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5.2.2
Additional installation site requirements
of the outdoor unit in cold climates
Protect the outdoor unit against direct snowfall and take care that the
outdoor unit is NEVER snowed up.
c
a
Snow cover or shed
b
Pedestal (minimum height=150 mm)
c
Prevailing wind direction
d
Air outlet
5.3
Preparing refrigerant piping
5.3.1
Refrigerant piping requirements
INFORMATION
Also read the precautions and requirements in the
"General safety precautions" chapter.
When connecting multiple indoor units to the outdoor unit, mind the
following:
Refrigerant branch kit One or more refrigerant branch kits are
required. See
outdoor unit" on
Upward and
Perform upward and downward piping only
downward piping
on the main piping line (L1).
Branch pipes
▪ Install the branch pipes horizontally (with a
maximum inclination of 15°) or vertically.
▪ Make the length of the branch pipes to the
indoor units as short as possible.
▪ Try to keep length of the branch pipes to
the indoor units equal.
Definitions: L1~L7, H1, H2
(a)
Pair
L1
RZASG71~140M_V1+Y1
Sky Air Advance-series
4P486047-1 – 2017.04
a
c
b
"4.3.1 Possible options for the
page 7.
(a)
Twin
L2
L3
L1
(a)
Triple
L2
L3
L4
L1
(a)
Assume that the longest line in the illustration corresponds
with the actual longest pipe, and the highest unit in the
illustration corresponds with the actual highest unit.
L1
Main piping
L2~L7
Branch piping
H1
Height difference between the highest indoor unit and the
outdoor unit
H2
Height difference between the highest and the lowest
indoor unit
Refrigerant branch kit
Refrigerant piping material
▪ Piping material: Phosphoric acid deoxidised seamless copper.
▪ Piping temper grade and thickness:
Outer diameter
Temper grade
(Ø)
6.4 mm (1/4")
Annealed (O)
9.5 mm (3/8")
12.7 mm (1/2")
15.9 mm (5/8")
Annealed (O)
19.1 mm (3/4")
Half hard (1/2H)
(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.
▪ Flare connections: Only use annealed material.
Refrigerant piping diameter
The refrigerant piping diameters must comply with the following:
Piping
L1 (pair, twin, triple, double twin) See below.
L2,L3 (twin)
L2~L4 (triple)
L4~L7 (double twin)
L2,L3 (double twin)
L1 (pair, twin, triple, double twin):
(a)
Model
New
/
(b)
Existing
RZASG71
Standard
RZASG100~140 Standard
(a)
When installing new piping, use the same diameters as
the connections on the outdoor units (i.e. standard
diameters for liquid and gas piping).
(b)
When reusing existing piping, you may use the size‑up or
size‑down diameters, but then capacity might decrease,
and stricter piping length requirements are applicable.
Assess these limitations in relation to the complete
installation.
5 Preparation
(a)
Double twin
L4
L2
L5
L6
L3
L7
L1
(a)
Thickness (t)
Ø
≥0.8 mm
t
≥1.0 mm
Diameter
Use the same diameters as the
connections (liquid, gas) on the
indoor units.
Liquid piping: Ø9.5 mm
Gas piping: Ø15.9 mm
L1 liquid
L1 gas piping
piping
Ø9.5 mm
Ø15.9 mm
Ø9.5 mm
Ø15.9 mm
Installer reference guide
9
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