Flaring Work And Pipe Connection; Purging Procedures, Leak Test, And Test Run - Mitsubishi Electric MXZ-4B80VA Installation Manual

3. FLARING WORK AND PIPE CONNECTION

3-1. FLARING WORK
remove burrs in order to avoid to let burrs drop in the piping.
on pipe having completed burr removal. (Not possible to put them on
shown in the table. Select A mm from the table according to the tool
Pipe diameter Nut
Clutch
22
26
3-2. PIPE CONNECTION
cause refrigerant leakage.
Outdoor unit connection
Connect pipes to stop valve pipe joint of the outdoor unit in the same
manner applied for indoor unit.
• For tightening, use a torque wrench or spanner and use the same
tightening torque applied for indoor unit.
3-3. INSULATION AND TAPING
unit.
• When piping have to be arranged through above ceiling, closet or

4. PURGING PROCEDURES, LEAK TEST, AND TEST RUN

4-1. PURGING PROCEDURES AND LEAK TEST
gas pipe. (The stop valve will not work in its initial state fresh out of the
stop valve on the gas pipe side of the outdoor unit.
fold valve, and stop the vacuum pump.
stop valves on both sides of gas pipe and liquid pipe. Operating with-
fect performance of the air conditioner.
6
Tightening torque
Clutch Wing nut
N•m kgf•cm
for R22 for R22
34.3 to 41.2
-
-
-
Copper
pipe
Copper pipe
Burr
Spare reamer
Pipe cutter
Copper pipe
Die
Flare nut
WARNING
When installing the unit, securely
connect the refrigerant pipes before
starting the compressor.
Stop valve cap
- Hexagonal wrench
-
Service port cap
•cm
Precautions when using
the control valve
-
A
Control
valve
Open
Service port
Close
Charge hose
No good
Good
Tilted Uneven Burred
Fig. 1 Fig. 2
Flaring tool
Fig. 3 Fig. 4
Inside is shin-
Smooth all
scratches.
around
Even length
all around
Fig. 5 Fig. 6
Compound pressure
Pressure gauge
Gauge manifold
Stop valve
for GAS Handle High
Handle
Low
Charge hose
Vacuum pump
Stop valve
for LIQUID
When attaching the control valve to
-
form or loosen if excess pressure is
When attaching the control valve to
the service port, make sure that the
valve core is in closed position, and
then tighten part A. Do not tighten
core is in open position.