-10-
When Using the Vacuum Pump
• Completely tighten the flare nuts (A, B, C, D). Connect the manifold valve charge hose to a charge port of the packed
valve on the gas pipe side.
• Connect the charge hose connection to the vacuum pump.
• Fully open the handle Lo of the manifold valve.
• Operate the vacuum pump to evacuate. After starting evacuation, slightly loosen the flare nut of the packed valve on
the gas pipe side and check that the air is entering. (Operation noise of the vacuum pump changes and a compound
meter indicates 0 instead of minus.)
• After the evacuation is complete, fully close the handle Lo of the manifold valve and stop the operation of the vacuum
pump. Make evacuation for 15 minutes and more and check that the compound meter indicates -76cmHg(-1.0x10
5
Pa).
• Turn the stem of the packed valve B about 45º counter-clockwise for 6~7 seconds after the gas comes out, then tighten
the flare nut again. Make sure the pressure display in the pressure indicator is a little higher than the atmosphere
pressure.
• Remove the charge hose from the Low pressure charge hose.
• Fully open the packed valve stems B and A.
• Securely tighten the cap of the packed valve.
Safety and Leakage Check
• Soapy water method:
Apply a soapy water or neutral liquid detergent on the indoor unit connections and
outdoor unit connections using a soft brush to check for leakage of the connecting
points of the piping. If bubbles come out, this indicates that the pipes have leakage.
• Leak detector:
Use the leak detector to check for leakage.
CAUTION - See Figure 20:
A:
Lo packed valve
B:
Hi packed valve
C
and
D
are ends of indoor unit connection
Test Running
Perform test operation after completing gas leak check at the flare nut connections and electrical safety check:
• Check that all tubing and wiring have been properly connected.
• Check that the gas and liquid side of service valves are open.
• Connect the power; press the ON/OFF button the remote control to turn the unit on.
• Use the MODE button to select COOL, HEAT, AUTO and FAN, making sure all of the functions work well.
• When the ambient temperature is too low (lower than 62.6º F), the unit cannot
be controlled by the remote control to run at cooling mode; manual operation
can be taken. Manual operation is used only when the remote control is
disabled or maintenance is necessary:
• Hold the panel sides and lift the panel up to an angle until it remains fixed
with a clicking sound.
• Press the Manual control button to select the AUTO or COOL; the unit
will operate under forced AUTO or COOL mode. (See user manual for
details.)
• The test operation should last about 30 minutes.
Air Purging and Test Operation
(cont.)
Fig. 20
Indoor unit
check point
D
B
C
A
Outdoor unit
check point
Cover
Fig. 21
Manual control
button
AUTO/COOL
