Vaillant ecoTEC plus VU Series Installation And Maintenance Instructions Manual - page 22
7 Adapting the unit to the heating installation
22
Installation and maintenance instructions ecoTEC plus 0020029173_04
7.
Re-fill the system until the system design pressure of
0,1 MPa (1,0 bar) is attained.
Note
The actual reading on the digital pressure
gauge should ideally be 0,05 MPa (0,5 bar)
plus an additional pressure corresponding
to the highest point of the system above the
base of the boiler – 10 m head equals an ad-
ditional 1 bar reading on the pressure gauge.
The minimum pressure should not be less
than 0,1 MPa (1 bar) in any installation. If
the system is to be treated with an inhibitor it
should be applied at this stage in accordance
with the manufacturer’s instructions. Further
information can be obtained from Sentinel,
Betz Dearborn Ltd., Tel: 0151 420 9595, or
Fernox, Alpha– Fry technologies. Tel: 0870
8700362.
8.
Install the front casing. (→ Page 11)
7
Adapting the unit to the heating
installation
7.1
Calling up diagnostics codes
You can use the parameters that are marked as adjustable
in the overview of diagnostics codes to adapt the product to
the heating installation and the needs of the customer.
Overview of diagnostics codes (→ Page 30)
+
▶
Press
and
below the display at the same time.
◁
The display shows D.0 (heating partial load).
▶
Press
.
◁
The display shows the associated diagnostics inform-
ation.
▶
If required, use
or
to change the value (the display
flashes).
▶
Save the new value by pressing and holding
for ap-
prox. five seconds until the display no longer flashes.
+
▶
Exit Diagnostics mode by pressing
and
at the
same time or by not pressing any button for four minutes.
◁
The current heating flow temperature appears in the
display.
Note
If you activate the installer level (second dia-
gnostics level), all of the diagnostics codes are
visible and accessible.
7.2
Calling up the installer level (second
diagnostics level)
▶
In the first diagnostics level, scroll to D.97.
▶
Change the displayed value to 17 (password).
▶
Save the setting.
7.3
Setting the heating partial load
The product's heating partial load is set to 46 kW at the fact-
ory. You can specify a value that corresponds to the product
output in kW under diagnostics code D. 0.
7.4
Setting the pump overrun and pump
operating mode
You can set the pump overrun under D.1 (default setting: 5
min.).
You can set the overrun behaviour of the pump to a different
mode under D.18.
Overrun: After ending the heating demand, the pump over-
runs the time that is set under D.1.
Continuous: The pump is switched on if the rotary knob for
setting the heating flow temperature is not at the left-hand
stop and the heat requirement is enabled by an external con-
troller.
Intermittent: This pump operating mode is useful for remov-
ing residual heat after charging when the heat demand is ex-
tremely low and large temperature differences exist between