Wolf CGS-2-14/120L Installation Instructions Manual page 18

CGS-2 gas condensing centre
Gas condensing boiler to EN 437/EN 13203-1/EN 15502-1/
EN 15502-2-1/EN 60335-1/EN 60335-2-102/EN 62233/EN
61000-3-2/EN 61000-3-3/EN 55014-1, as well as 92/42/
EEC (Efficiency Directive) / 2016/426/EU (Gas Appliances
Directive), 2014/30/EU (EMC Directive) / 2014/35//EU (Low
Voltage Directive) / 2009/125/EC (ErP Directive) / 2011/65/
EU (RoHS Directive) / Commission Delegated Regulation
(EU) No 811/2013 / Commission Delegated Regulation (EU)
No 813/2013, with electronic ignition and electronic flue gas
temperature monitoring, for low temperature heating and DHW
heating in heating systems with flow temperatures up to 90 °C
and 3 bar permissible operating pressure in accordance with
EN 12828. This Wolf gas condensing boiler is also approved
for installation in garages.
Gas condensing boilers operated with an open
flue may be installed only in rooms that comply
with the appropriate ventilation requirements.
Otherwise there is a risk of asphyxiation or poi-
soning. Read the installation and maintenance
instructions before installing the boiler. Also
take into consideration all technical information.
When operating the boiler with LPG use only
propane according to DIN 51 622, otherwise
faults may arise when starting and operating
the gas condensing boiler, which may lead to
damage to the appliance and personal injury.
A poorly vented LPG tank can lead to problems
with ignition. In such a case, contact the com-
pany that fills the LPG tank.
The adjustable cylinder water temperature can
exceed 60 °C. Short-term operation at tempera-
tures above 60 °C must be supervised in order
to prevent scalding. For permanent operation,
appropriate precautions should be taken to
prevent draw-off temperatures above 60 °C, e.g.
thermostatic valve.
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8. Standards and regulations
Fig.: Wolf gas condensing centre
To protect against scaling, the DHW temperature should be
set to max. 50 °C when the total water hardness is 15 °dH
(2.5 mol/m³) or above.
Under the Drinking Water Ordinance [Germany], this is
the lowest permissible value for DHW temperatures, as it
practically rules out the risk of legionella proliferation with
daily use of the hot water system (when a DHW cylinder
≤ 400 l is installed – water in the cylinder is fully replaced
within 3 days through usage).
With a total hardness of 20 °dH or higher, the use of a
water treatment facility in the cold water supply line when
heating DHW is necessary in order to extend the mainte-
nance intervals.
Even if water hardness is below 20 °dH, a higher risk of
scale build-up may occur locally, necessitating suitable
softening measures. Failure to take such measures will
result in premature scaling of the appliance and a reduc-
tion in the convenient availability of domestic hot water.
The contractor responsible should always check the local
conditions.
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