Si18-201 System control
Main Functions 139
3.21 Nighttime Low Noise Control
Purpose of the
Function
This function lowers the operating sound when the noise causes problems during the night.
Outline The function turns the nighttime low-noise instruction ON and OFF according to the outside
temperature condition.
∗
Function start condition
When the nighttime low-noise permit is set (jumper setting), the following control is activated.
Details During normal cooling operation, outside temperature DOA is detected every 90 minutes. The
maximum value of 16 outside temperature measurements is compared with the outside
temperature, and the nighttime low noise is determined based on the following condition.
Outside air
temperature
Maximum outside
air temperature (-4 deg.)
Maximum outside
air temperature (-6 deg.)
Nighttime low noise mode command
ON
OFF
(M1029)
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