Adjusting The Burner - Viessmann VITOPLEX 300 Service Instructions Manual

Commissioning, inspection, maintenance
Checking the mixer for ease of operation and...
3. Check the mixer for leaks. Replace the O-rings if
the mixer is leaking.
Checking the function of the return temperature raising facility (if
installed)
Checking the installation room ventilation
Checking the flue pipe for tightness

Adjusting the burner

Adjust the maximum oil or gas throughput of the
burner to the rated boiler heating output.
Rated heating out- Pressure drop on the hot gas
put side
kW
620
780
1000
1250
Partial load operation
Set the minimum heating output for the base load
stage in accordance with the flue system. The flue sys-
tem must be suitable for the low flue gas temperatures.
In the case of frequent cycling in standby mode and for
partial loads below 40 % we recommend that you:
■ Insulate the flue gas collector
Install a motorised flue gas damper
■
Set the minimum runtime of the boiler to 10 min
■
Operation with burner load
The minimum boiler water temperature for oil operation
is 40 °C and for gas operation 50 °C.
To protect the boiler, the minimum heating output in the
base load stage is set to 60 % of the rated heating out-
put (see table).
16
Pa mbar
350 3.5
400 4.0
400 4.0
500 5.0
60 %
≥
(cont.)
4. Snap the motorised lever into place.
Rated heating out- Pressure drop on the hot gas
put side
kW
1600
2000
To protect the system against dew point corrosion,
burner stage 2 (full heating output) must be set to the
rated boiler heating output. It must remain switched on,
even during the summer months (burner stage 2 on
constant standby).
This extends the service life and reduces running
costs.
Rated heating out- Minimum heating output to
put be set (burner stage 1)
kW
620
780
1000
1250
1600
2000
Pa mbar
850 8.5
800 8.0
kW
372
468
600
750
960
1200