76 | Gas type conversion
Copyright (optional information)6 720 643 068 (2011/06)
11.2 Installation location higher than
2,000 feet (610 m) above sea level
Input and output rates are reduced at higher altitudes due
to thin air with reduced oxygen levels.
ZBR42-3A... and ZWB42-3A... appliances are derated at
3 % per 1000 feet (305 m).
ZBR16-3A..., ZBR28-3A..., ZBR35-3A... and ZWB28-3A...
appliances offer altitude adjustment which compensates
for the effects of thin air, and are therefore NOT derated
up to 6000 feet (1829 m). Above 6000 feet (1829 m) a
rate of 3 % per 1000 feet (305 m) applies.
B Correction of the fan speed curve of the burner:
Use service function 0.d to adjust the elevation setting
(Æ page 72).
11.3 Setting the gas-air ratio (CO
2
or O
2
)
B Switch the appliance OFF using the ON/OFF switch.
B Remove the cover (Æ page 41).
B Switch the appliance ON using the ON/OFF switch.
B Open one of the flue gas test ports.
Fig. 69 Open one of the flue gas test ports
B Insert the probe approx. 2-3/4 inches (70 mm) into the
test port and seal around it.
B Press and hold the emissions test button until it
lights up.
The display shows the supply temperature alternating
with = maximum set output in heating mode.
B Briefly press the emissions test button .
The display shows the supply temperature in
alternation with = maximum nominal output.
B Measure the CO
2
or O
2
level and the CO content of the
flue gas (Æ Section 12).
The Bosch Greenstar boiler is factory set for
installation below 2000 feet (610 m) above
sea level.
6 720 641 933-79.1O
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