Bosch Therm 8000 S GWHC 27 CTDE Installation And Operating Instructions Manual page 31

B Verify CO readings in P2 mode.
2
level
Fig. 52 Adjusting P1 CO
2
If P2 CO level is out of range:
2
B Remove yellow painted #40 Torx
gas valve, Fig. 52 . A plastic #40 Torx screw will be
revealed.
B Turning the plastic #40 Torx screw counter clockwise,
will lower P2 CO levels.
2
B Turning the plastic #40 Torx screw clockwise,
will raise P2 CO levels.
2
Note: This screw adjustme nt is very sensitive
and should be made in small increments. It
may take several minu tes for readings to
stabilize.
Fig. 53 Adjusting P2 CO level
2
B Verify both P1 and P2 CO readings are within the ranges
2
speci ed in table 11.
Therm 8000 S
B Repeat steps 1 and 2 as necesssary until CO
Max. input P1 from 7.8% to 8.4%
Min. input P2 from 2.0% to 2.4%
Max. input P1 from 9.2% to 10%
Min. input P2 from 2.0% to 2.6%
cover from the front of the
Note: Values above are for climate controlled conditions.
Inputs such as gas pressure , heating value of the gas,
humidity and temperature of co
and CO
di erent CO and CO
Table 11 CO
End of adjustments
B Record the nal values in table 12.
Program CO
P1
P2
Table 12
Reassemble all parts in reverse order:
B Return slotted screw cover to original position and tighten
B Reinstall Torx protection cover, Fig. 53 .
B Remove CO
B Press ON/OFF button to turn OFF the heater.
B Press ON/OFF button to turn ON the heater.
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Installation instructions | 31
within the speci ed ranges.
As soon as the levels of CO2 ar e correct, verify the values of
CO corresponds to the limits of the table 11. If the values
exceed the limits, it is necessary to verify the ventilation
system and heat exchanger.
CO2 range (%)
Natural gas
Butane
mbustion air all impact CO
values. Changes in these inputs can result in
2
values on the same appliance.
2
& CO target numbers
2
values measured
2
______________ %
______________ %
the philips screw, Fig. 52 .
analyzer probe and re install athead screw
2
with gasket in exhaust collar.
Heater is ready for normal operation.
values are
2
Máx. CO level
(measured)
< 250 ppm
< 60 ppm
< 250 ppm
< 30 ppm
Date
6 720 680 174 (2012/09)