27
3.
Nut fastening
1
Connect the indoor unit first, then connect the outdoor unit.Before tightening the flare nut, apply refrigeration oil
on the inner and outer surface of the pipe flare (must use refrigeration oil compatible with the refrigerant for this
model), and turn it 3 or 4 turns by hand to tighten it.When connecting or removing a pipe, use two wrenches at
the same time.
2
Align the connecting piping, firstly tighten most of the thread of the connecting nut by hand, and then use a torque
wrench to tighten the last 1-2 turns of the thread as shown in the figure.
3
The welding is done on site, and the bell mouth cannot be used indoors.(For IEC/EN 60335-2-40 except IEC
60335-2-40: 2018)
4
The protective nut is a one-time part, it can not be reused. In case it is removed, it should be replaced with a
new one.(For IEC 60335-2-40: 2018 only)
Bar
Connecting pipe
Clamp handle
Red arrow mark
Cone
Yoke
Handle
"A"
Bar
Apply refrigerant oil to the
inner and outer surface of
the pipe socket.
Flare nut
Piping
Flare nut
Indoor unit pipe
Protective nut
Torque wrench
