6 720 680 174 (2014/05)Therm 8000S
Installation instructions | 31
▶Verify CO
2
readings in P2 mode.
Fig. 52 Adjusting P1 CO
2
level
If P2 CO
2
level is out of range:
▶ Remove yellow painted #40 Torx cover from the front of the
gas valve, Fig. 52 . A plastic #40 Torx screw will be
revealed.
▶ Turning the plastic #40 Torx screw counter clockwise,
will lower P2 CO
2
levels.
▶ Turning the plastic #40 Torx screw clockwise,
will raise P2 CO
2
levels.
Fig. 53 Adjusting P2 CO
2
level
▶Verify both P1 and P2 CO
2
readings are within the ranges
specified in Table 11 .
▶ Repeat steps 1 and 2 as necessary until CO
2
values are
within the specified ranges.
As soon as the levels of CO
2
are 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.
End of adjustments
▶ Record the final values in Table 12 .
Reassemble all parts in reverse order:
▶ Return slotted screw cover to original position and tighten
the philips screw, Fig. 52.
▶ Reinstall Torx protection cover, Fig. 53.
▶ Remove CO
2
analyser probe and reinstall flathead screw
with gasket in exhaust collar.
▶ Press ON/OFF button to turn OFF the heater.
▶ Press ON/OFF button to turn ON the heater.
Heater is ready for normal operation.
Note: This screw adjustment is very sensitive
and should be made in small increments. It
may take several minutes for readings to
stabilize.
CO2 range (%)
Máx. CO level
(measured)
Natural gas
Max. input P1 from 7.8% to 8.4% < 250 ppm
Min. input P2 from 2.0% to 2.4% < 60 ppm
Butane
Max. input P1 from 10.2% to 10.8% < 250 ppm
Min. input P2 from 2.5% to 2.9% < 60 ppm
Note: Values above are for climate controlled conditions.
Inputs such as gas pressure, heating value of the gas,
humidity and temperature of combustion air all impact CO
and CO
2
values. Changes in these inputs can result in
different CO and CO
2
values on the same appliance.
Table 11 CO
2
& CO target numbers
Program CO
2
values measured Date
P1 ______________ %
P2 ______________ %
Table 12
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