23
Installation Procedures
Cutting and Enlarging
Cutting or enlarging pipes should be proceeded by installation personnel according to the
operating criterion if the tube is too long or flare opening is broken.
Vacuumizing
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 flowing
into the machine.
Open All Valves
Open all the valves of outdoor units. [NB: oil balancing stop valve must be shut up completely
when only connected one main unit.]
Checkup for Air Leakage
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.
2Connecting 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.
3Pressing 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
terminal tier
pressing clip
wrong
pressing
Connecting
circular terminals:
Tubing Permissible Length & Height Difference
Please refer to the attached manual of outdoor units.
Connecting Procedures of Refrigerant Tubing
With the soft solder, the nitrogen-filling protection should be used.
Refrigerant Filling Amount
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 specified amount while compressor
failure can be caused by filling too much or little refrigerant.
Tubing Materials & Specifications
Special tools for R410A
should be used for cutting
and enlarging pipes.
Tubing
Material
Model
Tubing Size
(mm)
Gas pipe
Liquid pipe
6.35
9.52
Phosphor deoxybronze seamless pipe (TP
2
) for air
conditioner
DAV009
6.35
12.7
DAV012, DAV016
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