9
Operation 4
Instructions for use ecoMAX
Fig. B.12 To turn OFF the central heating only (Summer mode)
4.7.2 To turn OFF the domestic hot water operation
(ecoMAX 646 and 665 only)
ecoMAX 646 and 665 in combination with separate indi-
rect hot water cylinder provides the possibility to turn
OFF the domestic hot water operation whilst the heating
operation still remains in function.
• Turn the water temperature control knob all the way
to the very left — only the frost protection of the hot
water cylinder remains in function.
4.7.3 Complete shutdown
Fig. B.13 Complete shutdown
If you want to turn the ecoMAX boiler OFF for a longer
period of time (e.g. holidays), and there is no danger of
frost, then you should also turn off the gas supply, the
cold water service valve (see page 5) and the electrical
supply. Please note the frost protection hints detailed in
these instructions.
• Turn the main ON/OFF control (2) to the “0” position.
Note!
Do not turn the ecoMAX boiler OFF if a hot
water cylinder is also incorporated in the system
unless there is no demand for domestic hot
water.
4.8 Troubleshooting
In the unlikely event that a problem occurs with the ope-
ration of the ecoMAX boiler, the following points should
be checked:
Boiler fails to operate:
• Is the gas supply turned on? (see page 5)
• Is the water supply turned on? (see page 5)
• Is there enough water in the heating system?
(see page 5)
• Is the electrical supply switched ON?
• Is the main ON/OFF control in the “ON” position?
(switch position “I”)
• Is the burner lock out indicator light illuminated?
(see page 8)
Attention!
If your boiler still does not operate then please
consult your installer or Vaillant Service
Solutions (0870 6060 777).
4.9 Care and maintenance
Clean the outer casing of your boiler with a damp cloth
and a little soap. Do not use abrasive or solvent cleaning
agents that may damage the case or the plastic fittings.
The appliance should be serviced at least once per year.
To ensure regular servicing, it is strongly recommended
that arrangements are made with your service agent or
Vaillant Ltd. For further details please contact Vaillant
Service Solutions: (0870 6060 777).
4.10 Frost protection
Your boiler is equipped with a frost protection function:
If the heating water temperature drops below 5 °C when
the main switch is ON, then the boiler goes into operati-
on and heats the boiler circuit to approx. 30 °C.
Note!
It cannot be guaranteed that water will circulate
throughout the entire heating system.
If the boiler is not operated for several hours during
very cold weather there is therefore the possibility of
the system freezing.
Please ensure that if you are absent during a period of
frost the central heating remains in operation and all
rooms are kept above freezing point.
It must be remembered, however, that the boiler will be
automatically switched off by the built in monitoring
devices if certain faults occur, e.g. interruption in the gas
or electricity supply or faults in the flue gas system. To
overcome this possibility you can drain both the central
heating system and boiler.
Note!
Frost protection and monitoring devices can
only function when the main switch of the unit
is set to the “I” position and the boiler is
connected to the electrical supply.
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