Installation and Operating Guide

Troubleshooting
65
Greentherm T9900 SE/i – 6 720 813 635 (2022/01)
8.12.2 Manual Gas and Air Adjustment
Gas and Air adjustment is also possible to perform manually.
This is only recommended if the automatic adjustment process
is not possible to complete successfully.
To perform MA Manual Adjust of Gas/Air flow;
▶ After enter CA Combustion Adjust menu,
▶ Touch symbols or to select MA menu.
▶ Touch the symbol to enter MA menu.
Fig. 61 Manual Adjust - MA
Access P1 menu (maximum power)
L1 Gas Adjust
▶ Touch the symbol to enter P1 menu.
Display shows L1 Gas Adjust.
Fig. 62 L1 Gas Adjust - Open Taps
▶ Open hot water taps when the display shows Open Taps.
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).
Display shows Output Power (%) when there is enough
water flow.
1)
▶Change L1 Gas Adjust parameter until power reaches
100% ± 2%
▶Increase L1 Gas Adjust parameter to increase output
power, and vice-versa.
How to enter a new tuning parameter (i.e. L1, L2, A1, A2).
▶ Select the desired parameter.
▶ Touch the symbol .
The symbols appears in the display.
▶ Change to the desired value.
▶ Touch the symbol when finished.
The symbols disappear.
▶ L1 Gas Adjust is now complete.
A1 Air Adjust
▶ Touch symbols or until display shows A1 Air
Adjust - ION.
▶Change A1 Air Adjust parameter until ION ratio reaches
100% ± 2%.
Fig. 63 A1 Air Adjust - ION
▶Increase A1 Air Adjust parameter to increase ION ratio and
vice-versa.
A1 Air Adjust is now complete.
1) More flow may be required if inlet water temperature is
high, i.e. applications with waste water recovery system,
preheated solar water.