Mitsubishi Electric PUHY-RP200, Service Handbook

Page: 57 / 306

[
II
Restrictions ]
- 48 -
HWE10130 GB
RP400, RP450, RP500, RP550 models
1) Maximum allowable piping length depends on the total amount of refrigerant in a given system. Use the formulas below to
calculate the maximum length.
PUHY-RP400 - RP550YSJM: 0.29 × L
1
+ 0.2 × L
2
+ 0.12 × L
3
+ 0.06 × L
4
+ 0.024 × L
5
< 25 (kg)
PUHY-RP400 - RP550YSJM: 3.12× L
1
' + 2.15 × L
2
' + 1.29 × L
3
' + 0.65 × L
4
' + 0.26 × L
5
' < 56 [oz]
2) When merging two refrigerant piping systems into one, make sure the length difference between the two systems is 40 m [131
ft] or less.
L
H2
B
e
h
f
6
1
a
c
b
3
2
5
A
D
C
d
4
F
E
Indoor Indoor Indoor
Indoor Indoor Indoor
Outdoor unit
Outdoor unit
First liquid refrigerant distributor
First gas refrigerant distributor
H1
(Outdoor unit above indoor unit)
H1'
(Outdoor unit below indoor unit)
Branch joint
First branch
(Branch joint)
Branch header
cap
(Note1) Install the pipe that connects the branch pipe and the outdoor units in
the way that it has a downward inclination toward the branch pipe.
Downward inclination
To indoor unit
To indoor unit
Upward inclination
To indoor unit
To indoor unit
2m [6 ft] Max.
Trap
(gas pipe
only)
2m [6 ft]
If the piping length between the branch pipe and the
outdoor unit exceeds 2 m [6 ft] , provide a trap on the
piping (gas piping only) within 2 m [6 ft] of the branch
pipe to prevent the refrigerant oil from accumulating in
the piping and causing compressor damage.
Minimum trap height: 200 mm [7 inches]
Unit: m [ft]
Operation Pipe sections Allowable length of pipes
Piping
length
Indoor
unit side
Total pipe length A+B+C+D+E+F+a+b+c+d+e+f 300 [984] or less (Note 1)
Total pipe length (L) from the
outdoor unit to the farthest indoor
unit
E(F)+A+B+C+c
or E(F)+A+D+f
120 [393] or less
(Equivalent length 150 [492]or
less)
Total pipe length from the first
branch to the farthest indoor unit
( )
B+C+c
or D+f
40 [131] or less (Note 2)
Outdoor
unit side Between outdoor units
E+F
10 [32] or less
(Equivalent length 12 [39] or
less)
Height
difference
Between indoor
and outdoor units
Outdoor unit
above indoor
unit
H1
50 [164] or less
Outdoor unit
below in-
door unit
H1'
40 [131] or less
Between indoor units h 15 [49] or less
Between outdoor units H2 0.1 [0.3] or less
L
1
: Length of ø19.05 liquid pipe (m)
L
2
: Length of ø15.88 liquid pipe (m)
L
3
: Length of ø12.7 liquid pipe (m)
L
4
: Length of ø9.52 liquid pipe (m)
L
5
: Length of ø6.35 liquid pipe (m)
L
1
' : Length of ø19.05 [3/4"] liquid pipe [ft]
L
2
' : Length of ø15.88 [5/8"] liquid pipe [ft]
L
3
' : Length of ø12.7 [1/2"] liquid pipe [ft]
L
4
' : Length of ø9.52 [3/8"] liquid pipe [ft]
L
5
' : Length of ø6.35 [1/4"] liquid pipe[ft]