Mitsubishi Electric CITY MULTI PEFY-P-NMHU-E2 Installation Manual

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6.Refrigerantpipeanddrainpipespecications
Toavoid dew drops, provide sufcient antisweating and insulating work to the
refrigerant and drain pipes.
When using commercially available refrigerant pipes, be sure to wind commer-
cially available insulating material (with a heat-resisting temperature of more
than100°C[212°F]andthicknessgivenbelow)ontobothliquidandgaspipes.
Be also sure to wind commercially available insulating material (with a form
polyethylene’sspecicgravityof0.03andthicknessgivenbelow)ontoallpipes
which pass through rooms.
1
 Selectthethicknessofinsulatingmaterialbypipesize.
Pipesize Insulatingmaterial’sthickness
6.4 mm to 25.4 mm [1/4 in to 1 in] More than 10 mm [7/16 in]
28.6 mm to 38.1 mm [1-1/8 in to 1-1/2 in] More than 15 mm [5/8 in]
2
If the unit is used on the highest story of a building and under conditions of
hightemperatureandhumidity,itisnecessarytousepipesizeandinsulating
material’sthicknessmorethanthosegiveninthetableabove.
3
 Iftherearecustomer’sspecications,simplyfollowthem.
6.1. Refrigerantpipespecications
Refrigerantpipesizes
R410A
Liquid pipe Gas pipe
Pipesize Pipesize
P15·18 O.D. ø6.35 mm (1/4") O.D. ø12.7 mm (1/2")
P24·27·30·36·48·54 O.D. ø9.52 mm (3/8") O.D. ø15.88 mm (5/8")
6.2. Refrigerantpipe,drainpipeandlling
port
[Fig. 6.2.1] (P.2)
A
Air inlet
B
Refrigerant piping (liquid)
C
Refrigerant piping (gas)
D
Control box
E
Drain outlet
F
Air outlet
6.3. Requestforrefrigerantpipingconnec-
tion
Connecting refrigerant piping
• Afterconnectingrefrigerantpiping,insulatethejoints(aredjoints)withther-
mal insulation tubing as shown below.
[Fig.6.3.1](P.3)
A
Thermal insulation tubing
1
B
Caution:
Pulloutthethermalinsulationontherefrigerantpipingatthesite,brazethepiping,
and replace the insulation in its original position.
Takecaretoensurethatcondensationdoesnotformonexposedcopperpiping.
C
Refrigerant piping (liquid)
D
Refrigerant piping (gas)
E
Main body
F
Thermal insulation tubing
2
G
Site refrigerant piping
H
Ensure that there are no gaps between the insulation and the main body.
I
Thermal insulation tubing (small) (accessory)
1
J
Tie band (large) (accessory)
4
K
Ensure that there is no gap here. Place join upwards.
L
Thermal insulation tubing (large) (accessory)
2
M
Cut
N
Releasegasbeforeremovingthebrazing.
O
Thermal insulation
P
Pull
Q
Pipe end
R
Wrap with damp cloth
S
Return to original position
T
Ensure that there is no gap here.
Caution:
Beforeremovingthebrazing,cutofftheendofthepipetoreleaseanygas.
Ifthegasisnotreleased,thepipemayyoff.
1. Pulloutthethermalinsulationonthesiterefrigerantpiping,brazetheunit
piping, and replace the insulation in its original position.
* Beforebrazingtherefrigerantpiping,alwayswrapthepipingonthemain
body,andthethermalinsulationpiping,withdampclothstoprevent
heatshrinkageandburningthethermalinsulationtubing.Takecareto
ensurethattheamedoesnotcomeintocontactwiththemainbodyitself.
Refrigerantamountadjustment
Refer to the installation manual for the outdoor unit for details on adjusting the
amount of refrigerant.
7. Connecting refrigerant pipes and drain pipes
7.1. Refrigerantpipingwork
This piping work must be done in accordance with the installation manuals for
both outdoor unit and BC controller (simultaneous cooling and heating series R2).
• Series R2 is designed to operate in a system that the refrigerant pipe from an
outdoor unit is received by BC controller and branches at the BC controller to
connect between indoor units.
• For constraints on pipe length and allowable difference of elevation, refer to
the outdoor unit manual.
• Themethodofpipeconnectionisbrazingconnection.
Cautions On Refrigerant Piping
u
Besuretousenon-oxidativebrazingforbrazingtoensurethatnofor-
eign matter or moisture enter into the pipe.
u
 Besuretoapplyrefrigerating machine oil over the flare connection
seatingsurfaceandtightentheconnectionusingadoublespanner.
u
 Provideametalbracetosupporttherefrigerantpipesothatnoloadis
impartedtothe indoorunitendpipe.This metalbraceshouldbepro-
vided50cmawayfromtheindoorunit’sareconnection.
Warning:
Wheninstallingandmovingtheunit,donotchargeitwithrefrigerantother
thantherefrigerantspeciedontheunit.
- Mixing of a different refrigerant, air, etc. may cause the refrigerant cycle to
malfunction and result in severe damage.
Caution:
• Use refrigerant piping made of C1220 (Cu-DHP) phosphorus deoxidized
copperasspeciedin theJISH3300“Copperand copper alloyseam-
lesspipesand tubes”.Inaddition,besure that theinnerandouter
surfacesofthepipesarecleanandfreeofhazardoussulphur,oxides,
dust/dirt,shavingparticles,oils,moisture,oranyothercontaminant.
• Never use existing refrigerant piping.
- The large amount of chlorine in conventional refrigerant and refrigerator oil
in the existing piping will cause the new refrigerant to deteriorate.
• Storethepipingtobeusedduringinstallationindoorsandkeepboth
endsofthepipingsealeduntiljustbeforebrazing.
- If dust, dirt, or water gets into the refrigerant cycle, the oil will deteriorate
and the compressor may fail.
• Useesteroil,etheroiloralkylbenzene(smallamount)astherefrigera-
toroiltocoataresandangeconnections.(FormodelsusingR410A
or R407C)
- The refrigerant used in the unit is highly hygroscopic and mixes with water
and will degrade the refrigerator oil.

Mitsubishi Electric CITY MULTI PEFY-P-NMHU-E2 Specifications

General

Brand	Mitsubishi Electric
Model	CITY MULTI PEFY-P-NMHU-E2
Category	Air Conditioner
Language	English