Vaillant ecoTEC plus VU 446/5-5 (H-GB) Installation And Maintenance Instructions Manual page 17

Note
In order to keep heat losses to a minimum, we
recommend that you provide heat insulation for
the water pipe spigots on the product's outlet and
on the installation.
▶
If you are using plastic pipes in the heating installation,
install a safety cut-out in the heating flow.
–
The safety cut-out is required to protect the heating
installation against temperature-related damage if a
fault occurs.
▶
Connect a control or a safety cut-out to the electronics.
(→ Page 20)
5.5.3.1 Connecting the heating flow and heating
return
B
A
1. Attach the nut to the connection in accordance with
steps (A) to (D).
0020261389_02 ecoTEC plus Installation and maintenance instructions
C D
4
3
2
1
2. Assemble the heating return connection as shown by
numbers (7) to (12).
3. Assemble the heating flow connection as shown by
numbers (1) to (6).
4. Insert the seals (14).
5. Install the stopcocks (13) at the heating flow and return
connection.
6. Connect the heating circuit to the connections for the
heating flow and return.
7. Install an expansion vessel in the heating return (11), as
close to the product as possible.
–
Ensure that the volumetric capacity of the expansion
vessel is sufficient for the system volume.
5.5.4 Connecting the drainage devices
Caution.
Risk of water flowing out below the
product
The water drains for the rainwater collecting
device and the dynamic air separation sys-
tem are not connected to the waste-water
outflow, but water may escape.
▶
Do not place any electrical units or objects
that may be damaged by water below the
product.
Installation 5
5
6
10
11
9
12
8
7
14
13
17