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6.5 Start-up
1 Open the gas valve.
2 Switch on the appliance using the on/off switch on the con trol panel.
3 Select the function “automatic operation q” using the func tion selector. (See also the operat-
ing instructions on the boiler).
6.6 Shut-down
The appliance can be shut down in three different ways:
A The boiler continues to supply domestic hot water. Select the F function with the function
switch.
B The boiler is not operating and will only start up for auto matic frost protection. Select the i
function using the function selector.
C Shut down the boiler:
1 Switch off the boiler using the on/off switch on the con trol panel.
2 Close the gas valve.
6.7 Warnings
The appliance must be installed by a recognised installer. The operating instructions must be
strictly observed.
If the source of the fault cannot be found, the service organisa tion must be contacted. Never
repair the appliance yourself.
The condensate drain may never be modifi ed or closed off. When a boiler is completely shut down
in the winter period, there is a danger of freezing. Drain the water out with the aid of the fi lling/
drainage valve. The user must never make any modi cations to the appliance or the discharge
system.
Annual checking and good maintenance are necessary in order to guarantee optimum perform-
ance.
7 Commissioning
7.1 General
Commissioning must be carried out by skilled personnel. Fail ure to observe this condition will
invalidate the guarantee.
7.2 Commissioning
Water and the hydraulic system
Take a sample of the water from the fi lling/drainage valve on the boiler and a sample of the make-
up water. Determine the water hardness using the titration method. The water hardness must be
less than 250 ppm. If the measured hardness is too high, the water must be softened.
y
Determine the concentration of chloride in the system water. This may never exceed 200 mg/l. If
this concentration is ex ceeded, the system must be fl ushed through and re- lled with low chlo-
ride water.
Check the pressure of the system water. This must have at least the minimum value given in table
14 (Operating pres sures).
45


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