System-Specific Functions - Viessmann SCU224 User Manual

SCU224

System-specific functions

Thermostat function
Backup heating
Use of surplus energy
AH O:
Thermostat switch-on tem p.
Adjustment range:
30.0 ... 200.0 °F
[0.0 ... 95.0 °C]
in steps of 1.0 °Ra [0.5 K]
Factory setting:
110.0°F [40.0 °C]
AH F:
Thermostat switch-off tem p.
Adjustment range:
30.0 ... 200.0 °F
[0.0 ... 95.0 °C]
in steps of 1.0 °Ra [0.5 K]
Factory setting:
120.0 °F [45.0 °C]
t1 O, t2 O, t3 O:
Thermostat switch-on time
Adjustment range:
00:00 ... 23:45
Factory setting: 00:00
t1 F, t2 F, t3 F:
Thermostat switch-off time
Adjustment range:
00:00 ... 23:45
Factory setting: 00:00
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The following functions are exclusively available in system
layout 3. The corresponding channels will not be available in
any other system layout.
The thermostat function works independently from the
solar operation and can be used for using surplus energy
or for backup heating.
• AH O < AH F
thermostat function for backup heating
• AH O > AH F
thermostat function for using surplus energy
The symbol will be shown on the display if the second
relay output is activated.
Reference sensor for the thermostat function is S3!
In order to block the thermostat function for a certain
period, there are three time frames t1 ... t3. If the function
should be active between 6:00 and 9:00, set t1 O to 6:00
and t1 F to 9:00.
If all time frames are set to 00:00 o'clock, the thermostat
function is continuously activated (factory setting).