Gas Adjustment; Converting To A Different Gas Type; Installation Location Higher Than 2,000 Feet (610 M) Above Sea Level - Bosch Greenstar Series Installation And Service Instructions For Contractors

Gas adjustment

12 Gas adjustment
DANGER
Personal injury and property damage
▶ This conversion shall only be performed by a trained and certified
installer in accordance with the manufacturer's instructions and all
applicable codes and requirements of the authority having
jurisdiction.
▶ If the information in these instructions is not followed exactly, or the
installation, adjustment, modification, operation or maintenance is
carried out by an unqualified person, a fire, explosion or generation
of large amounts of carbon monoxide may result causing property
damage, personal injury or loss of life.
▶ Always disconnect the appliance from the mains power before
performing any work. Always disconnect the appliance from the
mains power before performing any work. Take measures to prevent
accidental reconnection.
▶ The installer is responsible for the proper conversion of this
appliance.
▶ The conversion is not complete until the operation of the converted
appliance is checked as specified in these instructions.
Adjustment to different flue systems using throttle discs or baffles is not
necessary.
NG
• The appliances are set at the factory to a Wobbe index of 1.333 BTU/
3 3
ft (49.6 MJ/m ) at 60 °F (approx. 15 °C), a gas supply pressure of
30" HG and 7.0" W.C. (17.4 mbar), and then sealed.
12.1

Converting to a different gas type

WARNING
Risk of fatal injury from explosion!
Escaping gas can cause an explosion.
▶ Allow only a licensed contractor to work on parts that carry gas.
▶ Close the gas shut-off valve before working on parts that carry gas.
▶ Replace used seals with new seals.
▶ After completing the work on parts that carry gas, carry out a leak
test.
A gas conversion kit with instructions for gas conversion is included in
the scope of delivery.
▶ Follow the instructions from the conversion kit.
With the gas conversion kit there is no setting of the gasair ratio (CO
O ) necessary.
2
62
12.2 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.
ZBR 42-3A... and ZWB 42-3A... appliances are derated at 3% per
1000 feet (305 m).
ZBR 21-3A..., ZBR 28-3A..., ZBR 35-3A..., ZWB 28-3A... and ZWB 35-
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 wall mounted gas condensing 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).
12.3 Checking and setting the gas-air ratio (CO
required
▶ Switch the appliance OFF using the ON/OFF switch.
▶ Remove the cover ( page 33).
▶ Switch the appliance ON using the ON/OFF switch.
▶ Open one of the flue gas test ports.
or
2
Fig. 76 Open one of the flue gas test ports
▶ Insert the probe approx. 2-3/4 inches (70 mm) into the test port and
seal around it.
▶ Press and hold the emissions test button
The supply temperature alternates on the display with
maximum set output in heating mode.
▶ Briefly press the emissions test button
The supply temperature alternates on the display with
maximum nominal output.
or O ), if
2 2
6 720 641 933-79.1O
until it lights up.
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Greenstar – 6721822579 (2021/01)