Switch Box Main Components; Functional Diagram - Daikin EKHBRD-AY1 Installation Manual

Switch box main components

V1 unit types (1-phase)
10 7 14
8
18
15
12
20
13
1
2
3
5
19
6
Y1 unit types (3-phase)
10 7 14 11 17 16
8
18
15
12
13
20
23
4
1
2
3
19
1. Main PCB
The main PCB (Printed Circuit Board) controls the functioning of
the unit.
2. Control PCB
3. Inverter PCB
4. Inverter control PCB (only Y1)
5. QA PCB (only V1)
6. Filter PCB
7. Digital I/O PCB (optional)
8. Demand PCB (optional)
9. Terminal block X1M
Main terminal block which allows easy connection of field wiring
for power supply.
Installation manual
7
11 17 15 16 15 21 9
15 9 15 21 22 6
10. Terminal block X3M
Field wiring terminal block for DC connections.
11. Terminal block X2M
Field wiring terminal block for AC connections.
12. DC connector X1Y
13. Pump connector X2Y
14. AC connector X3Y
15. Cable tie mountings
The cable tie mountings allow to fix the field wiring with cable
ties to the switch box to ensure strain relief.
16. Power wiring entry
17. AC field wiring entry
18. DC field wiring entry
19. Compressor cable entry
20. Interface relay K1A
21. Wiring bridges
22. Fuse F1 (only Y1)
23. Fuse F2 (only Y1)
NOTE The electrical connection diagram can be found on the
inside of the switch box cover.

Functional diagram

2
9 8
29 28
3
6 6
22
4
23
30 25
5
1
1 Outdoor unit
2 Indoor unit
3 Refrigerant-refrigerant
heat exchanger
4 Accumulator
5 Compressor
6 Service port
7 Refrigerant-water heat
exchanger
8 Drain valve
9 Electronic expansion
valve
10 Pressure relief valve
11 Pump
12 Air purge valve
13 Manometer
14 Expansion vessel
15 Water filter
12
11
27
15
7
19
26 14 10 13
M
21 20
16 Fill valve (field supply)
17 Shut-off valve water inlet
18 Shut-off valve water outlet
19 Domestic hot water tank
(optional)
20 Motorized 3-way valve
(optional)
21 Thermal cut-out (Q2L)
22 High pressure switch (S1PH)
23 High pressure sensor (B1PH)
24 Low pressure sensor (B1PL)
25 Discharge thermistor (R6T)
26 Leaving water thermistor (R5T)
27 Returning water thermistor
(R4T)
28 Liquid thermistor R134a (R7T)
29 Liquid thermistor R410A (R3T)
30 2-way valve
EKHBRD011~016AAV1+Y1
Indoor unit for air to water heat pump system
4PW54465-1C
16
17
18