Converting The Appliance To Different Gas Types; Gas-Type Conversion; Setting The Gas-Air Ratio (Co 2 Or O 2 ) - Bosch ZSB 30-2 Installation And Servicing Instructions

50 | Converting the appliance to different gas types

12 Converting the appliance to different gas types
The gas-air ratio must always be set on the basis of a
CO or O reading taken at maximum rated heat output
2 2
and minimum rated heat output using an electronic
tester.
Adjustment to different flue systems using throttle discs
or baffle plates is not necessary.
NG
• Appliances for natural gas are factory-set to Wobbe
3
index 50 MJ/m and 11.3 mbar (1.13 kPa) supply
pressure and sealed.
LPG
• Appliances for LPG are factory-set to to Wobbe index
3
76.9 MJ/m and 27.5 (2.75 kPa) supply pressure and
sealed.
1)
LPG type
Commercial Propane
Commercial Butane
General Product
Universal LPG (U-LPG)
Table 18
1) according to NZS 5435
WARNING: Flue gas poisoning
When undefined gas mixtures (General
Product and Universal LPG) are used,
adjustment of gas values can lead to
dangerous levels of carbon monoxide
production.
B For any adjustment of the gas type use
only Commercial Propane and
Commercial Butane.
Commercial Propane can be used at any outside
temperature.
Commercial Butane can only be used when the outside
temperature is more than +5 °C.
We do not recommend the use of General Product and
U-LPG. The mixture of propane and butane in General
Product and U-LPG can vary depending on the amount of
fuel in the tank and the production process, which
makes precise adjustment of the gas values impossible.
6 720 644 143 (2010/09)
Use
recommended
permitted
permitted
permitted

12.1 Gas-type conversion

The following gas type conversion sets are available:
Appliance Conversion to
Z... 30-2 A LPG
NG
Z... 37-2 A LPG
NG
Table 19
12.2 Setting the gas-air ratio (CO
B Switch appliance off at the main switch.
B Remove the outer casing (
B Switch appliance on at the main switch.
B Remove sealing plug from flue gas testing point.
B Insert a flue gas probe approx. 135 mm into the
testing point socket and seal the testing point.
Fig. 48
B Press and hold the cnetral heating boost button
until it lights up.
The display shows the flow temperature alternating
with = maximum set heating output.
B Briefly press the central heating boost button
The display shows the flow temperature in alternation
with = maximum rated output.
B Measure the CO or O
2
Order No.
8 737 702 124 0
8 737 702 125 0
8 737 702 122 0
8 737 702 123 0
or O
2
page 28).
6 720 612 688-32.1O
level.
2
)
2
.