37Installation and maintenance manual ecoTEC
• Finally, keep the “i” button pressed for about five sec-
onds, or until the display stops flashing. The value is
now saved to memory. The display will now return to
its normal state (current heating system flow tempera-
ture, e.g. 45 °C).
• Press the “i” and “+” buttons simultaneously to cancel
adjustment mode.
Adjustment mode is also cancelled if no button is
operated for a period of 4 minutes.
Appliance Heating output in kW
ecoTEC plus 612 4.9 – 12.0
ecoTEC plus 615 4.9 – 15.0
ecoTEC plus 618 6.7 – 18.0
ecoTEC plus 624 8.0 – 24.0
ecoTEC plus 630 10.0 – 30.0
ecoTEC plus 823 6.0 – 18.0
ecoTEC plus 831 8.7 – 24.0
ecoTEC pro 828 9.0 – 24.0
Table 5.2 Heating system part load adjustment ranges
5.12 Gas changeover
Note
To reset the appliance from natural gas to pro-
pane mode, you need the Vaillant changeover
set Art. No. xxx xxx.
To reset the appliance from propane gas to nat-
ural gas mode, you need the Vaillant changeo-
ver set Art. No. yyy yyy.
Reset the appliance as described in the change-
over set.
6 Functional checks (commissioning
part II)
6.1 Functional checks
6.1.1 Procedure
After installing and checking the gas supply pressure,
perform a function check before commissioning the
appliance and handing over to the user.
• Commission the appliance according to the relevant
operating manual.
• Check the gas supply pipe, exhaust system, heating
system and the hot water lines (only in 800 series
appliances) for leaks.
• Check that the flue system has been installed properly
according to the flue system assembly manual.
• Check for ignition and an even flame on the burner.
• Perform a function check on the heating system (see
Section 6.1.2) and the water heating (only in 800
series appliances, see Section 6.1.3).
• Hand over the appliance to the user (see Section 6.2).
Fig. 6.1 Function check
6.1.2 Heating
• Switch on the appliance.
• Make sure that there is a heat request.
• Press “i” to activate the status indicator.
As soon as a heat request is received, the appliance runs
through the status indicators “S. 1” to “S. 3”, until the
appliance is running correctly in normal mode and the
display shows “S. 4”.
plus pro
Fig. 6.2 Display indicator during heating mode
Commissioning Part I 5
Commissioning Part II 6
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