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Bosch Greentherm T9900 SE 160 Installation And Operating Instructions Manual page 62

Indoor residential tankless water heaters, 160 000/199 000 btu- natural gas 160 000/199 000 btu - liquefied petroleum lp gas
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Access to CA Combustion Adjust menu is only possible after
accessing to AU Technical Settings menu ( section 6.6).
After enter AU Technical Settings menu,
▶ Touch symbols
Display shows CA Combustion Adjust.
▶ Touch the symbol
UC - Auto Adjust
MA - Manual Adjust
Fig. 55
CA Combustion Adjust
8.12.1 Automatic Gas and Air adjustment
The UC Auto Adjust is the automatic Gas and Air adjustment
process. This process takes approximately 15 minutes, and
does not requires any intervention besides insuring that
enough water flow is provided to the appliance.
To perform UC Auto Adjust of Gas/Air flow;
After enter CA Combustion Settings menu,
▶ Touch symbols
▶ Touch the symbol
Automatic adjustment has initiated.
Fig. 56
Auto Adjustment
to select CA menu.
to enter CA menu.
to select UC menu.
to enter UC menu.
▶ Open hot water taps when the display shows Open Taps.
This message will appear approximately 5 minutes after
initiate the automatic adjustment.
The appliance will display Open Taps whenever more flow
is required to continue the automatic adjustment process
(1 tub and 2 sinks are usually sufficient).
Fig. 57
Auto Adjust - Open Taps
▶ Wait until a green check mark is displayed indicating the
successful conclusion of the automatic adjustment.
▶ Touch the symbol
Fig. 58
Auto Adjust complete
Gas and Air auto adjustment is complete.
In case of failure in the auto calibration process verify if:
▶ Gas type and pressure are correct ( section 4.13).
▶ Vent length is according to specification ( section 4.6).
▶ Wind conditions are stable (e.g. wind gusts may be a cause
of failure).
▶ Hot water flow is sufficient and stable (e.g. water from a
well is a potential source of water instability).
In case of positive results for all these actions:
▶ Perform manual adjustment according to chapter 8.12.2
or contact Bosch support line for further assistance.
Greentherm T9900 SE/i – 6 720 813 635 (2019/03)
to exit UC menu.



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