Mitsubishi Electric PSA-RP125KA / PUHZ-ZRP125YKA [5/24] Installing the refrigerant piping
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Mitsubishi Electric PSA-RP125KA / PUHZ-ZRP125YKA [5/24] Installing the refrigerant piping

Mitsubishi Electric PSA-RP100KA / PUHZ-ZRP100YKA [5/24] Installing the refrigerant piping
5
4.2. Indoor unit (Fig. 4-1)
• When commercially available copper pipes are used, wrap liquid and gas pipes
with commercially available insulation materials (heat-resistant to 100 °C or more,
thickness of 12 mm or more).
• The indoor parts of the drain pipe should be wrapped with polyethylene foam insula
-
tion materials (specific gravity of 0.03, thickness of 9 mm or more).
• Apply thin layer of refrigerant oil to pipe and joint seating surface before tightening
flare nut.
• Use two wrenches to tighten piping connections.
• Use leak detector or soapy water to check for gas leaks after connections are
completed.
• Use refrigerant piping insulation provided to insulate indoor unit connections. Insulate
carefully following shown below.
• Use correct flare nuts meeting the pipe size of the outdoor unit.
Available pipe size
Liquid side ø9.52
Gas side ø15.88
50
260
70
261
115
66
a
b
d
20
277
218
254
140
590
480
761
714
123
110
120
201 77
99
600
20
105
47
461
95
22
120
j
i
k
h
f
g
l
c
e
(mm)
Fig. 4-3
Apply refrigerating machine oil over the entire flare seat surface.
Be sure to only use the flare nuts that
came with the unit.
A Flare cutting dimensions
Copper pipe O.D.
(mm)
Flare dimensions
øA dimensions (mm)
ø9.52 12.8 - 13.2
ø15.88 19.3 - 19.7
B Flare nut tightening torque
Copper pipe O.D.
(mm)
Tightening torque
(N·m)
Tightening angle
(Guideline)
ø9.52 34 - 42 60˚ - 90˚
ø15.88 66 - 82 30˚ - 60˚
A Die
B Copper pipe
A
Fig. 4-2
Fig. 4-1
Copper pipe O.D.
(mm)
A (mm)
Flare tool for R410A
Clutch type
ø9.52 (3/8") 0 - 0.5
ø15.88 (5/8") 0 - 0.5
4. Installing the refrigerant piping
R0.4 - R0.8
90° ±0.5°
45° ±2°
4.3. Refrigerant and drainage pipe locations (Fig. 4-3)
Where knockout holes are indicated, use a saw blade to cut along the groove.
Do not cut the hole larger than the indicated groove.
a Rear surface
b Front surface
c Knockout hole for mounting: 4-10 mm diameter hole
d * knockout hole for connections under the unit
e 120 × 120 knockout hole for connections under the unit
f Indoor/outdoor unit connecting terminals
g Power supply terminals
h Electrical equipment box
I Liquid pipe
j Gas pipe
k Drain pipe outlet diameter ø26 <PVC pipe VP20 connection>
l 140 × 80
Knockout hole for refrigerant and drainage piping and electrical wiring
m 90 × 60
Knockout hole for refrigerant and drainage piping
n 27 mm diameter knockout hole for electrical wiring (there is a similar hole on the left side)
Warning:
When installing the unit, securely connect the refrigerant pipes before start-
ing the compressor.

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