15
Checking the Vitoair draught stabiliser (if installed)
Release the latch on the control disc.
The control disc must swing freely during burner oper-
ation.
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
output
Pressure drop on the hot gas
side
kW
Pa
mbar
90
40
0.4
115
60
0.6
140
80
0.8
180
100
1.0
235
200
2.0
Rated heating
output
Pressure drop on the hot gas
side
kW
Pa
mbar
300
200
2.0
390
200
2.0
405
250
2.5
500
330
3.3
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).
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.
This extends the service life and reduces running
costs.
Operation with burner load
≥
60 %
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
Minimum heating output
to be set (burner stage
1)
kW
kW
90
54
115
69
140
84
Rated heating output
Minimum heating output
to be set (burner stage
1)
kW
kW
180
108
235
141
300
180
390
234
405
243
500
300
Commissioning, inspection, maintenance
Checking the flue pipe for leaks
5692818
