Table des Matières
Publicité
Les langues disponibles
Les langues disponibles
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 addi-
tional 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 charg-
ing 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 Charge>
Additional
Liquid pipe size
refrigerant charge
Total length of
ø19.05 mm [3/4 in]
=
+
(m) × 0.29 (kg/m)
(kg) [oz]
(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)
<Example>
Indoor
1: 48 A: ø12.7 mm [1/2
] 40 m [131 ft] a: ø9.52 mm [3/8
in
2: 36 B: ø9.52 mm [3/8
] 10 m [32 ft] b: ø9.52 mm [3/8
in
3: 15 C: ø9.52 mm [3/8
] 15 m [49 ft] c: ø6.35 mm [1/4
in
4: 12 D: ø9.52 mm [3/8
] 10 m [32 ft] d: ø6.35 mm [1/4
in
5: 24
e: ø9.52 mm [3/8
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,
<Calculation example>
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 _
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 connec-
tion 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 refriger-
ant service valve and the pinched connecting pipe.
10
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]
(m) × 0.024 (kg/m)
(ft) × 0.26 (oz/ft)
] 10 m [32 ft]
in
At the
] 5 m [16 ft]
in
conditions
] 10 m [32 ft]
in
below:
] 10 m [32 ft]
in
] 10 m [32 ft]
in
_
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 refriger-
ant.
4 After completing 2 and 3 heat the brazed section to remove the pinched
connecting pipe.
[Fig. 10.2.1]
• P72
<A>
<B>
A
D
E
G
F
<A> Refrigerant service valve (liquid side/brazed type)
<B> Refrigerant service valve (gas side/brazed type)
A Shaft
Fully closed at the factory, when connecting the piping, and when vacuuming.
Open fully after these operations are completed.
<When opening>
• Turn the shaft counterclockwise with a hexagonal wrench.
• Turn around the shaft until it stops.
<When closing>
• Turn the shaft clockwise with a hexagonal wrench.
• Turn around the shaft until it stops.
B Shaft
Fully closed at the factory, when connecting the piping, and when vacuuming.
Open fully after these operations are completed.
<When opening>
• Turn the shaft counterclockwise.
• Turn around the shaft until it stops.
<When closing>
• Turn the shaft clockwise.
• Turn around the shaft until it stops.
C Stopper pin
Prevents the shaft from turning 90˚ or more.
D Service port
Available for gas venting of the pinched connecting pipe, or vacuuming in the
refrigerant pipes on the site.
E Cap
Remove the cap before operating the shaft. Be sure to return it to the original
position after completing the operation.
F Pinched connecting pipe severing portion
G Pinched connecting pipe brazing portion
Warning:
•
The sections between the refrigerant service valves and the pinched con-
necting 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 connect-
ing 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:
•
Place 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
<B>
<A>
D
B
O
S
A
C
D
E
G
F
Publicité
Chapitres
Table des Matières
