Mitsubishi Electric Mr.SLIM PSA-MKA Serie Manual De Instalación página 8

4. Installing the refrigerant piping
45° ±2°
Apply refrigerating machine oil over the entire flare seat surface.
A Flare cutting dimensions
Copper pipe O.D.
(mm)
ø9.52
ø15.88
en
B Flare nut tightening torque
Copper pipe O.D.
(mm)
ø9.52
ø15.88
Copper pipe O.D.
(mm)
ø9.52 (3/8")
ø15.88 (5/8")
277
120
a
20
d
b
218 99
h
f
95
22 461
g
47
20 105
600
l
6
Be sure to only use the flare nuts that
came with the unit.
Fig. 4-1
Flare dimensions
øA dimensions (mm)
12.8 - 13.2
19.3 - 19.7
Flare nut O.D. Tightening torque
(mm)
22
29
A
A Die
B Copper pipe
Fig. 4-2
A (mm)
Flare tool for R32/R410A
Clutch type
0 - 0.5
0 - 0.5
(mm)
c
e
i
j
k
Fig. 4-3
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.
• After connecting the refrigerant piping to the indoor unit, be sure to test the pipe
connections for gas leakage with nitrogen gas. (Check that there is no refrigerant
leakage from the refrigerant piping to the indoor unit.)
• Use flared nut installed to this indoor unit.
• In case of reconnecting the refrigerant pipes after detaching, make the flared part
of pipe re-fabricated.
• Apply refrigerating machine oil over the entire flare seat surface.
Do not apply refrigerating machine oil to the screw portions.
(This will make the flare nuts more apt to loosen.)
Available pipe size
Liquid side
Gas side
(N·m)
Warning:
34 - 42
When installing the unit, securely connect the refrigerant pipes before starting
68 - 82
the compressor.
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
66
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)
261
70
260
ø9.52
ø15.88