Installation manual
4
250C7Y1B
Split system air conditioner
4PW34720-1G – 07.2010
PRECAUTION
Block all gaps in the holes for passing out piping and wiring using
sealing material (field supply). (Small animals may enter the
machine.)
Example: passing piping out through the front.
(See figure 10)
7. R
EFRIGERANT
PIPING
7.1.
Selection of piping material
■
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
7.2.
Refrigerant pipe size
Refer to
figure 9
for twin system, to
figure 12
for triple system and to
figure 13
for double twin system.
■
Main pipe (pipe between outdoor and first branch).
The pipes should have the same size as the outdoor
connections.
■
Pipe between first branch and second branch (L2+L3) (only for
double twin).
■
Pipe between last branch and indoor units (L2~L3 for twin,
L2~L4 for triple and L4~L7 for double twin).
These pipe sizes must have the same size as the connected
indoor units pipe sizes. Branch: see marking '
■
' on figures
9
,
12
and
13
.
■
Prepare a water drainage channel around the
foundation to drain waste water from around the unit.
■
If the unit is to be installed on a roof, check the
strength of the roof and its drainage facilities first.
■
If the unit is to be installed on a frame, install the
waterproofing board within a distance of 150 mm
under the unit in order to prevent infiltration of water
coming from under the unit.
■
When installed in a corrosive
environment, use a nut with a
resin clip plate (1) to protect the
nut tightening part from rust.
1
Plug the areas marked with "
".
(When the piping is routed from the front panel.)
2
Gas side piping
3
Liquid side piping
Use R410A to add refrigerant.
All field piping must be installed by a licensed refrigeration
technician and must comply with relevant local and
national regulations.
CAUTION TO BE TAKEN WHEN BRAZING
REFRIGERANT PIPING
■
Do not use flux when brazing copper-to-copper
refrigerant piping. (Particularly for the HFC refrigerant
piping) Therefore, use the phosphor copper brazing
filler metal (BCuP) which does not require flux.
Flux has extremely harmful influence on refrigerant
piping systems. For instance, if the chlorine based flux is
used, it will cause pipe corrosion or, in particular, if the
flux contains fluorine, it will damage the refrigerant oil.
■
Be sure to perform a nitrogen blow when brazing.
(Brazing without performing 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.)
■
After completing the installation work, check that the
refrigerant gas does not leak.
Toxic gas may be produced if the refrigerant gas leaks
into the room and when it comes in contact with a
source of fire.
If any leak would happen:
•
ventilate the area immediately.
•
do not directly touch the refrigerant that leaks.
Frostbite may be caused.
NOTE
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 such as SUNISO
and moisture) from mixing into the system.
(The screw specifications differ for R410A and
R407C.)
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.
1
Pipe Ø
Temper grade
of piping material
Minimal thickness t (mm)
9.5 / 12.7
O
0.80
15.9
O
1.00
22.2
1/2H
1.00
Refrigerant pipe size
(1)
(1) In case of twin, triple and double twin applications, the listed refrigerant
pipe sizes relate to the main pipes only. (L1 = the pipes between the
outdoor unit and the branch in figures
9
,
12
and
13
).
Model
Standard size
Size-up
RZQ200
Gas pipe
Ø22.2
Ø25.4
Liquid pipe
Ø9.5
Ø12.7
RZQ250
Gas pipe
Ø22.2
Ø25.4
Liquid pipe
Ø12.7
Ø15.9
Liquid
Ø9.5
Gas
Ø15.9
NOTE
■
For new installations, use the standard pipe sizes.
■
When using existing pipes, size-up is allowed as
mentioned in the table above.
Size up is only allowed for pair combination (L1).
Additional restrictions towards allowable pipe
lenghts, as mentioned in the table
"Allowable pipe
length" on page 5
, must be taken into account.
Not using the standard pipe size may result in
capacity decrease. The installer must
acknowledge this and judge this very carefully in
function of the complete installation.
