Installation manual

10
7. Testrun
6. Electricalwork
7.1. Beforetestrun
► Aftercompletinginstallationandthewiringandpipingoftheindoorand
outdoorunits,checkforrefrigerantleakage,loosenessinthepowersup
-
plyorcontrolwiring,wrongpolarity,andnodisconnectionofonephase
inthesupply.
► Use a 500-volt megohmmeterto check that the resistancebetween the
powersupplyterminalsandgroundisatleast1.0MΩ.
► Donotcarryoutthistestonthecontrolwiring(lowvoltagecircuit)termi
-
nals.
Warning:
Donotusetheairconditioneriftheinsulationresistanceislessthan1.0MΩ.
Insulationresistance
After installation or after the power source to the unit has been cut for an extended
period, the insulation resistance will drop below 1 MΩ due to refrigerant accumulat-
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. If the insulation resistance is below 1 MΩ, the compressor is faulty or the resist
-
ance 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.
• The insulation resistance drops due to accumulation of refrigerant in the com
-
pressor. The resistance will rise above 1 M
Ω
after the compressor is warmed
up for four hours.
(The time necessary to warm up the compressor varies according to atmos
-
pheric conditions and refrigerant accumulation.)
• To operate the compressor with refrigerant accumulated in the compressor,
the compressor must be warmed up at least 12 hours to prevent breakdown.
4. If the insulation resistance rises above 1 M
Ω
, the compressor is not faulty.
Caution:
• Thecompressor willnotoperateunless the powersupplyphaseconnec-
tion is correct.
• Turnonthepoweratleast12hoursbeforestartingoperation.
- 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.
► Thefollowingmustbecheckedaswell.
• The outdoor unit is not faulty. LED1 and LED2 on the control board of the out
-
door unit ash when the outdoor unit is faulty.
• Both the gas and liquid stop valves are completely open.
• A protective sheet covers the surface of the DIP switch panel on the control board
of the outdoor unit. Remove the protective sheet to operate the DIP switches easily.
Warning:
IncaseofA-controlwiring,thereishighvoltagepotentialontheS3terminalcausedbyelectricalcircuitdesignthathasnoelectricalinsulationbetweenpow
-
erlineandcommunicationsignalline.Therefore,pleaseturnoffthemainpowersupplywhenservicing.AnddonottouchtheS1,S2,S3terminalswhenthe
powerisenergized.Ifisolatorshouldbeusedbetweenindoorunitandoutdoorunit,pleaseuse3-polestype.
WIRINGSPECIFICATIONSFOR220-240V50Hz
(INDOOR-OUTDOORCONNECTINGCABLE)
Cross section of cable Wire size (mm
2
) Number of wires Polarity L (m)*6
Round
2.5 3
Clockwise : S1-S2-S3
* Pay attention to stripe of yellow and green
(30)
*2
Flat
2.5 3
Not applicable
(Because center wire has no cover nish)
Not applicable
*5
Flat
1.5 4
From left to right : S1-Open-S2-S3
(18)
*3
Round
2.5 4
Clockwise : S1-S2-S3-Open
*Connect S1 and S3 to the opposite angle
(30)
*4
*1 : Power supply cords of appliances shall not be lighter than design 60245 IEC or
227 IEC.
*2 : In case that cable with stripe of yellow and green is available.
*3 : In case of regular polarity connection (S1-S2-S3), wire size is 1.5 mm
2
.
*4 : In case of regular polarity connection (S1-S2-S3).
*5 : In the at cables are connected as this picture, they can be used up to 30 m.
*6 : Mentioned cable length is just a reference value.
It may be different depending on the condition of installation, Humidity or mate
-
rials, etc.
(3C Flat cable
×
2)
Be sure to connect the indoor-outdoor connecting cables directly to the units (no intermediate connections).
Intermediate connections can lead to communication errors if water enters the cables and causes insufcient insulation to ground or a poor electrical contact at the inter-
mediate connection point.
(If an intermediate connection is necessary, be sure to take measures to prevent water from entering the cables.)
BG79U791K01_en.indd 10 9/18/2007 3:43:23 PM