Alarm Relays - Electrical Wiring; Unit On/ Off Remote Control - Electrical Wiring; Double Setpoint - Electrical Wiring; External Water Setpoint Reset - Electrical Wiring (Optional) - Daikin EWYD-BZ Series Installation, Maintenance & Operation Manual

Alarm relays – Electrical wiring
The unit has a clean-contact digital output that changes state whenever an alarm occurs in one of the refrigerant circuits.
Connect this signal to an external visual, sound alarm or to the BMS in order to monitor its operation. See the machine's
wiring diagram for wiring.
Unit On/ Off remote control – Electrical wiring
The machine has a digital input that allows remote control. 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 contact is opened the microprocessor launches the machine
shutdown sequence. The contact must be clean.
Double Setpoint – Electrical wiring
The Double Setpoint function allows to change over the unit setpoint between two predefined values in the unit controller
by interposing a circuit breaker. An example of an application is ice production during the night and standard operation
during the day. Connect a circuit breaker or timer between terminals 5 and 21 of terminal board M3. The contact must be
clean.
External water Setpoint reset – Electrical wiring (Optional)
The machine's local setpoint can be modified by means of an external analogue 4-20mA signal. Once this function has
been enabled, the microprocessor allows to modify the setpoint from the set local value up to a differential of 3°C. 4 mA
correspond to 0°C differential, 20mA correspond to the setpoint plus the maximum differential.
The signal cable must be directly connected to terminals 35 and 36 of the M3 terminal board.
The signal cable must be of the shielded type and must not be laid in the vicinity of power cables, so as not to induce
interference with the electronic controller.
Unit limitation – Electrical wiring (Optional)
The machine's microprocessor allows to limit the capacity according to two different criteria:
- Load limitation: The load can be varied by means of a 4-20mA external signal from a BMS.
The signal cable must be directly connected to terminals 36 and 37 of the M3 terminal board.
The signal cable must be of the shielded type and must not be laid in the vicinity of the power cables, so as not
to induce interference with the electronic controller.
Current limitation: The machine's load can be varied by means of a 4-20mA signal from an external device. In this
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case, current control limits must be set on the microprocessor so that the microprocessor transmits the value of the
measured current and limits it.
The signal cable must be directly connected to terminals 36 and 37 of the M3 terminal board.
The signal cable must be of the shielded type and must not be laid in the vicinity of the power cables, so as not
to induce interference with the electronic controller.
A digital input allows to enable the current limitation at the desired time. Connect the enabling switch or the
timer (clean contact) to terminals 5 and 9.
Attention: the two options cannot be enabled simultaneously. Setting one function excludes the other.
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