Refrigerant Piping Task - Mitsubishi Electric MXZ-8A140VA1 Technical & Service Manual

13

REFRIGERANT PIPING TASK

13-1. ADDITIONAL REFRIGERANT CHARGE
H
h1
Total piping length
Farthest piping length (L)
Permissible
length
Piping length between outdoor unit and
(one-way)
branch boxes
Farthest piping length after branch box (I)
Total piping length between branch
boxes and indoor units
In indoor / outdoor section (H) 1
Permissible
height difference
In branch box / indoor unit section (h1)
(one-way)
In each branch unit (h2)
In each indoor unit (h3)
Number of bends
1 Branch box should be placed with in the level between the outdoor unit and indoor units.
• 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.
b1
a1
a2 a3 a4
h3
b2
h2
a5 a6 a7 a8
b1 + b2 + a1+ a2 + a3 + a4 + a5 + a6 + a7 + a8
b2 + a8 70m (b2 55m, a8
b1 + b2 55m
a8 15m
a1+ a2 + a3 + a4 + a5 + a6 a7 + a8
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
79
L
I
Outdoor unit
Branch box
Indoor unit
115m
15m)
60m