Setting The Maintenance Interval; Setting The Pump Output; Setting The Bypass Valve - Vaillant ECOTEC EXCLUSIVE 627 VU 256/5-7 Installation And Maintenance Instructions Manual

8.2.2 Resetting the remaining burner anti-cycling
time
Alternatives 1 / 2
1.
▶
Navigate to Menu → Reset anti-cycl. time.
◁
The current burner anti-cycling time appears in
the display.
▶
Press to reset the burner anti-cycling time.
Alternatives 2 / 2
1.
▶
Press the Fault clearance
8.3

Setting the maintenance interval

Navigate to Menu → Installer level → Diagnostics
1.
menu → D.084 Maintenance in and confirm by press-
ing .
2. Set the maintenance interval (operating hours) until the
next maintenance work is due and confirm by pressing
.
Number
Heat de-
of per-
mand
sons
1 ‑ 2
5.0 kW
2 ‑ 3
1 ‑ 2
10.0 kW
2 ‑ 3
2 ‑ 3
15.0 kW
3 ‑ 4
3 ‑ 4
20.0 kW
4 ‑ 5
3 ‑ 4
25.0 kW
4 ‑ 6
3 ‑ 4
> 27.0 kW
4 ‑ 6
8.4

Setting the pump output

Navigate to Menu → Installer level → Diagnostics
1.
menu → D.014 Pump speed target value and confirm
by pressing .
2. Set the required pump output.
Conditions: Low loss header installed
▶
Switch off the speed regulation and set the pump output
to a fixed value.
0020193966_01 ecoTEC exclusive Installation and maintenance instructions
Adapting the unit to the heating installation 8
button.
Guideline value for burner
operating hours until the
next inspection/maintenance
work is due for an average
operating time of one year
(dependent upon the system
type)
1050 h
1150 h
1500 h
1600 h
1800 h
1900 h
2600 h
2700 h
2800 h
2900 h
3000 h
3000 h
8.4.1 Remaining pump head
8.4.1.1 Pump characteristic line 627 (VU 256/5-7)
A
400
350
300
250
200
53%
150
100
60%
50
0 200 400 600 800 1000
A Remaining feed head
[hPa (mbar)]
8.5

Setting the bypass valve

Caution.
Risk of material damage caused by incor-
rect setting of the high-efficiency pump
If the pressure at the bypass valve is in-
creased (by turning it clockwise) and the
pump output is set to less than 100%, the
product may not operate correctly.
▶
In this case, set the pump output to
5 = 100% using diagnostics code D.014.
▶
Remove the front casing. (→ Page 11)
▶
Regulate the pressure using the adjusting screw (1).
Pres-
Position of the sure
adjusting screw in MPa
(mbar)
Right-hand stop
0.035
(turned all the
(350)
way down)
Mid-position
0.025
(5 turns to the
(250)
left)
100%
80%
70%
1200 1400 1600 1800 B
B System volume flow [l/h]
1
Notes/application
If the radiators do not heat
up sufficiently at the default
setting. In this case, you
must set the pump to the
maximum speed.
Default setting
25