Piping Design - Mitsubishi Electric PFAV-P250VM-E Data Book

2. Piping Design

1-2-1. PUHY-P250 Piping
OU
L1
A
Fig. 1-2-1A Piping scheme
Table1-2-1-1. Piping length
Item
Farthest IU from OU (L1)
Height between OU and IU (OU above IU)
Height between OU and IU (OU under IU)
OU: Outdoor Unit, IU: Indoor Unit
Table1-2-1-2. Bent equivalent length "M"
Outdoor Model M (m/bent [ft./bent])
PUHY-P250 0.42 [1.38]
Table1-2-1-3. Piping "A" size selection rule
Outdoor
PUHY-P250=CMY-Y102L-G2
*1. A>=90m [295ft.], ø12.70mm [1/2in.]
Table1-2-1-4. Indoor unit piping size selection rule
Indoor Unit size
P250, P300-F *2
*2. "-F" indicates Fresh air intake type
Note1. "-"
Note2. If the A/C system is designed to use cooling mode under outdoor temperature 0˚C, H'<=15m.
Note3. As bents cause pressure loss on transportation of refrigerant, fewer bents design is better;
Piping length needs to consider the actual length and equivalent length which bents are counted.
Equivalent piping length (m)=Actual piping length+"M" x Quantity of bent.
IU
IU : Indoor unit , OU : Outdoor unit
Piping in the figure Max. length
A 165 [541']
H 50 [164']
H' 40 [131']
(mm [in.])
Pipe(Liquid) Pipe(Gas)
ø9.52 [3/8"] *1 ø22.20 [7/8"]
(mm [in.])
Pipe(Liquid) Pipe(Gas)
ø9.52 [3/8"] ø22.20 [7/8"]
(m [ft.])
Max. equivalent length
190 [623']
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