2. Control Functions
Control functions on the module
SMGB0082 rev.1 - 07/2015
36
2.1.16 Silence priority mode (Night shift) (Only in cooling operation)
It is possible to operate with a reduced fan noise, for instance at night. Silence priority mode becomes enabled by the input
of non-voltage contact. Therefore, it is possible to switch remotely between standard mode for the day and silence priority
mode for the night. (It is also possible to switch in the middle of operation)
For wiring
Control board of the chiller unit
Silence priority mode
Open: Disable
Closed: Enabled
Time chart
Silence priority
mode signal
Operation mode
of FAN
ON
OFF
Night shift
Standard
Cooling/Heating
Switch
Operation mode
of the system
Heating
Cooling
Heating
Cooling
Silence priority mode (Night shift)
Standard mode
Outdoor temperature (ºC)
High
pressure
(MPa)
Effect in silence due
to the reduction of fan
revolutions: about 1dB
(COP is equivalent to
high outdoor temperature)
N O T E
The figure is a example, and the actual effect will vary depending on temperature conditions and operation load state.
