Drain Work; Refrigerant Pipe Size And Allowable Pipe Length; Refrigerant Piping Material; Piping Material Selection - Daikin Altherma ERLQ018BAVJU Manuel D'installation

Drain work

Refer to "6.2. Weather dependent precautions" on page 5.
If drain work from the outdoor unit causes trouble (for example, if
the drain water may splash on people) provide a waterproof
plate (field supply) within 5.9 inch (150 mm) of the underside of
the unit.
Make sure the drain works properly.
NOTE If drain holes of the outdoor
unit are covered
mounting base or by floor
surface, raise the unit in
order to provide a free
space of more
3.94 inch (100 mm) under
the outdoor unit.
8. R
EFRIGERANT PIPE SIZE AND ALLOWABLE
PIPE LENGTH

8.1. Refrigerant piping material

NOTE Piping and other pressure containing parts shall
comply with the applicable legislation and shall be
suitable for refrigerant.
deoxidised seamless copper for refrigerant.

8.2. Piping material selection

CAUTION
Never use piping which has been used for previous
installations. Only use parts which are delivered with the
unit.
Foreign materials inside pipes (including oils for fabrication)
must be ≤0.014 grain/ft (30 mg/10 m).
Temper grade: use piping with temper grade in function of the
pipe diameter as listed in table below.
The pipe thickness of the refrigerant piping shall comply with the
applicable legislation. The minimal pipe thickness for R410A
piping must be in accordance with the table below.
Temper grade of
Pipe size piping material
1/4 inch (Ø6.4 mm)
5/8 inch (Ø15.9 mm)
O = Annealed
8.3. Refrigerant piping specifications
Refrigerant piping specifications
Maximum allowable piping length
between outdoor unit and indoor unit
Minimum required piping length
between outdoor unit and indoor unit
Maximum allowable height difference
between outdoor unit and indoor unit
Additional refrigerant required for
refrigerant pipe exceeding 32.8 ft (10 m)
in length
Gas pipe - outer diameter
Liquid pipe - outer diameter
Installation manual
7
by a
than
Use phosphoric acid
Minimal thickness
O 0.031 inch (0.8 mm)
O 0.039 inch (1.0 mm)
98.4 ft (30 m)
9.8 ft (3 m)
65.6 ft (20 m)
0.013 lbs/ft (20 g/m)
5/8 inch (15.9 mm)
1/4 inch (6.4 mm)
9. P
RECAUTIONS ON REFRIGERANT PIPING
CAUTION
R410A, as well as other refrigerants, should always be
recovered and never be released directly into the
environment.
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 –14.6 psi
[–100.7 kPa (5 Torr, –755 mm Hg)].
In order to prevent dirt, liquid or dust from entering the piping,
cure the piping with a pinch or taping.
Installation period
More than a month
Less than a month
Regardless of the period
- Great caution is needed when passing copper tubes through
walls.

9.1. Guidelines 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 2.9 psi (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.
Protection method
Pinch the pipe
Pinch or tape the pipe
3 4 5
6
ERLQ018~030BAVJU
Outdoor unit for air to water heat pump
4PW62590-1 – 07.2010