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INSTALLATION
9
Before connecting the thermal module the protection plugs
must be removed from the delivery, return and condensate
drain pipes.
9
Before connecting the thermal module, it is necessary to
clean the system. This step is absolutely required when the
appliance replaces another one on pre-existing systems.
In order to carry out this cleaning activity, if the old generator is
still installed on the system, it is advisable to:
− add a de-scaling additive.
− Operate the system with the generator on for around 7
days.
− Discharge dirty system water and flush the system one or
more times with clean water.
2.7
Typical water system schematics
Block diagram 1: Circuit with thermal modules with their own circulator, connected in cascade.
SE
Depending
PC
P
SS
PC
Thermal module circulator
PB
Storage cylinder circulator
PR
DHW circulation pump
PI
System circulator (high temperature zone)
P2
Zone 2 circulator (low temperature)
P3
Zone 3 circulator (low temperature)
S2
Zone 2 sensor
S3
Zone 3 sensor
SB
Boiler sensor
SE
Outdoor sensor
SS
Primary sensor
If the system is very dirty, repeat the last procedure one more
time.
If the old generator is not present or available, use a pump to
circulate the water + additive through the system for about 10
days and perform a final washing as described in the previous
paragraph.
Once the cleaning has been completed, it is recommended to
add a suitable protective fluid to the system's water before in-
stalling the thermal module.
In order to clean the heat exchanger's built-in water system,
please contact Technical Assistance Service
R
0
Do not use incompatible liquid detergents, including acids
(for instance, chloridric acid and similar) in any concentra-
tion.
0
Do not subject the heat exchanger to cyclical pressure
changes because fatigue stress is very dangerous for the in-
tegrity of system components.
PB
PI
V2
P2
S2
ZM
M
SB
V3
P3
S3
M
EAF
EAF
V2
Mixer valve zone 2
V3
Mixer valve zone 3
ZM
Electronic device for zone management (accessory)
EAF
Domestic cold water inlet
UAC
Domestic hot water outlet
26
2.7.1
Electrical power connections Block
diagram 1
MANAGING CONNECTIONS
101 102 103 104 105 106 107 108 109 110 111 112
.
N
L
L
101 102 103 104 105 106 107 108 109 110 111 112
MO2
101 102 103 104 105 106 107 108 109 110 111 112
PB
PB Storage cylinder circulator
PI System circulator (high temperature zone)
DEPENDING CONNECTIONS
(only if the depending zone is connected)
MO2
UAC
P2 Zone pump 2
PR
V2 Zone Mix Valve 2 (116-117 close; 117-118 open)
ACCESSORY CONNECTIONS FOR ADDITIONAL ZONE
SAFETY
ROOM
FLOW
THERMOSTAT
THERMOSTAT
SENSOR
1
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
P3 Zone 3 circulator (low temperature) (12-13-14)
V3 Mixer valve zone 3 (9-10 closing; 10-11 opening)
2.7.2
Connecting sensors/room thermostats
Diagram 1
MANAGING CONNECTIONS
L
N
L
N
L
N
MO1
PI
TA Room thermostat
SB Boiler sensor
SS Primary probe
SE Outdoor sensor
DEPENDING CONNECTIONS
(only if the depending zone is connected)
113 114 115 116 117 118
CLOSE
OPEN
N
N
L
L
L
113 114 115 116 117 118
113 114 115 116 117 118
P2
V2
TA Zone Thermostat
S2 Zone 2 sensor
ACCESSORY CONNECTIONS FOR ADDITIONAL ZONE
MIX VALVE
PUMP
BUS
SAFETY
L
N
L
L
N L
N
THERMOSTAT
THERMOSTAT
1
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
V3
P3
V3
P3
TA Zone Thermostat
S3 Zone 3 sensor
27
INSTALLATION
1
2
3
4
5
6
7
8
9 10
11 12 13 14
1
2
3
4
5
6
7
8
9
10
11 12 13 14
1
2
3
4
5
6
7
8
9
10
11 12 13 14
TA
SB
SS
SE
23 24 25 26 27 28
23 24 25 26 27 28
M2D1
23 24 25 26 27 28
TA
S2
MIX VALVE
PUMP
ROOM
FLOW
BUS
SENSOR
L
N
L
L
N L
N
S3
TA
S3
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