Mitsubishi Electric CITY MULTI PUHY-P-YSMF-B Manuel D'installation page 18

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: 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-P600YSMF-B)
ø44.5 (PUHY-P650/700/750YSMF-B)
J Field piping
[Braze to the connecting pipe. (when brazing, use unoxidized brazing.)]
18
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.
• Use ester oil, ether oil or alkylbenzene (small amount) as the
refrigerator oil to coat flares and flange connections.
- The refrigerator oil will degrade if it is mixed with a large amount of
mineral oil.
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