Pump Configuration - Riello NexPolar Series Installation And Technical Service Instructions

9
A delivery water temperature probe (accessory) must be in-
stalled on-site, on the common pipes. For the probe character-
istics and electrical connections, please refer to the instructions
furnished along with the accessory.
9
An RS485 communication cable (not provided) must be con-
nected to each unit.
b. Temperature
All the units installed in the same master/slave group have the
same operating mode and the same setpoint.
The master unit is connected to a user interface that can be in-
stalled on-site or in a remote location. The "master" user interface
is a point in which decisions are made for all the other units in
the same master/slave group. This means that the operating mode
(cooling/heating) and the water setpoint defined on the master
unit will be distributed to the other "slave" units.
If the control panel's display is connected to a slave unit, any chang-
es to the operating mode or the setpoint will be ignored.
When there are at least two units configured in the master/slave
assembly, it is possible to define how the compressors will be ac-
tivated. There are three different methods for controlling the com-
pressor.
4.7

Pump configuration

The circuit's water pump can be configured in different ways:
— Unit with hydronic module (internal main pump included),
— Unit without hydronic module (an external main pump must
be added),
Possible pump configurations
Internal main pump
External main pump
DHW installation
Master/slave installation
9
The installer is responsible for protecting the auxiliary pumps
against low water flow (no flow switch can be managed by the
unit's control).
logica della pompa principale
[P565]
Always on
Water sampling
Based on the room
temperature
The additional pump's status (on/off) depends on the type of in-
stallation (options, accessories, applications). In the compatibility
auxiliary pump logic
[P573]
No auxiliary pump
Always on
Based on the room
temperature
Always on, except when
DHW is enabled
Internal main pump
Fixed speed pump
no
yes
yes
local remote
control control
panel panel
yes yes
yes N.A.
N.A. yes
local remote
control control Mode off
panel panel
yes yes Off
yes yes Off
N.A. yes Off
yes yes Off
• The compressors can be activated:
Based on the configuration of the addresses: The master unit is
activated first. Afterwards, the slave units are activated in sequence
(starting with slave no. 1, and finishing with slave no. 3, for exam-
ple). Upon shutdown, the last slave available on the network shuts
down first, and the master is the last unit to be shut down.
Based on the wear factor: The units are activated in sequence
based on the wear factor. When the flow rate is increased, the unit
with the lowest wear factor is activated first, and when the flow
rate is decreased, the unit with the highest wear factor is shut down
first.
Simultaneously: All the units are activated and shut down simul-
taneously. The compressor's frequency is increased or decreased
simultaneously on all the units.
For more information about the master/slave icon displayed on the
Control Panel, please refer to the Control Panel's manual.
9
In the event of a master/slave communication error, the
master unit will either begin to operate in stand-alone
mode, or else will continue to operate with the other slave
units that have remained connected. The functions of the
slave unit concerned will be interrupted.
— If the installation includes a secondary water circuit, an addi-
tional pump can be mounted on this circuit.
External main pump (not
provided)
Fixed speed pump
no
yes
no
9
The main pump's status (on/off) depends on the type of instal-
lation (options, accessories, applications). In the compatibility
table shown below, and the various control logics for the main
pump are shown based on the installation:
Cooling/heating mode
Mode off
request
met
Off On
Off (on for
Off
sampling)
Based on IAT vs air
Off
setpoint
table shown below, the various control logics for the main pump
are shown based on the installation:
Cooling/heating mode
request
request
met
Off Off
On On
Based on IAT
On
vs air setpoint
On On
51
auxiliary pump (not provided)
Fixed speed pump
yes
yes
yes
yes
(only on the master unit)
Boiler
request on
On Off
On Off
On Off
Boiler DHW
on off Enabled Disabled
Off N.A. N.A.
On N.A. N.A.
On N.A. N.A.
On N.A. Off
FUNCTIONS
off
N.A.
N.A.
N.A.
N.A.
N.A.
N.A.
N.A.