Refrigerant Piping Work; Guidelines For Flare Connection; Water Piping; General Precautions Concerning Water Circuit - Daikin EKHVH008BB6V3 Installation Manual

6.5. Refrigerant piping work

WARNING
Installation shall be done by an installer, the choice of
materials and installation shall comply with the applicable
legislation. In Europe the EN378 is the applicable standard
that shall be used.
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.
NOTICE
Before brazing protect the inside of the unit against
damage caused by the flame when brazing.
It is not needed to take out the back plate for the
installation.
Guidelines for flare connection
■
Flares should not be re-used. New ones should be made in
order to prevent leaks.
■
Use a pipe cutter and flare tool suitable for the refrigerant used.
■
Only use the annealed flare nuts included with the unit. Using
different flare nuts may cause the refrigerant to leak.
■
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
■
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.
■
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.
4 2
1
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 60~90
Ø15.9 30~60
Installation manual
14
Flare dimensions A Flare shape
(mm) (mm)
90 ±2
12.8~13.2
A
19.4~19.7
1 Piping union
2 Spanner
3 Flare nut
4 Torque wrench
Recommended arm
length of spanner (mm)
±200
±300
Caution for brazing.
■
Make sure to blow through with nitrogen when
brazing.
Blowing through with nitrogen prevents the creation of
large quantities of oxidized film on the inside of the
piping. An oxidized film adversely affects valves and
compressors in the refrigerating system and prevents
proper operation.
■
The nitrogen pressure should be set to 0.02 MPa (i.e.,
just enough so it can be felt on the skin) with a
pressure-reducing valve.
1
■
Do not use anti-oxidants when brazing the pipe joints.
Residue can clog pipes and break equipment.
■
Do not use flux when brazing copper-to-copper
refrigerant piping. Use phosphor copper brazing filler
alloy (BCuP) which does not require flux.
■
Flux has an extremely harmful influence on refrigerant
piping systems. For instance, if chlorine based flux is
used, it will cause pipe corrosion or, in particular, if the
flux contains fluorine, it will deteriorate the refrigerant
oil.
R=0.4~0.8

6.6. Water Piping

The unit is equipped with a water inlet and water outlet for connection
to a water circuit. This circuit must be provided by an installer and
must comply with the applicable legislation.
NOTICE
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.

6.7. General precautions concerning water circuit

Before continuing the installation of the unit, check the following
points:
■
The maximum water pressure is 4 bar.
■
The maximum water temperature is 65°C.
■
Provide adequate safeguards in the water circuit to be sure that
the water pressure will never exceed the maximum allowable
working pressure (4 bar).
■
Shut-off valves from flexible hoses delivered with the unit should
be installed so that normal servicing can be accomplished
without draining the system.
■
Drain taps must be provided at all low points of the system to
permit complete drainage of the circuit during maintenance or
service to the unit. A drain valve is provided in the unit to drain
the water from the unit water system.
2 3 4
6
1 Refrigerant piping
2 Part to be brazed
3 Taping
4 Hands valve
5 Pressure-reducing valve
6 Nitrogen
EKHVH/X008BB6V3 + EKHVH/X008BB6+9WN
Daikin Altherma indoor unit
5
6
4PW64329-1 – 07.2010