Viessmann SCU345 Manual page 55

ODTFT / DTREL
Relay
Selection: System 1: R2, R4
System 3: R3, R4
Factory setting: 4
The relay for the ∆T function can be selected.
Freely adjustable thermostat function
Backup heating
Use of surplus energy
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
OTH
Thermostat function
Adjustment range: ON / OFF
Factory setting: OFF
OTH / TH O
Thermostat switch-on temp.
Adjustment range: 0.0 ... 250.0 °C [30 ... 480 °F]
in steps of 0.5 °C [1.0 °F]
Factory setting: 40.0 °C [110.0 °F]
OTH / TH F
Thermostat switch-off temp.
Adjustment range: 0.0 ... 250.0 °C [30 ... 480 °F]
in steps of 0.5 °C [1.0 °F]
Factory setting: 45.0 °C [120.0 °F]
OTH / t1O
Switch-on time 1
Adjustment range: 00:00 ... 23:45
Factory setting: 06:00
in steps of 15 min
In order to block the thermostat function for a cer-
tain period, there are three time frames t1 ... t3. The
switch-on and switch-off times can be adjusted in
steps of 15 minutes. If the switch-on and the switch-
off times are identical, the time frame is inactive.
If the thermostat function should run from 06:00 a.m.
and 09:00 a.m. only, adjust t1O to 06:00 a.m. and t1F
to 09:00 a.m.
The fi rst time frame is factory set from 06:00 to 22:00.
If the switch-on and switch of times of a frame are set
to an identical value, the time frame is inactive. If all
time frames are set to 00:00, the thermostat function
is solely temperature dependent.
OTH / t1F
Switch-off time 1
Adjustment range: 00:00 ... 23:45
Factory setting: 22:00
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