Installation; Checking The Gas Meter; Gas And Water Connections - Vaillant ecoFIT pure 825 Installation And Maintenance Instructions Manual

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1. Tilt the electronics box forward.
2. Hold on to the side section so that it cannot fall and
unscrew both screws (1), one from the top and one
from the bottom.
3. Tilt the side section to the outside and move it down-
wards and out.
4.10.2 Installing the side section
▶
Refit the components in the reverse order.
5

Installation

Danger!
Risk of scalding and/or damage due to
incorrect installation leading to escaping
water.
Stresses in the supply line can cause leaks.
▶
Make sure there is no voltage in the sup-
ply lines when they are installed.
Caution.
Risk of material damage caused by
residues in the pipelines.
Welding remnants, sealing residues, dirt or
other residues in the pipelines may damage
the product.
▶
Flush the heating installation thoroughly
before installing the product.
0020230531_01 ecoFIT pure Installation and maintenance instructions
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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 11 kPa
(110 mbar).
Caution.
Risk of material damage caused by corro-
sion
Due to non-diffusion-tight plastic pipes in the
heating installation, air gets into the heating
water. Air in the heating water causes corro-
sion in the heat generator circuit and in the
product.
▶
If you use non-diffusion-tight plastic pipes
in the heating installation, ensure that no
air gets into the heat generator circuit.
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.
Note
Apply thermal insulation to the water pipes to the
boiler outlet and to the system.
Preliminary work
1. Check that the system volume and the volumetric capa-
city of the expansion vessel are compatible.
▽
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 cold water stop cock for the unit
–
A gas stopcock for the unit
–
A filling and draining device in the heating installa-
tion
Installation 5
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