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4.3.4
Block diagram 2
Cascaded thermal units with two-way valve for each thermal unit, system pump, and system and cascade sensors.
Management of a DHW circuit, of a direct zone and a mixed zone with electronic zone management device (ZM).
DEP. 2-8
DEP. 1
BUS
7
V1
V1
M
VLPG (*)
VLPG (*)
1
Isolating valve
2
Non-return valve
3
Pressure reducer
4
Water softener filter
5
Safety valve
6
Drain
7
INAIL kit
8
Expansion tank
9
Automatic bleed valve
10
Separator
11
Storage cylinder
EAF
Domestic cold water inlet
UAC
Domestic hot water outlet
V1
Thermal unit two-way valve
P1
Zone 1 pump (high temperature)
PB
DHW circulator
PR
DHW circulation pump (not managed)
PS
System circulation pump
SE
Outdoor sensor
SS
System sensor
(*)
An LPG fuel shut-off gas solenoid valve can be controlled instead of the DHW pump PB
9
Install thermal units of similar power to maximise the cascaded system's performance.
9
The DHW circuits and CH circuits must be provided with expansion tanks of adequate capacity and suitably sized safety valves.
The drain from the safety valves and appliances must be connected to a suitable collection and evacuation system (see cata-
logue for compatible accessories).
9
The choice of system components and the method of their installation are left up to the heating engineer installing the system.
Installers must use their expertise to ensure proper installation and functioning in conformity to all applicable legislation.
9
Special supply/refill water must be conditioned using suitable treatment systems.
0
It is prohibited to operate the thermal module without water.
SE
MANAGING
BUS
7
7
SS
V1
M
M
1
2
1
PS
8
VLPG (*)
1
1
ZM
9
2
V2
1
PB(*)
1
5
9
1
6
6
SC
10
1
8
1
EAF
6
1 3
4
SC
Secondary circuit sensor
SB/TB Heater probe/thermostat
S1
Zone 1 sensor
ZM
Zone management electronic device
P2
Zone 2 circulator (low temperature)
V2
Mixer valve zone 2
S2
Zone 2 sensor
TA
Room thermostat
OT
Open Therm Interface
CR
Remote control (accessory)
89
CONFIGURATION OF CASCADED THERMAL UNITS
TA/OT
P1 2 1
S1
9
TA
P2
2
1
S2
1
SB/TB
11
1
1
UAC
1
PR
2
1
6
5
6
1
8
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