Bosch Therm 8000 S Installation And Operating Instructions Manual page 30

30 | Installation instructions
CAUTION:
One factor that may affect CO
improper gas pressure.
▶ Check and adjust gas pressure, see
chapter 8.2.
When the gas pressure is correct:
▶ Press ON/OFF button to turn off the appliance.
▶ Remove plastic screw on the exhaust collar as seen in
Fig. 50.
6720608920-18. 1 AL
Fig. 50 Measuring port
▶ Insert CO analyser probe into the measuring port. The tip of
2
the probe should be in the center of the flue pipe (approx.
40mm inserted). Avoid air gaps between probe and
measuring port as they can alter readings.
▶ While holding the Program (P) button, press the ON/OFF
button to turn ON the heater (see Fig. 51).
Fig. 51
▶ While holding the Program
button to turn ON the heater. As soon as '188' flashes on the
display, release the Program button. The display should now
read P2.
+
▶ Press or button until "P1" appears on display.
6 720 680 174 (2014/05)
levels is
2
button, press the ON/OFF
P
Measuring CO (Combustion cover Installed):
2
▶ Open all hot water taps to achieve a flow rate of at least 15 l/
m (1 tub and 2 sinks should be sufficient). If heater display
reverts back to P2, open more hot water fixtures to allow
sufficient flow.
+
▶ Press until P1 reappears on the display.
▶ Record the CO reading in P1 in the Table 10 below.
2
Analyser reading may take several minutes to stabilize.
+
▶ Press button until P2 appears. Unit will ramp down to
low fire and the water flow should decrease.
Program CO values
2
P1 __________%
P2 __________%
Table 10
Adjusting CO
2
Note: P1 adjustment will change the P2
reading. Confirm the P1 value BEFORE
adjusting the P2 level.
If P1 CO level is out of range:
2
▶ Loosen yellow painted philips screw (Fig. 52, [1]) and
cover should rotate down (Fig. 52, [2]) revealing a recessed
brass slotted screw. (Fig. 52, [3]).
▶ Turning the slotted screw counter clockwise,
will raise P1 CO levels.
2
▶ Turning the slotted screw clockwise,
will lower P1 CO levels.
2
Adjustments to the slotted screw (P1) will
also change P2 CO
▶ After bringing the P1 CO2 readings in proper range, press
+
the button to enter the P2 mode.
levels.
2
Therm 8000S