Switch Box Main Components - Daikin EKHBH016BB6V3 Instruction Manual

1. Air purge valve
Remaining air in the water circuit will be automatically removed
via the air purge valve.
2. Backup heater
The backup heater consists of an electrical heating element in
the backup heater vessel that will provide additional heating
capacity to the water circuit if the heating capacity of the outdoor
unit is insufficient due to low outdoor temperatures.
3. Temperature sensors
Four temperature sensors determine the water and refrigerant
temperature at various points in the water circuit.
4. Switch box
The switch box contains the main electronic and electrical parts
of the indoor unit.
5. Heat exchanger
6. Expansion vessel (10 l)
7. User interface
The user interface allows the installer and user to set up, use
and maintain the unit.
8. Refrigerant liquid connection
9. Refrigerant gas connection
10. Shut-off valves (accessory)
The shut-off valves on the water inlet connection and water
outlet connection allow isolation of the indoor unit water circuit
side from the residential water circuit side. This facilitates
draining and filter replacement of the indoor unit.
11. Water inlet connection
12. Water outlet connection
13. Drain and fill valves
14. Water filter
The water filter removes dirt from the water to prevent damage
to the pump or blockage of the evaporator. The water filter must
be cleaned on a regular base. See
service" on page 45.
15. Manometer
The manometer allows readout of the water pressure in the
water circuit.
16. Flow switch
The flow switch checks the flow in the water circuit and protects
the heat exchanger against freezing and the pump against
damage.
17. Pump
The pump circulates the water in the water circuit.
18. Backup heater thermal protector
The backup heater is equipped with a thermal protector. The
thermal protector is activated when the temperature becomes
too high.
19. Backup heater thermal fuse
The backup heater is equipped with a thermal fuse. The thermal
fuse is blown when the temperature becomes too high (higher
than the backup heater thermal protector temperature).
20. Pressure relief valve
The pressure relief valve prevents excessive water pressure in
the water circuit by opening at 3 bar and discharging some
water.
21. Pressure relief valve hose
The actual outlet of the pressure relief valve. Make sure to
provide a proper drain.
Installation manual
11

5.3. Switch box main components

"10. Maintenance and
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. DIP switch SS2
11. X13A socket
15
TR1
X9A
12
A1P
X13A
11
SS2
10
FU1
9
16 A4P
6
X2M
6
X1M
Backup heater contactors K1M, K2M, K5M and K6M.
Main PCB
The main PCB (Printed Circuit Board) controls the functioning of
the unit.
Booster heater contactor K3M (only for installations with
domestic hot water tank)
Booster heater circuit breaker F2B (only for installations with
domestic hot water tank)
The circuit breaker protects the booster heater in the domestic
hot water tank against overload or short circuit.
Backup heater circuit breaker F1B, F3B
The circuit breaker protects the backup heater electrical circuit
against overload or short circuit.
Terminal blocks
The terminal blocks allow easy connection of field wiring.
Cable tie mountings
The cable tie mountings allow to fix the field wiring with cable
ties to the switch box to ensure strain relief.
Terminal blocks X3M, X4M (only for installations with domestic
hot water tank)
PCB fuse FU1
The DIP switch SS2 provides 4 toggle switches to configure
certain installation parameters. See
overview" on page 23.
The X13A socket receives the K3M connector (only for
installations with domestic hot water tank).
Indoor unit for air to water heat pump system
K1M K2M K5M
K3M K6M
F2B F3B F1B
K4M
FU2
X4M
X3M
"8.1. DIP switch settings
EKHBH/X016BB
4PW62572-1A – 01.2011
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5
14
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