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34 | Troubleshooting
▶ Disconnect the pressure gauges from the pressure heads
points [A] and [B].
▶ Tighten the shutter screws of the pressure heads points [A]
and [B].
▶ Place front cover in the appliance.
▶ Turn ON the appliance to return to normal operation.
10.11 Adjusting Gas/Air flow
The CO
can only be adjusted by a certified gas technician
2
with a calibrated CO
analyzer.
2
CO
adjustment is required in Natural Gas
2
installations where energy content is less
than 900 BTU/cu ft, and in installations with
repeated unresolved errors (see chapter 11
"Problem solving").
CAUTION:
▶ One factor that may affect CO
improper gas pressure. Please see
Chapter 6.6 for the procedure to
measure gas pressure and record your
findings.
The P1 minimum operating gas pressure is 3.5" WC for Natural
Gas and 8" WC for Propane. Do not proceed in adjusting CO
until pressure is at or above these levels, but not to exceed
10.5" WC for Natural Gas and 13" WC for Propane.
Always start the adjustments by P1 followed
by P2.
10.11.1Access to CO
measuring port
2
▶ Open a hot water tap and let the appliance work for 2 or 5
minutes.
6 720 817 281 (2017/05)
▶ Insert CO
of the probe should be in the center of the Bosch logo
(approx 1.5" inserted).
Fig. 29
▶ Use a properly calibrated CO
following adjustments.
levels is
2
10.11.2Adjusting the maximum flow (Parameter P1)
▶ Press the button
▶ Press and hold simultaneously buttons
2
Fig. 30
▶ Press
appear on the display (factory default).
▶ Press
▶ Turn on high volume of hot water flow (at least 6 gpm) and
burner will light. If heater display reverts to P2, open more
hot water fixtures to allow sufficient flow. Press
P1 reappears on the display.
▶ Press
▶ Press the button
The appliance will start the auto adjustment of the
maximum gas flow.
analyzer probe into the measuring port. The tip
2
C0
measuring port
2
analyzer when making the
2
to turn ON.
for 3 seconds, until display reads P2.
to enter P2 adjustment. The current setting will
or
until P1 appears.
or
until U1 appears.
.
Greentherm 9800 SEO 160/199 | SECO 199
,
and
until
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