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CONFIGURATION OF CASCADED THERMAL UNITS
4 CONFIGURATION OF CASCADED THERMAL UNITS
9
The DHW and heating circuits must be completed with ex-
pansion vessels of a suitable capacity and correctly sized
relief valves. The discharge of the relief valves and the ap-
pliances must be connected to an evacuation and collection
system (see paragraph Neutralising the condensate).
9
The installer is responsible for selecting and installing the
system components and must work in full compliance with
correct technical regulations and legislation in force.
9
Special supply/refill water must be conditioned using suita-
ble treatment systems.
9
For the electrical connections, use H05-VV-F power cables
with a minimum cross-section of 1.5 mm
terminal ferrules. For the low voltage connections, use H05-
VV-F power cables with a minimum cross-section of be-
tween 0.5 and 1 mm
, complete with terminal ferrules.
2
9
When connecting the devices connected to the power
terminal board (pumps, circulators and diverting/mixing
valves) position relays in between unless the maximum
consumption of all components connected to the board (in-
cluding the thermal unit pump) is less than or equal to 1.5
A. The choice and size of these relays lies with the installer
depending on the type of device connected.
0
It is prohibited to operate the thermal module without wa-
ter.
4.1
Configuration of the primary system
The basic cascade configuration consists of at least two thermal
units. One is assigned the "Managing" role and the others are
assigned the "Depending" role.
9
The cascade of thermal units can be seen as the prima-
ry system of a heat generation system. This configuration
could be ideal to replace one or more larger generators in
an existing system if system reliability and efficiency is to be
increased.
In order for cascade operation to be possible, the "Managing"
thermal module must be connected to the primary sensor (SS)
at least, available as an accessory.
The primary sensor is required in order to manage the cascade
setpoint and is essential for managing the thermal modules as
a single generator.
, complete with
2
9
The installation of thermal units of similar power is recom-
mended in order to maximise the cascaded system's per-
formance.
9
Check that the parameter "Cascade mode" is set at "BASIC"
on each thermal unit
Operation of the primary system can be:
− Mode 0
Operating with room thermostat/heat request and fixed
central heating setpoint.
− Mode 1
Operating in climatic mode with room thermostat/heat
request, variable setpoint depending on the outdoor
temperature.
− Mode 2 - Not recommended.
Operating in climatic mode with decrease (attenuation)
controlled by room thermostat/heat request, variable
setpoint depending on the outdoor temperature.
− Mode 3 - Not recommended.
Continuous operation with fixed setpoint with decrease
(attenuation) controlled by room thermostat/heat
request.
− Mode 4
Adjusting the setpoint based on a 0-10V analogue input.
− Mode 5 - Not applicable
The functions described can be set using the parameterisation
carried out on the "Managing" thermal unit.
The electrical and hydraulic connections of the primary system
are to be completed selecting from:
− Use of the thermal unit pump available as an accessory
for all models TAU Unit.
− Use of the system circulator (PS) and two-way valves (V1)
for each thermal module (these devices are available as
accessories).
76
TA/OT/SE/0-10V
DEPENDING
MANAGING
BUS
PRIMARY
SS
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