16
REFRIGERANT PIPE CONNECTION
Caution
Align the centrelines of the pipes.
Tighten the flare by hand at first, then
tighten to the torque setting as detailed
in the table below. Use two spanners as
shown in Fig. 59
Tightening flare connection
Excessive torque can break the flare nut.
Use only specified torque.
Fig.59
Pipe
Flare nut
Pipe
Fig.58
Electric safety regulations for installation
1. If there is a serious safety issue regarding the power supply, technicians should refuse to install the system,
and fully explain the issue to the client to gain a resolution.
2. Power supply voltage should be in the range of 90%~110% of rated voltage.
3. The circuit breaker and main power switch shall have a rating of 1.5 times the maximum current of the
unit should be installed in power circuit.
4. Ensure that the system is earthed properly.
7. An individual electrical circuit and single power outlet must be used for the unit. Do not share the electrical
5. Wiring shall be in accordance with the Electrical Connection Diagram located on the access panel of the
outdoor unit.
6. All wiring must comply with all local and national electrical standards and codes and be installed by
qualified and skilled electricians.
Electrical work
Outside
diameter
Tightening
torque(N.cm)
Additional tightening
torque(N.cm)
6.35
12.7
9.52
1500
(153kgf.cm)
1600
(163kgf.cm)
3500
(357kgf.cm)
3600
(367kgf.cm)
2500
(255kgf.cm)
2600
(265kgf.cm)
circuit with other electrical devices.
When selecting a 7.0kW indoor unit, it must be connected to
the “A” circuit on the outdoor unit to ensure the appropriate
pipe size for a unit of this size. See Fig. 60
Indoor Unit Capacity kW
Liquid (mm/In)
Gas (mm/In)
2.0 / 2.5 / 3.5
7.0
5.0
Selecting a 7.0kW Indoor Unit
Fig.60
Pipe sizes for all indoor units is as follows:
C (6.35 / 1/4)
6.35 / 1/4
6.35 / 1/4
6.35 / 1/4
9.53 / 3/8
12.70 / 1/2
15.88 / 5/8
C (9.53 / 3/8)
B (6.35 / 1/4)
B (9.53 / 3/8)
A (6.35 / 1/4)
A (12.70 / 5/8)
