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Sleep Mode
a) The sleep mode can only be set when the unit is in cool mode or heat mode.
b) If the sleep mode is activated when the unit is in cool mode, then the indoor fan will run at low speed and Ts will increase
by 2ºC over 2 hours.
c)
If the sleep mode is activated when the unit is in heat mode, then the indoor fan will run at set speed and Ts will decrease
by 2ºC over 2 hours.
d) Changing the mode of operation will cancel the sleep mode.
The cool mode sleep profile is:
Set temperature
Ts+2.0
Ts+1.0
Ts+0.5
Ts
0.5
1.0
Sleep on
Auto Fan Speed
COOL MODE
Fan speed cannot change until it has run for more than 30
seconds.
After 30 seconds the fan speed is modulated according to the difference between the room temperature and the set
temperature. The controller adjusts the motor signal input from 0 to 5VDC by PID calculation every 10 seconds. The air flow is
adjusted from 15% to100%.
Modulating Valve Control Under Energy Saving Mode
If the modulating valve is used, the water flow is adjusted from Modbus 310015 setting to 100% according to the room
temperature and set temperature. The controller adjusts the modulating valve signal input from Modbus 310015 setting to
10VDC by PID calculation for time interval according to Modbus 310007 setting.
Buzzer
If a command is received by the fan coil unit, the master unit will respond with 2 beeps for each setting, while the slave unit
will respond with 1 beep.
Auto Restart
The system uses non-volatile memory to save the present operation parameters when system is turned off or in case of
system failure or cessation of power supply. Operation parameters are mode, set temperature and the fan speed. When
power supply resumes or the system is switched on again, the same operations as previously set will function.
2.0
Sleep off
Set temperature
Sleep on
Ts
Ts-0.5
Ts-1.0
Hour
Ts-2.0
HEAT MODE
Fan speed cannot change until it has run for more than 30
seconds.
The heat mode sleep profile is:
2.0
1.0
0.5
SK2019 FSTD-SLIM-EC-FLEX-001_01
Page 39 of 71
Sleep off
Hour
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