Flaring Work And Pipe Connection; Purging Procedures, Leak Test, And Test Run - Mitsubishi Electric MXZ-2B30VA 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 Clutch
for R410A for R22
17
22
0 to 0.5 1.0 to 1.5
26
3-2. PIPE CONNECTION
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.
WARNING
When installing the unit, securely connect the refrigerant
pipes before starting the compressor.
3-3. INSULATION AND TAPING
insulation to prevent condensation.

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
stop valve on the gas pipe side of the outdoor unit.
manifold valve, and stop the vacuum pump.
valve.
stop valves on both sides of gas pipe and liquid pipe. Operating with-
fect performance of the air conditioner.
Tightening torque
Wing nut
N•m kgf•cm
for R22
13.7 to 17.7
1.5 to 2.0
34.3 to 41.2 350 to 420
2.0 to 2.5 500 to 575
-
Hexagonal wrench
-
Precautions when using
the control valve
-
Service
port
Control
valve
Open
Close
A
Good
Copper
pipe
Fig. 1
Copper pipe
Burr
Spare reamer
Pipe cutter
Fig. 3
Smooth all
around
Copper pipe
Die
Flare nut
Fig. 5
Stop valve
–0.101 MPa
for GAS
Stop valve
cap (Torque
N•m, 200 to
Stop valve
for LIQUID
Service port cap
(Torque 13.7 to 17.7 N•m,
•cm
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.
Charge hose
No good
Tilted Uneven Burred
Fig. 2
Flaring tool
Fig. 4
Inside is shin-
scratches.
Even length
all around
Fig. 6
Compound pressure
Pressure gauge
Gauge manifold
Handle High
Handle
Low
Charge hose
Vacuum pump
-
5