Additional Refrigerant Charge; Calculation Of Additional Refrigerant Charge - Mitsubishi Electric Y Series Installation Manual

<C> Slope of twinning pipes
Make sure the slope of the twinning pipes are at an angle within ±15˚ to the ground.
If the slope exceeds the specified angle, the unit may be damaged.
G
<D> Pipe connection example
H
A Downward slope B Upward slope
F Twinning pipe G Slope of the twinning pipes are at an angle within ±15˚ to the ground
I Twinning Kit J Straight run of pipe that is 500 mm or more

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, round up to the next
0.1 kg. For example, if the result of the calculation was 12.38 kg, round the
result up to 12.4 kg.
<Additional charge>
Additional Total length of
refrigerant charge liquid pipe sized
=
ø19.05 mm
(kg) [oz] (m) × 0.29 (kg/m)
Total length of
liquid pipe sized
+
ø9.52 mm
(m) × 0.06 (kg/m)
Additional charge
Outdoor unit model
P200
P250
+
P300
P350
P400
P450
P500
<Example>
Indoor
1: 125 A : ø12.7 mm 40 m
2: 100 B : ø9.52 mm 10 m
3: 40 C : ø9.52 mm 15 m
4: 32 D : ø9.52 mm 10 m
5: 64
14
F
I
H
J
C Indoor unit
Total length of Total length of
liquid pipe sized liquid pipe sized
+
+
ø15.88 mm ø12.7 mm
(m) × 0.2 (kg/m) (m) × 0.12 (kg/m)
Total length of
liquid pipe sized
+
ø6.35 mm
(m) × 0.024 (kg/m)
Charged amount
-
-
+ α
-
-
-
-
6.0 kg
a : ø9.52 mm 10 m
At the
b : ø9.52 mm 5 m
conditions
c : ø6.35 mm 10 m
d : ø6.35 mm 10 m below:
e : ø9.52 mm 10 m
D Trap (gas pipe only)
The total length of each liquid line is as follows:
ø12.7 mm: A = 40 m = 40 m
ø9.52 mm: B + C + D + a + b + e
= 10 m + 15 m + 10 m + 10 m + 5 m + 10 m = 60 m
ø6.35 mm: c + d = 10 m + 10 m = 20 m
Therefore,
<Calculation example>
Additional refrigerant charge
= 40 m × 0.12 kg/m + 60 m × 0.06 kg/m + 20 m × 0.024 kg/m + 3.5 kg
= 12.4 kg
*When connecting one or more PEFY-P20VMA3-E units, add 0.54 kg of
refrigerant for each of these units.
Value of α
Total capacity of connecting indoor units
Models ~ 80
Models 81 ~ 160
Models 161 ~ 330
Models 331 ~ 390
Models 391 ~ 480
Models 481 ~ 630
Models 631 ~ 710
Models 711 ~ 800
Models 801 ~ 890
Models 891 ~ 1070
Models 1071 ~ 1250
Models 1251 ~
<Amount of factory charged refrigerant>
Outdoor unit model Charged amount
P200 5.5 kg
P250 6.5 kg
P300 6.5 kg
P350 11.5 kg
P400 11.5 kg
P450 11.5 kg
P500 11.8 kg
E Within 2 m
H Pipes on site
α
2.0 kg
2.5 kg
3.0 kg
3.5 kg
4.5 kg
5.0 kg
6.0 kg
8.0 kg
9.0 kg
10.0 kg
12.0 kg
14.0 kg