Heating Up; Shutting Down The System; Checking The Function Of The Safety Valves - Viessmann Vitoligno 250-S Installation And Service Instructions For Contractors

Commissioning, inspection, maintenance
Adjusting the heating curves
Changing the slope and level
Individually adjustable for each heating circuit.
110
3.5
A
+20 -20
Outside temperature in °C
Fig. 27
Changing the slope
A
Changing the level (vertical parallel offset of the
B
heating curve)

Heating up

Operating instructions

Shutting down the system

Danger
Contact with live or hot components can result in
dangerous injuries.
Switch OFF the mains supply (e.g. at a separate
MCB/fuse or a mains isolator) before starting
cleaning procedures and wait until the boiler has
cooled down.

Checking the function of the safety valves

30
1.4
B
0.2
(cont.)
Press the following keys in the standard menu:
1. For the extended menu.
å
2. / For selecting the heating circuit.
Ù Ú
3. / For "Heating curve".
| ~
4. d To confirm.
5. / For "Slope" or "Level".
| ~
6. To confirm.
d
7. / For the required value.
| ~
8. To confirm.
d
9. repeatedly, until the standard dis-
ä
play is shown.
1. Let the fuel burn out.
2. Once the boiler has cooled down, disconnect the
power supply.