36
Installation and maintenance manual ecoTEC
Natural gas:
DO NOT proceed with adjustment or attempt to
put the unit into service if the inlet working
pressure lies outside the 17–25 mbar range.
LPG:
DO NOT proceed with adjustment or attempt to
put the unit into service if the inlet working
pressure is lower than 37 mbar.
• Turn off the appliance, remove U gauge.
• Tighten the test point screw and check for leaks.
• Record appliance working gas inlet pressure (mbar) in
the Benchmark Installation, Commissioning and
Service Log Book.
5.9.3 Checking the gas rate
The boiler is fitted with a fully modulating automatic gas
valve which ensures that the precise air/gas ratio is pro-
vided under all operating conditions.
The gas rate has been set during production and does
not require adjustment.
The gas rate of the boiler should be checked with the
front case fitted as follows:
• Activate full gas rate mode by simultaneously pressing
the “
+
” and “
–
” buttons on the display system (ecoTEC
800, fully open the hot water tap to maximum water
flow rate).
• Wait at least 5 minutes, or until the boiler has reached
its operating temperature.
• With all other gas appliances turned off measure the
gas rate at the gas meter. Check that the gas rate is as
stated in Table 5.1.
Appliance
Maximum
net heat
input in kW
Nominal gas rate
(Tolerance
±
5 %)
Natural gas
in m
3
/h
Propane
in kg/h
ecoTEC plus 612
12.2
1.3
0.95
ecoTEC plus 615
15.3
1.6
1.19
ecoTEC plus 618
18.4
1.9
1.43
ecoTEC plus 624
24.5
2.6
1.90
ecoTEC plus 630
30.6
3.2
2.38
ecoTEC plus 823
23.5
2.5
1.82
ecoTEC plus 831
31.6
3.3
2.46
ecoTEC pro 828
28.6
3.0
2.22
Table 5.1 Nominal gas rates
Caution!
If the measured gas flow volume lies outside
the tolerance limits specified in Table 5.1, do not
operate the appliance and inform the Vaillant
Customer Service.
5.10 Refitting the case
Note
Ensure that the front panel retaining cords are
positioned such that they will not become
trapped in the casing.
1
2
Fig. 5.14 Erecting the housing
• Hook the top of the front casing over the lip on the
top of the boiler chassis and push the bottom of the
front casing into place.
• Ensure the spring retaining clips (
2
) engage correctly.
• Tighten case securing screw (
1
).
5.11
Adjusting the central heating output (range
rating)
The boilers are fully modulating for central heating, and
it is therefore not necessary to range rate the boiler.
However, if desired, it is possible to range rate the boiler,
as follows:
• Press the “
i
” and “
+
” buttons simultaneously.
• Keep the “
+
” button pressed until “
d.0
” is displayed.
Note
The display runs from “d.0” to “d.99” before
restarting at “d.0”.
• Press the “
i
” button. The “
=
” symbol is displayed. The
part load setting is now displayed in kW.
• Use the “
+
” and “
–
” buttons to increase or decrease
the value in steps of 1 kW. The displayed value will
flash while the adjustment procedure is being carried
out. The available ranges of settings are given in Table
5.2.
5 Commissioning Part I
