7-5
12PHR-N
7 AIR REMOVAL
Lo
Hi
Use a vacuum pump, gauge manifold and hoses exclusively for R410A.
(1) Remove both valve shaft caps of the 2 and 3-way valves.
(2) Remove the service port cap of the 3-way valve.
(3) Connect the gauge manifold hose to the service port and the vacuum
pump.
Be sure that the hose end to be connected to the service port has a
valve core pusher.
(4) Open the gauge manifold low-pressure valve(Lo) and operate the vacu-
um pump for 10-15 minutes.
Make sure the compound gauge reads -0.1 MPa(-76 cmHg).
(5) Close the gauge manifold valve.
(6) Turn off the vacuum pump.
Leave as it for 1-2 minutes and make sure the needle of the compound
gauge does not go back.
(7) Open the 2-way valve 90° counterclockwise by turning the hexagon
wrench. Close it after 5 second, and check for gas leakage.*
(8) Disconnect the gauge manifold hose from the service port.
(9) Fully open the 2-way valve with hexagon wrench.
(10) Fully open the 3-way valve with hexagon wrench.
(11) Firmly tighten the service port cap and both valve shaft caps with a
torque wrench at the specified tightening torque.
* Check the pipe connections for gas leak using a leakage detector or
soapy water. Regarding leakage detector, use high-sensitivity type de-
signed specially for R410A.
* If a high pressure test is mandatory in your country, make sure to follow
the local legislation.
Gauge manifold
Compound gauge
Vacuum pump
Service port cap
3-way valve
Valve shaft cap
Valve shaft cap tightening torque
Pipe size
Torque
Liquid side
1/4"
24±3 N · m (2.4±0.3 kgf · m)
Gas side
3/8"
24±3 N · m (2.4±0.3 kgf · m)
Service port cap tightening torque
Torque
11±1 N
·
m (1.1±0.1 kgf
·
m)
2-way valve
Hexagon wrench
(Diagonally 4 mm)
OPEN
Service port
CLOSE
(1) Process the end of the connecting cable and the power supply cable for the outdoor unit.
• Use a copper cable.
Cross-section area
Unit-to-unit cable
1,5 mm
2
Power supply
cable
1,5 mm
2
(2,5 mm
2
in case the cable
length exceeds 20m)
• For power supply cable, securely clamp a round terminal to each end of the stripped cable.
• Use a cable which is not lighter than polychloroprene sheathed flexible cord (code designation 60245 IEC 57).
(2) Remove the control box cover.
(3) Remove the cable holder and connect the cables.
Be sure that the terminal connections are as specified.
(4) Fix the cable sheaths with the cable holder and the screw.
(5) Double-check that the cables are securely in place.
(6) Place the control box cover back in the reverse order.
*If the cable sheaths are not firmly secured with the cable holder, put the SHEET on the cable
holder base.
Caution:
• Be sure to put the cable leads deep into the terminal board and tighten up the screws. Poor contact can cause overheating or fire, or malfunction.
N 1
2
Power supply
cable
Control box cover
Connecting cable
Terminal board
Cable holder
Screw
8
40mm
50mm
8mm
8mm
55mm
65mm
Earth wire
Connecting cable
Power supply cable
Earth wire
Earth wire
Screw
CONNECTING THE CABLE TO THE OUTDOOR UNIT
12
SHEET
Cable holder
Cable holder base
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