Haier AB072MRERA - Page 260

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Tubing Materials & Specications
Pipe Length & Height Difference
Refrigerant Recharge Amount
Connecting Procedures of Refrigerant Tubing
Please refer to the attached manual of outdoor units.
Special tools for R410A should be used
for cutting and enlarging pipes.
Model
AD072-
092MLERA
AD122-
182MLERA
AD242
MLERA
Tubing Size
(mm)
Gas pipe Φ9.52 Φ12.7 Φ15.88
Liquid pipe Φ6.35 Φ6.35 Φ9.52
Tubing
Material
Phosphor deoxy bronze seamless pipe (TP2) 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 and Enlarging
Vacuumizing
Open All Valves
Checkup for Air Leakage
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 master unit.]
Check if there is any leakage at the connecting part and bonnet with hydrophone or soapsuds.
Connecting
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.