Additional Refrigerant Charge - Mitsubishi Electric MXZ-8C48NA Manuel D'installation

5. Installing the refrigerant piping
Flared connections
unit sides.

5.3. Additional refrigerant charge

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 addi-
tional 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
tended piping and total capacity of connected indoor units.
and charge with the additional refrigerant.
charge.
(For example, if the calculated charge is 6.01 kg, round up the charge to 6.1 kg.)
A
B
2 branches pipe (joint)
: optional parts.
A A
A
B B
Fig. 5-2
(1) Valve size for outdoor unit
For liquid
For gas
(2) Valve size for branch box
Liquid pipe
A
Gas pipe
Liquid pipe
B
Gas pipe
Liquid pipe
C
Gas pipe
Liquid pipe
D
Gas pipe
Liquid pipe
E
Gas pipe
* 3-branch type : only A, B, C unit
A
Fig. 5-3
1)
-
Branch box
B B B
Branch box #1
B B
Branch box #2
ø9.52 mm (3/8 inch)
ø15.88 mm (5/8 inch)
ø6.35 mm (1/4 inch)
ø9.52 mm (3/8 inch)
ø6.35 mm (1/4 inch)
ø9.52 mm (3/8 inch)
ø6.35 mm (1/4 inch)
ø9.52 mm (3/8 inch)
ø6.35 mm (1/4 inch)
ø9.52 mm (3/8 inch)
ø6.35 mm (1/4 inch)
ø12.7 mm (1/2 inch)
Conversion formula
1/4 F ø6.35 (1/4)
3/8 F ø9.52 (3/8)
1/2 F ø12.7 (1/2)
B
5/8 F ø15.88 (5/8)
3/4 F ø19.05 (3/4)
<Additional Charge>
Calculation of refrigerant charge
Liquid pipe Liquid pipe
+
ø6.35 ø9.52
Included refrigerant amount when shipped from the factory
Included refrigerant amount
4.8 kg (10 lbs, 9 oz)
Indoor 1 : model 24
2 : model 15
3 : model 09
4 : model 09
The total length of each liquid line is as follows:
ø9.52 : A + a = 30 + 15 = 45 m (148 ft)
ø6.35 : b + c + d = 10 + 10 + 20 = 40 m (131 ft)
The total capacity of connected indoor unit is as follows:
24 + 15 + 09 + 09 = 57
Additional refrigerant charge
19.0 50.0
+ 45 ×
40 ×
1000 1000
(131 × 0.21 + 148 × 0.55 + 106 = 215 oz)
Conversion formula
A
ø9.52 mm
Liquid
(3/8 inch)
B
ø15.88 mm
Gas
(5/8 inch)
Connected pipes diameter
Model name
mm (inch)
MAC-A454JP
MAC-A455JP
MAC-A456JP
B
PAC-493PI
PAC-SG76RJ-E
Piping preparation
1
Outside diameter Insulation thickness
mm (inch)
6.35 (1/4)
9.52 (3/8)
12.7 (1/2)
15.88 (5/8)
2 Ensure that the 2 refrigerant pipes are insulated to prevent condensation.
3 Refrigerant pipe bending radius must be 4" (100 mm) or more.
Caution:
thickness may cause dew drippage.
you can choose the favorite one.
Model name
MSDD-50AR-E
MSDD-50BR-E
Refer to the installation manuals of MSDD-50AR-E and MSDD-50BR-E.
Total capacity of Amount for the
connected indoor units
+
– 27 1.5 kg (53 oz)
28 – 54 2.5 kg (88 oz)
55 – 62 3.0 kg (106 oz)
a : ø9.52 15 m (49 ft)
At the conditions
b : ø6.35 10 m (33 ft)
below:
c : ø6.35 10 m (33 ft)
d : ø6.35 20 m (66 ft)
+ 3.0 = 6.1 kg (rounded up)
B
The piping connection size differs according to
the type and capacity of indoor units. Match the
piping connection size of branch box with indoor
unit.
If the piping connection size of branch box does
not match the piping connection size of indoor
unit, use optional different-diameter (deformed)
joints to the branch box side. (Connect deformed
joint directly to the branch box side.)
Diameter A
mm (inch)
ø9.52 (3/8)
ø12.7 (1/2)
ø12.7 (1/2)
ø6.35 (1/4)
ø9.52 (3/8)
Insulation material
mm (inch)
8 (5/16)
8 (5/16)
Heat resisting foam plastic 0.045
8 (5/16)
8 (5/16)
Connection method
brazing
indoor units
Diameter B
mm (inch)
ø12.7 (1/2)
ø9.52 (3/8)
ø15.88 (5/8)
ø9.52 (3/8)
ø15.88 (5/8)
7