Purging Procedures, Leak Test, And Test Run - Mitsubishi Electric MSZ-D36NA Installation Manual

Nut
Pipe diameter
Clutch
inch
inch (mm)
type tool
(mm)
for R410A
1/4
ø 1/4 (6.35)
(17)
3/8
ø 3/8 (9.52)
(22)
0 to 0.02
(0 to 0.5)
1/2
ø 1/2 (12.7)
(26)
5/8
ø 5/8 (15.88)
(29)
3-2. FLARE CONNECTION
1) Cut the copper pipe as straight as possible with a pipe cutter. (Fig. 1, 2)
2) Remove all burrs from the cut section of the pipe, ensuring that precautions are taken to
avoid getting metal shavings into the piping. (Fig. 3)
4) Flaring work (Fig. 4, 5). Firmly hold copper pipe in the dimension shown in the table.
Select A mm from the table according to the tool you use.
5) Check
3-3. PIPE CONNECTION
Indoor unit connection
Connect both liquid and gas piping to indoor unit.
• Apply a thin coat of refrigerant oil (J) on the seat surface of pipe.
• Use tightening torque table above as a guideline for indoor unit side joints, and tighten
Outdoor unit connection
Connect pipes to stop valve pipe joint of the outdoor unit following the same procedure
detailed in Indoor unit connection.
• For tightening, use a torque wrench or spanner.
When installing the unit, securely connect the refrigerant pipes before starting the
compressor.
3-4. INSULATION AND TAPING
1) Cover piping joints with pipe cover.
2) For outdoor unit side, insulate the piping, including valves.
3) Apply piping tape (G) starting from the connection on the outdoor unit.
• When piping has to be installed through a ceiling, closet or where the temperature
tion.

4. PURGING PROCEDURES, LEAK TEST, AND TEST RUN

4-1. PURGING PROCEDURES AND LEAK TEST
1) Remove service port cap of stop valve on the side of the outdoor unit gas pipe.
2) Connect gauge manifold valve and vacuum pump to service port of stop valve on the
gas pipe side of the outdoor unit.
3) Run the vacuum pump 15 minutes or more.
4) Check the vacuum with the gauge manifold valve, then close it and shut off the vacuum
pump.
5) Leave as it is for one or two minutes. Make sure pointer gauge manifold valve remains
6) Quickly remove gauge manifold valve from service port of stop valve.
7) After refrigerant pipes are connected and evacuated, fully open all stop valves on both
sides of gas pipe and liquid pipe. Operating the unit without fully opening the valves
lowers the performance and causes problems.
8) Refer to 1-3. SPECIFICATIONS, and charge the prescribed amount of refrigerant if
needed. Be sure to charge slowly with liquid refrigerant. Otherwise, composition of the
refrigerant in the system may be changed and affect performance of the air conditioner.
9) Tighten cap of service port.
10) Conduct a leak test
A inch (mm) Tightening torque
Clutch Wing nut
type tool type tool N•m
for R22 for R22
13.7 to
0.06 to
17.7
0.08
(1.5 to
34.3 to
2.0)
0.04 to
41.2
0.06
(1.0 to
49.0 to
1.5)
0.08 to
56.4
0.10
(2.0 to
73.5 to
2.5)
78.4
WARNING
ft•lb
(kgf•cm)
10 to 13
(140 to
180)
25 to 30
(350 to
420)
36 to 42
(500 to
575)
54 to 58
(750 to
800)
Flaring tool
Clutch type
Smooth all around
Even length
all around
-
*4 to 5 turns Stop valve cap
(Torque 19.6 to
*Close
29.4 N•m, 200
*Open
Hexagonal wrench
Service port cap
(Torque 13.7 to
17.7 N•m, 140 to
180 kgf•cm)
Precautions when using the control valve When attaching the control valve
A
Control valve
Open
Close
Body
Good
Copper
pipe
Fig. 1
Copper pipe
Burr
Spare reamer
Pipe cutter
Die
Wing nut type
Flare nut
Fig. 4
Inside is shin-
ing without any
scratches.
Fig. 6
Compound pressure gauge
(for R410A)
Stop valve
for LIQUID
Handle
Low
Stop valve for
GAS
Adapter for pre-
venting the back
Vacuum pump (or the vacuum
pump with the function to
to the service port, valve core may
deform or loosen if excess pressure
is applied. This may cause gas leak.
When attaching the control valve to
the service port, make sure that the
Service port
valve core is in closed position, and
then tighten part A. Do not tighten
part A or turn the body when valve
Charge hose
core is in open position.
No good
Tilted Uneven Burred
Fig. 2
Fig. 3
Copper pipe
Fig. 5
Pressure gauge
(for R410A)
Gauge manifold valve
(for R410A)
Handle High
Charge hose
(for R410A)