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Table 24 - Electrical data for optional pumps
Unit model
Engine power
(KW )
Engine
current
requirement (A)
Low head
High head
Low head
High head
ST/LN
EW AD 100E ÷140E-SS
EW AD 100E ÷130E-SL
1.5
2.2
3.5
5.0
EW AD 160E ÷ 210E-SS
EW AD 160E ÷ 210E-SL
2.2
3.0
5.0
6.0
EW AD 260E-SS
EW AD 250E-SL
3.0
5.5
6.0
10.1
EW AD 310E ÷ 410E-SS
EW AD 300E ÷ 400E-SL
4.0
5.5
8.1
10.1
Should the installation use pumps that are external to the machine (not supplied with the unit), a thermal-magnetic circuit
breaker and a control contactor must be foreseen on the power supply line of each pump.
Water pump control
– Electrical Wiring
In case of external water pumps, control is managed by the on-board microprocessor of the unit. However, a minimum
field wiring is required to the customer. Connect the pump contactor coil to terminals 527, 528 (pump #1) and 530, 531
(pump #2) of the customer terminal board MC115 and series connect it to an external power source. Check that the coil
voltage matches the power supply voltage.
The microprocessor digital output port used for water pump control has the following commutation capacity:
Maximum voltage:
250 Vac
Maximum current:
2 A Resistive - 2 A Inductive
Reference standard:
EN 60730-1
It is a good practice to install a pump status dry-contact on the pump circuit breaker and to series connect it to a flow
switch.
Alarm relays
– Electrical wiring
The unit has a dry-contact digital output that changes state whenever an alarm occurs in one of the refrigerant circuits.
Connect terminals 525, 526 of the terminal board MC115 to an external visual, sound alarm or to the BMS in order to
monitor its operation.
Unit On/ Off remote control
– Electrical wiring
The machine has a digital input (terminals 703,745 of the terminal board MC24) that allows remote control with an
external dry-contact. A startup timer, a circuit breaker or a BMS can be connected to this input. Once the contact has
been closed, the microprocessor launches the startup sequence by first turning on the first water pump and then the
compressors. When the remote contact is opened the microprocessor launches the machine shutdown sequence.
Alarm from external device
– Electrical wiring (Optional)
This function allow the unit to be stopped from an external alarm signal. Connect terminals 883, 884 of the terminal
board MC24 to a dry-contact of a BMS or an external alarm device.
Double Setpoint
– Electrical wiring
The Double Setpoint function allows to switch the unit setpoint between two previously set values on the unit controller.
An example of a typical application is ice production during the night and standard operation during the day. Connect a
switch or a timer (dry-contact) between terminals 703 and 728 of the terminal board MC24.
External water Setpoint reset
– Electrical wiring (Optional)
The unit local setpoint can be set by means of an external analog 4-20 mA signal. Once this function is enabled, the
microprocessor allows to adjust the setpoint from the set local value up to a differential of 3°C. 4 m A correspond to 0°C
reset, 20 mA correspond to the setpoint plus the maximum differential allowed.
