Thoroughly Flushing The Heating Installation ("Hot"); Adapting The Unit To The Heating Installation; Activating Diagnostics Codes; Adapting The Heating Settings - Vaillant ecoTEC plus VU 446/5-5 (H-GB) Installation And Maintenance Instructions Manual

7.12 Thoroughly flushing the heating installation
("hot")
Applicability: Great Britain
OR Ireland
1. Operate the appliance until the boiler and the heating
system are up to temperature.
2. Check the heating system for leaks.
3. Connect a hose to the drain valve located at the lowest
position of the heating system.
4. Shut off the boiler, open the drain valve and all purge
valves on the radiators and allow the water to flow out
of the heating system and the boiler quickly and fully.
5. Close the drain valve.
6. Fill the heating system again with water as de-
scribed in "Filling and purging the heating installation"
(→ Page 23).
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.
See the section on checking and preparing
the heating water. (→ Page 21)
8. Install the front casing. (→ Page 11)
8 Adapting the unit to the heating
installation
To reset the most important system parameters, call up the
Appliance config. menu item.
Menu → Installer level → Appliance config.
Or manually relaunch the installation assistant.
Menu → Installer level → Start inst. assistant
8.1

Activating diagnostics codes

The setting options for more complex installations can be
found in the diagnostics codes.
Menu → Installer level → Diagnostics menu
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.
▶
Press or to change the diagnostics code.
▶
Press (Select) to select the parameter to change.
▶
Press or to change the current setting.
▶
Confirm by pressing (OK).
0020261389_02 ecoTEC plus Installation and maintenance instructions

Adapting the unit to the heating installation 8

8.2

Adapting the heating settings

8.2.1 Setting the maximum heating output
The maximum heating output for the product is set to Auto
at the factory. If you want to set a fixed maximum heat out-
put, you can use diagnostics code D.000 to define a value
that corresponds to the product output in kW.
8.2.2 Setting the burner anti-cycling time
To prevent frequent switching on and off of the burner and
thus prevent energy losses, an electronic restart lockout
is activated for a specific period each time the burner is
switched off. You can adjust the burner anti-cycling time to
the conditions of the heating installation. The burner anti-
cycling time is only active for the heating mode. Switching on
domestic hot water mode during the burner anti-cycling time
has no effect. You can use diagnostics code D.002 to set the
maximum burner anti-cycling time (factory setting: 20 min.).
The effective burner anti-cycling times with respect to the
target flow temperature and the maximum set burner anti-
cycling time can be found in the following table:
T (target)
Flow
℃
30
35
40
45
50
55
60
65
70
75
T (target)
Flow
℃
30
35
40
45
50
55
60
65
70
75
Set maximum burner anti-cycling time
min
1 5 10
2.0 4.0 8.5 12.5
2.0 4.0 7.5 11.0
2.0 3.5 6.5 10.0
2.0 3.0 6.0
2.0 3.0 5.0
2.0 2.5 4.5
2.0 2.0 3.5
2.0 1.5 2.5
2.0 1.5 2.0
2.0 1.0 1.0
Set maximum burner anti-cycling time
min
35 40 45
29.0 33.0 37.0
25.5 29.5 33.0
22.5 26.0 29.0
19.5 22.5 25.0
16.5 18.5 21.0
13.5 15.0 17.0
10.5 11.5 13.0
7.0 8.0 9.0
4.0 4.5 5.0
1.0 1.0 1.0
Note
The remaining burner anti-cycling time following a
regular shutdown in heating mode can be called
up under diagnostics code D.067.
15 20 25 30
16.5 20.5 25.0
15.0 18.5 22.0
13.0 16.5 19.5
8.5 11.5 14.0 17.0
7.5 9.5 12.0 14.0
6.0 8.0 10.0 11.5
5.0 6.0 7.5 9.0
3.5 4.5 5.5 6.5
2.5 2.5 3.0 3.5
1.0 1.0 1.0 1.0
50 55 60
41.0 45.0 49.5
36.5 40.5 44.0
32.0 35.5 38.5
27.5 30.5 33.0
23.5 25.5 28.0
19.0 20.5 22.5
14.5 15.5 17.0
10.0 11.0 11.5
5.5 6.0 6.5
1.0 1.0 1.0
29