Bosch C1210ES Specifications download pdf (Page 38)

38 | Maintenance and service

C 1210 ES/ESC6 720 644 887 (2014/11)

Condensing heat exchanger unit maintenance;

▶ Shut off power. Disconnect power cord.

▶ Dismantle all inlet, outlet pipes and the condensate tube from the

condensing heat exchanger unit.

▶ Remove the condensing heat exchanger unit from the appliance by

pulling it towards you.

▶ Dismantle all parts for inspection and cleaning.

Fig. 66 Condensing heat exchanger

▶ Check the condensing heat exchanger for any obstruction.

▶ Flush the condensing heat exchanger unit with water.

▶ Check all gasket and o-rings for damage and replace if necessary.

▶ Assemble the condensate unit and all other parts in reverse order of

disassembly.

7.5 Adjusting CO2

The CO2 can only be adjusted by a certified gas technician with a

calibrated CO2 analyzer.

Static Gas Pressure: “ WC

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

▶ Press ON/OFF button to turn OFF the heater.

▶ Remove brass flat head screw on the exhaust collar as seen in Fig.67.

▶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. 67 Measuring port

▶ Press the ON/OFF button to turn ON the heater.

▶ Press and hold simultaneously buttons or and for 3

seconds, until display reads P2.

Fig. 68

▶ Press button until “P1” appears on display.

B. Measuring CO

(Combustion cover Installed):

▶ 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.

▶ Record the CO

reading in P1 below. (Analyzer reading may take

several minutes to stabilize).

▶ Press the ‘+’ button until P2 appears. Unit will ramp down to low fire

and the water flow should decrease.

▶ 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.

It is important to inspect and properly replace the

gaskets and o-rings.

adjustment is required in Natural Gas

installations where energy content is less than 900

BTU/cuft, and in installations with repeated

unresolved EA and EC errors (ref. to page 44

“Problem solving”).

CAUTION:

▶ One factor that may affect CO

levels is improper gas

pressure. Please see Chapter 4.14 for the procedure

to measure gas pressure and record your findings

below:

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