![background image](/i/de-dietrich/91499/de-dietrich-zena-plus-msl-28-mi-ff/h/de-dietrich-zena-plus-msl-28-mi-ff-095.png)
95
71.03982.03 - EN
INSTALLATION INSTRUCTIONS
24
Key:
1
Automatic by-pass with check valve
2
Hydraulic pressure switch
3
Three-way valve
4
Three-way valve motor
5
Gas valve with gas diaphragm
6
Gas train with nozzles
7
NTC heating sensor
8
Ignition/lame detection electrode
9
Safety thermostat
10
Water-fumes exchanger
11
Fumes conveyor
12
Fumes thermostat
13
Burner
14
Expansion vessel
15
Pump and air separator
16
Non-return valve
17
Boiler drain tap
18
Pressure gauge
19
Safety valve
20
Disconnector
Figure 20
Heating low
Gas
DHW
inlet
Heating return
CG_2268 / 1006_2103
Storage
boiler
low