5 Installation
12
Installation and maintenance instructions ecoTEC plus 0020134823_04
▶
Remove the residues from the gas line by blowing
through the gas line beforehand.
▶
Make sure that the existing gas meter is capable of
passing the rate of gas supply required.
▶
Install an approved gas isolator cock on the product us-
ing the gas connection piece.
▶
Install the gas line on the gas isolator cock without ten-
sion.
▶
Purge the gas line before start-up.
▶
Check that the gas connection is leak-tight (
→
Page 24).
5.2
Hydraulics installation
Caution.
Risk of material damage due to high tem-
peratures.
Plastic pipes in the heating installation may
become damaged by overheating if a fault
occurs.
▶
When using plastic pipes, install a max-
imum thermostat on the heating flow.
Caution.
Risk of material damage due to corrosion.
If non-diffusion-tight plastic pipes are used in
the heating installation, this may cause air to
enter the heating water and lead to corrosion
of the heat generation circuit and the product.
▶
If using non-diffusion-tight plastic pipes
in the heating installation, separate the
system by installing an external heat ex-
changer between the product and the
heating installation.
Caution.
Risk of material damage due to heat trans-
fer during soldering.
▶
Only solder connection pieces if the con-
nection pieces are not yet screwed to the
service valves.
The product should be connected using a Vaillant pump
group (accessories).
–
Modulating pump
This pump group has a connection option for an expansion
vessel (right-hand connection) and an expansion relief valve
(left-hand connection). You can find information about avail-
able accessories from the Vaillant price list or from the con-
tact address provided on the reverse of this document.
▶
When installing the pump group, observe the installa-
tion sequence for the insulation and the hydraulic pipes (
Pump group installation instructions).
▶
Note that the boiler pump must always be fitted in the
return line. Otherwise, this may lead to a malfunction in
the product.
When connecting several products in cascade operation, you
must install a non-return flap from the cascade connection
set in the flow line of each individual product.
A non-return flap from a third-party manufacturer must have
no more than 30 mbar pressure loss for a volume flow of
4.5 m
³
/h.
5.2.1
Connecting the heating flow and heating
return
1
1.
In each case, insert a flat seal into the service valve
(Vaillant accessories).
2.
Screw the service valves onto the flow and return con-
nection
(1)
of the pump group.
3.
Screw the service valves to the customer's installation.
–
Diameter of the heating line: 1 1/4
″
