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11 REFRIGERANT PIPING TASKS
Line-Branch Method
Connection Examples
(Connecting to 4 Indoor Units)
Liquid Line
Gas Line
Piping Diameter (mm [inch])
Model
PUMY-P36,48
Liquid Line (mm [inch]) Gas Line (mm [inch])
W15.88 [5/8]W9.52 [3/8]
Liquid Line
Gas Line
Liquid Line
Gas Line
Piping Diameter (mm [inch])
Model number
18 or lower
24 to 54
W6.35 [1/4]
W12.7 [1/2]
W9.52 [3/8]
W15.88 [5/8]
Outdoor Unit
First Branch
Indoor unit
A
B
C
A+B+C+a+b+c+d 120m [394ft]
A+B+C+d 80m [262ft]
B+C+d 30m [100ft]
50 meters [164ft] or less (If the outdoor unit is lower, 20 meters [70ft] or less)
12 meters [39ft] or less
Use an optional branch piping kit (CMY-Y62-G-E).
Total Piping Length
Farthest Piping Length
Farthest Piping Length After First Branch
High/Low Difference in Indoor/Outdoor Section
High/Low Difference in Indoor/Indoor Section
Permissible
Length
Permissible High/
Low Difference
(L)
(1)
(H)
(h)
■
Selecting the Refrigerant Branch Kit
■
Select Each Section of Refrigerant Piping
■
Additional refrigerant charge
Select the size from the right table.
(1) Refrigerant Piping Diameter In Section
From Outdoor Unit to First Branch
(Outdoor Unit Piping Diameter)
(1) Section From Oudoor Unit
to First Branch (A)
(2) Sections From Branch to
Indoor Unit (a,b,c,d)
(3) Section From Branch to
Branch (B,C)
(3) Refrigerant Piping Diameter In Section
From Branch to Branch
(2) Refrigerant Piping Diameter In Section
From Branch to Indoor Unit
(Indoor Unit Piping Diameter)
<Additional Charge>
<Example>
Outdoor model : P48
Indoor
1 : P24 A : W9.52 [3/8"] 10 m [33 ft] a : W9.52 [3/8"] 15m [49 ft]
2 : P15 B : W9.52 [3/8"] 10 m [33 ft] b : W6.35 [1/4"] 10m [33 ft]
3 : P08 C : W9.52 [3/8"] 10 m [33 ft] c : W6.35 [1/4"] 10m [33 ft]
4 : P06 d : W6.35 [1/4"] 20m [66 ft]
The total length of each liquid line is as follows;
W9.52 [3/8"] :
A + B + C + a = 10 m + 10 m + 10 m + 15 m = 45 m [33 ft + 33 ft + 33 ft + 49 ft = 148 ft]
W6.35 [1/4"] : b + c + d = 10 m +10 m + 20 m = 40 m [33 ft + 33 ft + 66 ft = 132 ft]
<Calculation example>
Additional
refrigerant charge = 45 m × 0.06 kg + 40 m × 0.024 kg – 3.0 kg = 0.7kg (rounded up)
= [148 ft × 0.041 lbs + 132 ft × 0.016 lbs – 6.6 lbs = 1.58 lbs]
Additional
refrigerant charge
[lbs]
(kg)
Liquid pipe size
Total length of
W9.52
× 0.06 kg
[3/8"
× 0.041 lbs]
=
Liquid pipe size
Total length of
W6.35
× 0.024 kg
[1/4"
× 0.016 lbs]
(m)
× 0.06 (kg/m),
[ft]
× 0.041 [lbs/ft]
(m)
× 0.024 (kg/m),
[ft]
× 0.016 [lbs/ft]
+
Refrigerant
amount for outdoor
unit
3.0kg
[6.6 lbs]
–
At the
conditions
below:
W9.52 [3/8]
W15.88 [5/8]
• Refrigerant of 3kg [6.6 lbs] equivalent to 50m
[165 ft] total extended piping length is already
included when the outdoor unit is shipped.
Thus, if the total extended piping length is
50m [165 ft] or less, there is no need to
charge with additional refrigerant.
• If the total extended piping length exceeds
50m [165 ft], calculate the required additional
refrigerant charge using the procedure
shown on the right.
• If the calculated additional refrigerant charge
is a negative amount, do not charge with any
refrigerant.
A
H
B C
L
1
d
a
h
b c
11-1. REFRIGERANT PIPING SYSTEM