Viessmann OpenTherm User Manual

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You can change the display contrast in
stages.
1. Confirm "CONTRAST" with OK.
2. Use +/- to set the required value (0
to 15).
3. OK to confirm
Locking out controls (key lock)
You can lock out the controls by switch-
ing on key lock.
1. Confirm "KEY LOCK" with OK.
2. Press +/- to select "WITH KEY-
LOCK" or "NO KEYLOCK".
3. OK to confirm
The display then shows only "KEY
LOCK" and a key symbol.
Temporarily interrupting or unlocking key lock
Press and hold INFO for longer than 3
seconds.
You can then temporarily operate the
device or unlock the key lock. See
above.
Changing the display format of fault messages
1. Press OK to confirm the "ERROR
FORMAT".
2. Press +/- to select "HEXADECI-
MAL".
Do not adjust "DECIMAL".
3. OK to confirm
Returning all settings to their delivered condition
All settings made after commissioning
will be lost.
1. Confirm "FACTORY SET" with OK.
"CONFIRM" appears.
2. OK to confirm
Further adjustments
Setting the contrast
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Viessmann OpenTherm Specifications

General

Brand	Viessmann
Model	OpenTherm
Category	Temperature Controller
Language	English