Obtaining Hot Water; Heating Operation; Setting The Maximum Radiator Temperature Control; Setting The External Controls - Vaillant ecoMAX Instructions For Use Manual

4.3.1 Obtaining hot water

On opening a hot water tap (1) at a supply point (basin,
shower, bath, etc.) the incorporated hot water cylinder
delivers hot water. When the temperature inside the hot
water cylinder falls below the set value, the boiler will
start to re-heat the external hot water cylinder. When
the set temperature will be reached, the boiler will stop
whilst the pump and fan will continue to operate for a
short period.
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Fig. B.6 Obtaining hot water

4.4 Heating operation

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Fig. B.8 Setting the maximum radiator temperature control
The boiler should only be used when the heating system
contains water. Use of the boiler without water may
cause damage to the boiler or its components.
4.4.1 Setting the maximum radiator temperature
control
• Turn the main switch (1) to the "l" position.
• Set the maximum radiator temperature control to the
desired setting using the control knob (2).
We recommend the following settings:
- Left setting during spring and autumn,
- Middle setting during mild winter,
- Right setting during cold winter.
Instructions for use ecoMAX
When the temperature is adjusted, the boiler display will
show the corresponding water temperature. This infor-
mation appears on the display for about 5 seconds and
then the display returns to its normal state (current hea-
ting flow temperature e.g. 45 °C).

4.4.2 Setting the external controls

Fig. B.9 Setting the external controls
• Set the room thermostat and/or the thermostatic
The boiler will now operate automatically to provide cen-
tral heating for the conditions selected on the external
controls.
Whilst the boiler is operating, the boiler display indicates
the temperature of the water within the boiler circuit.
After the boiler stops operating the pump and fan will
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continue to operate for a short period to fully disperse
the heat from the boiler.
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radiator valves according to the instructions supplied
with the control(s).
Note!
Vaillant offer room thermostat/time control
accessories which give accurate and economic
room temperature control as well as improved
comfort.
Ask your installer!
Note!
The boiler incorporates an anti-cycling economi-
ser control to prevent energy wasteful ON and
OFF operation of the boiler for short periods
when in the central heating mode. When turning
the room thermostat to a higher setting there
may therefore be a short delay before the boiler
operates.
Operation 4
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