Rotex GCU compact 315, Installation And Maintenance Instructions Manual

Page: 53 / 84

7 x Heat cell with gas burner
9. Check flow pressure.

The gas inlet flow pressure must not drop appreciably
below the resting pressure minus the pressure drop in the
gas connection hose (see tab. 12-6). If the flow pressure
is too low, the burner output also drops.
10. If the measured flue gas values do not change any more (at
the earliest 2 min after the start of the burner), measure the
CO
2
and the O
2
contents. Compare the measured values with
the specified setting values (see chap. 7.3.1).
a) If the O
2
/CO
2
concentrations lie within the permissible
values:

No further measures are required.
b) If the O
2
/CO
2
concentrations lie outside the permissible
values:

Carry out a 100 % calibration and adjust [Drop Io-base] so
that the setting range is reached, see chap. 7.3.4 and
repeat the measurement.
11. In the program [Emission Measurement] choose the [Base
Load] setting, but do not confirm .
12. If the measured flue gas values do not change any more (at
the earliest 2 min after the start of the burner), measure the
CO
2
and the O
2
contents. Compare the measured values with
the specified setting values (see chap. 7.3.1).
a) If the O
2
/CO
2
concentrations lie within the permissible
values:

No further measures are required.
b) If the O
2
/CO
2
concentrations lie outside the permissible
values:

Carry out a 100 % calibration and adjust [Drop Io-base] so
that the setting range is reached, see chap. 7.3.4 and
repeat the measurement.
Changeover from natural gas to liquid gas
1. Turn the gas/air mix setting screw (fig. 4-44, item 3.1) to
position 2 .
2. Change the gas type in the controller RoCon BF as follows:
● Set the rotary switch to the
"Configuration"
position.

An overview is displayed.
● Use the rotary switch to select the
"Lambda-Gx"
level.

An overview is displayed.
● Use the rotary switch to select the parameter [Gas type]
and confirm.
● Use the rotary switch to select the value "Liquid gas".
● Confirm the changes with a brief push of the rotary switch.

Change has been accepted. Jump back to previous dis-
play.
3. Enter the gas type changeover on the settings type plate and
in the operating manual and confirm with your signature.
4. Affix a device sticker for the gas changeover on the burner
housing.
5. Start-up in accordance with chap. 5.1.3. In the event of
starting problems, see chap. 7.3.4.
You can find more detailed explanations and possible setting values for these pa-
rameters in the "ROTEX RoCon BF" controller operating instructions.
Resetting from Liquid petroleum gas to natural gas
1. Turn the gas/air mix setting screw (fig. 4-44, item 3.1) to
position 1 .
2. Change the gas type in the controller RoCon BF as follows:
● Set the rotary switch to the
"Configuration"
position.

An overview is displayed.
● Use the rotary switch to select the
"Lambda-Gx"
level.

An overview is displayed.
● Use the rotary switch to select the parameter [Gas type]
and confirm.
● Use the rotary switch to select the value "Natural gas".
● Confirm the changes with a brief push of the rotary switch.

Change has been accepted. Jump back to previous dis-
play.
3. Enter the gas type changeover on the settings type plate and
in the operating manual and confirm with your signature.
4. Affix a device sticker for the gas changeover on the burner
housing.
5. Start-up in accordance with chap. 5.1.3. In the event of
starting problems, see chap. 7.3.4.
You can find more detailed explanations and possible setting values for these pa-
rameters in the "ROTEX RoCon BF" controller operating instructions.
7.3.4 Starting problems - calibrating the firing unit,
setting the burner blower starting output and
gas volume
The factory-set starting output usually provides a problem-free,
quiet burner start.
The starting output of the burner blower is factory-set.
If during the starting process an obvious deflagration or whistling
sound occur, or several starting attempts are necessary on a
regular basis, a slight change in the starting output may help.

For deflagrations: Reduce the starting output or gas vol-
ume.

In the event of difficulties starting such as burner whistling
or flame formation: Increase the starting output or gas vol-
ume.
ROTEX recommends the following procedure for rectifying
general starting problems :
Calibration of the firing unit
In the event of starting problems, the starting output of
the burner blower can be changed by the heating tech-
nician and the firing unit can be recalibrated automati-
cally.
You can find more detailed explanations and possible setting
values in the "ROTEX RoCon BF" controller operating instruc-
tions. This documentation is included in the scope of delivery.
CAUTION!
The firing unit is programmed to take into account the ageing of
the components. Calibration of the firing unit can still have a
negative impact on this despite compliance with the flue gas
setting values (tab. 5-1 to tab. 5-4).
● Only calibrate the firing unit when the flue gas setting values
are not adhered to or when a mechanical change has been
made, e.g. by replacing the component with ROTEX original
spare parts.