Bosch C1210ES Specifications download pdf (Page 43)

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Maintenance and service

P1 Operating Pressure: “ WC

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,

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.

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

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

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.

B Record the CO

reading in P2 below.

P1 CO

Reading: % CO

P2 CO

Reading: % CO

Note: When making adjustments, make sure

combustion cover is installed.

C. Adjusting CO

Note: P1 adjustment will change the P2 reading.

Confirm the P1 value BEFORE adjusting the P2

level.

1. If P1 CO

level is incorrect:

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

levels. Adjustments to the slotted screw will

also change P2 CO

levels.

B After bringing the P1 CO

readings into proper

range, press the button to enter the P2 mode.

Measure CO

readings in P2 mode.

2. If P2 CO

level is incorrect:

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

levels and clockwise

will raise P2 CO

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 that both P1 and P2 CO

readings are within

the ranges specified in table 24. Repeat steps 1 and 2

as necesssary until CO

values are within the specified

ranges.

range (%) Max. CO level

(measured)

Nat. Gas

max. input P1 8.3 % - 8.9% < 290 ppm

min. input P2 2.1 % - 2.4 % < 60 ppm

LP Gas

max. input P1 9.9 % - 10.5 % < 290 ppm

min. input P2 2.5 % - 2.8 % < 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

values. Changes in these inputs can result in

different CO and CO

values on the same appliance.

Table 24 CO

& CO target numbers

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 71 72

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Bosch C1210ES Specifications Page 43

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