Switching On The Heating System; Shutting Down The Heating System - Viessmann VITOTRONIC 300 Operating Instructions Manual

Switching on the heating system

E
D C
Fig. 12
ON/OFF switch
A
Fuses
B
ON indicator (green)
C
Ask your heating contractor about the following:
■ Boiler and relevant control unit type
Level of the required system pressure
■
Position of the following components:
■
– Pressure gauge
– Gas shut-off valve
– Vents
1. Check the heating system pressure at the
pressure gauge. If the pressure of the heating sys-
tem is too low, top up the water or notify your heat-
ing contractor.

Shutting down the heating system

With frost protection monitoring
For every heating circuit select the "Standby mode"
operating program
■ No central heating
■ No DHW heating
Frost protection for the boiler and the DHW cylinder
■
is active.
Without frost protection monitoring (shutdown)
1. Switch OFF the ON/OFF switch on every control
unit (see page 17).
2. Close the gas shut-off valves.
Lead boiler + cascade
1 2 3 4 5
A
B
Fault indicator (red)
D
Emissions test switch
E
(only for servicing purposes)
2. Open the gas shut-off valve on every boiler.
3. Switch ON the power supply, e.g. at a separate
MCB/fuse or a mains isolator.
4. Switch ON the ON/OFF switch on every control
unit.
After a short time, the standard menu (see page 10)
or the default display (see page 14 and 15)
appears. The green ON indicator illuminates. Your
heating system and, if installed, your remote con-
trols are now ready for use.
Single boiler system control: See page 25
Multi boiler system control: See page 28
Note
The circulation pumps are briefly started every 24
hours to prevent them from seizing up.
3. Isolate the heating system from its main power sup-
ply, e.g. at the separate MCB/fuse or at a mains
isolator.
!
Please note
If outside temperatures of below 3 °C are
expected, take appropriate measures to pro-
tect the heating system from frost.
If necessary, contact your heating contractor.
Start-up/shutdown
17