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Bosch 715ES Service Bulletin

Measuring and adjusting co2
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Service Bulletin G3-12
Models: 715ES, C800ES, C920ES, C920ESC, 2400ES, 2700ES
Measuring and adjusting CO₂
Introduction
NOTE: The CO
levels can only be adjusted by a trained gas
2
technician with a calibrated combustion gas analyzer. Please
note that a combustion gas analyzer is not the same equipment
as a CO detector.
Tools needed:
Combustion gas analyzer
Flat head screw driver
Phillips head screw driver
#40 Torx driver
Measure gas pressure
One factor that will affect CO
Please see bulletin G3-02 for the procedure to measure gas
pressure. Correct any deficiencies in gas pressure before
proceeding.
Preparation
1. Open several hot water taps and let the water heater run for 1-2
minutes. Close hot water taps and return to heater.
2. Push the ON/OFF button to the OFF (O) position.
3. Remove brass flat head screw with gasket on the exhaust collar
to reveal measuring port. (Fig. 1)
levels is improper gas pressure.
2
Figure 1
4. Insert CO
analyzer probe into the measuring port. The tip of the
2
probe should be in the center of the flue pipe (approx 1.5"
inserted).
5. While pressing the Program (
switch to ON (I) position. As soon as '188' flashes on the dis-
play, release the program button. The display should now read
P2. (Fig. 2)
. (Fig. 2)
Measuring CO
2
1. Open enough hot water taps to achieve a flow rate of at least 6
gallons per minute. (1 tub and 2 sinks should be sufficient)
2. Press the (
) button until P1 appears.
3. Record the P1 CO
reading below.
2
P1 CO
reading:
% CO
2
4. Press the (
) button until P2 appears. Unit will ramp down to
low fire and the water flow should decrease.
5. Record the P2 CO
reading below (Analyzer reading may take
2
several minutes to stabilize).
P2 CO
reading:
% CO
2
6. Compare your readings to those found in Table 1. If CO
readings are incorrect, make adjustments as outlined in the next
section.
) button, press the ON/OFF
Figure 2
2
2
2

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  Summary of Contents for Bosch 715ES

  • Page 1 Service Bulletin G3-12 Models: 715ES, C800ES, C920ES, C920ESC, 2400ES, 2700ES Measuring and adjusting CO₂ Introduction 4. 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”...
  • Page 2 Service bulletin 18 | G3-12 | 715ES, C800ES, C920ES, C920ESC, 2400ES, 2700ES Proper CO readings Table 1 Figure 4 Natural Gas LP Gas 715ES, 2700ES Max input P1 7.0 - 7.6 % 8.3 - 8.9 % 715ES, 2700ES Min input P2 2.3 - 2.6 %...

This manual is also suitable for:

C800es2400es2700esGwh c 920 esGwh c 920 esc