Installing Refrigerant Piping (Mm) - Mitsubishi Electric PAC-SF29LB Installationshandbuch

6. Installing Refrigerant Piping (mm)

Connect R-Converter unit to the liquid pipe
• For identification purposes, list the indoor unit model names in the nameplate on the control box of the R-Converter unit.
• To prevent water from dripping from the refrigerant piping, wrap both the liquid and gas piping with commercially available thermal
insulation that is at least 12 mm thick and which is able to withstand temperatures in excess of 100 °C.
• See the indoor and outdoor unit installation manual when creating a vacuum and opening or closing valves.
• Install the piping so that vibrations from the piping do not transmit to the unit.
Installing piping to the unit
(1) Remove the flared nuts and caps from the R-Converter unit.
(2) Flare the ends of the liquid and gas piping, and apply refrigeration oil (procure locally) to the flared seat.
(3) Connect the refrigerant piping immediately. Always tighten the flared nuts to the specified torque using a torque wrench and double spanner.
(4) Press the pipe covers 1 on the liquid piping against the unit and wrap it to hold it in place.
(5) Fasten the supplied bands 2 10–20 mm from each end of the pipe covers 1.
Caution:
• Tighten the flare nut with a torque wrench in the specified method.
• Do not use the existing refrigerant piping, when use R407C refrigerant.
• Take precautions so that the Freon gas is not leaked during a fire.
±
45º 2º
In order to prevent gas leaks, tighten the flared nut to the specified torque
even when not connecting the indoor unit refrigerant piping.
R-Converter unit
In order to prevent gas leaks, tighten the
flared nuts to the specified torque before
fitting the pipe covers.
Refrigerant pipe
Pipe cover
(procure locally)
To outdoor unit
or to indoor unit
Section of connection
Pipe cover 1
Thermal insulation
for refrigerant piping
Refrigerant piping
Copper piping Flare dimensions
OD (mm) øA dimension (mm)
ø6.35 8.6–9.0
ø9.52 12.6–13.0
Always use flared nuts fitted to the body
(commercially available flared nuts may crack).
ø6.35(1/4F)
(Optional parts)
LEV
Band 2
Tighten.
Torque
N·m (kgf·cm)
14–18 (140–180)
34–42 (340–420)
Refrigerant pipe (procure locally)
ø6.35
or
ø9.52
∗ Each joint of R-Converter unit can
be connected to refrigerant piping to
either outdoor unit or indoor unit.
Refrigerant pipe
• Refrigerant charge:
See the outdoor unit installation manual.
Use only R407C or R22 refrigerant.
• Use the following procedures for connecting parts to the indoor
unit.
a) Tighten the flared nuts to prevent refrigerant leaks.
b) Fasten the pipe covers 1 to the pipes with the bands 2 to
prevent condensation.
∗ Match the refrigerant piping size
to the indoor unit. If using a liquid
pipe that is ø9.52 mm, use joint
pipe PAC-493PI or a locally pro-
cured tandem joint.
A Apply refrigeration oil to the entire surface
of the flared seat.
Pipe cover
(procure locally)
To indoor unit or
to outdoor unit
7