor.
VBus
9 10
S3
S2
Terminal Page
S1 37
S2 37
S3 37
S4 37
S4 37
R1 30
R1 38
R2 38
- 38
- 38
- 34