Medium ESP Duct Type
Indoor Unit (AD*MJERA)
311
Tubing Materials & Specications
Refrigerant Filling Amount
Cutting and Enlarging Connecting
Open All Valves
Checkup for Air Leakage
Vacuumizing
Cutting or enlarging pipes should be
proceeded by installation personnel
according to the operating criterion if the
tube is too long or are opening is broken.
1. Connecting circular terminals:
The connecting method of circular terminal is shown
in the Fig. Take off the screw, connect it to the
terminal tier after heading it through the ring at the
end of the lead and then tighten it.
2.Connecting straight terminals:
The connection methods for the circular terminals
are shown as follows: loosen the screw before
putting the line terminal into the terminal tier, tighten
the screw and confirm it has been clamped by
pulling the line gently.
3.Pressing connecting line
After connecting line is completed, press the
connecting line with clips which should press on the
protective sleeve of the connecting line.
Vacuumize from the stop valve of outdoor
units with vacuum pump. Refrigerant sealed
in indoor machine is not allowed to use for
vacuumization.
Open all the valves of outdoor units. [NB:
oil balancing stop valve must be shut up
completely when connected one main unit.]
Check if there is any leakage at the
connecting part and bonnet with hydrophone
or soapsuds.
Connecting Procedures of Refrigerant Tubing
Add the refrigerant according to the installation instruction of outdoor unit. The addition of R410A refrigerant must
be performed with a measure gage to ensure the specied amount or compressor failure can be caused by lling
too much or little refrigerant.
Proceed the are tube connecting operation to connect all the refrigerant tubes.
• Dual wrenches must be used in the connection of indoor unit tubing.
• Mounting torque refers to the right table
Model AD052~182MJERA AD242~282MJERA
Tubing Size (mm)
Gas pipe φ12.7 φ15.88
Liquid pipe φ6.35 φ9.52
Tubing Material Phosphor deoxybronze seamless pipe (TP 2 ) for air conditioner
Outer Diameter of Tubing (mm) Mounting Torque
φ6.35 11.8~13.7N.m
φ9.52 32.7~39.9N.m
φ12.7 49.0~53.9N.m
φ15.88 78.4~98.0N.m
φ19.05 97.2~118.6N.m
Wrench
Connecting
circular terminals:
Correct
pressing
Terminal tier
Pressing clip
Wrong
pressing
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