Setting The Pump Output; Setting The Bypass - Vaillant home combi Installation And Maintenance Instructions Manual

8.1.2 Resetting the remaining burner anti-cycling
time
▶
Hold the button down for more than 3 seconds.
◁
is shown in the display.
8.2

Setting the pump output

Conditions: Modulating pump
The product is equipped with a speed-regulated high-effi-
ciency pump, which adjusts independently to the hydraulic
conditions of the heating installation.
If the heating installation is equipped with a low loss header,
switch off the speed control and set the pump output to a
fixed value.
▶
If required, use diagnostics code d.14 to adjust the set-
ting for the operating-mode-dependent pump speed.
▶
Set the diagnostics code. (→ Page 15)
Overview of diagnostics codes (→ Page 30)
Flow rate-pressure curves for 25 kW
(pressure measured downstream of the valves)
4
B
70
60
50
40
30
20
10
0 500
1 Maximum speed (by-
pass closed)
2 Maximum speed (de-
fault setting for the by-
pass)
3 Minimum speed (default
setting for the bypass)
Flow rate-pressure curves for 30 kW
(pressure measured downstream of the valves)
4
B
70
60
50
40
30
20
10
0 500
1 Maximum speed (by-
pass closed)
2 Maximum speed (de-
fault setting for the by-
pass)
0020224355_00 HOME Installation and maintenance instructions
Adapting the unit to the heating installation 8
1 2
3
1000 1500 A
4 Flow rate at maximum
output (ΔT = 20K)
A Throughput in circuit
(l/h)
B Available pressure
(kPa)
1 2 3
1000 1500 A
3 Minimum speed (default
setting for the bypass)
4 Flow rate at maximum
output (ΔT = 20K)
A Throughput in circuit
(l/h)
Flow rate-pressure curves for 35 kW
(pressure measured downstream of the valves)
4
B
70
60
50
40
30
20
10
0 500
1 Maximum speed (by-
pass closed)
2 Maximum speed (de-
fault setting for the by-
pass)
3 Minimum speed (default
setting for the bypass)
8.3

Setting the bypass

Conditions: Modulating pump
If the pump operating parameter d.14 is set to Auto (∆p
limit), the default setting must not be changed.
Caution.
Risk of material damage caused by incor-
rect setting of the high-efficiency pump
When the pressure at the bypass valve is
increased (turning clockwise), malfunctions
may occur if the pump output is set below
100%.
▶
In this case, set the pump output to
5 = 100% using diagnostics parameter
d.14.
1
▶
Regulate the pressure using the adjusting screw (1).
▶
Fit the front panel. (→ Page 10)
B Available pressure
(kPa)
1 2 3
1000 1500 A
4 Flow rate at maximum
output (ΔT = 20K)
A Throughput in circuit
(l/h)
B Available pressure
(kPa)
21