Vailant ecoTEC plus 937, Инструкция по установке и обслуживанию

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Installation and maintenance instructions ecoTEC plus 937 0020031552_06
Fill the lower section with water until about 10 mm
below the upper edge.
Re-fit the lower section to the condensate siphon.
8.4 Cleaning strainer in cold water supply
There is a strainer in the cold water supply to the combi
boiler which must be cleaned during maintenance.
Isolate the unit from the electric mains in the appart-
ment as described in 9.2.
Close the cold water stop valve on the inlet combina-
tion (see Fig. 8.11) and drain the unit from the hot
water side.
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2
3
Fig. 8.11 Cleaning strainer in cold water supply
Release the fitting ( 1 ) of the cold water inlet.
Release the fitting ( 3 ) on the connector ( 2 ).
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The fitting ( 3 ) is located above the connector
( 2 ) and is not shown in Fig. 8.11.
Remove the connector ( 2 ) from the chassis.
Flush the connector out under flowing water in the
opposite direction to normal flow.
Re-fit the connector with the cleaned strainer.
Fit the pipe elbows of the shift load storage tank and
the cold water feed back in position.
Always use new seals.
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8.5 Checking filling pressure of the expansion
vessel of the combination boiler
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This check need not be performed every year,
a check every three years is sufficient.
Turn the stop valvess of the central heating off.
Release the pressure from the appliance.
Remove the valve cover from the expansion vessel.
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Fig. 8.12 Checking filling pressure of the expansion vessel of
the combination boiler
Check that the internal pressure in the expansion
vessel is between 0.75 and 0.9 bar.If the pressure is
less than this, the vessel must be pumped up again
using an air pump.
Refit the valve cover.
Re-pressurise the combi boiler and the heating sys-
tem.
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8 Inspection and maintenance