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P
IPING CONNECTION WORK
Refrigerant piping work
For all guidelines, instructions and specifications regarding
refrigerant piping work between the indoor unit and the outdoor unit,
please refer to the outdoor unit installation manual.
I
Before brazing protect the inside of the unit against
damage caused by the flame when brazing.
I
When brazing the refrigerant connections make sure
to cool the refrigerant filters of the R410A circuit (with
a cloth soaked with cold water) inside the unit. For
location of the refrigerant filters refer to the figure
below.
Guidelines for flare connection
I
Flares should not be re-used. New ones should be made in
order to prevent leaks.
I
Use a pipe cutter and flare tool suitable for the refrigerant used.
I
Only use the annealed flare nuts included with the unit. Using
different flare nuts may cause the refrigerant to leak.
I
Please refer to the table for flaring dimensions and tightening
torques (too much tightening will result in splitting the flare).
Piping size
Tightening
(mm)
torque (N•m)
Ø9.5
33~39
Ø15.9
63~75
I
When connecting the flare nut, coat the flare inner surface with
ether oil or ester oil and initially tighten 3 or 4 turns by hand
before tightening firmly.
EKHBRD011~016ADV17+Y17
Indoor unit for air to water heat pump system
4P402191-1B – 2017.09
Flare dimensions A
Flare shape
(mm)
(mm)
90 ±2
12.8~13.2
A
R=0.4~0.8
19.4~19.7
I
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:
I Tighten the flare nut using a spanner until the tightening
torque suddenly increases.
I 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:
I
The maximum water pressure is 4 bar.
I
The maximum water temperature is 85°C.
I
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 is provided to drain the water
from the indoor unit water system.
I
Make sure to provide a proper drain for the pressure relief valve
to avoid any water coming into contact with electrical parts.
I
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.
I
Take care that the components installed in the field piping can
withstand the water pressure and temperature.
I
Always use materials which are compatible with the water used
in the system and with the materials used on the indoor unit.
WARNING
It is strongly recommended to install an additional filter on
the heating water circuit. Especially to remove metallic
particles from the field heating piping, it is advised to use a
magnetic or cyclone filter which can remove small
particles. Small particles can damage the unit and will not
be removed by the standard filter of the heat pump unit.
Piping union
Spanner
Flare nut
Torque wrench
Recommended arm
length of spanner (mm)
60~90
±200
30~60
±300
Installation manual
12
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