Terminal Allocation In The Different System Layouts; System Layout 1 - Viessmann SCU224 User Manual

SCU224

1.4 Terminal allocation in the different system layouts

System layout 1

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.
Sensors S3 and S4 can optionally be connected for mea-
surement purposes.
Arr 1
S1
R1
S4 / TR
Display Channels
Channel Description
x*
INIT ODB initialization active
FLL x* ODB filling time active
x*
STAB ODB stabilization in progress
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 R1
hP x Operating hours R1
hP1 x* Operating hours R1 (if OBST is activated)
hP2 x* Operating hours R2 (if OBST is activated)
kWh x* Heat quantity kWh
MWh x* Heat quantity MWh
TIME x Time
6
|
If energy metering (OHQM) is activated, sensor S4 has to
be connected as return sensor.
If the drainback option (ODB) is activated, relay 2 can be
used to operate a booster pump by activating the booster
function (OBST).
Note:
Viessmann Vitosol collectors cannot be used in
drainback systems.
S3
S2
Terminal Page
- 37
- 37
- 37
S1 37
S2 37
S3 37
S4 37
S4 37
R1 38
R1 38
R1 38
R2 38
- 38
- 38
- 34