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installation
Hydraulic diagram MGm II basic
1
2
A
3
4
5
6
13
1 1
Legend
1. Manual air relieg valve
2. Hydrauli compensator
3. Zone 1 circulation pump
4. Thermostatic mixing valve
5. Zone 2 circulation pump
6. Boiler fl ow Zone 1
7. Boiler fl ow Zone 2
11. Zone 2 non-return valve
12. Return valve Zone 2
13. Zone 1 non-return valve
14. Return valve Zone 1
15. Boiler return valve
16. Boiler fl ow valve
WARNING
Before carrying out any work on the boiler, fi rst isolate it
from the electrical power supply using the external double
pole switch.
Electrical connections
For increased safety, the entire electrical system should be checked by
a qualifi ed electrical engineer.
The manufacturer may not be held responsible for any damage caused
by the lack of a suitable earthing system or by the malfunctioning of
the electricity mains supply. Ensure that the electrical system can
provide the maximum power required by the module (as shown
on the data plate). Make sure that the cross section of the wires is
suitable and is no less than 1.5 mm
For safety of operation, the equipment must be connected to an
effi cient earthing system.
The power supply cable must be connected to a 230V 50Hz network,
ensuring the correct connection of L-N and earth.
Important!
The connection to the mains must be permanent (not using a plug),
through a Dual Pole isolator switch, having a contact air gap of at least
3 mm when open. The module is fi tted with a power supply cable
without a plug.
46
16
15
B
AB
12
2
.
H05 V2V2-F
Hydraulic diagram MGm III basic
1
2
10
11
3
14
Legend
1. Automatic air relief valve
2. Hydraulic compensator
3. Dirt separator outlet
4. Zone 1 non-return valve
5. Zone 3 Circulation pump
6. Zone 2 Circulation pump
7. Zone 1 Circulation pump
8. Zone 2 thermostatic mixing valve assembly
9. Zone 3 thermostatic mixing valve assembly
A. Boiler fl ow inlet
B. Boiler return inlet
C. Zone 1 fl ow
D. Zone 1 return
E. Temperature-controlled Zone 2 fl ow
F. Temperature-controlled Zone 2 return
G. Temperature-controlled Zone 3 fl ow
H. Temperature-controlled Zone 3 return
For a low temperature fl oor installation, use safety thermostat refe-
rence 3318281 for underfl oor heating concerning Zone 2.
The electrical connection must be on terminal blocks ST2 of the mo-
dule.
Outdoor temperature sensor
An outdoor temperature sensor can be connected to the module's
"SE" terminal block. This can be used to display the outdoor tempe-
rature, or for temperature control if:
- the module is connected to the boiler via the BUS
connection (scenario no. 1),
- the SRA function is active.
In this scenario, the outdoor temperature sensor connected to the
module overrides the sensor that may be connected to the boiler.
A
B
9
A
B
AB
8
AB
7
6
5
4
12
13
14
15
16
17
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