Installing The Refrigerant Piping - Mitsubishi Electric PUD-SWM AA Serie Installationshandbuch

4. COMP fixed parts removing work
en
7 NUTS
TIGHTENING
TORQUE
4 ± 0.4 N·m

5. Installing the refrigerant piping

5.1. Precautions for devices that use R32 refrigerant
• Refer to 1.5. for precautions not included below on
using the outdoor unit with R32 refrigerant.
• Use ester oil, ether oil, alkylbenzene oil (small
amount) as the refrigeration oil applied to the flared
sections.
• Use C1220 copper phosphorus, for copper and cop-
per alloy seamless pipes, to connect the refrigerant
pipes. Use refrigerant pipes with the thicknesses
specified in the table to the below. Make sure the in-
sides of the pipes are clean and do not contain any
harmful contaminants such as sulfuric compounds,
oxidants, debris, or dust.
Always apply no-oxidation brazing when brazing
the pipes, otherwise, the compressor will be dam-
aged.
Pipe size (mm)
Thickness (mm)
9
1 COMP CASE TOP
3 COMP CASE FRONT
Fig. 4-2
ø6.35 ø9.52 ø12.7
0.8 0.8 0.8
ø19.05 ø22.2 ø25.4
1.0 1.0 1.0
• After removing the COMP fixed parts, be sure to tighten nuts, and make COMP
CASE TOP and COMP CASE FRONT back to the original state. (Fig. 4-2)
CAUTION:
• If the COMP fixed parts are not removed, the
operation noise may increase.
WARNING:
• Before the COMP fixed parts are removed, be sure
to be breaker off. If not, the COMP case touches
electrical parts and they may break down.
WARNING:
When installing or relocating, or servicing the outdoor
unit, use only the specified refrigerant (R32) to charge
the refrigerant lines. Do not mix it with any other refrig-
erant and do not allow air to remain in the lines.
If air is mixed with the refrigerant, then it can be the
cause of abnormal high pressure in the refrigerant
line, and may result in an explosion and other hazards.
The use of any refrigerant other than that specified
for the system will cause mechanical failure or sys-
tem malfunction or unit breakdown. In the worst case,
this could lead to a serious impediment to securing
product safety.
• Do not use pipes thinner than those specified
above.
ø15.88
• Use 1/2 H or H pipes if the diameter is 19.05 mm or
1.0
larger.
/ Be sure to have appropriate ventilation in order to
ø28.58
prevent ignition. Furthermore, be sure to carry out
1.0
fire prevention measures that there are no danger-
ous or flammable objects in the surrounding area.
REINSTALLING SEQUENCE
7 3 1
( )
SCREWS TIGHTENING
TORQUE
1.5 ± 0.2 N·m