26
Condensing Unit
Service Manual
otherwise the pipes may crack or break.
Do not wrap the protective tape too tight, otherwise the efciency of thermal insulation may be decreased.
Ensure that the condensate drainage exible tube is separate from the bundled pipes.
After the protective work is completed and the pipes are wrapped, use seal material to block the hole in the
wall, so as to prevent rain and wind from entering the room.
3.2 Caution in Connecting Pipes
Arrangement of connecting pipes shall be performed according to sit conditions with reference to the
following principles.
Try to shorten the length of connecting pipes, within 5m for the better.
Try to reduce height difference between indoor unit and outdoor unit.
Try to reduce number of joint bends of connecting pipes.
If the length of connecting pipes is more than 20m, adequacy of lubricant of the system must be checked;
and if necessary, add more lubricant properly.
Filling amount of refrigerant in the system is matched to a 7m connecting pipe. If the connecting pipe is
needed to lengthen, appropriate amount of refrigerant should be added. How much refrigerant should be
added for every meter extension refers to the following table. Allowable maximum pipe length is 30m.
If height difference between indoor unit and outdoor unit exceeds 10m in installation of air conditioner, an
oil return bend must be mounted at an interval of 6m.
If heights of indoor unit and outdoor unit are different, pipes should be laid out with reference to Figure 3-2-
1.
3.3 Specication of Connection Pipe
Mode
External Diameter
Maximum Length
of Connection Pipe
Maximum Difference
in Height between
Outdoor and Indoor Unit
Additional Charge
of Refrigerant
Gas Pipe Liquid Pipe (m) (m) (m)
HNTF24/A-D 3/8 5/8 15 15 0.6
HNTF36/A-D 3/8 3/4 30 15 0.6
HNTF48/A-D 3/8 7/8 30 15 0.6
HNTF60/A-D 1/2 7/8 30 15 1.2
4 ELECTRIC WIRING WORK
4.1 Wiring Principle
4.1.1General
Perform wiring of the power supply in conformance with the regulations of the local electric company.
For the control wires connecting indoor units, and between indoor and outdoor units, use of double-core
shield wires is recommended to prevent noise trouble.
Be sure to set the earth leakage breaker and the switches to the power supply section of the indoor unit.
Supply power to each outdoor unit and provide an earth leakage breaker or hand switch for each outdoor
unit.
Store wiring system for control and refrigerant piping system in the same line.
Arrange the cables so that the electric wires do not come to contact with high-temperature part of the
refrigerant pipe; otherwise coating melts and an accident may be caused.
Do not turn on power of the indoor unit until vacuuming of the refrigerant pipe will nish.
Installation should be conducted by National Wiring Regulation.
The rated voltage and exclusive power supply must be adopted for the air conditioners.
The power cable should be reliable and xed, in order to avoid the wiring terminal be suffered from force.
And do not drag the power cable forcibly.
The wire diameter of power cable should be large enough, if power cable and connection wire be
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