Selecting The Domestic Hot Water Cylinder; Selecting A Low Loss Header; Requirements - Vaillant ecoTEC plus VU 446/5-5 (H-GB) Installation And Maintenance Instructions Manual

▶
In order to control the cylinder's post-heating, connect
a VR 10 temperature sensor or a thermostat to the plug
that is connected to the main PCB.
Wiring diagram (→ Page 50)
▶
Set diagnostics code D.026 to 1.
Overview of diagnostics codes (Applicability: VU 446/5-
5 (H-GB) OR VU 606/5-5 (H-GB)) (→ Page 42)
5.2

Selecting the domestic hot water cylinder

The product can control an optional domestic hot water cylin-
der (recommended option for products with an output below
50 kW).
▶
Use a low loss header for products that are connected to
a domestic hot water cylinder and have a domestic hot
water output requirement of over 50 kW, . (→ Page 15)
▶
Use the following components to connect the domestic
hot water cylinder:
Domestic hot water cylinder
VU 446/5-5 (H-GB)
VU 606/5-5 (H-GB)
5.3

Selecting a low loss header

The low loss header disconnects the heat generator hydraul-
ically from the heating system. This prevents feed head in-
teractions between the individual circulation pumps. Further-
more, the low loss header ensures that a sufficient minimum
volume of water continuously circulates through the heat
generator.
▶
Observe the information on treating heating water.
(→ Page 21)
▽
If you cannot guarantee the conditions for treating
the heating water, install an external plate heat ex-
changer to protect the product.
Low loss header
VU 446/5-5 (H-GB)
VU 606/5-5 (H-GB)
▶
Observe the instructions for the low loss header.
You do not require any electronic accessories when using
a low loss header. You can connect simple installations dir-
ectly inside the electronics box.
▶
Observe the wiring diagram.
Wiring diagram (→ Page 50)
0020261389_02 ecoTEC plus Installation and maintenance instructions
Cylinder Internal dia-
meter of the
connection
VIH R 300 20 mm
VIH R 500 25 mm
Heating system spread
10 K 15 K 20 K
WH 95 WH 40-2 WH 40-2
WH 160 WH 95 WH 40-2
5.4

Requirements

▶
Make sure that the existing gas meter is capable of
passing the rate of gas supply required. (→ Page 62)
▶
If the hydraulic circuit contains a pump other than the one
for the product, only start up the product if a sufficiently
dimensioned low loss header is installed between the
heat generator circuit and the heating circuit or the cylin-
der charging circuit.
Low loss header (→ Page 15)
▶
If the product's pump is the only circulation pump in the
hydraulic circuit, check whether the product's feed head
is sufficient for the installation. (→ Page 30)
▽
If this is not the case, use an appropriately designed
low loss header and circulation pump.
▶
Ensure that the installation has the following compon-
ents:
–
A gas stopcock for the unit
–
A filling/draining device in the heating installation
▶
With older installations in particular, install a magnetic
filter at the heating circuit return in order to protect the
product against dirt from the installation.
–
Ensure that there is sufficient dimensioning in order
to prevent it from blocking quickly and to prevent high
pressure losses.
5.4.1 Information on liquid gas operation
In the as-supplied condition, the product is preset for opera-
tion with the gas group indicated on the data plate.
Applicability: Except Great Britain
If you have a product that has been preset for operation with
natural gas, you must convert it to run on liquid gas. You will
need a conversion set for this. The conversion procedure
is described in the instructions supplied with the conversion
set.
5.4.2 Purging the liquid gas tank
If the liquid gas tank is not purged properly, this may result in
ignition problems.
▶
Ensure that the liquid gas tank has been purged properly
before installing the product.
▶
If required, contact the filler or the liquid gas supplier.
5.4.3 Using the correct gas type
Using the incorrect gas type may cause fault shutdowns in
the product. Ignition and combustion noise may occur in the
product.
▶
Only use the gas type listed on the data plate.
Installation 5
15