Mitsubishi Electronics PUHY-YMC installation manual Airtight test and evacuation, Evacuation

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10.7. Airtight test and evacuation

1Airtight test

Airtight test should be made by pressurizing nitrogen gas to 3.0 MPa. For the test method, refer to the following figure. (Make a test with the ball valve closed. Be also sure to pressurize both liquid pipe and gas pipe.)

The test result can be judged good if the pressure has not bee reduced after leaving for about one day after completion of nitrogen gas pressuriza- tion.

A Nitrogen gas

BTo indoor unit

CSystem analyzer

	D Lo knob
	E Hi knob
	F Ball valve	A
	G Liquid pipe	A
	G Liquid pipe	C
	H Gas pipe

IOutdoor unit

JService port

B

C

LO

HI

D E

F

G

H

I

J

2Evacuation

Evacuation should be made from the service port provided on the outdoor unit’s ball valve to the vacuum pump commonly used for both liquid pipe and gas pipe. (Make evacuation from both liquid pipe and gas pipe with the ball valve closed.)

Also evacuate the oil balance pipe that connects the variable capacity and constant capacity units with the oil balance ball valves of both units shut. Evacuate from the service port of the variable capacity unit ball valve with a vacuum pump.

*Never perform air purging using refrigerant.

		D	N	P
		E		D
		F
LO A	HI
B	C	G		G
			I	G
		H	I
		H

J M

O

K

L

ENGLISH

ASystem analyzer

BLo Knob

CHi Knob

DBall valve

ELiquid pipe

FGas pipe

GService port

HThree-way joint

IValve

JValve

KFreon 22 cylinder

LScale

Use a graviometer. (One that can measure down to 0.1 kg.) If you are unable to prepare such a high-precision gravimeter, you may use a charge cylinder.

MVacuum pump

NConstant capacity unit side

OOil balance pipe

PVariable capacity unit side

Note:

Always add an appropriate amount of refrigerant. (For the refrigerant additional charge, see pages 13 to 14.) Too much or too little refrigerant will cause trouble.

Note that it is not possible to determine if a correct amount is being used with the accumulator level (AL).

Warning:

When installing and moving the air conditioner to another site, do not charge the it with a refrigerant different from the refrigerant (R22) specified on the unit.

- If a different refrigerant or air is mixed with the original refrigerant, the refrigerant cycle may malfunction and the unit may be damaged.

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Contents PUHY-YMC Contents Safety precautions Before installation and electric workBefore getting installed Before starting the test run Before getting installed moved electrical workConfirmation of parts attached Combination with indoor unitsSelection of installation site Outdoor unit configurationModel Name Connecting pipe Elbow Shape Variable capacity unit Constant capacity unitWhen inlet air enters from right and left sides of unit Individual installationWhen there is an obstruction above the unit Space required around unitLifting method and weight of product Collective installation and continu- ous installationBe very careful to carry product Installation Installation of unitExample of collective installation Location of anchor boltDown piping and down wiring precautions Connecting direction for refrigerant piping60/61 dB A-weighted Noise levelCountermeasure to seasonal wind Snow and seasonal windPUHY-400/500YMC PUHN-200/250YMCRefrigerant piping installation Areas of cautionNever perform a pump down. This will damage the compressor + α Refrigerant piping systemMultiple line/header For variable capacity unit Precautions concerning piping connection and valve operationFigure shows valve fully open Gas side Liquid side Oil balance side75 to 750 to 50 to 57.5 / 500 to100 to 1000 to Tightening angle standard Pipe diameter mm 60 toOil balance pipe connection method Part could be damaged if not cooled sufficiently Distributor gas connection methodJoint How to install branch pipeRestrictions on the posture for attaching joints Gram belowAirtight test and evacuation Airtight testEvacuation Thermal insulation of refrigerant piping No heat insulation must be provided for electric wiresInner wall concealed Floor fireproofing PenetrationsElectrical work Control box and connecting posi- tion of wiring Variable capacity unitConstant capacity unit Plate For details, see item 11.3. Wiring transmission cablesHole Transmission booster optionalConnecting a transmission booster Wiring transmission cablesWiring examples Name, code and possible unit connectionsRemote control RC terminal block TB6 Wiring method, address settingOne remote control unit for each indoor unit Within Address Unit Remote control operation Same as aboveFor details, see wire connection example C Same group to the remote control RC terminal block TB6 Wiring LineUnit Range Setting method Main remote controllerExtended length and the length to the most remote unit Wiring Booster RPCapability Number of connected indoor units that can be Wiring of main power supply and equipment capacity Test run Operation procedureChecking before getting test run Test run methodAbnormality How to cope with test run abnormalityPower on 6603 Transmission error Transmission route Busy ErrorDisplay at LED lighting blinking Remarks Flag Relay output Flag 8 always lightsCoping with remote controller abnormality Following phenomena do not represent abnormality emergency NMK Nkok NknkNkqk NKPK#$%&*+#$%&*+#,%&- ./0123145&6789#$%&=?@. !# Sknk #$% +,-.Ü SkokUknk TK=Ukok Ukpk Ukqk Vkok Nmknk = NMK=$%&*+,-./01 NMKOK=#$%&*+QMã NMKPK=L Ãã ! k·ãLâÖJÅã NMKQK=#$%&#*#%+, -. !*# NMKRK= NMKSK= #$%& *+& 012345678 .#$%&*+,-./0 1$%#234 NNKNK= NNK=NNKOK= Rsrv NNKPK=#$% +,-./012 NRO #$% +,-./0/12`kQN =EqRF= !# $%&*+ Vwt NNKQK=NOKOK= NOKNK=NOKPK= EptNF EibaF NOKQK= `ççäáåÖ EÉ~íáåÖ NokrkNMK Nknk Nkqk #$%&!*+ Sknk Skok TK= Ukok Ukpk Ukqk Vkok NMK= NMKOK= #$%&*+QMã NMKPK=L NMKQK= #$%&#*#%+, -. !*# NMKRK= NMKSK= #$%& *+& 012345678 .#$%&*+,-./0 1$%#234 NNK= NNKOK= NNKPK= #$% +,-./012 NRO #$#%&* +,-./0123456 =EqRF= !# $%&*+ NNKQK= NOK= NOKPK= EptNF EibaF NOKQK= Nokrk WT02922X02