Refrigerant Piping - Toshiba RAV-M240A-E Service Manual

5-1. Refrigerant Piping

5-1-1. Permissible Piping Length and Head
The minimum inter-unit refrigerant piping length shall
be 2m.
Limit the number of bends in the refrigerant piping to
10 or less.
Connectable
Model indoor unit
number
RAS-09EK
4
5-1-2. Piping Material and Sizes
Table 5-2
Phosphate deoxidized copper
Piping material
seamless pipes for air conditioners
Model
Piping Larger
size
Smaller
(mm)
5-1-3. Air Purging
• Subject the refrigerant tube of outdoor and in-
door units to air purge with a vacuum pump.
• Do not carry out this air purge by using the refrig-
erant filled in the outdoor unit.
• To handle valves, a 5 mm hexagon wrench is
needed.
Table 5-1
Permissible
Permissible
difference
piping length
pipe lengths
15m ( + ) 8m ( –
1 2 1
15m ( + ) 8m ( –
3 4 3
RAS-09EK
9.5
6.4
– 10 –
Fig. 5-2
Between units A
Permissible
piping head (H)
)
2
5m
)
4
5-1-4. Refrigerant Pipe Connecting Position
Fig. 5-3
5-1-5. Additional Refrigerant Quantities
Table 5-2
Model
Addition per meter
and B piping Remarks
head (∆ ∆ ∆ ∆ ∆ h)
1m Fig. 5-2
φ
φ
φ
φ
φ
RAV-M240A-E
No need