Maintenance and service
RTG 199 ME – 6 720 811 615 (2015/04)
39
C. Adjusting CO
2
:
Note
:
P1 adjustment will change the P2 reading. Confirm the P1
value BEFORE adjusting the P2 level.
1. If P1 CO
2
level is off:
▶ Loosen yellow painted Phillips screw (1) and cover should rotate
down (2) revealing a recessed brass slotted screw. Fig.64, page 39.
▶ Turning the slotted screw counter clockwise will raise P1 CO
2
levels
and clockwise will lower P1 CO
2
levels. Adjustments to the slotted
screw will also change P2 CO
2
levels.
▶ After bringing the P1 CO2 readings in proper range, press the
button to enter the P2 mode. Verify CO
2
readings in P2 mode.
2. If P2 CO
2
level is off:
▶ Remove yellow painted #40 Torx cover from the front of the gas
valve. (Fig.65, page 39) A plastic #40 Torx screw will be revealed.
▶ Turning the plastic #40 Torx screw counter clockwise will lower P2
CO
2
levels and clockwise will raise P2 CO
2
levels.
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
2
readings are within the ranges specified in
table36. Repeat steps 1 and 2 as necessary until CO
2
values are within
the specified ranges.
Final Readings
P1 CO
2
Reading:
% CO
2
P2 CO
2
Reading:
% CO
2
D. Returning to Service:
1. Return slotted screw cover to original position.
2. Reinstall Torx cover.
3. Remove CO
2
analyzer probe and reinstall flathead screw 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. 64 Adjusting P1 CO
2
level
Fig. 65 Adjusting P2 CO
2
level
CO
2
range (%)
Max. CO level
(measured)
Nat. Gas
max. input
P1
6.3 % - 6.9 %
< 250 ppm
min. input
P2
2.3 % - 2.6 %
< 60 ppm
LP Gas
max. input
P1
8.7 % - 9.3 %
< 250 ppm
min. input
P2
2.7 % - 3.0 %
< 60 ppm
* 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 36 CO
2
& CO target numbers
+
Summary of Contents for RTG 199 MEN
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