Adapting The Unit To The Heating Installation - Vaillant ecoTEC plus 806 VU GB 806/5-5 Installation And Maintenance Instructions Manual

6. Fill the heating system again with water as de-
scribed in "Filling and purging the heating installation"
(→ Page 20).
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 side section. (→ Page 11)
9. Install the front casing. (→ Page 10)
8 Adapting the unit to the heating
installation
To reset the most important system parameters, use the
Appliance config. menu point.
Menu → Installer level Appliance config.
Or manually relaunch the installation assistant.
Menu → Installer level → Start inst. assistant
8.1 Calling up diagnostics codes
The settings options for more complex systems can be found
in the Diagnostics menu.
Menu → Installer level Diagnostics menu
Overview of diagnostics codes (→ Page 38)
Using the parameters that are marked as adjustable in the
overview of diagnostics codes, you can adapt the product to
the heating installation and the needs of the customer.
▶
Press or to change the diagnostics code.
▶
Press (Select) to select the parameter to change.
▶
Press or to change the current setting.
▶
Press (OK) to confirm your selection.
0020134823_04 ecoTEC plus Installation and maintenance instructions

Adapting the unit to the heating installation 8

8.2 Setting the heating partial load
The heating partial load of the product is set to Auto at the
factory. If you still want to set a fixed maximum heating par-
tial load, you can set a value under D.000, which equates to
the product output in kW.
If the product is operated in cascade, you must raise the
fan speed of the unit partial load to 1500 rpm (D.050) when
operating it with Natural gas and you must never raise the
speed under D.050 any higher when operating it with Liquid
gas because a higher speed is already being used.
If a domestic hot water cylinder (cylinder type VIH) is in-
stalled, you can adjust the partial load setting for the cylinder
charging to the cylinder type (D.077).
8.3 Setting the pump overrun and pump
operating mode
You can set the pump overrun under D.001 (default setting:
5 min.).
You can set the pump operating modes Eco or Comfort
under D.018.
In Comfort mode, the internal pump is switched on when the
heating flow temperature is not at Heating off ( Operating
instructions) and the heating requirement is enabled via an
external controller.
Eco (default setting) is useful for removing residual heat
after hot water generation when the heat demand is ex-
tremely low and large target temperature spreads exist
between the hot water generation and heating mode target
values. This prevents living rooms from being under-
supplied. If there is a heat demand, the pump is switched
on every 25 minutes for 5 minutes once the overrun time
has elapsed. When operating in cascade with a low loss
header or system separation, Vaillant recommends the Eco
operating mode.
If a system separation is installed, you must set the pump to
continuous mode (85%) (set diagnostics code D.014 to 4).
8.4 Setting the maximum flow temperature
You can set the maximum flow temperature for the heating
mode under D.071 (default setting: 75 °C).
8.5 Setting the return flow temperature control
If the product is connected to an underfloor heating system,
the temperature control can be changed from flow temperat-
ure control (default setting) to return flow temperature control
under D.017. If you have activated the return flow temper-
ature control under D.017, the automatic heating output de-
termination function is not active. If you set D.000 to Auto
anyway, the product operates with the maximum possible
heating partial load.
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