Gas type conversion
63
Greenstar FS/Combi FS – 6 720 810 590 (2020/04)
Fig. 72
▶ Fit the fixed gas throttle for LPG.
-or-
▶ Remove the LPG fixed gas throttle for NG.
Fig. 73
▶ Re-fit the gas pipe with gas/air premix chamber
▶ Reconnect the gas pipe connection
Check the CO
2
or O
2
level and the CO content of the flue gas.
▶ Affix the gas type label from the gas conversion kit to the original gas
type label covering the original gas type information located at the
bottom of the original gas type label.
Fig. 74 Attaching the rating plate
The Bosch Greenstar boiler is factory set for installation below 2000 feet
(610 m) above sea level.
12.1 Installation location higher than 2,000 feet (610m)
above sea level
Input and output rates are reduced at higher altitudes due to thin air with
reduced oxygen levels.
KBR42-3A... and KWB42-3A... appliances are derated at 3 % per 1000
feet (305 m).
KBR30-3A and KWB30-3A 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.
The Bosch Greenstar boiler is factory set for installation below 2000 feet
(610 m) above sea level.
▶ Correction of the fan speed curve of the burner:
Use service function 0.d to adjust the elevation setting ( page 60).
12.2 Setting the gas/air ratio (CO
2
or O
2
)
The gas-air ratio must always be set on the basis of a CO
2
or O
2
reading taken at maximum nominal output and minimum nominal
output using an electronic flue gas analyzer.
Adjustment to different flue systems using throttle discs or baffles is not
necessary.
▶ Switch the appliance OFF using the ON/OFF switch.
▶ Remove the cover ( Fig. 21).
▶ Switch the appliance ON using the ON/OFF switch.
▶ Unscrew a plug, indicated in the figure below, to open one of the flue
gas test ports.
Fig. 75 Open one of the flue gas test ports
▶ Insert the probe approximately 2¾ inches (70 mm) into the test port
and seal around it.
2.
1.
3.
6720813780-01.1Wo
NGLPG
6720813780-02.1Wo
6720810590-46.1Wo
6720810590-64.1Wo
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