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Manafacture: Bosch File size: 2.87 mb File name: 79e6387b-8f42-49c7-955c-6908b859ddc9.pdf Language of manual:

Do not proceed in adjusting CO2 until pressure is at or above these levels, but not to exceed 14” WC. A. Once Gas Pressure is adequate B Turn ON/OFF switch to the OFF (O) position. B Remove brass flat head screw on the exhaust collar as seen in Fig. 40. B Insert CO2 analyzer probe into the measuring port. The tip of the probe should be in the center of the flue 6 720 608 263 30 6 720 608 263 Maintenance and service pipe (approx 1.5" inserted). Avoid air gaps between probe and measuring port as it can alter readings. Fig. 40 Measuring port B While holding the Program (P) button, turn the ON/ OFF switch to ON (I) position (see Fig. 41). As soon as ‘188’ flashes on the display, release the Program button. The display should now read P2. Press button until “P1” appears on display. Fig. 41 B. Measuring CO2 (Cover Installed): B Open all hot water taps to achieve a flow rate of at least 4 gallons per minute. (1 tub and 2 sinks should be sufficient). B Record the CO2 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 CO2 reading in P2 below. P1 CO2 Reading: % CO2 P2 CO2 Reading: % CO2 C. Adjusting CO2 (cover removed): Note: when making adjustments with the front cover off, CO2 values will be 0.3 - 0.5% lower than with the front cover on. Adjust values accordingly to make target numbers in Table 10 when cover is secured. Compare your readings to those found in Table 10. If CO2 readings are off, make adjustments as outlined below. Note: P1 adjustment will change the P2 reading. Confirm the P1 value BEFORE adjusting the P2 level. 1. If P1 CO2 level is off: B Loosen yellow painted philips screw (1) and cover should rotate down (2) revealing a recessed brass slotted screw. Fig. 42. B Turning the slotted screw counter clockwise will raise P1 CO2 levels and clockwise will lower P1 CO2 levels. Adjustments to the slotted screw will also change P2 CO2 levels. B After bringing the P1 CO2 readings in range, press the button to enter the P2 mode. Verify CO2 readings in P2 mode. Fig. 42 Adjusting P1 CO2 level 2. If P2 CO2 level is off: B Remove yellow painted #40 Torx cover from the front of the gas valve. (Fig. 43) A plastic #40 Torx screw will be revealed. B Turning the plastic #40 Torx screw counter clockwise will lower P2 CO2 levels and clockwise will raise P2 CO2 levels. Note: These screw adjustment are very sensitive and may take several minutes to stabilize. CO2 level Max CO level Nat. Gas max. input P1 9.7 ± 0.3 % 300 ppm min. input P2 9.5 ± 0.5 % LP Gas max. input P1 10.7 ± 0.3 % 300 ppm min. input P2 10.5 ± 0.5 % * Final reading must be confirmed with the front cover on, CO2 levels increase when the cover is installed. Table 9 6 720 608 263 Maintenance and service 31 Fig. 43 Adjusting P2 CO2 level 3. Verify both P1 and P2 CO2 readings are within the ranges specified in table 10. Repeat steps 1 and 2 as necesssary until CO2 values are within the specified ranges. 4. Once CO2 values are within the specified ranges, verify the CO readings on P1 do not exceed 300ppm (follow local codes). If values exceed this limit, inspect vent system and fin coils (Chapter 5.1) for blockage. D. Returning to Service: 1. Return slotted screw cover to original position. 2. Reinstall Torx cover. 3. Remove CO2 analyzer probe and reinstall flathead screw with gasket in exhaust collar. 4. Install front cover. 5. Turn ON/OFF switch to the OFF (O) position and then back to the ON (I) position. 6. Heater is ready for normal operation. Final Readings P2 CO2 Reading: % CO2 P1 CO2 Reading: % CO2 CO2 level Max CO level Nat. Gas max. input P1 9.7 ± 0.3 % 300 ppm min. input P2 9.5 ± 0.5 % LP Gas max. input P1 10.7 ± 0.3 % 300 ppm min. input P2 10.5 ± 0.5 % * Final reading must be confirmed with the front cover on, CO2 levels increase when the cover is installed. Table 10 Maintenance and service 5.5 Control board diagnostics 1. Turn on/off switch on water heater to off (O) position. 2. Press and hold the program ( ) button while turning the on/off switch to the on (I) position. The display will cycle through a startup procedure including the software version. 3. Release the ' ' button when '188' appears on the display. The display should read 'P2' when the program button is released. If not, repeat process. B Press and release the ' ' button on the control panel until the display reads 'P4'. You are now in the diagnostic mode of the control board. 4. When the display reads 'P4', press and release the ' ' button once again and the display should read 'E'. B Use the ' to cycleavailable. ' and ' through ' button differenton the control board diagnostic modes 5. Once in the selected diagnostic mode of your choice, press and release the ' ' button to display the diagnostic information. EXAMPLE: to read the flow rate in gallons per minute while the unit is flowing water, cycle to the '3d' mode and press the ' ' b...

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