Checking The Vitoair Draught Stabiliser (If Installed); Adjusting The Burner - Viessmann Vitoplex 300 Service Instructions For Contractors

Checking the flue pipe for leaks

Checking the Vitoair draught stabiliser (if installed)

Release the latch on the control disc.

Adjusting the burner

Burner service instructions or separate docu-
mentation from the burner manufacturer
Adjust the maximum oil or gas throughput of the
burner to the rated boiler heating output.
Rated heating Pressure drop on the hot gas
output side
kW
90
115
140
180
235
Partial load operation
Set the minimum heating output for the base load
stage according to the conditions of the flue system.
Note that the flue system must be suitable for the low
flue gas temperatures that may occur.
In the event of frequent cycling in standby mode and
for partial loads below 40 %
Insulate the flue gas collector.
■
■ Install a motorised flue gas damper.
■ Set the minimum runtime for the burner to 10
minutes.
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 at
the base load stage is set to 60 % of rated heating out-
put.
Rated heating output
kW
90
115
140
Pa mbar
40 0.4
60 0.6
80 0.8
100 1.0
200 2.0
60 %
≥
Minimum heating output
to be set (burner stage
1)
kW
54
69
84
Commissioning, inspection, maintenance
The control disc must swing freely during burner oper-
ation.
Rated heating Pressure drop on the hot gas
output side
kW
300
390
405
500
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 output
kW
180
235
300
390
405
500
Pa mbar
200 2.0
200 2.0
250 2.5
330 3.3
Minimum heating output
to be set (burner stage
1)
kW
108
141
180
234
243
300
15