Typical Water System Schematics And Configuration Of Cascaded Thermal Units; Block Diagram 1 - Riello TAU Unit 140 Installation And Maintenance Manual

4.3

Typical water system schematics and configuration of cascaded thermal units

4.3.1

Block diagram 1

Cascaded thermal units with single pump for each thermal unit and system and cascade sensors.
Management of a DHW circuit with two direct zones and a mixed zone, with electronic zone management device (ZM).
DEP. 2-8 DEP. 1
BUS
7
2
PC PC
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
PC Thermal unit circulation pump
PI System circulator (high temperature zone)
P2 Zone 2 pump (high temperature)
PB DHW circulator
PR DHW circulation pump (not managed)
(*) An LPG fuel shut-off gas solenoid valve can be controlled instead of the system pump PI
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
9
1
7 7
SS
2 2
PC
10
8
VLPG (*)
6
P2 2
1
1
PI (*)
1
ZM
V3
P3
1
2
PB
5
9
1
6
SC
6
1
8
1
EAF
1 3
4
SE Outdoor sensor
SS System sensor
SC Secondary circuit sensor
SB/TB Heater probe/thermostat
S2 Zone 2 sensor
ZM Electronic device for zone management (accessory)
P3 Zone 3 pump (low temperature)
V3 Mixer valve zone 3
S3 Zone 3 sensor
TA Room thermostat
OT Open Therm Interface
VLPG LPG fuel shut-off valve (*)
CR Remote control (accessory)
79
CONFIGURATION OF CASCADED THERMAL UNITS
TA/OT
1 S2
TA/OT
1
2
9
TA
2 1 S3
1 SB/TB
11
1
1
1
UAC
1
PR
2
1
6
5
6
1 8