Precautions On Refrigerant Piping; Caution For Brazing; Connecting The Refrigerant Piping - Daikin altherma EMRQ8AAY1 Installation Manual

10. P
RECAUTIONS ON REFRIGERANT PIPING
■
Do not allow anything other than the designated refrigerant to
get mixed into the freezing cycle, such as air, etc. If any
refrigerant gas leaks while working on the unit, ventilate the
room thoroughly right away.
■
Use R410A only when adding refrigerant
■
Installation tools:
Make sure to use installation tools (gauge manifold charge hose,
etc.) that are exclusively used for R410A installations to
withstand the pressure and to prevent foreign materials (e.g.
mineral oils and moisture) from mixing into the system.
■
Vacuum pump:
Use a 2-stage vacuum pump with a non-return valve.
Make sure the pump oil does not flow oppositely into the system
while the pump is not working.
Use a vacuum pump which can evacuate to –100.7 kPa (5 Torr,
–755 mm Hg).
■
Protection against contamination when installing pipes
- Take measures to prevent foreign materials like moisture and
contamination from mixing into the system.
Installation period
More than a month
Less than a month
Regardless of the period
- Block all gaps in the holes for passing out piping and wiring
using sealing material (field supply). (The capacity of the unit
will drop and small animals may enter the machine.)
Example: passing piping out through the front
1
- Use clean pipes only.
- Hold the pipe end downwards when removing burrs.
- Cover the pipe end when inserting it through a wall so that no
dust or dirt enters the pipe.
After all the piping has been connected, make sure there is
no gas leak. Use nitrogen to perform a gas leak check.
Installation manual
13
Protection method
Pinch the pipe
Pinch or tape the pipe
1 Plug the areas marked with
" ".
(When the piping is routed
from the front panel.)

10.1. 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 2
6
1 Refrigerant piping
2 Part to be brazed
3 Taping
4 Hands valve
5 Pressure-reducing valve
6 Nitrogen
■
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.

10.2. Connecting the refrigerant piping

■
NOTE 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.
■
Ensure that the field piping and connections are
not subjected to stress.
1. Decide front or side connection.
Installation of refrigerant piping is possible as front connection or
side connection (when taken out from the bottom) as shown in
the figure below:
1 Left-side connection
2 Front connection
3 Right-side connection
3 4 5
6
3
2
1
EMRQ8~16AAY1
Daikin Altherma outdoor unit
4PW61262-1B – 2013.11