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10. Additional refrigerant charge
At the time of shipping, the outdoor unit is charged with refrigerant.
This charge does not include the amount needed for extended piping and
additional charging of each refrigerant line will be required on site. In order that
future servicing may be properly provided, always keep a record of the size and
length of each refrigerant line and the amount of additional charge by writing it in
the space provided on the outdoor unit.
10.1. Calculation of additional refrigerant
charge
•
Calculate the amount of additional charge based on the length of the piping
extension and the size of the refrigerant line.
•
Use the table below as a guide for calculating the amount of additional
charging and then charge the system accordingly.
•
If the calculation results in a fraction of less than 0.1 kg [4 oz], round up to the
next 0.1 kg [4 oz]. For example, if the result of the calculation was 12.38 kg
[437 oz], round the result up to 12.4 kg [438 oz].
Additional
Liquid pipe size
refrigerant charge
Total length of
ø19.05 mm [3/4 in]
=
(kg) [oz]
(m) × 0.29 (kg/m)
(ft) × 3.12 (oz/ft)
Liquid pipe size
Total length of
ø9.52 mm [3/8 in]
+
(m) × 0.06 (kg/m)
(ft) × 0.65 (oz/ft)
Indoor
1: 48 A : ø12.7 mm [1/2 in] 40 m [131 ft] a : ø9.52 mm [3/8 in] 10 m [32 ft]
2: 36 B : ø9.52 mm [3/8 in] 10 m [32 ft] b : ø9.52 mm [3/8 in] 5 m [16 ft]
3: 15 C : ø9.52 mm [3/8 in] 15 m [49 ft] c : ø6.35 mm [1/4 in] 10 m [32 ft]
4: 12 D : ø9.52 mm [3/8 in] 10 m [32 ft] d : ø6.35 mm [1/4 in] 10 m [32 ft]
5: 24
The total length of each liquid line is as follows:
ø12.7 mm [1/2 in]: A = 40 m [131 ft] = 40 m [131 ft]
ø9.52 mm [3/8 in]: B + C + D + a + b + e
= 10 m [32 ft] + 15 m [49 ft] + 10 m [32 ft] + 10 m [32 ft] +
5 m [16 ft] + 10 m [32 ft] = 60 m [193 ft]
ø6.35 mm [1/4 in]: c + d = 10 m [32 ft] + 10 m [32 ft] = 20 m [64 ft]
Therefore,
Additional refrigerant charge
= 40 m [131 ft] × 0.12 kg/m [1.30 oz/ft] + 60 m [193 ft] × 0.06 kg/m [0.65 oz/ft]
+ 20 m [64 ft] × 0.024 kg/m [0.26 oz/ft] + 3.5 kg [124 oz] = 12.4 kg [438 oz]
Value of α
Total capacity of connecting indoor units
Models
~
27
Models
28 ~
54
Models
55 ~ 126
Models 127 ~ 144
Models 145 ~ 180
Models 181 ~ 234
Models 235 ~
10.2. Precautions concerning piping
connection and valve operation
•
Conduct piping connection and valve operation accurately and carefully.
• Removing the pinched connecting pipe
When shipped, a pinched connecting pipe is attached to the on-site liquid
and gas valves to prevent gas leakage.
Take the following steps 1 through 4 to remove the pinched connecting
pipe before connecting refrigerant pipes to the outdoor unit.
1 Check that the refrigerant service valve is fully closed (turned clockwise
all the way).
2 Connect a charging hose to the service port on the liquid/gas refrigerant
service valve, and extract the gas in the pipe section between the
refrigerant service valve and the pinched connecting pipe.
Liquid pipe size
Liquid pipe size
Total length of
Total length of
+
ø15.88 mm [5/8 in]
ø12.7 mm [1/2 in]
+
(m) × 0.2 (kg/m)
(m) × 0.12 (kg/m)
(ft) × 2.16 (oz/ft)
(ft) × 1.30 (oz/ft)
Liquid pipe size
Total length of
+
ø6.35 mm [1/4 in]
+ α
(m) × 0.024 (kg/m)
(ft) × 0.26 (oz/ft)
At the
conditions
below:
e : ø9.52 mm [3/8 in] 10 m [32 ft]
α
2.0 kg [71 oz]
2.5 kg [89 oz]
3.0 kg [106 oz]
3.5 kg [124 oz]
4.5 kg [160 oz]
5.0 kg [177 oz]
6.,0 kg [212 oz]
3 After vacuuming gas from the pinched connecting pipe, sever the
pinched connecting pipe at the location shown in [Fig.10.2.1] and drain
the refrigerant.
4 After completing 2 and 3 heat the brazed section to remove the
pinched connecting pipe.
[Fig. 10.2.1]
• P72
D
G
Refrigerant service valve (gas side/brazed type)
Shaft
A
Fully closed at the factory, when connecting the piping, and when
vacuuming. Open fully after these operations are completed.
• Turn the shaft counterclockwise with a hexagonal wrench.
• Turn around the shaft until it stops.
• Turn the shaft clockwise with a hexagonal wrench.
• Turn around the shaft until it stops.
Shaft
B
Fully closed at the factory, when connecting the piping, and when
vacuuming. Open fully after these operations are completed.
• Turn the shaft counterclockwise.
• Turn around the shaft until it stops.
• Turn the shaft clockwise.
• Turn around the shaft until it stops.
Stopper pin
C
Prevents the shaft from turning 90˚ or more.
Service port
D
Available for gas venting of the pinched connecting pipe, or vacuuming in the
refrigerant pipes on the site.
Cap
E
Remove the cap before operating the shaft. Be sure to return it to the original
position after completing the operation.
Pinched connecting pipe severing portion
F
Pinched connecting pipe brazing portion
G
Warning:
•
The sections between the refrigerant service valves and the pinched
connecting pipes are filled with gas and refrigerant oil. Extract the gas
and refrigerant oil in the above-mentioned pipe section before heating
the brazed section to remove the refrigerant service valve pinched
connecting pipe.
- If the brazed section is heated without first extracting the gas and
refrigerant oil, the pipe may burst or the pinched connecting pipe may blow
off and ignite the refrigerant oil, causing serious injury.
Caution:
•
Pl
ace a wet towel on the refrigerant service valve before heating the
brazed section to keep the temperature of the valve from exceeding
120 ˚C [248 ˚F].
•
Direct the flame away from the wiring and metal sheets inside the unit
to prevent heat damage.
• P96
A
D
O
S
A
E
E
G
F
11
B
C
D
F
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