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REFRIGERANT PIPING TASKS
10
10-1. REFRIGERANT PIPING SYSTEM
10-1-1. MXZ-SM36NAM-U1
MXZ-SM42NAMHZ-U1
MXZ-SM48NAM-U1
Line-Branch Method
Connection Examples
(Connecting to 4 Indoor Units)
Total Piping Length
Permissible
Farthest Piping Length
Length
Farthest Piping Length After First Branch
High/Low Difference
Permissible High/
Low Difference
in Indoor/Outdoor Section
High/Low Difference in Indoor/Indoor Section
■
Selecting the Refrigerant Branch Kit
■
Select Each Section of Refrigerant Piping
(1) Section From Outdoor Unit
to First Branch (A)
(2) Sections From Branch to
Indoor Unit (a,b,c,d)
(3) Section From Branch to
Branch (B,C)
Select the size from the table to the right.
■
Additional refrigerant charge
Refrigerant for the extended piping is not included in the
outdoor unit when the unit is shipped from the factory.
Therefore, charge each refrigerant piping system with
additional refrigerant at the installation site. In addition, in
order to carry out service, enter the size and length of each
liquid pipe and additional refrigerant charge amounts in
the spaces provided on the "Refrigerant amount" plate on
the outdoor unit.
Calculation of additional refrigerant charge
• Calculate the additional charge using the liquid pipe size
and length of the extended piping and total capacity of
connected indoor units.
• Calculate the additional refrigerant charge using the
procedure shown to the right, and charge with the
additional refrigerant.
• For amounts less than 0.2 lb [0.1 kg], round up the
calculated additional refrigerant charge.
(For example, if the calculated charge is 13.2 lb [6.01 kg],
round up the charge to 13.4 lb [6.1 kg].)
OCH789
MXZ-SM36NAMHZ-U1
MXZ-SM48NAMHZ-U1
A
B
A+B+C+a+b+c+d [ 984 ft [300 meters]
(L)
A+B+C+d [ 492 ft [150 meters]
(R)
B+C+d [ 98 ft [30 meters]
The outdoor unit is upper: 164ft [50m] or less
(H)
The outdoor unit is lower: 131ft [40m] or less (98ft [30,] or less if PKFY-P06NBMU, PKFY-P08NHMU,
PKFY-P04/06/08/12NLMU, PFFY-P06/08/12NEMU, and PFFY-P06/08/12NRMU are included.)
(h)
49 ft [15 meters]
Use an optional branch piping kit (CMY-Y62-G-E).
(1) Refrigerant Piping Diameter In Section
From Outdoor Unit to First Branch
(Outdoor Unit Piping Diameter)
Model
Each
Section of
MXZ-SM36/42/48
Piping
(3) Refrigerant Piping Diameter In Section
From Branch to Branch
Liquid Line (inch [mm]) Gas Line (inch [mm])
3/8 [ø9.52]
<Additional Charge>
Calculation of refrigerant charge
Pipe size
Liquid pipe
ø6.35
[ft] × 0.21 [oz/ft]
(m) × 19.0 (g/m)
Included refrigerant amount when shipped from the factory
Included refrigerant amount
10 LBS. 9 OZ. (4.8 kg)
<Example>
Outdoor model : SM48
Indoor 1 : P24 (24 kBtu/h)
2 : P15 (15 kBtu/h)
3 : P08 (8 kBtu/h)
4 : P06 (6 kBtu/h)
The total length of each liquid line is as follows:
[3/8"] ø9.52 : A + B + C + a = 20 + 5 + 5 + 15 = 147 ft [45 m]
[1/4"] ø6.35 : b + c + d = 10 + 10 + 20 = 132 ft [40 m]
The total capacity of connected indoor unit is as follows:
24 + 15 + 08 + 06 = 53
<Calculation example>
Additional refrigerant charge
132 ft × 0.21 oz + 147 ft × 0.55 oz + 88 oz = 197 oz
A
L
R
B
C
a
b
c
C
C
C
(2) Refrigerant Piping Diameter In Section
Piping Diameter (inch [mm])
Liquid Line
3/8 [ø9.52]
Gas Line
5/8 [ø15.88]
5/8 [ø15.88]
Total capacity of
Pipe size
connected indoor units
Liquid pipe
+
+
– 27 kBtu/h
ø9.52
28 – 54 kBtu/h
[ft] × 0.55 [oz/ft]
(m) × 50.0 (g/m)
55 – 62 kBtu/h
A : ø9.52 66 ft [20 m]
B : ø9.52
16 ft [5 m]
C : ø9.52 16 ft [5 m]
a : ø9.52 49 ft [15 m]
b : ø6.35 33 ft [10 m]
c : ø6.35 33 ft [10 m]
d : ø6.35 66 ft [20 m]
[
40 ×
140
A
Outdoor Unit
B
First Branch
C
Indoor unit
d
C
From Branch to Indoor Unit
(Indoor Unit Piping Diameter)
Model number
Piping Diameter (inch [mm])
Liquid Line
1/4 [ø6.35]
– 18
Gas Line
1/2 [ø12.7]
Liquid Line
3/8 [ø9.52]
24 – 54
Gas Line
5/8 [ø15.88]
Amount for the
indoor units
53 oz (1.5 kg)
88 oz (2.5 kg)
106 oz (3.0 kg)
At the conditions
below:
19.0
50.0
+ 45 ×
+ 2.5 = 5.6 kg (rounded up)
1000
1000
]
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