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_TROUBLE SHOOTING GUIDE BOOK __
The night low noise function is used to reduce the operating speed of the outdoor unit fans under normal
operating conditions in the evening while the outdoor unit is operating in the cooling mode.
■ Setting the function
Function Option
Night Low Noise Fn 3 oFF, op1~op12
■ Option Selection
Setting
Judgment Time
(Hr)
Operation Time
(Hr)
Noise
UXA UXB
op1 8 9 55 59
op2 6.5 10.5 55 59
op3 5 12 55 59
op4 8 9 52 56
op5 6.5 10.5 52 56
op6 5 12 52 56
op7 8 9 49 53
op8 6.5 10 49 53
op9 5 12 49 53
op10 Continuous Operation 55 59
op11 Continuous Operation 52 56
op12 Continuous Operation 49 53
•
Judgment Time : The time that the outdoor temperature is highest - Function starts time
•
Operation time : The time that the low noise operation function is maintained after the function is
turned on
•
Option : Determine the target noise level (limited Max FAN RPM by option step)
4.3 Night Low Noise
■ Detailed information
• This function is used with heat pump and heat recovery.
• Cooling mode is a change in the setting impact.
• Multi V 5 continuously monitors the building's cooling demand. On a rolling 24 hour basis, the peak
cooling demand is maintained and an internal timer begins counting hours since the peak demand
was set. Depending on which setting value is selected, Multi V 5's Night Low Noise function will de-
lay the beginning time of the restricted fan speed operation. Also, depending on which setting value
is selected, the restricted fan speed period time varies.
• Night Silent Operation
· Ask an authorized technician to setting a function.
· In case of setting the target noise level, cooling capacity can be decreased.
· In most applications, since the cooling load decreases during the night, setting this function has no
detrimental impact on cooling capacity.
· You can set the low noise mode control main agent by using wired remote controller (for details,
refer to the new standard remote controller's manual.
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