Bosch C 1210 ES Installation Manual page 43

P1 Operating Pressure:
The P1 minimum operating gas pressure is 3.5" WC for
Natural Gas and 8" WC for Propane. Do not proceed in
adjusting CO until pressure is at or above these levels,
2
but not to exceed 10.5" WC for Natural Gas and 13"
WC for Propane.
A. Once Gas Pressure is adequate
B Press ON/OFF button to turn OFF the heater.
B Remove brass flat head screw on the exhaust collar
as seen in Fig. 68.
B Insert CO analyzer probe into the measuring port.
2
The tip of the probe should be in the center of the flue
pipe (approx 1.5" inserted). Avoid air gaps between
probe and measuring port as they can alter readings.
Fig. 68 Measuring port
B While holding the Program (P) button, press the ON/
OFF button to turn ON the heater (see Fig. 69).
When '188' flashes on the display, release the
Program button. The display should now read P2.
Press button until "P1" appears on display.
Fig. 69
B. Measuring CO (Combustion cover must be
2
installed):
B Open all hot water taps to achieve a flow rate of at
least 6 gallons per minute. (1 tub and 2 sinks should
be sufficient). If heater display reverts back to P2,
open more hot water fixtures to allow sufficient flow.
Press until P1 reappears on the display.
B Record the CO reading in P1 below. (Analyzer
2
reading may take several minutes to stabilize).
B Press the button until P2 appears. Unit will ramp
down to low fire and the water flow should decrease.
6 720 644 887
" WC B Record the CO reading in P2 below.
2
P1 CO Reading:
2
P2 CO Reading:
2
Note: When making
combustion cover is installed.
CO
max. input P1 8.3 % - 8.9%
min. input P2 2.1 % - 2.4 %
max. input P1 9.9 % - 10.5 %
min. input P2 2.5 % - 2.8 %
* 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 values. Changes in these inputs can result in
2
different CO and CO values on the same appliance.
2
Table 24 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 incorrect:
2
B Loosen yellow painted Phillips screw (1) and cover
should rotate down (2) revealing a recessed brass
slotted screw. Fig. 70.
B Turning the slotted screw counter clockwise will
raise P1 CO levels and clockwise will lower P1
2
CO levels. Adjustments to the slotted screw will
2
also change P2 CO
2
B After bringing the P1 CO
range, press the
Measure CO readings in P2 mode.
2
2. If P2 CO level is incorrect:
2
B Remove yellow painted #40 Torx cover from the front
of the gas valve. (Fig. 71) A plastic #40 Torx screw
will be revealed.
B Turning the plastic #40 Torx screw counter-
clockwise will lower P2 CO
will raise P2 CO levels.
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 that both P1 and P2 CO
the ranges specified in table 24. Repeat steps 1 and 2
as necesssary until CO
2
ranges.
Maintenance and service
% CO
2
% CO
2
adjustments, make
range (%) Max. CO level
2
(measured)
Nat. Gas
< 290 ppm
< 60 ppm
LP Gas
< 290 ppm
< 60 ppm
levels.
readings into proper
2
button to enter the P2 mode.
levels and clockwise
2
readings are within
2
values are within the specified
sure
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