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Procedure:
Press the ADDRESS RESET switch SW3 (push button switch) on the outdoor unit circuit board continuously until LEDs 2 to 8 on
the outdoor unit circuit board are all illuminated (takes approx. 3.5 seconds).
Operation:
The outdoor unit will reset the addresses for the indoor units which it is connected to, and will send an instruction to carry out
automatic address setting again. If the indoor unit DIP switches have not been manually set for twin address setting, the indoor
units receive this command and they then clear their existing settings and carry out automatic address setting.
If an indoor unit has had its address set by the DIP switch (DIP switch 1-8 is ON), or if the remote control unit is connected to one
of the indoor units, then the addresses for those indoor units cannot be reset.
• • • • The indoor units will not run for approximately 1 minute while automatic twin address resetting is being carried out.
• • • • Do not turn off the power supply for at least 1 minute after automatic twin address resetting has been carried out.
18.2. Piping connections
• • • • The following table shows the pipe diameters for a twin-type system.
Outdoor unit main pipe diameter (mm)
34BB
Liquid side:
ø 9.52
Gas side:
ø 15.88
43BB
Liquid side:
ø 9.52
Gas side:
ø 19.05
• • • • The following table shows the equivalent pipe lengths and height differences for twin systems
Equivalent length
Branch pipe diameter
Branch pipe difference
Height difference
NOTE :
1. Use the main pipe to gain any rise or fall required for the pipes.
2. The number of bends should be 8 or less in a single system (L + la, L + Ib), and 15 or less overall.
3. Branch pipes should be positioned horizontally.
Indoor unit capacity (HP)
Branch pipe
diameter
Indoor unit capacity (HP)
Branch pipe
diameter
H1
Within 30 m
18BD3
Liquid side
ø 6.35
Gas side
ø 12.7
24BD3
Liquid side
ø 6.35
Gas side
ø 15.88
L + la + lb
la, lb
la - lb
Height difference between indoor units
39
Indoor unit combinations
18BD3
ø 6.35
ø 12.7
24BD3
18BD3
ø 6.35
ø 6.35
ø 15.88
ø 12.7
Within 50 m
Within 15 m
Within 10 m
H2
Within 1 m
28BD3
ø 9.52
ø 15.88
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