MXZ-SM42NAMHZ Service Manual

143
OCH789
Line-Branch Method
Connection Examples
(Connecting to 4 Indoor Units)
Liquid Line
Gas Line
Piping Diameter (inch[mm]) Model
Liquid Line (inch[mm]) Gas Line (inch[mm])
3/4 [ø19.05]3/8 [ø9.52]
Liquid Line
Gas Line
Liquid Line
Gas Line
Liquid Line
Gas Line
Piping Diameter (inch[mm])
Model number
– 18
24 – 54
72
1/4 [ø6.35]
1/2 [ø12.7]
3/8 [ø9.52]
5/8 [ø15.88]
3/8 [ø9.52]
3/4 [ø19.05]
Outdoor Unit
First Branch
Indoor unit
A
B
C
A+B+C+a+b+c+d [ 492 ft [150 meters]
A+B+C+d [ 262 ft [80 meters]
B+C+d [ 98 ft [30 meters]
164 ft [50 meters] (If the outdoor unit is lower, 131 ft [40 meters])
49 ft [15 meters]
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)
(R)
(H)
(h)
■ Selecting the Refrigerant Branch Kit
■ Select Each Section of Refrigerant Piping
■ Additional refrigerant charge
Select the size from the table to the right.
(1) Refrigerant Piping Diameter In Section
From Outdoor Unit to First Branch
(Outdoor Unit Piping Diameter)
(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)
(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)
Each
Section of
Piping
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].)
3/8 [ø9.52]
3/4 [ø19.05]
MXZ-SM60
B
A
A
H
B C
L
R
d
a
h
b c
C
C
C C
Pipe size
Liquid pipe
+
Pipe size
Liquid pipe
ø6.35 ø9.52
[ft] × 0.29 [oz/ft]
(m) × 27.0 (g/m)
[ft] × 0.75 [oz/ft]
(m) × 70.0 (g/m)
<Additional Charge>
Calculation of refrigerant charge
+
Total capacity of
connected indoor units
Amount for the
indoor units
– 27 kBtu/h 53 oz (1.5 kg)
28 – 54 kBtu/h 88 oz (2.5 kg)
55 – 78 kBtu/h 106 oz (3.0 kg)
Included refrigerant amount when shipped from the factory
Included refrigerant amount
[ 40 ×
27.0
+ 45 ×
70.0
+ 2.5 = 6.8 kg (rounded up)
]
1000 1000
<Example>
Outdoor model : P60
Indoor 1 : P24 (24 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]
2 : P15 (15 kBtu/h)
b : ø6.35 33 ft [10 m]
3 : P08 (8 kBtu/h)
c : ø6.35 33 ft [10 m]
4 : P06 (6 kBtu/h)
d : ø6.35 66 ft [20 m]
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
At the conditions
below:
11 LBS. 4 OZ. (5.1 kg)
132 ft × 0.29 oz + 147 ft × 0.75 oz + 88 oz = 237 oz
10-1-2. MXZ-SM60NAM-U1