UM / UM PLUS
Chillers and inverter air / water heat pumps with axial fans
14
7.7.1
Wiring terminal block
Electrical wiring have to be done only by qualified personnel.
The electrical connections have to be realized by qualified personnel.
The terminal block is located under the plastic cover on the
side of the hydraulic connections (for the models 12 and 16, it is necessary to remove the protective carter). The wiring to the
terminal block has to be realized in accordance to the below notes (the drawing is for illustration).
The connections indicated below are standard. Other connections are shown in the manual of the on board control of the
minichiller UM / UM Plus (see "TABLE OF CONFIGURATIONS ALLOWED TO USER AND INSTALLER"), depending on the configurations
adopted.
Terminal Type
Connection
GND Power
supply
1-Ph/N/PE
230V, 50Hz
(3-Ph/N/PE
400 Vac, 50Hz for the model of 15kW)
Connect the grounding wire
N1 Power
supply
1-Ph/N/PE
230V, 50Hz
(3-Ph/N/PE
400 Vac, 50Hz for the model of 15kW)
Connect the power supply neutral wire;
L1 Power
supply
1-Ph/N/PE
230V, 50Hz
(3-Ph/N/PE
400 Vac, 50Hz for the model of 15kW)
Connect the power supply phase wire; (note that, in the three-phases
versions there are two other terminals, L2 and L3)
NC1
Digital output
230 Vac with changeover contact
Power supply NC terminal (230V AC) for 3-way valve for sanitary hot water
boiler (used only for 3-way valve with 3 contacts for power supply
connection to switching-over to the plant side)
N
Digital output
230 Vac with changeover contact
Power supply neutral terminal (230V AC) for 3-way valve for sanitary hot
water boiler.
NO1
Digital output
230 Vac with changeover contact
Power supply NO terminal (230V AC) for 3-way valve for sanitary hot water
boiler (to switch-over the valve to the boiler side).
NC2
Digital output
230 Vac with changeover contact
Power supply NC terminal (230V, 50Hz, 5A resistive, 1 A inductive) for 3-
way dual set point valve for radiant panels.
N2
Digital output
230 Vac with changeover contact
Power supply neutral terminal (230V AC) for 3-way dual set point valve for
radiant panels.
NO2
Digital output
230 Vac with changeover contact
Power supply NO terminal (230V, 50Hz, 5A resistive, 1 A inductive) 3-way
valve dual set point for radiant panels.
R+
Serial communication
signal connection to remote control
R-
Serial communication
Modbus - signal connection to remote control
GNDR
Serial communication
connection to modbus ground for remote control
12V+
Power supply output 12Vac, 50Hz
Power output for remote control (12V, 50Hz, 500mA)
12V-
Power supply output 12Vac, 50Hz
Power output for remote control (12V, 50Hz, 500mA)
SE
Analogue (ST8)/digital (DI7) input
Humidistat terminal for the dual set-point regulation (optional)
SE
Analogue (ST8)/digital (DI7) input
Humidistat terminal for the dual set-point regulation (optional)
AEHN
Digital output (DO3) 230 Vac
Neutral output of auxiliary electric heater for plant water (230V, 50Hz, 5A)
AEH
Digital output (DO3) 230 Vac
Phase output of auxiliary electric heater for plant water (230V, 50Hz, 5A)
SAN
Analogue (ST9)/digital (DI8) input
Sanitary water boiler sensor terminal
