Main Components Of The Outdoor Unit And The Indoor Unit; Outdoor Unit Watersystem - Daikin EBHQ006BAV3 Installation Manual

Opening of the indoor unit
To gain access to the unit, the front cover needs to be opened as
shown in the figure below
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 (outdoor unit and indoor
unit).
Do not touch the refrigerant pipes during and
immediately after operation as the refrigerant pipes
may be hot or cold, depending on the condition of the
refrigerant flowing through the refrigerant piping,
compressor, and other refrigerant cycle parts. Your
hands may suffer burns or frostbite if you touch the
refrigerant pipes. To avoid injury, give the pipes time to
return to normal temperature or, if you must touch
them, be sure to wear proper gloves.
Do not touch the internal parts (pump, backup heater,
etc.) during and immediately after operation.
Your hands may suffer burns if you touch the internal
parts. To avoid injury, give the internal parts time to
return to normal temperature or, if you must touch
them, be sure to wear proper gloves.
DANGER
Do not touch water pipes during and immediately after
operation as the pipes may be hot. Your hand may
suffer burns. To avoid injury, give the piping time to
return to normal temperature or be sure to wear
proper gloves.
When service panels are removed, live parts can be
easily touched by accident.
Never leave the unit unattended during installation or
servicing when the service panel is removed.
DANGER: ELECTRICAL SHOCK
See "2. General Safety precautions" on page 2.
DANGER: DO NOT TOUCH PIPING AND INTERNAL
PARTS
See "2. General Safety precautions" on page 2.
Installation manual
6
5.2. Main components of the outdoor unit and the

Outdoor unit watersystem

1x
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. Air purge valve
11. Water filter
12. Temperature sensors (thermistors)
13. Power supply intake
14. Thermistor interconnection cable intake
15. Shut-off valves (accessory)
16. Flow switch
17. Pressure relief valve
indoor unit
1
2
6
12a
5
11
Switch box
The switch box contains connection terminals for the power
supply and a connection point for the thermistor interconnection
cable.
Heat exchanger
Water inlet connection (1" MBSP)
Water outlet connection (1" MBSP)
Pump
The pump circulates the water in the water circuit.
Manometer
The manometer allows readout of the water pressure in the
system.
Expansion vessel (6 litre)
The water in the water circuit expands with rising temperatures.
The expansion vessel stabilises the pressure changes with
changing water temperatures by giving free space to the
changing water volume.
Expansion vessel service point
The service point allows connection of a dry nitrogen cylinder to
adjust the expansion vessel pre-pressure if necessary.
Drain and fill valve (2x)
Remaining air in the water circuit will be automatically removed
via the air purge valve.
The water filter removes dirt from the water to prevent damage
to the pump or blockage of the heat exchanger. The water filter
should be cleaned on a regular base. See "16. Maintenance and
service" on page 43.
Two temperature sensors determine the water inlet temperature
(12a) and water outlet temperature (12b). A third thermistor
(12c) measures the refrigerant temperature.
The shut-off valves on the water inlet connection and water
outlet connection allow isolation of the outdoor unit water circuit
side from the residential water circuit side. This facilitates
draining and filter replacement of the outdoor unit.
The flow switch checks the flow in the water circuit and protects
the heat exchanger against freezing and the pump against
damage. In case the minimum required flow is not achieved, the
unit will be shut down.
The pressure relief valve prevents excessive water pressure in
the water circuit (≥3 bar).
10
12b 12b 12c
17
7
8
16
9 14 3 15 4 13 9
EBHQ006+008BAV3 + EKCBX/H008BAV3
Unit for air to water heat pump system
4PW64602-1A – 09.2010