Mitsubishi PUZ-A18NHA6 - Refrigerant Piping Work Cautions

4
Gravimeter
Unit
[3] Service tools
Use the below service tools as exclusive tools for R410A refrigerant.
2-3. CAUTIONS FOR REFRIGERANT PIPING WORK
NewrefrigerantR410Aisadoptedforreplacementinverterseries.AlthoughtherefrigerantpipingworkforR410Ais
sameasforR22,exclusivetoolsarenecessarysoasnottomixwithdifferentkindofrefrigerant.Furthermoreasthe
workingpressureofR410Ais1.6timeshigherthanthatofR22,theirsizesofflaredsectionsandflarenutsaredifferent.
1Thicknessofpipes
SincetheworkingpressureofR410AishighercomparedtoR22,besuretouserefrigerantpipingwiththickness
shownbelow.(Neverusepipesof7/256in[0.7mm]orbelow.)
1/4
3/8
1/2
5/8
3/4
6.35
9.52
12.70
15.88
19.05
1/32 [0.8]
1/32 [0.8]
1/32 [0.8]
5/128 [1.0]
—
1/32 [0.8]
1/32 [0.8]
1/32 [0.8]
5/128 [1.0]
5/128 [1.0]
Nominal
dimensions
(in)
Diagram below: Piping diameter and thickness
Outside
diameter
(mm)
Thickness
: in [mm]
R410A R22
[1] Cautions for service
(1) Perform service after recovering the refrigerant left in unit completely.
(2) Do not release refrigerant in the air.
(3) After completing service, charge the cycle with specified amount of refrigerant.
(4) When performing service, install a filter drier simultaneously.
Be sure to use a filter drier for new refrigerant.
[2] Additional refrigerant charge
When charging directly from cylinder
·CheckthatcylinderforR410Aonthemarketisasyphontype.
·Chargingshouldbeperformedwiththecylinderofsyphonstoodvertically.(Refrigerantischargedfromliquidphase.)
No. Toolname Specifications
1
Gaugemanifold ·OnlyforR410A
·Usetheexistingfitting
specifications
.
·Usehigh-tensionsidepressureof5.3MPa·Gorover.
2
Chargehose ·OnlyforR410A
·Usepressureperformanceof5.09MPa·Gorover.
3
Electronicscale
—
4
Gasleakdetector ·UsethedetectorforR134a,R407CorR410A
5
Adaptorforreverseflowcheck ·Attachonvacuumpump.
6
Refrigerantchargebase
—
7
Refrigerantcylinder ·OnlyforR410A·Topofcylinder(Pink)
·Cylinderwithsyphon
8
Refrigerantrecoveryequipment
—
OCH577A