6
INSTALLATION
Multichiller-Evo general connection diagram
The diagram on the next page represents all the electrical connections that the user must make to properly install the Multichiller-Evo accessory. The probes
used are supplied and the cable is 15 m long, while the power supply cable must be wired during installation
Index Component
1
NTC probe to be installed:
•
Outdoors, in case of Air/Water chiller;
•
On the source return, in case of Water/Water chiller;
2
NTC probe to be installed outdoors (to be set for the climatic curve) or 0-10V or 4-20mA signal for multifunction input
3
In 2- or 4-pipe systems, NTC probe to be installed outdoors with climatic function for the recovery side or 0-10V or 4-20mA signal for multifun-
ction input
4
NTC probe to be installed on the system return (probe sump supplied)
5
NTC probe to be installed on the system flow (probe sump supplied)
6
NTC probe to be installed on the return recovery (in 2/4-pipe systems)
7
NTC probe to be installed on the flow recovery (in 2/4-pipe systems)
8
Digital inputs available (normally open):
ID1 = system side season change (the settings on the open/closed status are available on the installer’s menu);
ID2 = System side On/Off (open = On, closed = Off);
ID3 = 2/4-pipe system recovery side On/Off (open = On, closed = Off);
ID4 = Secondary system side set point (open = Set1, closed = Set2);
ID5 = Secondary recovery side set point (open = Set1, closed = Set2);
ID6 = Multifunction system side enabling (open = enabled, closed = disabled);
ID7 = Multifunction recovery side enabling in 2/4-pipe systems (open = enabled, closed = disabled);
Attention: multifunction inputs ID6 and ID7 must also be enabled from the display;
ID8 = External alarm, system stopped and 2/4-pipe system recovery (open = no alarm, closed = alarm)
9
Digital output for summary of global alarms both for chillers and Multichiller Evo;
10
RS485 serial connection: MODBUS RTU protocol, baudrate 19200, 8bit of data, no parity, 2 bit stop.
Each chiller must be fitted with a special
board for RS485 serial communication (to set the said board, refer to the chiller’s manual)
.
Total maximum length (from Multichiller-Evo to the last connected chiller) for the modbus network = 500m
11
12
Multichiller-Evo power supply (230V~50/60Hz);
Use H05V-K or N07V-K cables with 300/500V insulation; minimum section > 1.5 mm
2
13
pCOe expansion board power supply (24Vac). Power the pCOe board from the dedicated transformer. On installation, a Class II safety transfor-
mer of at least 15 VA must be used to power just one expansion. It is recommended to separate the power supply of the pCOE expansion from
that of the rest of the electric devices (contactors and other electro-mechanical components) inside the electric control board. Whenever the
secondary of the transformer is on the ground, check that the earth wire is connected to terminal G0. Make sure that references G and G0 of
all boards present in the control board are respected (the G0 reference must be kept for all boards).
14
AERNET accessory connection
15
Connection between the pCO5 board and Touch screen display. With software versions < 1.2.0 (obsolete), the touch screen must be con-
nected to port J25 of board pCO5+
Notes regarding connection of Multichiller-Evo probes
The temperature probes supplied with the Multichiller-Evo accessory must be used differently according to the type of unit used. The table below summa-
rises the connections for supplied probes based on the type of unit used and according to the potential functions selected for MULTICHILLER-EVO accessory
functioning:
Type of chiller:
pCO5 analogue inputs
(probes required for functioning)
pCOe analogue inputs
(probes required for functioning)
U1
U2
U3
B1
B2
B3
B4
Cooling Only
YES
YES
(1)
NO
YES
YES
NO
NO
Heat pump
Multipurpose
Optional
(1)
Optional
(2)
Optional
(2)
YES
YES
YES
YES
Notes regarding probes:
(1)
This probe is required if you want to use the multifunction input controlled by NTC (refer to page 28 for more information), otherwise this probe does not
need to be installed;
Notes regarding optional probes (these probes are not supplied):
(1)
This probe can be used if you want to see the outdoor air temperature;
(2)
This probe is recommended if you want to use the multifunction input controlled by NTC (refer to page 28 for more information);
Summary of Contents for Multichiller-Evo
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