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Measuring Gas Pressure; Adjusting Co2 (Carbon Dioxide) - Bosch Therm 8000 S GWHC 27 CTDE Installation And Operating Instructions Manual

Condensing gas water heater
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B The following operations must be carried
out by a quali ed technician.

8.2 Measuring gas pressure

Con rm gas pressure after installation.
Connecting manometer
B Shut o gas supply.
B Remove the front cover (ver Fig. 23 ).
B Loosen screw inside left test point tting (do not remove)
and connect manometer tube to test point.
Fig. 48 Gas pressure test port (left tapping)
Static Pressure Test
B Turn gas supply back on.
B Record static gas pressu re reading in table 8.
Static Gas Pressure Reading
Pressure: ___________________ Date: ___________
Operating Gas Pressure Reading
Pressure: ___________________ Date: ___________
Table 8
Operating Pressure Test
B Press ON/OFF button to turn o the appliance.
Therm 8000 S
Installation instructions | 29
B Press and hold "Program" button and press ON/OFF button
to turn appliance ON (Fig. 49 ).
Fig. 49 Gas tunning mode
B As soon as '188' is displayed, release "Program" button
, and the display reads P2.
B Press
until P1 appears.
NOTE: While in this mode the appliance will
run constantly at maximum power and allow
maximum water ow.
For inlet gas pressu re adjustment see values in table 9:
Gas type
Table 9
B Turn on high volume of hot wa
burner will light. If heater display reverts to P2, open more
hot water xtures to allow su cient ow. Press
P1 reappears on the display.
B Operate all other gas appliances on same gas piping system
at maximum output.
B Record lowest operating gas pressure reading in table 8.
Gas pressures lower than 2 kPa for Natural Gas or 3.0 kPa
for Butane will result in insu cient degree rise to the hot
water being used, r educed hot water volume, possible error
code faults and must be corrected.
Check gas pipes dimensions.
8.3 Adjusting CO
(carbon dioxide)
The CO2 can only be adjusted by a certi ed
gas technician with a calibrated CO2
ter ow (at least 15 l/m) and
6 720 680 174 (2012/09)



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