Daikin EKHBX030BA Installation Manual page 20

WARNING
After finishing the electric work, confirm that each electric
part and terminal inside the electric parts box is connected
securely.
Internal wiring - Parts table
Refer to the internal wiring diagram supplied with the unit (on the
inside of the indoor unit switch box cover). The abbreviations used
are listed below.
A1P ................. Main PCB
A2P ................. Digital controller PCB (user interface)
A3P ......... * ..... Thermostat (EKRTWA) (PC= internal Power Cicuit)
(optional)
A4P ......... * ..... Digital I/O PCB (EKRP1HB) (optional)
E1H ................. Backup heater element 1
E2H ................. Backup heater element 2
E4H ......... # ..... Booster heater (3 kW)
F1B,F3B .......... Fuse backup heater
F2B.......... # ..... Fuse booster heater
F1T.................. Thermal fuse backup heater (250 V, 201.2°F (94°C))
FU1 ................. Fuse 3.15 A T 250 V for PCB
FU2 ................. Fuse 5 A T 250 V
FU3 ................. Fuse 1 A T 250 V
FuR,FuS.......... Fuse 5 A 250 V for digital I/O PCB
K1A~K4A......... Relays for valves and thermostat
K5A~K7A......... Relays for digital I/O PCB kit
K1M................. Contactor backup heater step 1
K2M................. Contactor backup heater step 2
K3M......... # ..... Contactor booster heater
K5M,K6M ........ Contactor for backup heater all pole disconnection
M1P................. Pump
M2S....... ## ..... 2-way valve for cooling mode (field supply)
M3S......... # ..... 3-way valve: floor heating/domestic hot water
PHC1............... Optocoupler input circuit
Q1DI................ Ground fault circuit interrupter (field supply)
Q1L ................. Thermal protector backup heater
Q2L,Q3L.. # ..... Thermal protector booster heater
R1T ......... * ..... Ambient sensor (EKRTWA) (optional)
R1T ................. Outlet water heat exchanger thermistor
R2T ................. Outlet water backup heater thermistor
R3T ................. Refrigerant liquid side thermistor
R4T ................. Inlet water thermistor
R5T ......... # ..... Domestic hot water thermistor
S1L.................. Flow switch
S1S ................. Solar pump station relay
S2S ................. Benefit kWh rate power supply contact
S3S ................. Dual set point 2 contact
S4S ................. Dual set point 1 contact
SS1 ................. DIP switch
TR1,TR2.......... Transformer 24 V for PCB, for relays and valves
X1M~X9M ....... Terminal blocks
* Optional
# Applications with domestic hot water tank only
## Heating/cooling applications only
Installation manual
18
Field wiring guidelines
Most field wiring on the indoor unit side is to be made on the
terminal block inside the switch box. To gain access to the
terminal block, remove the indoor unit cover and switch box
service panel, see "Opening the indoor unit" on page 9.
WARNING
Switch off all power supply – i.e. outdoor unit power
supply and backup heater and domestic hot water
tank power supply (if applicable) – before removing
the switch box service panel.
Cable tie mountings are provided at the bottom of the switch
box. Fix all cables using cable ties (field supply).
A dedicated power circuit is required for the backup heater.
Installations equipped with a domestic hot water tank (optional),
require a dedicated power circuit for the booster heater.
Please refer to the domestic hot water tank installation manual.
Connection of the indoor unit power supply and
communication cable
Power circuit and cable requirements
Power supply for the indoor unit is to be provided through the outdoor
unit. Data communication with the outdoor unit is provided through
the same cable.
For all guidelines and specifications regarding field wiring between
the indoor unit and the outdoor unit, please refer to the outdoor unit
installation manual.
Procedure
1 Using the appropriate cable, connect the communication circuit
to the appropriate terminals as shown on the wiring diagram and
the illustration below.
2 Connect the ground conductor (yellow/green) to the grounding
screw on the switch box mounting plate.
3 Fix the cable with cable ties to the cable tie mountings to ensure
strain relief.
4 When routing out cables, make sure that these do not obstruct
mounting of the indoor unit cover, see figure 3.
5 Select the appropriate field setting values for the bottom plate
heater. See "[F-02]", "[F-03]", and "[F-04]" on page 34.
Note: only relevant field wiring is shown.
1515a
X2M
X1M
1 2 3
1 2 3
1 2 3
X1Y Bottom plate heater
Indoor unit for air to water heat pump system
X3M
X1Y
1 2
1 2
EKHBH/X030BA
4PW62568-1 – 07.2010