Adjusting Co2 - Bosch Therm C 1210 ES Installation And Operating Instructions Manual
Indoor residential and commercial models
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Also See for Therm C 1210 ES:
- Applications manual (40 pages) ,
- Technical service bulletin (2 pages) ,
- Installation manual (72 pages)
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It is important to inspect and properly replace the gaskets and
o-rings.
▶ 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.
CO
adjustment is required in Natural Gas installations where
2
energy content is less than 900 BTU/cuft, and in installations
with repeated unresolved EA and EC errors (ref. to page 60
"Problem solving").
CAUTION:
▶ One factor that may affect CO
pressure. Please see chapter 4.14 for the procedure to
measure gas pressure and record your findings below:
Static Gas Pressure:
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, 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. 66.
C 1210ES/ESC – 6 720 644 887 (2022/04)
levels is improper gas
2
" WC
" WC
▶ Insert CO
analyzer probe into the measuring port. The tip
2
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. 66
Measuring port
▶ Push and hold the
▶ Turn power back on by pushing the power button
▶ Continue to hold the
screen light up and the temperature reads 188 °C.
▶ When display reads 188, immediately release the
button.
The display should now read P2.
▶ Press
button until "P1" appears on display.
B. Measuring CO
2
▶ 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.
2
▶ Record the CO
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
P1 CO
Reading:
2
P2 CO
Reading:
2
Note: When making adjustments, make sure combustion cover
is installed.
max. input
P1
min. input
P2
Maintenance and service
button.
P
button until all symbols on the
P
(Combustion cover Installed):
reading in P1 below. (Analyzer reading may
2
reading in P2 below.
2
% CO
2
% CO
2
CO
range (%)
Max. CO level
2
(measured)
Nat. Gas
8.3 % - 8.9 %
2.1 % - 2.4 %
.
P
< 290 ppm
< 60 ppm
53
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