Mitsubishi Electric s-MEXT G00 Manuel D'installation, Utilisation Et Entretien page 22

s-MEXT G00
2.3 COOLING CIRCUIT CONNECTION TO THE CONDENSING
UNIT
The cooling circuit connection must be completed as defined in the design phase.
Connections are normally inside the s-MEXT G00 unit and can be accessed from the front
panel.
OBLIGATION
The cooling circuits must be completed by qualified personnel.
All the works, the choice of the components and the materials used
must comply with the "Good Practices", according to the
regulations in force in the different countries, taking into account
the intended operating conditions and uses of the equipment.
Errors in the design and/or connection of the cooling circuits can
cause irreparable damage to the compressor (installed on the
Mr.Slim condensing unit), or malfunctioning of the machine.
The s-MEXT G00 unit is delivered with nitrogen pressurised cooling
circuit. The refrigerant charge must be carried out on site by the
installer.
Do not open the taps during the completion of the cooling line with
the Mr.Slim condensing unit.
Fill the cooling circuits of the indoor unit, by opening the outdoor
unit's refrigerant valves only at the end of the installation, when the
unit can receive the power supply, in order to guarantee a minimum
air flow circulation.
2.3.1 TYPE OF COPPER TO BE USED FOR THE COOLING LINE
SOFT COPPER: It's soft and malleable, and can be shaped or bent to make bends,
siphons, etc. Use a pipe bending tool for the bending activities. Avoid
repeated bending or shaping, as the material will gradually harden at the
point of the bend and may break.
HARD COPPER: It's rather stiff, and not suitable for being bent. Only to be used for straight
sections. To make bends, siphons, etc. use forged fittings.
2.3.2 GENERAL INFORMATION FOR THE COMPLETION OF THE COOLING LINE
The cooling line must have a rational and practical path, in order to:
•
limit pressure drops
• reduce the refrigerant content
•
facilitate the return of lubricant oil to the compressor (Mr.Slim condensing unit)
•
facilitate the flow of liquid refrigerant to the expansion valve
•
prevent the return of liquid refrigerant with the compressor stopped
•
vertical sections must be reduced to the minimum.
•
always make large bends, with a minimum radius at least equal to the diameter of the
pipe.
•
always use a roller tube cutter to cut the pipes. Do not use a saw, as it causes internal
burrs and shavings.
•
fix the pipes both horizontally and vertically with copper or plastic collars every 2 m.
• do not use galvanized iron collars, since corrosion may occur at the point of contact
with the copper pipe.
• for insulated pipes, it is advisable to use collars with insulating shells.
•
keep a distance of at least 20 mm between piping.
• do not place electric cables nearby, as they may deteriorate.
•
make "expansion joints" on the line, to balance the natural elongation / shrinkage of
the pipes, as shown in the figure:
2.3.3 CONNECTION OF THE COOLING PIPES TO THE MACHINE
On the gas and liquid pipes inside the machine are cooling circuit ball taps with coupling
copper pipe stub.
OBLIGATION
DO NOT OPEN THE MACHINE COOLING CIRCUIT TAPS
Complete the joint as follows:
1. cut the end of the stub pipe using a roller tube cutter
– DO NOT USE A SAW AS IT WILL CAUSE BURRING
AND CHIPS
2. make a cup joint on the cooling piping and braze weld the
stub pipe
3. Open the machine taps and empty using the service ports
(Ø 5/16").
IF POSSIBLE, AVOID BRAZING ACTIVITIES INSIDE
THE MACHINE.
UM_s-MEXT_G00_01_Z_01_20_ML
2.3.4 WASHING OF COOLANT PIPING
OBLIGATION
The oxide that forms inside the pipe during the brazing process is
dissolved by the HFC fluids and causes obstruction of the
refrigerant filter. During the brazing process it is advisable to
introduce nitrogen into the piping. If this is not possible, after
completing the brazing operation wash the piping using solvents.
2.3.5 PIPING LENGTH AND REFRIGERANT CHARGE
MODEL
SIZE
External unit no.
PUHZ-
Model
ZRP
Gas piping
Ø inches
Liquid piping
Model PUZ-ZM
Gas piping
Ø Pollici
Liquid piping
2.3.6 COOLING CAPACITY CORRECTION FACTOR BASED ON THE LENGTH OF
THE REFRIGERANT PIPING
Refrigerant piping equivalent length (one way) %
Indoor and outdoor unit R410
006 F1 + PUHZ-ZRP60 VHA2
009 F1 + PUHZ-ZRP100 VKA3
013 F1 + PUHZ-ZRP125YKA3
022 F2 + PUHZ-ZRP250YKA3
038 F3 + 2xPUHZ-ZRP200YKA3
044 F2 + 2xPUHZ-ZRP250YKA3
Indoor and outdoor unit R32
006 F1 + PUZ-ZM60 VHA
009 F1 + PUZ-ZM100 VKA
013 F1 + PUZ-ZM125YKA
022 F2 + PUZ-ZM250YKA
038 F3 + 2xPUZ-ZM200YKA
044 F2 + 2xPUZ-ZM250YKA
Refrigerant piping equivalent length (one way)
Indoor and outdoor unit R410
006 F1 + PUHZ-ZRP60 VHA2
009 F1 + PUHZ-ZRP100 VKA3
013 F1 + PUHZ-ZRP125YKA3
022 F2 + PUHZ-ZRP250YKA3
038 F3 + 2xPUHZ-ZRP200YKA3
044 F2 + 2xPUHZ-ZRP250YKA3
Indoor and outdoor unit R32
006 F1 + PUZ-ZM60 VHA
009 F1 + PUZ-ZM100 VKA
013 F1 + PUZ-ZM125YKA
022 F2 + PUZ-ZM250YKA
038 F3 + 2xPUZ-ZM200YKA
044 F2 + 2xPUZ-ZM250YKA
X = NOT ALLOWED
2.3.7 ADDITIONAL REFRIGERANT CHARGE FOR STANDARD DIAMETER PIPING
BASED ON EQUIVALENT LENGTH
For the additional refrigerant charges, refer to the relevant Outdoor Unit Mr.Slim.
PIPING SIZE TABLE
Nominal size (inches)
1/4"
3/8"
1/2"
5/8"
3/4"
1"
22
TRANSLATION OF THE ORIGINAL INSTRUCTIONS
English
006 009 013 022 038
F1 F1 F1 F2 F3
1 1 1 1
60
100 125 250 200
VHA
VKA3 YKA3 YKA3 YKA3
2
5/8" 5/8" 5/8" 1" 1"
3/8" 3/8" 3/8" 1/2" 3/8"
60 100 125 250 200
VHA VKA YKA YKA YKA
5/8" 5/8" 5/8" 1" 1"
3/8" 3/8" 3/8" 1/2" 3/8"
5 m 10 m 20 m 30 m 40 m
1.000 0.988 0.965 0.945 0.928
1.000 0.985 0.957 0.931 0.906
1.000 0.981 0.946 0.914 0.884
1.000 0.979 0.945 0.913 0.883
1.000 0.986 0.958 0.932 0.908
1.000 0.979 0.945 0.913 0.883
5 m 10 m 20 m 30 m 40 m
1.000 0.989 0.967 0.948 0.929
1.000 0.985 0.957 0.932 0.909
1.000 0.981 0.948 0.917 0.887
1.000 0.979 0.946 0.915 0.886
1.000 0.986 0.959 0.934 0.911
1.000 0.979 0.946 0.915 0.886
55 m 60 m 70 m 80 m 90 m
X X X X X
0.874 0.864 0.846 X X
0.844 0.832 0.810 X X
0.843 0.831 0.809 0.789 0.772
0.875 0.865 0.847 0.830 0.815
0.843 0.831 0.809 0.789 0.772
55 m 60 m 70 m 80 m 90 m
0.905 X X X X
0.879 0.870 0.854 0.840 0.829
0.848 0.836 0.814 0.794 0.776
0.847 0.836 0.814 0.796 0.779
0.880 0.870 0.852 0.836 0.821
0.847 0.836 0.814 0.796 0.779
External diameter (mm)
6.35
9.52
12.70
15.88
19.05
25.40
044
F3
2 2
250
YKA3
1"
1/2"
250
YKA
1"
1/2"
50 m
0.913
0.884
0.857
0.856
0.886
0.856
50 m
0.913
0.888
0.861
0.858
0.888
0.858
100 m
X
X
X
0.757
0.801
0.757
100 m
X
0.820
0.761
0.764
0.808
0.764