Bosch 830 ES Installation And Operating Instructions Manual page 55

▶ Turning the slotted screw counter clockwise will raise P1
CO levels and clockwise will lower P1 CO
2
Adjustments to the slotted screw will also change P2 CO
levels.
▶ After bringing the P1 CO2 readings in proper range, press
+
the button to enter the P2 mode. Verify CO
in P2 mode.
2. If P2 CO level is off:
2
▶ Remove yellow painted #40 Torx cover from the front of the
gas valve. (fig. 62) A plastic #40 Torx screw will be
revealed.
▶ Turning the plastic #40 Torx screw counter clockwise will
lower P2 CO levels and clockwise will raise P2 CO
2
Note: This screw adjustment is very sensitive and should be
made in small increments. It may take several minutes for
readings to stabilize.
3. Verify both P1 and P2 CO
specified in table 36. Repeat steps 1 and 2 as necessary until
CO values are within the specified ranges.
2
Final Readings
P1 CO Reading:
2
P2 CO Reading:
2
D. Returning to Service:
1. Return slotted screw cover to original position.
2. Reinstall Torx cover.
3. Remove CO analyzer probe and reinstall flathead screw
2
with gasket in exhaust collar.
4. Press ON/OFF button to turn OFF the heater and then turn
ON the heater.
5. Heater is ready for normal operation.
Fig. 61 Adjusting P1 CO
830 ES – 6 720 644 936 (2021/08)
levels.
2
2
readings are within the ranges
2
% CO
2
% CO
2
level
2
2
readings
levels.
2
Fig. 62 Adjusting P2 CO
Maintenance and service
6720608158-38.1AL
level
2
55