Service manual

5
1-5-2. Installing Refrigerant Piping (mm)
Check the R-Converter unit accessories and parts
1 Pipe cover o 2 2 Band (long) o 4 3 Thermistor holder—[6.35 (liquid) o 1 4 Thermistor holder—[9.52 (liquid or gas) o 1
5 Thermistor holder—[12.7 (gas) o 1 6 Thermistor holder—[15.88 (gas) o 1 7 Thermistor insulation (3o150o60) o 2
8 Band (short) o 2
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.
Match the refrigerant piping size to
the indoor unit. If using a liquid pipe
that is
[[
9.52 mm, use joint pipe PAC-
493PI or a locally procured tandem
joint.
Section of connection
• 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.
Copper piping
O.D. (mm)
{6.35
{9.52
Flare dimensions
{A dimenson (mm)
8.6-9.0
12.6-13.0
Torque
N-m (kgf
•cm)
14-18 (140-180)
34-42 (340-420)
In order to prevent gas leaks, tighten the flared nut to the
specified torque even when not connecting the indoor unit
refrigerant piping.
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