Daikin EWAD900BJYNN/A [159/346] Pco expansion

ESIE07-04 The Digital Controller

Part 2 – Functional Description 2–19

2.3.5 pCO Expansion

Carel expansion

board

The introduction of the Economizer functionality in the software requires the use of Carel expansion

board shown in the figure below.

This device needs to be addressed to ensure correct communication with controller via RS485

protocol. Addressing microswitches are placed nearby status LEDs (refer to key 6 inthe figure above).

Once the address is correctly set the expansion could be linked with PCO² board #1. The correct

connection is achieved connecting J23 pin on board #1 with J3 pin on the expansion board (note that

expansion board connector is different from the controller one, but wires must be placed in the same

positions of connectors). Expansion boards are only I/O extensions for the controller and don’t need

any software.

1 Power supply connector (G(+), G0 (-))

2 Analogue output 0 to 10 V

3 Network connector for expansions in RS485 (GND, T+, T-) or tLAN (GND, T+)

4 24 Vac/Vdc digital inputs

5 Yellow LED showing power supply voltage and 3 signalling LEDs

6 Serial address

7 Analogue inputs and probe supply

8 Relay digital outputs