Mitsubishi Electric PXZ-4F75VG Manual De Instalación página 12

3-3. PIPE CONNECTION
• The connected pipe size differs depending the models and the capacities of indoor units.
Indoor unit capacity
Indoor unit: M series
Indoor unit: S series
Indoor unit: P series
*1 Use a joint pipe if the connection of the indoor unit differs.
• Use tightening torque table above as a guideline for indoor unit side union
joint section, and tighten using two wrenches. Excessive tightening dam-
ages 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 refriger-
en
ant leakage.
• Be sure to wrap insulation around the piping. Direct contact with the bare
piping may result in burns or frostbite.
Indoor unit: ecodan Cylinder unit /
Hydrobox
Indoor unit: DHW tank
4) If the length of the connection pipe is 10 m or less when connecting to a
floor-standing ATA indoor unit, it is recommended to install the optional
muffler (sold separately).
For the installation method, refer to the construction manual for the muffler.
(Optional muffler model name: MAC-001MF-E)
Type
Floor standing
3-4. WATER PIPING WORK
3-4-1. Minimum water quantity
Refer to the indoor unit installation manual.
3-4-2. Available range
(Water flow rate, return water temp.)
Ensure the following water flow rate and return temperature range in the water circuit.
These curves are related to the water quantity.
Note:
Be sure to avoid the unavailable range during defrosting.
Otherwise, the outdoor unit is insufficiently defrosted and/or the heat exchanger of the indoor unit may freeze.
3-5. 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 insula-
tion to prevent condensation.
10
15 ~ 25 35 ~ 42
Liquid pipe size ø6.35 ø6.35
Gas pipe size ø9.52 ø9.52
Liquid pipe size ø6.35 ø6.35
Gas pipe size ø9.52 ø9.52
Liquid pipe size - ø6.35
Gas pipe size - ø12.7
Liquid pipe size
Gas pipe size
Liquid pipe size
Gas pipe size
Model Optional Muffler
MFZ-KT**VG MAC-001MF-E
26.0
24.0
22.0
20.0
18.0
16.0
14.0
12.0
Unavailable range
10.0
5.0 10.0
Water flow rate [L/min]
50 60
ø6.35 ø6.35
ø9.52 *1 ø12.7
ø6.35 ø6.35
ø12.7 ø15.88
ø6.35 ø9.52
ø12.7 ø15.88
Indoor unit connection
Internal thread side
ø6.35
Tighten the flare nut
ø12.7
with a torque wrench.
ø6.35
Outdoor unit connection
ø9.52
When there are the ports which are
not used, make sure their nuts are
tightened securely.
Available range
(10L~15L)
(15L~25L)
(25L~60L)
(over 60L)
15.0 20.0 25.0
WARNING
When installing the unit, securely
connect the refrigerant pipes before
starting the compressor.
Flare nut Union joint
External thread side
Grip the nut on the
union joint with a spanner.
Tighten the flare nut
with a torque wrench.
CAUTION