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Vacuuming is necessary to eliminate all moisture and air from the system.
Vacuuming The Piping And The Indoor Unit
The indoor unit and the refrigerant connection pipes must
be air-purged because the air containing moisture that
remains in the refrigerant cycle may cause malfunction of
the compressor.
•
Remove the caps from the valve and the service port.
•
Connect the center of the charging gauge to the vacuum
pump.
•
Connect the charging gauge to the service port of the
3-way valve.
Short Duct Specification
•
The indoor unit is provided with air discharge and air intake "knock-out" hole for duct connection. However the
connection of the short duct for air discharge is possible on only one side.
•
The use of short duct for air discharge will improve airflow distribution if there is an obstruction (such as a lighting
fixture) or in a long, narrow room or an L-shaped room. It also use for air conditioning of two rooms simultaneously.
Possible Direction For Air Discharge And Air Intake
Air Discharge
Air Discharge
NOTE
•
Avoid using the short duct on which the air discharge grille can be completely closed, to prevent evaporator
freezing.
•
In order to prevent condensation forming, be sure that there is sufficient thermal insulation and no leakage of cool
air when installing the short duct.
•
Keep the introduction of fresh air intake within 20% of total air flow. Also provide chamber and use booster fan.
Sealing Material
•
It is possible to seal one of the four air discharge outlet. (sealing two or more air discharge outlet could cause a
malfunction)
•
Remove the front panel and insert the sealing material into the air discharge outlet on the indoor unit to seal the air
outlet.
•
The sealing material is the same length as the longer air discharge outlet. If it is desired to seal the shorter air discharge
outlet, cut the sealing material to shorten it.
•
Push the sealing material in about 10 mm beyond the bottom surface of the indoor unit so that it does not touch the air
louver. Be sure not to push the sealing material in any farther than about 10mm.
VACUUMING AND CHARGING
ACCESSORY PARTS
Air Discharge
Air Intake
Air Discharge
•
Start the vacuum pump. Evacuate for approximately 30
minutes. The evacuation time varies with different vacuum
pump capacity. Confirm that the charging gauge needle has
moved towards -760mmHg.
Caution
•
If the gauge needle does not move to -760mmHg, be sure to
check for gas leaks (using the refrigerant detector) at flare
type connection of the indoor and outdoor unit and repair
the leak before proceeding to the next step.
•
Close the valve of the changing gauge and stop the vacuum
pump.
Possible Opening Dimension For Duct Connection
10
50
50
50
115
20
Air Discharge Knock Out Hole
1-10
50
50
10
115
Air Intake Knock
PCD Ø140
Ø100
Out Hole
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