Mitsubishi Electric PKA-RP1.6GAL Service Technical Manual page 22

4-3-2. Synchronized twin and triple
(a) Pipe length
Please note that refrigerant piping length, bend number and height difference of indoor units are specified for each unit
combination.
Note: Be sure to use our Multi-distributor for distributing pipe to use existing piping.
<Table 5>
Synchronized twin
Outdoor PUHZ-RP3VHA
unit
PUHZ-RP3VHA-A
PUHZ-RP4-6VHA
PUHZ-RP4-6VHA-A
<Table 6>
Synchronized twin
Outdoor
PUHZ-RP6VHA
unit
PUHZ-RP6VHA-A
Note 1: If total piping length exceeds charge-less piping length of 30 m, charge additional refrigerant according to the table 7.
<Table 7>
Outdoor unit
PUHZ-RP3VHA
PUHZ-RP3VHA-A
PUHZ-RP4-6VHA
PUHZ-RP4-6VHA-A
Note 2: Bends number (w 2) should be within 8 for each combination, A + B, A +C and A + D, and 15 in all.
Note 3: Height difference between indoor and outdoor unit is referred to no matter which unit is located higher or lower.
<Table 8> Pipe length for twin of RP 3 - 6 (Piping length: A + B + C)
Liquid [6.35
Gas [12.7
Liquid [6.35
Branch pipe
Gas [12.7
diameter
Liquid [9.52
[B and C]
Gas [15.88
Liquid [12.7
Gas [19.05
<Table 9> Pipe length for triple of RP6 (Piping length: A + B + C + D)
Liquid [9.52
Gas [15.88
Liquid [6.35
Branch pipe
Gas [12.7
diameter
Liquid [9.52
[B,C and D]
Gas [15.88
Liquid [12.7
Gas [19.05
Permitted total piping
length A + B + C
50 m or less
75 m or less
Permitted total piping
length A + B + C + D
70 m or less
Additional refrigerant to be charged (kg)
30 m or less 31 - 40 m
Not required
RP3 Twin (RP1.6 2)
Liquid [9.52 Liquid [9.52
Gas [15.88 Gas [15.88
50 m 75 m( 2)
50 m
Main pipe diameter [A]
Liquid [12.7
Gas [19.05
75 m( 2) 50 m( 1)
50 m 50 m( 1)
Chargeless piping
length A + B + C
30 m or less
Charge-less piping
length A + B + C + D
30 m or less
A + B + C (+D)
41 - 50 m 51 - 60 m
0.6 1.2
RP4 Twin (RP2 2) RP5 Twin (RP2.5 2)
Main pipe diameter [A]
Liquid [12.7 Liquid [9.52
Gas [19.05 Gas [15.88
50 m( 1)
50 m 50 m( 1) 75 m( 2)
1 ··· Set DIP SW8-1 on outdoor unit control circuit board to ON.
2 ··· When using existing piping, pipe length should be 50 m at most.
3 ··· Height difference between indoor and outdoor unit should be
kept within 30 m in every case.
[Marks in table]
··· Normal piping
··· It can be used with some changes of piping length and the
amount of refrigerant to be charged.
··· It cannot be used.
22
Indoor unit's height
difference [B and C]
8 m or less
Indoor unit's height difference
[B and C] [C and D] [B and D]
8 m or less
w Charge additional
refrigerant from
the check valve
61 - 75 m
connected to the
pipe of low-pressure
side in indoor unit.
1.8 2.4
RP6 Twin (RP3 2)
Liquid [12.7 Liquid [9.52
Gas [19.05 Gas [15.88
50 m( 1) 75 m( 2)
Bend number
w 2
15 at most
Bend number
w 2
15 at most
Liquid [12.7
Gas [19.05
50 m( 1)