Configuration Of The Secondary System - Riello TAU Unit 50 Installation And Maintenance Manual

4.2

Configuration of the secondary system

Optimal use of the modules in cascade occurs by placing a hy-
draulic separator (available as an accessory) between the pri-
mary system (thermal modules in cascade for thermal genera-
tion) and the secondary system (users, such as heat distribution
systems, DHW production). This device allows a different flow
rate to be compensated between the primary and secondary
systems.
DEPENDING MANAGING
BUS
PC PC
The secondary system can be configured using the following accessories:
− Secondary circuit sensor (SC)
This is required in order to manage the setpoint, and therefore the required temperature, downstream of the hydraulic
separator.
The secondary circuit sensor must be connected to the controller of the first "Depending" unit.
− Hot water tank sensor/thermostat (SB/TB)
This is required in order to manage the production of DHW in combination with a hot water tank circulator (PB).
The hot water tank sensor/thermostat is connected to the controller of the "Managing" unit.
DEPENDING
BUS
PC
(*) DHW circulation pump (not managed)
TA/OT/SE/0-10V
SS
SC
HYDRAULIC SEPARATOR
SE/0-10V
MANAGING
SS
PC
CONFIGURATION OF CASCADED THERMAL UNITS
For the sake of simplicity, the hydraulic circuits downstream of
the separator can be identified as the secondary system.
The basic configuration of the secondary system takes place
using a system circulator (PI). This circulator, connected to the
modules in cascade, allows the transfer of the heat energy to a
user circuit to be controlled, for example, a direct zone for high
temperature heating of a room.
DEPENDING MANAGING
BUS
PC PC
PB
TA/OT
PI
SC
EAF
75
SE/0-10V
TA/OT
PI
SS
SC
EAF
SECONDARY
UAC
SB/TB (*)