Setting The Pump Over-Run Time; Setting The Burner Anti-Cycling Time - Vaillant ecoMAX 646 Installation And Maintenance Manual

6.2

Setting the pump over-run time

The pump over-run time for the heating mode is set to
5 minutes (default). It can be varied within a range from
1 minute to 60 minutes or be in "continuous" mode.
In order to change the pump over-run time, proceed as
follows:
• Pull the front panel of the appliance outwards.
• Switch the appliance main switch to the "l" position.
• Press the "i" and "+" keys simultaneously and hold
down the "+" key until "d.1" appears in the display.
• Press the "i" key.
The current pump run-out time in minutes appears in
the display.
• By pressing the "+" or "-" keys you can now increase
or decrease the value.
To set the pump mode "continuous", do not enter a
number, rather select the symbol "--" with the "+" or
"-" key.
• Hold down the "i" key for about 5 seconds until the
display stops flashing.
The value is now saved.
• Quit the setting mode by pressing the "i" and "+"
keys simultaneously.
The standard display appears again in the display
(current heating supply temperature, e.g. 45 °C).
The setting mode is also quit if you do not touch a key
for 4 minutes.
6.3

Setting the burner anti-cycling time

In order to avoid frequent switching on and off of the
burner (energy loss), an electronic block preventing it
being switched on after switching off, for a pre-deter-
mined time. The burner anti-cycle time can be adjusted
to fit the characteristics of the heating system.
The burner anti-cycle time is only activated for the
heating mode. Hot water operation during a burner anti-
cycle time in progress does not affect the timer.
The maximum burner anti-cycle time can be set under
diagnosis point d.2 between 2 and 60 minutes (factory
setting: 20-minutes). The anti-cycle time effective in
each case is then automatically calculated from the
current set supply temperature and the set maximum
burner anti-cycle time.
The timer can be reset or deleted by pressing the appli-
ance on/off switch. The burner anti-cycle time remain-
ing in the heating mode after a control shutdown can
be viewed under diagnosis point d.67.
In order to change the lockout time, proceed as follows:
• Pull the front panel of the appliance outwards.
• Switch the appliance main switch to the "l" position.
• Press the "i" and "+" keys simultaneously and hold
down the "+" key until the diagnosis code "d.2"
appears in the display.
• Press the "i" key.
Installation and maintenance manual ecoMAX 646 / 0020020158_02
Adapting the appliance to the heating system 6
The symbol "=" now appears in the display and then
the current burner lockout time in minutes.
• By pressing the "+" or "-" keys you can now increase
or decrease the value in 1 minute increments.
The displayed value flashes during the setting proce-
dure.
• Hold down the "i" key for about 5 seconds until the
display stops flashing.
The value is now saved.
• Quit the setting mode by pressing the "i" and "+"
keys simultaneously.
The standard display appears again in the display
(current heating supply temperature, e.g. 45 °C).
The setting mode is also quit if you do not touch a key
for 4 minutes.
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