CAUTION
4
The heating pipe must be mounted in accordance
with prevailing provisions.
4
Carry out any soldering work required at a safe
distance from the boiler or before the boiler is fitted.
4
If you are installing a service shut-off valve, place the
filling and drain cock, the expansion vessel and the
thermomanometer between the shut-off valve and
the boiler.
4
Install a drain under the safety valve leading to the
drainage system
ê
.
5.5.4.
Connection of the water circuit for
domestic use
1. Connect the cold water inlet pipe to the domestic cold water
connection
k
.
2. Connect the domestic hot water outlet pipe to the domestic hot
water connection
m
.
CAUTION
4
The domestic water pipes must be connected in
accordance with prevailing provisions.
4
Carry out any soldering work required at a safe
distance from the boiler or before the boiler is fitted.
4
If using synthetic pipes, follow the manufacturer’s
(connection) instructions.
5.5.5.
Connecting the expansion vessel
The boiler is fitted as standard with an 8-litre expansion vessel.
If the water volume is greater than 100 litres or the static height of the
system exceeds 5 metres, an additional expansion vessel must be
fitted. Refer to the table below to determine the expansion vessel
required for the installation.
Conditions of validity of the table:
4
3-bar safety valve
4
Average water temperature: 70 °C
Flow temperature: 80 °C
Return temperature: 60 °C
4
The filling pressure in the system is lower than or equal to the initial
pressure in the expansion vessel
Initial pressure of the
expansion vessel
Volume of the expansion vessel depending on the volume of the installation (in litres)
100
125
150
175
200
250
300
> 300
0.5 bar
4.8
6.0
7.2
8.4
9.6
12.0
14.4
Volume of the installation x 0.048
1 bar
8.0
(1)
10.0
12.0
14.0
16.0
20.0
24.0
Volume of the installation x 0.080
1.5 bar
13.3
16.6
20.0
23.3
26.6
33.3
39.9
Volume of the installationx 0.133
(1) Factory configuration
R000738-A
1
2
Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24
5. Installation
02092014 - 7619497-02
25
