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3-3. PIPE CONNECTION
• The connected pipe size differs depending the models and the capacities of indoor units.
Indoor unit capacity
Liquid pipe size
Indoor unit: M series
Gas pipe size
Liquid pipe size
Indoor unit: S series
Gas pipe size
Liquid pipe size
Indoor unit: P series *2
Gas pipe size
*1 When the diameter of connection pipe does not match the port size of the
indoor unit, use an optional different-diameter joint.
*2 Refer to the installation manual of P series for details of MVZ-A and SVZ-KP.
*3 To connect the PAA-A18 unit, change the gas pipe diameter to ø5/8 inch
(15.88 mm).
• Use tightening torque table above as a guideline for indoor unit side union
joint section, and tighten using two wrenches. Excessive tightening damages
the flare section.
1) Do not apply refrigeration oil on screw threads. Excessive tightening torque
will result in damage on the screw.
2) For connection, first align the center, then tighten the first 3 to 4 turns of flare
nut by hand.
3) Tighten the flare nut with a torque wrench as specified in the table.
• Over-tightening may cause damage to the flare nut, resulting in refrigerant
leakage.
• Be sure to wrap insulation around the piping. Direct contact with the bare
piping may result in burns or frostbite.
3-4. INSULATION AND TAPING
1) Cover piping joints with pipe cover.
2) For outdoor unit side, surely insulate every piping including valves.
3) Using piping tape (E), apply taping starting from the entry of outdoor unit.
• Stop the end of piping tape (E) with tape (with adhesive agent attached).
• When piping have to be arranged through above ceiling, closet or where
the temperature and humidity are high, wind additional commercially sold
insulation to prevent condensation.
06 ~ 09
12
15 ~ 18
ø6.35
ø6.35
ø6.35
ø9.52
ø9.52
ø12.7
ø6.35
ø6.35
ø6.35
ø9.52
ø9.52
ø12.7
ø6.35
ø6.35
ø6.35
ø9.52
ø12.7
ø12.7 *3
24
ø9.52 *1
When installing the unit, securely
ø15.88
connect the refrigerant pipes before
starting the compressor.
ø9.52
ø15.88
ø9.52
ø15.88
When there are the ports which are
not used, make sure their nuts are
tightened securely.
Indoor unit connection
Flare nut
Internal thread side
Tighten the flare nut
with a torque wrench.
Outdoor unit connection
Tighten the flare nut
with a torque wrench.
WARNING
CAUTION
Union joint
External thread side
Grip the nut on the
union joint with a spanner.
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