Setting The Gas Pressure Controller - Rotex A1 BG Installation And Maintenance Instructions Manual

7 x Gas burner
Limiting the minimum burner output
Raising the minimum burner output would be advisable, for ex-
ample, if the flue gas side resistance were relatively high and the
flame became unstable with a minimum load, or if the partial load
demands were not fulfilled when designing the flue gas system.
1. Enter the access code for the heating expert and call up the
parameter level "Expert Config".
2. The minimum equipment output is limited by the parameter
"Fan Min". Enter parameter "Fan Min".
3. Enter the output change on the settings type plate and in the
operating manual and confirm with signature.
Adjusting the starting output
Usually, the burner start is problem free and quiet, if the burner
adjustment has been completed correctly (see section 7.3.2) with
the factory set starting output.
If a clear puffing or whistling should occur during start, or if mul-
tiple start attempts are regularly required, a slight change to the
start power may help.
For deflagrations: Reduce the starting output.
For starting problems such as burner whistling or flame
forming: Increase the starting output.
To change the starting output:
1. Enter the access code for the heating expert and call up the
parameter level "Expert Config".
2. The starting output is determined by the parameter "Fan Start
PWM". Enter parameter "Fan Start PWM".
3. Enter the starting power change in the operating manual and
sign it.

7.3.6 Setting the gas pressure controller

The gas valves are factory-set. As a rule, no changes should be
made to the gas pressure controller. The adjusting screw
(fig. 7-3, item 12) is hidden under a cover.
If the set value for Base Load deviates to much from the target
value or if the burner tends to whistle:
1. Adjust the adjusting screw for the gas pressure controller
(fig. 7-3, item 12) in small steps (maximum half a turn per
adjustment step).
2. After each adjusting step, wait at least 2 minutes.
3. Check the changes in the combustion quality with a flue gas
analyser.
If the burner creates noises at the least output setting
(Base Load), you should (depending on the weather!):
set the min. output to a higher value.
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FA ROTEX A1 BGe - 02/2014