Mitsubishi Electric CITY MULTI PUHY-YMC Installation Manual page 17

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 Distributer (gas) (option)
Mount packing (accessory) securely to the valve flange so that gas does
not leak. (screw tightening torque is 43 N·m (430 kg·cm). Apply a coat of
refrigerating machine oil to both surfaces of the packing.
D' Connecting pipe (accessory)
[Use packing and securely install this pipe to the valve flange so that gas
leakage will not occur. (tightening torque: 25 N·m (250 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) ··· liquid, 55 N·m (550 kg·cm) ··· oil
blance
Loosen and tighten this nut using a double-ended wrench.
Coat the flare contact surface with refrigerator oil.]
H' Flare nut
Tightening torque is 55 N·m (550 kg·cm). Use a double spanner to open
and close. Apply a coat of refrigerating machine oil to the flare bonding
surface.
I ø38.1 (PUHY-600YSMC)
ø44.5 (PUHY-650/700/750YSMC)
J 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.
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.
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
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