MXZ-SM42NAMHZ Installation Manual

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4. Installing the refrigerant piping
4.3. Connecting pipes (Fig. 4-5) (Fig. 4-6)
• Conductsufcientanti-condensationandinsulationworktopreventwaterdrip-
ping from the refrigerant piping. (liquid pipe/gas pipe)
• Increase insulation depending on the environment where the refrigerant piping is
installed, or condensation may occur on the surface of the insulation material.
(Insulation material Heat-resistant temperature: 120 °C, 248 °F, Thickness:
15 mm, 5/8 inch or more)
* When the refrigerant piping is used in locations subject to high tempera-
ture and humidity such as in the attic, further addition of insulation may be
required.
• To insulate the refrigerant piping, apply heat-resistant polyethylene foam between
the indoor unit and insulation material as well as to the net between the insulation
materialllingallgaps.
(Condensation forming on the piping may result in condensation in the room or
burns when contacting the piping.)
• The indoor parts of the drain pipe should be wrapped with polyethylene foam insu-
lationmaterials(specicgravityof0.03,thicknessof9mm(3/8inch)ormore).
[Fig. 4-6]
• Apply thin layer of refrigerant oil to pipe and joint seating surface before tightening
arenut. A
• Applyrefrigeratingmachineoilovertheentireareseatsurface.B
• Usethearenutsasfollows.C
• Forconnection,rstalignthecenter,thentightentherst3to4turnsofarenut
by hand.
• Use 2 wrenches to tighten piping connections. D
• Use leak detector or soapy water to check for gas leaks after connections are
completed.
• When bending the pipes, be careful not to break them. Bend radius of 100 mm
(4inch)to150mm(6inch)aresufcient.
• Make sure the pipes do not contact the compressor. Abnormal noise or vibration
may result.
1 Pipes must be connected starting from the indoor unit.
Flare nuts must be tightened with a torque wrench.
2 Flare the liquid pipes and gas pipes and apply a thin layer of refrigeration oil (Ap-
plied on site).
• Whenusualpipesealingisused,refertoTable2foraringofR410Arefrigerant
pipes.
ThesizeadjustmentgaugecanbeusedtoconrmAmeasurements.
Warning:
When installing the unit, securely connect the refrigerant pipes before starting
the compressor.
Caution:
• Be sure to wrap insulation around the piping. Direct contact with the bare
piping may result in burns or frostbite.
Table 2 (Fig. 4-7) mm (inch)
Copper pipe O.D.
A
Flare tool for R410A Flare tool for R22·R407C
Clutch type
ø6.35 (1/4) 0 - 0.5 (0 - 1/64) 1.0 - 1.5 (3/64 - 1/16)
ø9.52 (3/8) 0 - 0.5 (0 - 1/64) 1.0 - 1.5 (3/64 - 1/16)
ø12.7 (1/2) 0 - 0.5 (0 - 1/64) 1.0 - 1.5 (3/64 - 1/16)
ø15.88 (5/8) 0 - 0.5 (0 - 1/64) 1.0 - 1.5 (3/64 - 1/16)
ø19.05 (3/4) 0 - 0.5 (0 - 1/64) 1.0 - 1.5 (3/64 - 1/16)
A (Fig. 4-6)
Copper pipe O.D.
(mm) (inch)
Flare dimensions
øA dimensions (mm) (inch)
ø6.35 (1/4) 8.7 - 9.1 (5/16 - 3/8)
ø9.52 (3/8) 12.8 - 13.2 (1/2 - 33/64)
ø12.7 (1/2) 16.2 - 16.6 (41/64 - 21/32)
ø15.88 (5/8) 19.3 - 19.7 (49/64 - 25/32)
ø19.05 (3/4) 23.6 - 24.0 (15/16 - 61/64)
Copper pipe O.D.
(mm) (inch)
Flare nut O.D.
(mm) (inch)
Tightening torque
(N·m)* (ft·lbs)
ø6.35 (1/4) 17 (43/64) 14 - 18 (10 - 13)
ø6.35 (1/4) 22 (7/8) 34 - 42 (25 - 30)
ø9.52 (3/8) 22 (7/8) 34 - 42 (25 - 30)
ø9.52 (3/8) 26 (1-3/64) 49 - 61 (35 - 44)
ø12.7 (1/2) 26 (1-3/64) 49 - 61 (35 - 44)
ø12.7 (1/2) 29 (1-9/64) 68 - 82 (49 - 59)
ø15.88 (5/8) 29 (1-9/64) 68 - 82 (49 - 59)
ø15.88 (5/8) 36 (1-27/64) 100 - 120 (71 - 87)
ø19.05 (3/4) 36 (1-27/64) 100 - 120 (71 - 87)
* 1 N·m
10 kgf·cm
A
B
C
D
A Liquid pipe
B Gas pipe
C Insulation
D Taping
Fig. 4-5
Fig. 4-6
ø
A
45° ± 2°
(inch)
A Flare cutting dimensions
D Flare nut tightening torque
Union joint Flare nut
Male side Female side
Lock the union joint
with a wrench.
Tightenthearenut
with a torque wrench.
D
90° ± 0.5°
R1/64" to R1/32"
Fig. 4-7
A Die
B Copper pipe
A
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