Setting The Pump Output; Remaining Feed Head Of The Pump; Setting The Bypass Valve; Handing The Product Over To The Operator - Vaillant ecoTEC exclusive 843 Installation And Maintenance Instructions Manual

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.
8.5

Remaining feed head of the pump

8.5.1 Pump characteristic line 835 (VUW 356/5-7)
A
400
350
300
250
200
53%
150
60%
100
50
0 200 400 600 800 1000
A Remaining feed head
[hPa (mbar)]
8.5.2 Pump characteristic line 843 (VUW 436/5-7)
A
400
350
300
250
200
53%
150
100
60%
50
0 200 400 600 800 1000
A Remaining feed head
[hPa (mbar)]
8.6

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 10)
0020193968_03 ecoTEC exclusive Installation and maintenance instructions
Adapting the unit to the heating installation 8
100%
80%
70%
1200 1400 1600 1800 B
B System volume flow [l/h]
100%
80%
70%
1200 1400 1600 1800 2000 B
B System volume flow [l/h]
1
▶
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)
5 further turns to
0.017
the left from the
(170)
mid-position
▶
Install the front casing.
8.7

Handing the product over to the operator

▶
When you have finished the installation, affix the en-
closed sticker (which requests that the user reads the
instructions) to the front of the product in the operator's
language.
▶
Explain to the operator how the safety devices work and
where they are located.
▶
Inform the operator how to handle the product.
▶
In particular, draw attention to the safety information
which the operator must follow.
▶
Inform the operator that they must have the product
maintained in accordance with the specified intervals.
▶
Pass all of the instructions and documentation for the
product to the operator for safe-keeping.
▶
Inform the operator about measures taken to ensure the
supply of combustion air and flue gas guiding, and in-
struct the operator that he must not make any changes.
▶
Inform the operator that they must not store or use ex-
plosive or highly flammable substances (such as petrol,
paper or paint) in the installation room of the product.
▶
Complete and sign off the Benchmark commissioning
check list.
▶
Complete and sign off the guarantee documentation.
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
If noises are produced in
the radiators or radiator
valves
25