50 | Converting the appliance to different gas types
6 720 644 143 (2010/09)
12 Converting the appliance to different gas types
The gas-air ratio must always be set on the basis of a
CO
2
or O
2
reading taken at maximum rated heat output
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
index 50 MJ/m
3
and 11.3 mbar (1.13 kPa) supply
pressure and sealed.
LPG
• Appliances for LPG are factory-set to to Wobbe index
76.9 MJ/m
3
and 27.5 (2.75 kPa) supply pressure and
sealed.
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.
12.1 Gas-type conversion
The following gas type conversion sets are available:
12.2 Setting the gas-air ratio (CO
2
or O
2
)
B Switch appliance off at the main switch.
B Remove the outer casing (Æ page 28).
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
2
or O
2
level.
LPG type
1)
1) according to NZS 5435
Use
Commercial Propane recommended
Commercial Butane permitted
General Product permitted
Universal LPG (U-LPG) permitted
Table 18
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.
Appliance Conversion to Order No.
Z... 30-2 A LPG 8 737 702 124 0
NG
8 737 702 125 0
Z... 37-2 A LPG 8 737 702 122 0
NG
8 737 702 123 0
Table 19
6 720 612 688-32.1O
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