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24
GB
7.2. Testrun
7.2.1. Usingremotecontroller
Refer to the indoor unit installation manual.
• Besuretoperformthetestrunforeachindoorunit.Makesureeachindoor
unit operates properly following the installation manual attached to the unit.
• Ifyouperformthetestrunforallindoorunitsatonce,youcannotdetectany
erroneous connection, if any, of the refrigerant pipes and the connecting wires.
* The compressor operation is not available for 3 minutes at least after the power
is supplied.
• Thecompressorcanemitnoisejustafterturnonthepowersupplyorincase
of low outside air temperature.
Abouttherestartprotectivemechanism
Once the compressor stops, the restart preventive device operates so the compressor
will not operate for 3 minutes to protect the air conditioner.
7.3. Refrigerantcollecting(Pumpdown)
Perform the following procedures to collect the refrigerant when moving the indoor
unit or the outdoor unit.
1 Turn off the circuit breaker.
2 Connect the low pressure side of the gauge manifold to the service port of the
gas side stop valve.
3 Close the liquid stop valve.
4 Supply power (circuit breaker).
* Start-up of the indoor-outdoor communication takes about 3 minutes after the
power (circuit breaker) is turned on. Start the pump-down operation 3 to 4 minutes
afterthepower(circuitbreaker)isturnedON.
5 ConrmthatSW3-2issettoOFF,andthensetSW3-1toONtoperformthetest
run for cooling operation. The compressor (outdoor unit) and ventilators (indoor
and outdoor units) start operating and test run for cooling operation begins.
Immediately after performing the test run for cooling operation, set the outdoor
serviceswitchSW2-4(pumpdownswitch)fromOFFtoON.
* DonotcontinuetooperateforalongtimewiththeswitchSW2-4settoON.Make
sure to switch it to OFF after pump down is completed.
6 Fully close the gas stop valve when the pressure reading on the gauge drops
0.05-0.00MPa(approximately0.5-0.0kgf/cm
2
)
7 Stop the air conditioner operation (SW3-1: OFF). Set the outdoor service switch
SW2-4fromONtoOFF.
8 Turn off the power supply (circuit breaker).
* If too much refrigerant has been added to the air conditioner system, the pres-
suremaynotdropto0.05MPa(0.5kgf/cm
2
). If this occurs, use a refrigerant
collecting device to collect all of the refrigerant in the system, and then recharge
the system with the correct amount of refrigerant after the indoor and outdoor
units have been relocated.
Warning:
Whenpumpingdowntherefrigerant,stopthecompressorbeforedisconnect-
ingtherefrigerantpipes.Thecompressormayburstandcauseinjuryifany
foreignsubstance,suchasair,entersthesystem.
7.1. Beforetestrun
► Aftercompleting installationand thewiringandpipingoftheindoor and
outdoorunits,checkforrefrigerantleakage,loosenessinthepowersupply
orcontrolwiring,wrongpolarity,andnodisconnectionofonephaseinthe
supply.
► Usea500-voltM-ohmtestertocheckthattheresistancebetweenthepower
supplyterminalsandgroundisatleast1MΩ.
► Donotcarryoutthistestonthecontrolwiring(lowvoltagecircuit)terminals.
Warning:
Donotusetheairconditioneriftheinsulationresistanceislessthan1MΩ.
Insulation resistance
After installation or after the power source to the unit has been cut for an extended
period,theinsulationresistancewilldropbelow1MΩduetorefrigerantaccumulat-
ing in the compressor. This is not a malfunction. Perform the following procedures.
1. Remove the wires from the compressor and measure the insulation resistance of
the compressor.
2. Iftheinsulationresistanceisbelow1MΩ,thecompressorisfaultyortheresistance
dropped due the accumulation of refrigerant in the compressor.
3. After connecting the wires to the compressor, the compressor will start to warm
up after power is supplied. After supplying power for the times indicated below,
measure the insulation resistance again.
• Theinsulationresistancedropsduetoaccumulationofrefrigerantinthecom-
pressor.Theresistancewillriseabove1MΩafterthecompressoriswarmed
up for 12 hours.
(The time necessary to warm up the compressor varies according to atmospheric
conditions and refrigerant accumulation.)
• To operatethecompressorwithrefrigerantaccumulatedinthecompressor,the
compressor must be warmed up at least 12 hours to prevent breakdown.
4. Iftheinsulationresistancerisesabove1MΩ,thecompressorisnotfaulty.
Caution:
• Thecompressorwillnotoperateunlessthepowersupplyphaseconnection
iscorrect.
• Turnonthepoweratleast12hoursbeforestartingoperation.
- Starting operation immediately after turning on the main power switch can result
in severe damage to internal parts. Keep the power switch turned on during the
operational season.
► Thefollowingsmustbecheckedaswell.
• Theoutdoorunitisnotfaulty.LEDonthecontrolboardoftheoutdoorunitash
when the outdoor unit is faulty.
• Boththegasandliquidstopvalvesarecompletelyopen.
7. Testrun
7.2.2. UsingSW3inoutdoorunit
Note:
Incaseofthetestrunfromoutdoorunit,allindoorunitsoperate.Therefore,
youcannotdetectanyerroneousconnectionofrefrigerantpipesandthecon-
nectingwires.Ifitaimsatdetectionofanyerroneousconnection,besureto
carryout thetestrun fromremotecontroller withreference to“7.2.1.Using
remotecontroller”.
■Testrun(fromtheoutdoorunit)
1 Set SW3-2 to select the operation mode.
SW3-2
ON Heating operation
OFF Cooling operation
2 AftersettingSW3-2,setSW3-1fromOFFtoON.Thetestrunstarts.
* Before setting SW3-1, make sure that the circuit breaker is turned on.
* If the setting for SW3-2 is changed during the test run, the operation mode will
change.
* SetSW3-1toOFFtonishthetestrun.
• A few seconds after the compressor starts, a clanging noise may be heard from
the inside of the outdoor unit. The noise is coming from the check valve due to the
small difference in pressure in the pipes. The unit is not faulty.
RG79Y960H01.indb 24 2018/02/09 14:31:10
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