Daikin EHYHBH05AAV3 Service Manual page 34

Wiring Diagrams
3.2 Overview Switch Box
1 1
3
4
5
Part 1 – System Outline
Part number Description
A4P Digital I/O PCB, receiver PCB (wireless ON/OFF thermostat, PC= power circuit)
(optional)
A8P Demand PCB (optional)
TR1, TR2 Power supply transformer
A1P Main PCB (hydro)
X*Y Connector
X*M Terminal strip
The next two figures ("PCB: part 1" and "PCB: part 2") show the wiring diagram of the hybrid PCB. The
different components are mentioned either on "PCB: part 1" or on "PCB: part 2”. The legend that is
attached mentions the description of each part number and can help to understand these two figures.
Some additional information on the PCB figures:
The contacts S1S, S2S and S3S, shown on PCB PART 1, fulfil the following functions:
S1S: Preferential kWh rate: can force the outdoor heat pump to switch off.
S2S: Electric power meter pulse input (for the purpose of energy metering).
S3S: Gas meter pulse input (for the purpose of energy metering).
The user interface (A2P, see drawing "PCB: PART 1"): is delivered as an accessory within the
unit. The connection diagram (see further) shows how to connect it to the PCB.
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ESIE13-02A