Checking The Gas Meter; Gas And Water Connections; Connecting The Drain Line For The Expansion Relief Valve - Vaillant home combi Installation And Maintenance Instructions Manual

5.1

Checking the gas meter

▶
Make sure that the existing gas meter is capable of
passing the rate of gas supply required.
5.2

Gas and water connections

Caution.
Risk of damage caused by incorrect gas
connection installation.
Excess test pressure or operating pressure
may cause damage to the gas valve.
▶
Check the leak-tightness of the gas valve
using a maximum pressure of 1.1 kPa
(110 mbar).
Caution.
Risk of damage caused by corrosion.
If non-diffusion-tight plastic pipes are used in
the heating installation, this may cause air to
enter the heating water and corrosion of the
heat generation circuit and the boiler.
▶
If using non-diffusion-tight plastic pipes
in the heating installation, separate the
system by installing an external heat ex-
changer between the boiler and the heat-
ing installation.
Caution.
Risk of material damage due to heat trans-
fer during soldering.
▶
Do not solder the connection pieces if
the connection pieces are screwed to the
service valves.
Note
We recommend that you provide the water pipes
to the boiler outlet and to the system with thermal
insulation.
Preliminary work
1. Check that the system volume and the volumetric capa-
city of the expansion vessel are the same.
▽
If the volume of the expansion vessel is insufficient
for the system.
▶
Install an additional expansion vessel in the
heating return, as close to the product as pos-
sible.
▶
Install a non-return flap at the product's outlet
(heating flow).
2. Ensure that the system has the following components:
–
A stop cock in the cold water supply
–
A stop cock in the gas line
–
A filling and draining device in the heating installa-
tion
0020224355_00 HOME Installation and maintenance instructions
4
3
2
1
1 Heating flow connec-
tion, G3/4
2 Hot water connection,
G3/4
3 Gas connection, G1/2
1. Connect the water and gas connections in accordance
with the applicable standards.
2. Purge the gas line before start-up.
3. Check whether the connections (→ Page 20) are leak-
tight.
5.3 Connecting the drain line for the expansion
relief valve
1
▶
Ensure that the pipeline is visible.
▶
The pipe must have a continuous fall and be routed to a
position so that any discharge of water, possibly boiling,
or steam cannot create any danger to persons, damage
to property or external electrical components and wiring.
◁
The components must be set up in such a way that
you can see the water flowing out.
Installation 5
5
4 Connection for the cold
water supply line, G3/4
5 Heating return connec-
tion, G3/4
11