Daikin VRV IV-S, Инструкция по установке и эксплуатации

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5 Preparation
Installer and user reference guide
12
RXYSQ8~12TMY1B
VRV IV-S system air conditioner
4P404225-1B – 2016.03
b
a
a Direction of the refrigerant flow
b Room where refrigerant leak has occurred (outflow of all
the refrigerant from the system)
Pay special attention to places, such as basements etc., where
refrigerant can stay, since refrigerant is heavier than air.
To check the maximum concentration level
Check the maximum concentration level in accordance with steps 1
to 4 below and take whatever action is necessary to comply.
1 Calculate the amount of refrigerant (kg) charged to each system
separately.
Formula A+B=C
A Amount of refrigerant in a single unit system
(amount of refrigerant with which the system
is charged before leaving the factory)
B Additional charging amount (amount of
refrigerant added locally in accordance with
the length or diameter of the refrigerant
piping)
C Total amount of refrigerant (kg) in the
system
NOTICE
Where a single refrigerant facility is divided into 2 entirely
independent refrigerant systems, use the amount of
refrigerant with which each separate system is charged.
2 Calculate the volume of the room (m
3
) where the indoor unit is
installed. In a case such as the following, calculate the volume
of (D), (E) as a single room or as the smallest room.
D Where there are no smaller room divisions:
E Where there is a room division, but there is an opening
between the rooms sufficiently large to permit a free
flow of air back and forth.
a
b
a Opening between the rooms
b Partition (Where there is an opening without a door
or where there are openings above and below the door
which are each equivalent in size to 0.15% or more of
the floor area.)
3 Calculate the refrigerant density using the results of the
calculations in steps 1 and 2 above. If the result of the above
calculation exceeds the maximum concentration level, a
ventilation opening to the adjacent room shall be made.
Formula F/G≤H
F Total volume of refrigerant in the refrigerant
system
G Size (m
3
) of smallest room in which there is
an indoor unit installed
H Maximum concentration level (kg/m
3
)
4 Calculate the refrigerant density taking the volume of the room
where the indoor unit is installed and the adjacent room. Install
ventilation openings in the door of adjacent rooms until the
refrigerant density is smaller than the maximum concentration
level.
5.3 Preparing refrigerant piping
5.3.1 Refrigerant piping requirements
INFORMATION
Also read the precautions and requirements in the
"General safety precautions" chapter.
NOTICE
The refrigerant R410A requires strict cautions for keeping
the system clean, dry and tight.
▪ Clean and dry: foreign materials (including mineral oils
or moisture) should be prevented from getting mixed
into the system.
▪ Tight: R410A does not contain any chlorine, does not
destroy the ozone layer, and does not reduce earth's
protection against harmful ultraviolet radiation. R410A
can contribute slightly to the greenhouse effect if it is
released. Therefore we should take special attention to
check the tightness of the installation.
NOTICE
The piping and other pressure-containing parts shall be
suitable for refrigerant. Use phosphoric acid deoxidised
seamless copper for refrigerant.
▪ Foreign materials inside pipes (including oils for fabrication) must
be ≤30 mg/10 m.
5.3.2 Refrigerant piping material
▪ Piping material: Phosphoric acid deoxidised seamless copper.
▪ Piping temper grade and thickness:
Outer diameter
(Ø)
Temper grade Thickness (t)
(a)
6.4 mm (1/4")
9.5 mm (3/8")
12.7 mm (1/2")
Annealed (O) ≥0.80 mm
t
Ø
15.9 mm (5/8") Annealed (O) ≥0.99 mm
19.1 mm (3/4")
22.2 mm (7/8")
Half hard (1/2H) ≥0.80 mm
25.4 mm (1") Half hard (1/2H) ≥0.88 mm
28.6 mm (1‑1/8") Half hard (1/2H) ≥0.99 mm
(a) Depending on the applicable legislation and the unit's
maximum working pressure (see "PS High" on the unit
name plate), larger piping thickness might be required.