Haier AB072MRERA - Page 237

DC Slim Duct Type
Indoor Unit
229
Pipe Length & Height Difference
Tubing Materials & Specications
Refrigerant Recharge Amount
Connecting Procedures of Refrigerant Tubing
Cutting and Enlarging
Checkup for Air Leakage
Vacuumizing
Connecting
Open All Valves
Please refer to the attached manual
of outdoor units.
Special tools for R410A should be
used for cutting and enlarging pipes.
Model
AD072~092
MSERA(D)
AD122~182
MSERA(D)
AD242
MSERA(D)
Tubing
Size(mm)
Gas pipe Ø9.52 Ø12.7 Ø15.88
Liquid
pipe
Ø6.35 Ø6.35 Ø9.52
Tubing
Material
Phosphor deoxy bronze seamless pipe (TP
2
)
for air conditioner
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 specied amount while
compressor failure can be caused by lling too much or little refrigerant.
With the soft solder, the nitrogen-lling protection should be used.
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.
Vacuumize from the stop valve of outdoor units with vacuum pump. Refrigerant sealed in indoor machine is not
allowed to use for vacuumization.
Vacuum pump with check valve should be used for vacuumizing to prevent pump oil owing into the machine.
Open all the valves of outdoor units. [NB: oil balancing stop valve must be shut up completely when only
connected one main unit.]
Check if there is any leakage at the connecting part and bonnet with hydrophone or soapsuds.
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 conrm 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.
correct
pressing
pressing clip
terminal tier
wrong
pressing