Daikin SV1A25AJV1B - Installation Limitations; Piping Installation Limitation; Preparing Refrigerant Piping; Refrigerant Piping Requirements

14 Piping installation
Installation and operation manual
31
SV1A25AJV1B+SV4~8A14AJV1B
VRV 5 safety valve unit
4P709466-1 – 2023.09
14.1 Installation limitations
The illustration and table below show the installation limitations.
g
a
f
e
b
c
g
g
d
g
g
g
g
g g
a, b See table below.
c Maximum limit of 16 downstream ports of SV units in
refrigerant flow-through. Unused ports must also be
counted. E.g. 16ports=SV8A+SV4A+SV4A.
d At least one indoor unit must be connected to a SV unit
(SV6A and SV8A: always start from one of the first four
ports).
e Combine two ports when indoor unit capacity is over 140
except when SV1A is used. Refer to the table below.
f Direct connection to the outdoor unit. See the installation
and operation manual of the outdoor unit.
g SV unit
Description Model
SV1 SV4 SV6 SV8
Maximum number of connectable indoor units
per SVunit (a)
5 20 30 40
Maximum number of connectable indoor units
per SVunit branch (b)
5
Maximum capacity index of connectable
indoor units per SVunit (a)
250 400 600 650
Maximum capacity index of connectable
indoor units per branch (b)
250 140
Maximum capacity index of connectable
indoor units per branch if two branches are
combined (e)
— 250
Maximum capacity index of indoor units
connected to SV units in refrigerant flow-
through (c)
650
Maximum number of allowable SVunits in
refrigerant flow-through (c)
4
Maximum number of ports of SVunits in
refrigerant flow-through (c)
16
Maximum number of indoor units connected to
SVunits in refrigerant flow-through (c)
64
14.1.1 Piping installation limitation
In case of models SV6A and SV8A: at least one of the first four ports
of the SV unit MUST be connected. In case none of the first four
ports are connected, the 7-segment display will show ' '.
ABCDEFGH
0× 1× 2× 3× 4×
Model Branch pipe port
A B C D E F G H
SV6A ≥1port MUST be connected free use
SV8A free use
14.2 Preparing refrigerant piping
14.2.1 Refrigerant piping requirements
NOTICE
The piping and other pressure-containing parts shall be
suitable for refrigerant. Use phosphoric acid deoxidised
seamless copper for refrigerant piping.
▪ Foreign materials inside pipes (including oils for fabrication) must
be ≤30mg/10m.
14.2.2 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
28.6mm (11/8") Half hard (1/2H) ≥0.99mm
(a)
Depending on the applicable legislation and the maximum
working pressure of the unit (as indicated on the unit nameplate),
larger piping thickness might be required.
14.2.3 Refrigerant piping insulation
▪ Use polyethylene foam as insulation material:
▪ with a heat transfer rate between 0.041 and 0.052W/mK (0.035
and 0.045kcal/mh°C)
▪ with a heat resistance of at least 120°C
▪ Insulation thickness:
Ambient
temperature
Humidity Minimum thickness
≤30°C 75% to 80% RH 15mm