How To Install Branch Pipe - Mitsubishi Electric PUHY-YMF-B serie Installationshandbuch

A Valve stem
[Fully closed at the factory, when connecting the piping, when evacuating,
and when charging additional refrigerant. Open fully after the operations
above are completed.]
B Stopper pin [Prevents the valve stem from turning 90° or more.]
C Packing (Accessory)
D Connecting pipe (Accessory)
[Use packing and securely install this pipe to the valve flange so that gas
leakage will not occur. (Tightening torque: 43 N·m (430 kg-cm)) Coat both
surfaces of the packing with refrigerator oil.]
E Open (Operate slowly)
F Cap, copper packing
[Remove the cap and operate the valve stem. Always reinstall the cap after
operation is completed. (Valve stem cap tightening torque: 25 N·m (250
kg-cm) or more)]
G Service port
[Use this port to evacuate the refrigerant piping and add an additional charge
at the site.
Open and close the port using a double-ended wrench.
Always reinstall the cap after operation is completed. (Service port cap
tightening torque: 14 N·m (140 kg-cm) or more)]
H Flare nut
[Tightening torque: 80 N·m (800 kg-cm)
Loosen and tighten this nut using a double-ended wrench.
Coat the flare contact surface with refrigerator oil.]
I ø15.88
J ø31.75 (PUHY-400)
ø38.1 (PUHY-500)
K Field piping
[Braze to the connecting pipe. (When brazing, use unoxidized brazing.)]
Appropriate tightening torque by torque wrench
Copper pipe external dia. (mm)
ø6.35
ø9.52
ø12.7
ø15.88
ø19.05
Tightening angle standard
Pipe diameter (mm) Tightening angle (°)
ø6.35, ø9.52 60 to 90
ø12.7, ø15.88 30 to 60
ø19.05 20 to 35
Note:
If a torque wrench is not available, use the following method as a
standard.
When you tighten the flare nut with a wrench, you will reach a point
where the tightening torque will abrupt increase. Turn the flare nut
beyond this point by the angle shown in the table above.
16
Tightening torque (N·m) / (kg-cm)
14 to 18 / 140 to 180
35 to 42 / 350 to 420
50 to 57.5 / 500 to 575
75 to 80 / 750 to 800
100 to 140 / 1000 to 1400
Caution:
Always remove the connecting pipe from the ball valve and braze it
outside the unit.
- Brazing the connecting pipe while it is installed will heat the ball valve
and cause trouble or gas leakage. The piping, etc. inside the unit may
also be burned.

10.4. How to install branch pipe

For detail, please observe the instruction manual attached to the op-
tional refrigerant branch kit.
Joint
A
A To Outdoor Unit
B To Branch Piping or Indoor Unit
• Apart from the CMY-Y202-F gas side, there are no restrictions on the
posture for attaching joints.
• Ensure that the branch pipes for the CMY-Y202-F gas side are at-
tached horizontally or facing upwards. (See the diagram below.)
Horizontal
Within ±15°
• There is no limitation on the joint mounting configuration.
• If the diameter of the refrigerant piping selected by the procedures
described on pages 13 to 14 is different from the size of the joint,
match the sizes using a deformed joint. The deformed joint is in-
cluded with the kit.
B
Facing upwards
(Facing downwards is not possible)
Within ±15°
Within ±15°