Refrigerant Pipe Work - Mitsubishi Electric Fresh Master GUF-50RDH4 Installation Instructions Manual

7. Refrigerant pipe work

Warning:
shall assume no liability for any damage, breakdown, malfunc-
tion, or accident resulting from the charging of a refrigerant not
and drain pipes.
commercially available insulation (with a heat-resisting temperature
gas pipes.
Be also sure to use commercially available insulating material (with
below) onto all pipes which pass through rooms.
1
6.4 mm to 25.4 mm
28.6 mm to 38.1 mm
2 If the unit is used on the highest story of a building and under
those given in the table above.
3
4
Model
Item
Refrigerant pipe
(Flare connection)
Gas pipe
5
Outerdia of copper pipe
ø6.35
ø9.52
ø12.7
ø15.88
6 Refrigerant system diagram
Heat exchanger
Strainer
More than 12 mm
More than 15 mm
GUF-50RDH4 GUF-100RDH4
GUF-50RD4 GUF-100RD4
ø6.35 ø9.52
ø12.7 ø15.88
14 - 18 N . m
34 - 42 N . m
49 - 61 N . m
68 - 82 N . m
Gas pipe thermistor TH3
Strainer
Flare con-
nection
Linear expansion valve
7.2. Refrigerant piping work
-
This piping work must be done in accordance with the installation
manuals for both outdoor unit and BC controller (simultaneous cool-
ing and heating series R2).
-
- With R2 systems connect Fresh Masters to BC controllers.
- For constraints on pipe length and allowable difference of eleva-
Cautions On Refrigerant Piping
that no foreign matter or moisture enter into the pipe.
nection seating surface and tighten the connection using a
double spanner.
no load is imparted to the Fresh Master end pipe. This metal
Warning:
charge it with refrigerant other than the refrigerant
cycle to malfunction and result in severe damage.
Caution:
- Use refrigerant piping made of C1220 (CU-DHP) phosphorus
copper alloy seamless pipes and tubes". In addition, be sure
that the inner and outer surfaces of the pipes are clean and
ticles, oils, moisture, or any other contaminant.
- The large amount of chlorine in conventional refrigerant and
refrigerator oil in the existing piping will cause the new refriger-
ant to deteriorate.
- Store the piping to be used during installation indoors and
deteriorate and the compressor may fail.
ing R407C, R410A)
- The refrigerant used in the unit is highly hygroscopic and mixes
with water and will degrade the refrigerator oil.
-
-
-
-
9