Installation and maintenance instructions ecoTEC plus 0020031552_03
44
• Isolate the unit from the electric mains in the appart-
ment as described in 8.2.
• Close the cold water stop valve on the inlet combina-
tion (see Fig. 7.10) and drain the unit from the hot
water side.
• Release the fitting (
1
) of the cold water inlet.
• Release the fitting (
3
) on the connector (
2
).
h
Note
The fitting (3) is located above the elbow (2)
and is not shown in Fig. 7.10.
• 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.
7.5
Checking filling pressure of the expansion
vessel of the combination boiler
1
Fig. 7.11 Checking filling pressure of the expansion vessel of
the combination boiler
h
Note
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.
• Check that the internal pressure in the expansion ves-
sel 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 system.
7.6
Checking filling pressure of the expansion
vessel of the shift load storage tank
1
2
Fig. 7.12 Checking filling pressure of the expansion vessel of
the shift load storage tank
h
Note
This check need not be performed every year –
a check every three years is sufficient.
• Close the stop valves of the hot water system.
• Release the pressure from the appliance.
• Release the screw on the top cover of the shift load
storage tank and remove the cover.
The expansion vessel (
1
) is freely accessible
• Unscrew the seal cap (
2
) from the expansion vessel.
• Check that the internal pressure of the expansion ves-
sel is approx. 4 bar.
If the pressure is less than this, the vessel must be
pumped up again using an air pump.
• Screw the seal cap (
2
) back onto the expansion ves-
sel.
• Re-fit the cover.
• Re-pressurise the combi boiler and the hot water sys-
tem.
7.7
Re-commissioning the combination boiler
• Carry out the electrical safety tests.
• Switch on the electrical supply.
• Turn the stop valves of the central heating on.
• Carry out a function check of the combi boiler as de-
scribed earlier.
• Check the gas rate as described earlier.
• Check for water leaks.
• Re-fit the front case. Make sure that the seal is good.
7 Inspection and maintenance
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