Mitsubishi Electric PLA-RP-AA Technical Data Book page 77

8-2. PUHZ-RP200·250YHA
8-2-1. 1:1 SYSTEM
(1) Pipe length
<Table 1> Maximum pipe length (RP200·RP250)
Liquid OD
Thick-
pipe
ness
(mm)
gas OD
[19.05
pipe Thick-
t1.0
(mm) ness
RP200
20m
[20m]
20m
RP250
[20m]
Note : The maximum pipe length is 80m in case of new piping.
w1 Be sure to use hard (tempered) one for pipe over [22.2.(Do not use soft (annealed) one.)
w2 When using [31.75 pipe, the outdoor temperature range (dry-bulb temperature) for heating operation is -11 to +21:.
<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 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
Normal piping
SW
70mw1 70m
50m
[30m] [30m]
[30m]
70m 70m
50m
[30m] [30m]
[30m]
Refer to <Table6>
Refer to <Table7>
At time of shipping
(kg)
30 m and less
10.5
No additional
charge necessary
10.5
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]
20m 50m 70m
[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]
77
[15.88
t1.0
[28.58 [22.2 [25.4
t1.0 t1.0 t1.0
SW
70m 50m 50m
[30m] [20m] [20m]
Nomal piping
70mw1 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
50m 50m
[20m] [20m]
The additional charge
amount is obtained by
the following formula.
3.6 (kg)