SiBE04-101
General Functions
Main Function
29
1.9
Outdoor Unit Silent Operation
Outline
This air conditioner is provided with a switch to prevent next-door neighbors from annoyance of operation
noise when it is installed in a heavily built-up area. (The indoor air volume is left as set by user for measure
not to annoy neighbors.)
Details of the
Action
1. Starting the function
In cooling, heating and auto modes (including stopping), the function starts when the [SILENT] button is
pressed.
This button, when pressed during stop, becomes effective when the operation is started.
The [SILENT] function becomes ineffective during powerful operation in which the performance has
priority, as well as in dry mode and fan mode in which the [SILENT] function is ineffective.
2. Details of function
The function includes decrease in the outdoor fan rotating speed and setting of the upper limit of the
compressor frequency.
(1) Outdoor fan rotating speed
Refer to the description in the “Fan Speed Control for Outdoor Units”.
(2) Compressor frequency
In this function, the upper limit of the compressor frequency should be as follows:
3. End of Function
The function ends when the [SILENT] button is pressed again or the powerful operation button is pressed
during [SILENT] operation.
If it is necessary to reduce the outdoor unit operating noise further even in outdoor unit silent operation,
the upper limit of the compressor rotating speed can be lowered by cutting the jumper wire on the
outdoor PCB.
Decrease in the compressor rotating speed lowers the performance but gives further 0.5 to 1.0 dB
noise reducing effect.
Refer to the description in the On-site Setting Jumper Wire.
Refer to the description in the On-site Setting Jumper Wire on page 44.
Class
Heating
Cooling
50
64 Hz
62 Hz
60
52 Hz
52 Hz
71
46 Hz
46 Hz
SiBE04-101.book Page 29 Monday, October 15, 2001 3:08 PM
