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2.7.3 Decalcication
Formation of lime scale depends on the
quality and quantity of the water used.
In addition higher water temperatures
lead to more deposit in the appliance.
A temperature setting of 60° C is
recommended in order to keep the
calcication at a low level. Decalcication
should be attempted with the proper
means. For extensive information a
decalcication instruction is available.
2.7.4
Spare parts
To be able to order spare parts it is
important to note the type of appliance
as well as the serial number of the
appliance. Based on this information the
data concerning the spare parts can be
determined.
2.8
Inlet combination
Not applicable in U.K. and Ireland.
2.9 Gas smell
Immediately shut the main gas tap.
Do not light any re or switch o any lights,
do not use any electrical switches or
alarm bells. Open windows. Thoroughly
inspect all gas connections and, if the
gas smell persists, alert the local gas
company and/or your installer.
2.10 Condensation
If the appliance is lled with cold water
or if the hot water consumption is very
high, condensation of ue gasses
will occur on the cold surfaces of the
combustion chamber and the ue tube.
The water drops will fall on the burner and
cause a sizzling noise. This is a normal
phenomenon that will disappear as soon
as the appliance reaches its normal
operating temperature.
Important warning
The applicance should never be
taken into operation with a closed
cold water supply!
Provision should always be made for
expansion.
Unit BTI 85 BTI 100
G20 G30 G31 G20 G30 G31
Supply pressure mbar 20 30 37 20 30 37
Burner pressure mbar 12.0 30 37 7.9 30 37
Diameter main
injector
mm 3.90 2.30 2.30 4.50 2.35 2.35
Diameter pilot
injector
mm 0.56/
0.41
0.23 0.23 0.56/
0.41
0.23 0.23
20


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