79
13
REFRIGERANT PIPING TASK
13-1. ADDITIONAL REFRIGERANT CHARGE
L
I
h2
b2
b1
a6
a5
a4
a3
a2
h3
h1
H
a1
a7 a8
Outdoor unit
Branch box
Indoor unit
Permissible
length
(one-way)
+
1 Branch box should be placed with in the level between the outdoor unit and indoor units.
Permissible
height difference
(one-way)
Total piping length
Farthest piping length (L)
Piping length between outdoor unit and
branch boxes
Farthest piping length after branch box (I)
Total piping length between branch
boxes and indoor units
In indoor / outdoor section (H)
+
1
In branch box / indoor unit section (h1)
In each branch unit (h2)
In each indoor unit (h3)
b1 + b2 + a1+ a2 + a3 + a4 + a5 + a6 + a7 + a8
115m
b2 + a8
70m (b2
55m, a8
15m)
b1 + b2
55m
a8
15m
a1+ a2 + a3 + a4 + a5 + a6 a7 + a8
60m
H
30m (In case of that outdoor unit is set higher than indoor unit)
H
20m (In case of that outdoor unit is set lower than indoor unit)
h1 + h2
15m
h2
15m
h3
12m
| b1 + a1 |,| b1 + a2 |,| b1 + a3 |,| b1 + a4 |,| b1 + a5 |,| b2 + a6 |,
| b2 + a7 |,| b2 + a8 |
15
Number of bends
• Additional charging is not necessary for this unit if the total pipe length (b1 + b2 + a1 + a2 + a3 + a4 + a5 + a6 + a7 + a8)
does not exceed 40 m.
• If the total pipe length exceeds 40 m, charge the unit with additional R410A refrigerant according to the permitted pipe
lengths in the chart on the next page.
After charging the unit with refrigerant, note the added refrigerant amount on the service label (attached to the unit).
Refer to the “installation manual” for more information.
