Block Diagram 4 - Riello TAU Unit 50 Installation And Maintenance Manual

4.3.9

Block diagram 4

Cascaded thermal units with two-way valve for each thermal unit, system pump, 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
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)
P2 Zone 2 pump (high temperature)
PB DHW circulator
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.
MANAGING SE
BUS
7 7
SS
V1
M M
1 2 1
PS
8
VLPG
1
1
1
ZM
9
2
V3
1
PB
1
5
9
1
6
SC 6
10
1
8
1
EAF
6
1 3 4
PR DHW circulation pump (not managed)
PS System circulation pump
SE Outdoor sensor
SS System sensor
SC Secondary circuit sensor
SB/TB Heater probe/thermostat
S1 Zone 1 sensor
S2 Zone 2 sensor
ZM Zone management electronic device
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)
101
CONFIGURATION OF CASCADED THERMAL UNITS
TA/OT
P1 2 1
S1
TA/OT
P2 2 1
S2
9
TA
P3
2 1 S3
1
SB/TB
11
1
1
1
UAC
1
PR
2
1
6
5
6
1 8