Distributor (Gas) Connection Method; How To Install Branch Pipe; Airtight Test, Evacuation And Refrigerant Charging - Mitsubishi Electric PUHY-P-YMF-C Manual De Instalación

Warning:
Failure to connect the oil balance pipe will result in the compressor being
damaged.
• Provide 10 mm of clearance between the variable capacity and constant ca-
pacity units. Position the variable capacity unit so that its front is facing on the
right side and the constant capacity unit so that its front is facing on the left.
Connect the oil balance pipe for the optional CMC-30A according to the follow-
ing procedure.
1 Open the knock-out holes of the left side panel for the variable capacity
unit, and the right side panel for the constant capacity unit.
2 After installing the units, flare-connect the piping included with the unit
(ø12.7).
3 Block the clearance between units with the 2 seals included with the con-
stant capacity unit.
[Fig. 9.3.1] (P.5)
<A> (Constant capacity unit)
<C> Compressor
A 10 mm (clearance between units)
C Left side panel
E Oil balance pipe 1 (optional)
G Flare connection
Tightening torque is 55 N·m (550 kg·cm).
Open and close using a double spanner. Apply a coat of refrigerating ma-
chine oil on both sides of the flare contact surface.
H Oil balance pipe 3 (optional)
J Through holes for oil balance pipe and transmission cables
K Brazing
• If the oil balance piping for the constant capacity unit from the front of the unit
is taken out, bend the piping as shown in the Fig. 9.3.2. (When doing so, en-
sure that the piping doesn't touch the compressor or other parts.)
[Fig. 9.3.2] (P.6)
<A> (Constant capacity unit)
<C> Control box
A Front panel
B Knock out holes for taking out oil balance pipe from front surface
C Ball valve (oil balance) ø12.7 (flare)
D Oil balance pipe (Bend piping at the site)

9.4. Distributor (gas) connection method

[Fig. 9.4.1] / [Fig. 9.4.2] / [Fig. 9.4.3] / [Fig. 9.4.4] / [Fig. 9.4.5] (P.6)
A Brazing
C Flange
E Distributor (gas)
G Connecting pipe (OD28.58 - ID28.58)
H Connecting pipe (OD28.58 - ID28.58)
I Connecting pipe (OD44.45 - ID41.28)
J Connecting pipe (OD44.45 - ID38.1)
K Connecting pipe (OD38.1 - ID34.92)
Taking out piping from the front direction.
(1) Remove the copper cap and rubber packing attached to the piping and flange
of the distributor (gas) (optional).
(2) Assemble outside the unit with the elbow (B) in the specified shape and braze.
(Fig. 9.4.1)
According to type (8), braze the connecting pipe (IJK) also.
(3) Braze the connecting pipe (G) and piping assembled in step (2) to the distribu-
tor (gas) so that the connecting pipe is attached as shown in Fig. 9.4.2. For
assembly procedure, see Fig. 9.4.3. When brazing piping, cool the brazed por-
tion of the distributor side piping with a dampened waste cloth to prevent heat-
ing by brazing.
(4) Connect the ø12.7 oil balance pipe to the ball valve of the variable capacity
unit (oil balance) and constant capacity unit.
(5) Connect the ø15.88 piping branched by the distributor (liquid) to the ball valve
of the variable capacity unit (liquid side).
(6) Insert the distributor (gas) into the variable capacity unit and connect to the
flange of the ball valve (gas side). (Use a socket wrench and socket wrench
extension.) When doing so, be sure to mount the included packing between
the ball valve (gas side) and flange of the distributor.
(7) Fasten the plate of the distributor (gas) to the frame of the unit with screws.
(8) Connect and braze the ø38.1 for 600 type, ø34.92 for P600 type, ø41.28 for
(P)650~750 type, gas piping (main pipe) and ø28.58 gas pipe that connects
the constant capacity unit with the distributor (gas).
Taking out piping in the downward direction.
(1) Remove the copper cap and rubber packing attached to the piping and flange
of the distributor (gas) (optional).
16
<B> (Variable capacity unit)
<D> Control box
B Right side panel
D Ball valve (oil balance) ø12.7 (flare)
F Oil balance pipe 2 (optional)
I Seal material (2 pieces, included)
<B> Compressor
B Elbow
D Fastening plate
F Elbow assembly
(2) Assemble outside the unit with the elbow (B), according to type, braze the
connecting pipe (IJK) in the specified shape and braze. (Fig. 9.4.4.)
(3) Braze the connecting pipe (H) and connecting piping assembled in step (2) to
the distributor (gas) outside the unit. For assembly procedure, see Fig. 9.4.5.
When brazing piping, cool the brazed portion of the distributor side piping with
a dampened waste cloth to prevent heating by brazing.
The rest of the procedure is the same as for "Running piping from front direction."
Caution:
When brazing, cool with a waste cloth dampened with water so that the flange
and ends of the distributor side piping don't get heated.
- Parts could be damaged if not cooled sufficiently.

9.5. How to install branch pipe

For detail, please observe the instruction manual attached to the optional refriger-
ant branch kit.
[Fig. 9.5.1] (P.6)
Å Joint
A To outdoor unit
C Horizontal
E Facing upwards (Facing downwards is not possible)
• Apart from the CMY-Y202-F and CMY-Y302-F gas side, there are no restric-
tions on the posture for attaching joints.
• Ensure that the branch pipes for the CMY-Y202-F and CMY-Y302-F gas side
are attached horizontally or facing upwards (see Fig. 9.5.1).
• There is no limitation on the joint mounting configuration.
• If the diameter of the refrigerant piping selected by the procedures described
on pages 3 to 4 is different from the size of the joint, match the sizes using a
deformed joint. The deformed joint is included with the kit.
[Fig. 9.5.2] (P.6)
Å Header
A To outdoor unit
C Pipe cutter
E Deformed joint
• No restriction is applied to the mounting posture of the header.
• If the diameter of the refrigerant piping selected using the procedures described
on pages 3, 4 and the size of the joint is different, match the sizes using a
deformed joint. The deformed joint is included with the kit.
• When the number of pipes to be connected is smaller than the number of
header branches, install a cap to the unconnected branches. The cap is in-
cluded with the kit.
[Fig. 9.5.3] (P.6)
Å Distributor (liquid)
A Field piping
C Constant capacity unit
Mount the distributor (liquid, optional CMC-30A) so that it is within ±15° in
•
relation to the horizontal plane (see Fig. 9.5.3).
9.6 Airtight test, evacuation and refrigerant
charging
1 Airtight test
Perform with the stop valve of the outdoor unit closed, and pressurize the con-
nection piping and the indoor unit from the service port provided on the stop
valve of the outdoor unit. (Always pressurize from both the high press pipe and
the low press pipe service ports.)
[Fig. 9.6.1] (P.6)
A Nitrogen gas B To indoor unit
D Lo knob E Hi knob
G Low press pipe H High press pipe
J Service port
<For R407C models>
The method of conducting the airtight test is basically the same as for R22 models.
However, since the restrictions have a large affect on deterioration of the refriger-
ating machine oil, always observe them. Also, with nonazeotropic refrigerant (R407C,
etc.), gas leakage causes the composition to change and affects performance.
Therefore, perform the airtightness test cautiously.
B To branch piping or indoor unit
D Within ± 15°
B To indoor unit
D or
B Variable capacity unit
C System analyzer
F Stop valve
I Outdoor unit