RXYSQ6P8Y1B9
VRVIII-S System air conditioner
4P357505-1 – 2013.08
Installation manual
7
2.
In case of installing multiple units (2 units or more) in lateral
connection per row.
Relation of dimensions between H, A and L is shown in the table
below.
8.
Refrigerant pipe size and allowable
pipe length
To persons in charge of piping work:
Be sure to open the stop valve after piping installing and
vacuuming is complete. (Running the system with the valve
closed may break the compressor.)
It is forbidden to discharge refrigerant into the atmosphere.
Collect the refrigerant in accordance with the freon collection
and destruction law.
Do not use flux when brazing the refrigerant piping.
For brazing, use phosphor copper brazing filler metal (BCuP)
which does not require a flux.
(If a chlorine flux is used, the piping will corrode, and if the flux
contains fluoride, it will cause the coolant oil to deteriorate,
adversely affecting the coolant piping system.
8.1.
Selection of piping material
Foreign materials inside pipes (including oils for fabrication)
must be
≤
30 mg/10 m.
Construction material: phosphoric acid deoxidized seamless
copper for refrigerant.
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 should comply with
relevant local and national regulations. The minimal pipe
thickness for R410A piping must be in accordance with the table
below.
O = Annealed
1/2H = Half hard
Make sure to use the particular branches of piping that have
been selected.
In case the required pipe sizes (inch sizes) are not available, it is
also allowed to use other diameters (mm sizes), taken the
following into account:
select the pipe size nearest to the required size.
use the suitable adapters for the change-over from inch to
mm pipes (field supply).
9.
Precautions 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).
In order to prevent dirt, liquid or dust from entering the piping,
cure the piping with a pinch or taping.
Great caution is needed when passing copper tubes through
walls.
For handling of stop valves, refer to "10.3. How to use the stop
valve" on page 9.
Only use the flare nuts included with the unit. Using different
flare nuts may cause the refrigerant to leak.
Always use the supplied copper gasket when connecting the
gas pipe supplied with the unit. See "10. Refrigerant piping" on
page 8.
9.1.
Cautions for brazing
Be sure to carry out a nitrogen blow when brazing.
Brazing without carrying out nitrogen replacement or releasing
nitrogen into the piping will create large quantities of oxidized
film on the inside of the pipes, adversely affecting valves and
compressors in the refrigerating system and preventing normal
operation.
L
A
L
≤
H
0<L
≤
1/2H
250
1/2H<L
≤
H
300
H<L
Installation impossible
WARNING
All field piping must be installed by a licensed refrigeration
technician and must comply with relevant local and
national regulations.
Pipe Ø
Temper grade of piping
material
Minimal thickness t
(mm)
6.4 / 9.5 / 12.7
O
0.80
15.9
O
1
19.1
1/2H
1
1500
600
3000
A
H
L
Installation period
Protection method
More than a month
Pinch the pipe
Less than a month
Pinch or tape the pipe
Regardless of the
period
4P357505-1.book Page 7 Tuesday, September 10, 2013 7:59 AM
