Mitsubishi Electric City Multi PUHN-200YMC, Installation Manual

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17
ENGLISH
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) Tightening torque (N·m) / (kg·cm)
ø6.35 14 to 18 / 140 to 180
ø9.52 35 to 42 / 350 to 420
ø12.7 50 to 57.5 / 500 to 575
ø15.88 75 to 80 / 750 to 800
ø19.05 100 to 140 / 1000 to 1400
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.