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When loosening a flare nut, always use two wrenches together.
When connecting the piping, always use a spanner and torque
wrench together to tighten the flare nut to prevent flare nut
cracking and leaks.
1
4
2
2
3
1
4
3
Not recommended, but in case of emergency
Should you be forced to connect the piping without a torque
wrench, follow the following installation method:
Tighten the flare nut using a spanner until the tightening
torque suddenly increases.
From that position further tighten the flare nut the angle listed
below:
Piping size
Further tightening
(mm)
angle (degrees)
Ø9.5
Ø15.9
Water piping work
Checking the water circuit
The units are equipped with a water inlet and water outlet for
connection to a water circuit. This circuit must be provided by a
licensed technician and must comply with all relevant European and
national regulations.
The unit is only to be used in a closed water system.
Application in an open water circuit can lead to excessive
corrosion of the water piping.
Before continuing the installation of the unit, check the following
points:
The maximum water pressure is 4 bar.
The maximum water temperature is 85°C.
Drain taps must be provided at all low points of the system to
permit complete drainage of the circuit during maintenance.
One drain valve in the indoor unit, and a drain valve on the
expansion vessel are provided to drain the water from the indoor
unit water system.
Make sure to provide a proper drain for the pressure relief valve
to avoid any water coming into contact with electrical parts.
Air vents must be provided at all high points of the system. The
vents should be located at points which are easily accessible for
servicing. An automatic air purge is provided inside the indoor
unit. Check that this air purge valve is not tightened too much so
that automatic release of air in the water circuit remains possible.
Take care that the components installed in the field piping can
withstand the water pressure and temperature.
Always use materials which are compatible with the water used
in the system and with the materials used on the indoor unit.
Installation manual
11
Piping union
Spanner
Flare nut
Torque wrench
Recommended arm
length of spanner (mm)
60~90
±200
30~60
±300
Checking the water volume and expansion vessel
pre-pressure
The unit is equipped with an expansion vessel of 12 litre which has a
default pre-pressure of 1 bar.
To assure proper operation of the unit, the pre-pressure of the
expansion vessel might need to be adjusted and the minimum and
maximum water volume must be checked.
1
Check that the total water volume in the installation, excluding
the internal water volume of the unit, is 20 l minimum.
In most applications this minimum water volume will have a
satisfying result.
In critical processes or in rooms with a high heat load
though, extra water volume might be required.
When circulation in each space heating/radiator loop is
controlled by remotely controlled valves, it is important that
this minimum water volume is kept even if all the valves are
closed.
Example
1
11
2
3
11
5
1
Outdoor unit
2
Indoor unit
3
Refrigerant heat
exchanger
4
Water heat exchanger
5
Compressor
6
Pump
7
Shut-off valve
8
Collector (field supply)
9
By-pass valve
(field supply)
2
Using the table below, determine if the expansion vessel pre-
pressure requires adjustment.
A
C1
4
6
7 7 8
9
M3
M2
M1
10
Radiator (field supply)
11
Electronic expansion
valve
C1
Remote controller
M1...M3
Individual motorized valve
to control loop radiators
(field supply)
T1...T3
Individual room
thermostat (field supply)
A
Installation space
B
Living room
EKHBRD011~016AAV1+Y1
Indoor unit for air to water heat pump system
4PW54465-1C
B
10
T3
T2
T1
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