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Step 4: Test drainage system
• Remove the air filters and pour some water into the drain pan to check if water flow goes through
the pipe correctly and observe carefully the joint to see if it leaks or not.
Step 5: Connect the pipe of indoor unit
• To prevent leakage, apply refrigeration oil on both inner and outer
surfaces of the nut. Use refrigeration oil for R410A.
• Aim the pipe joint at the corresponding bell mouth.
• Pre-tighten the union nut with hand.
• Place the open-end wrench on the pipe joint and place the torque wrench on the union nut. Tighten
the union nut with torque wrench. Adjust the torque force by referring to the following table.
• Wrap the indoor pipe and joint of connection pipe
with insulating pipe, and then wrap it with tape.
CAUTION
• Protect the open end of the pipe against dust and
moisture.
• All pipe bends should be as gentle as possible.
Use a pipe tube bender to bend the pipe.
Bending radius should be 1 3/16” (30 mm)
or larger.
Coat here with refrigeration oil
Pipe joint
Union nut
Pipe
Open-end wrench
Union nut
Pipe
Torque wrench
indoor pipe
Hex nut diameter
Tightening torque
(N-m)
Φ 6
15~20
Φ 9.52
30~40
Φ 12
45~55
Φ 16
60~65
Φ 19
70~75
Insulating pipe
Be sure to
place a cap.
If no flare cap is
available,cover
the flare mouth
with tape to keep
dirt or water out.
