Connection of pipe
1 Align the ared end of the copper pipe with the center of the thread joint. Manually tighten the
ared end nut.
2 Use torque wrench to tighten the aring nut until the wrench clatters.
Pipe Diameter Pipe thickness Tightening torque
1/4" 0.8mm 16±2 (N·m)
3/8" 0.8mm 38±4 (N·m)
1/2"
0.8mm 55±6 (N·m)
5/8" 1.0mm 75±7 (N·m)
3/4" 1.2mm 110±10 (N·m)
3 The bending angle of the pipe shall not be too large, and otherwise the pipe may break. Use a
pipe bender to bend the pipe.
4 Wrap the refrigerant pipe and joint in sponge, then bind the sponge with plastic tape.
Air removal
1 Remove both valve shaft caps of the stop valves.
2 Remove the service port cap of the stop valve (gas side).
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 valve and operate the vacuum pump for 10-15 minutes.
Make sure the compound gauge reads -76cmHg.
5 Close the gauge manifold valve.
6 Turn off the vacuum pump.
7 Fully open the stop valve (liquid side) with hexagon socket screw key. (diagonally 4 mm)
Turn all the way up to contact.
8 Fully open the stop valve (gas side) with hexagon socket screw key. Turn all the way up to con
-
tact.
9 Disconnect the gauge manifold hose from the service port.
10 Replace the service port cap and both valve shaft caps tightly.
Notes:
• Use a gauge manifold and hoses exclusive for R410A.
• After air removal, check the tube connections for gas leak using a leakage detector or soapy water.
Regarding leakage detector, use high-sensitivity type designed specially for R410A.
Pipe for Indoor
Unit
Flaring Nuts
Pipe
Wrench
Torque Wrench
1 Remove
1 Remove
2 Remove
3 Connect
4 Operate
4 Open
5 Close
6 Turn off
7 Fully open
8 Fully open
9 Disconnect
10
Replace
10
Replace
10
Replace
Gauge manifold
Compound gauge
Vacuum pump
adapter
Vacuum pump
Service port cap
Stop valve (gas side)
Stop valve (liquid side)
Cap
Cap
Hexagon socket
screw key
INDOOR UNIT
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