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Mitsubishi Electric PLA-RP-BA Technical Data Manual Page 87

Mitsubishi electric split-type, heat pump air conditioners.
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8-2. PUHZ-RP200·250YHA2
8-2-1. 1:1 SYSTEM
(1) Pipe length
<Table 1> Maximum pipe length (RP200·RP250)
OD
Liquid
pipe
Thick-
(mm)
ness
gas
OD
[19.05
pipe
Thick-
t1.0
(mm)
ness
RP200
20m
[20m]
20m
RP250
[20m]
Note :
w1 The maximum pipe length is 120m in case of new piping.
w2 When using [31.75 pipe, the outdoor temperature range (dry-bulb temperature) for heating operation is -11 to +21:.
• Be sure to use hard (tempered) one for pipe over [22.2(RP200)/ [19.05(RP250).(Do not use soft (annealed) one.)
<Marks in the table above>
SW : When the outdoor unit is located lower than
the indoor unit, set DIP SW8-1 on the outdoor
unit controller board to ON.
: It can be used.
SW
: Cooling capacity is lowered.
: Additional refrigerant charge is required when
the pipe length exceeds 20m.
The maximum pipe length
70m
Charge-less pipe length
[30m]
(2) Adjusting the amount of refrigerant
Check additional refrigerant charging amount referring to table 7 when the liquid pipe diameter is 1 size larger
than the standard size, and table 2 when the pipe of the standard diameter is used.
<Table 2>
permitted
Outdoor unit
pipe length
RP200
120m or less
RP250
Calculate the additional charge amount based on the following procedure.
If the calculation results in an amount that is smaller than the "Additional charge amount for 70m," perform the additional charge using the amount shown
in "Additional charge amount for 70m."
Main piping:
Amount of additional
Liquid line size
=
charge [kg]
[12.7 over all length [m]
o 0.12 [kg/m]
Additional charge amount
RP200 3.6 kg
for 70 m
RP250 4.8 kg
•If the wiring connecting the indoor and outdoor units is longer than 80m, use separate indoor /outdoor unit
power supplies.
[9.52
t0.8
[22.2
[25.4
[28.58
t1.0
t1.0
t1.0
SW
Standard size
70mw1
70m
50m
[30m]
[30m]
[30m]
SW
50m
70m
70m
[30m]
[30m]
[30m]
Refer to <Table6>.
Refer to <Table7>.
Initial charge
(kg)
30 m and less
6.5
No additional
charge necessary
7.1
Main piping:
Liquid line size
+
[9.52 overall length [m]
o 0.09 [kg/m]
[12.7
t0.8
[19.05
[22.2
[25.4
t1.0
t1.0
t1.0
20m
50m
70m
[20m]
[30m]
[30m]
Standard size
20m
50m
70mw1
[20m]
[30m]
[30m]
Amount of additional refrigerant charge (kg)
31-40 m and less 41-50 m and less 51-60 m and less 61-70 m and less 71-120 m and less
0.9 kg
1.8 kg
1.2 kg
2.4 kg
Branch piping: Liquid
line size
+
[9.52 overall length [m]
o 0.06 [kg/m]
87
[15.88
t1.0
[28.58
[22.2
[25.4
t1.0
t1.0
t1.0
SW
70m
50m
50m
[30m]
[20m]
[20m]
SW
70m
50m
50m
[30m]
[20m]
[20m]
2.7 kg
3.6 kg
3.6 kg
4.8 kg
Branch piping: Liquid
line size
+
[6.35 overall length [m]
o 0.02 [kg/m]
[28.58
[31.75
t1.0
t1.0
w2
SW
SW
50m
50m
[20m]
[20m]
w2
SW
SW
50m
50m
[20m]
[20m]
The additional charge
amount is obtained by
the following formula.
3.6 (kg)

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