Bradford White RTG 199 MEN Installation And Operation Instructions Manual page 35

CO
max. input P1 6.3 % - 6.9 %
min. input P2 2.3 % - 2.6 %
max. input P1 8.7 % - 9.3 %
min. input P2 2.7 % - 3.0 %
* 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
Changes in these inputs can result in different CO and CO
values on the same appliance.
Table 36 CO & CO target numbers
2
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 level is off:
2
▶ 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
and clockwise will lower P1 CO
screw will also change P2 CO
▶ After bringing the P1 CO2 readings in proper range, press the
button to enter the P2 mode. Verify CO
2. If P2 CO level is off:
2
▶ 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 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 readings are within the ranges specified in
2
table36. Repeat steps 1 and 2 as necessary until CO
the specified ranges.
Final Readings
P1 CO Reading: % CO
2
P2 CO Reading: % CO
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 with gasket
2
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.
RTG 199 ME – 6 720 811 615 (2015/04)
Max. CO level
range (%) (measured)
2
Nat. Gas
< 250 ppm
< 60 ppm
LP Gas
< 250 ppm
< 60 ppm
values.
2
2
levels. Adjustments to the slotted
2
levels.
2
readings in P2 mode.
2
levels.
2
values are within
2
2
2
Fig. 64 Adjusting P1 CO
levels
2
+
Fig. 65 Adjusting P2 CO
Maintenance and service
level
2
level
2
39