Mitsubishi Electric PUHZ-ZRP KA Series Installation Manual page 8

4. Installing the refrigerant piping
When length exceeds 70 m
When the total length of the piping exceeds 70 m, calculate the amount of additional charge based on the following requirements.
Note: If the calculation produces a negative number (i.e. a "minus" charge), of if calculation results in an amount that is less than the "Additional charage amount for 70 m",
perform the additional charge using the amount shown in "Additional charge amount for 70 m".
Main piping:
Amount of additional Liquid line size
charge ø12.7 overall length
=
× 0.11
(kg) (m) × 0.11 (kg/m)
Additional charge amount ZRP200 3.6 kg
for 70 meters
ZRP250 4.8 kg
Fig. 4-9
Refilling refrigerant charge (kg) for less than 30 m (Chargeless pipe length)
Outdoor unit 5 m and less
ZRP100-140 4.5
ZRP200 6.4
ZRP250 6.7
P200 5.8
P250 6.7
Maximum pipe length (ZRP200·ZRP250)
Liquid pipe O.D.
(mm)
Thickness
Gas pipe O.D. ø19.05
(mm)
Thickness t1.0
ZRP200
20m
[20m]
ZRP250
20m
[20m]
Note : Be sure to use hard (tempered) one for pipe over ø19.05.
<Marks in the table above>
: It can be used.
: Cooling capacity is lowered.
: Additional refrigerant charge is required when the
pipe length exceeds 20m.
The maximum pipe length
100m
Charge-less pipe length
[30m]
ZRP200, 250
Additional refrigerant amount when the liquid pipe of the larger diameter is used.
1:1 system
Liquid pipe When the pipe length exceeds 20 m
Additional refrigerant amount
[15.88
* w (g) 0 : Additional charge is not necessary.
Simultaneous twin/triple/quadruple system
When the pipe length (main piping and branch piping) exceeds 20 m
Additional refrigerant amount w (g) =(180 × L1)+(120 × L2) +(90 × L3)+(30 × L4) - 3000
L1 : [15.88 liquid pipe length (m)
L3 : [9.52 liquid pipe length (m)
* w (g) 0 : Additional charge is not necessary.
8
Main piping:
Liquid line size
ø9.52 overall length ×
+
0.09 (Gas line: ø25.4)
(m) × 0.09 (kg/m)
1 Indoor unit
2 Outdoor unit
3 Main piping
4 Branch piping
5 Multi distribution pipe (option) Main piping ø12.7 is A = 65 m
6 - 10 m
4.6
6.5
6.9
5.9
6.9
ø9.52
t0.8
ø22.2 ø25.4 ø28.58 ø19.05
t1.0 t1.0 t1.0
Standard size
100m
50m 100m
[30m] [30m] [30m]
50m 100m 100m
[30m] [30m] [30m]
w (g) =180 × Pipe length (m) - 3000
L2 : [12.7 liquid pipe length (m)
L4 : [6.35 liquid pipe length (m)
Branch piping:
Liquid line size
ø9.52 overall length ×
+
0.06 (Gas line: ø15.88)
(m) × 0.06 (kg/m)
Outdoor unit :
Indoor unit 1 :
Indoor unit 2 :
Indoor unit 3 :
Branch piping ø9.52 is B + C + D = 15 m
Therefore, the amount of additional charge is: 65 × 0.12 + 15 × 0.06 - 3.6 = 5.1(kg)
(Fractions are rounded up)
11 - 15 m 16 - 20 m
4.7 4.8
6.7 6.8
7.1 7.3
6.1 6.2
7.1 7.3
ø12.7
t0.8
ø22.2 ø25.4 ø28.58
t1.0 t1.0 t1.0
20m 50m 100m
[20m] [30m] [30m]
Standard size
100m
20m 50m
[20m] [30m] [30m]
Branch piping:
Liquid line size
ø6.35 overall length
+ -
× 0.02
(m) × 0.02 (kg/m)
ZRP250 A: ø12.7 .... 65 m
ZRP71 B: ø9.52 .... 5 m
ZRP71 C: ø9.52 .... 5 m
ZRP71 D: ø9.52 .... 5 m
21 - 25 m 26 - 30 m
4.9
7.0
7.5
6.4
7.5
ø15.88
t1.0
ø22.2 ø25.4 ø28.58
t1.0 t1.0 t1.0
100m 50m 50m
[30m] [20m] [20m] [20m]
100m 50m 50m
[30m] [20m] [20m] [20m]
3.6 (kg)
5.0
7.1
7.7
6.5
7.7
ø31.75
t1.0 t1.1
50m 50m
[20m]
50m 50m
[20m]