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Control Logics Specification
Unit Power On/Off
a) The unit is turned ON when any of the fan speed inputs (H/M/L) are ON, or modulating signal input is more than2.0 VDC.
b) The unit is turned OFF only if all of the fan speed inputs (H/M/L) are OFF and modulating signal input is less than 2.0 VDC.
Alarm Protection and Error Display
a) If the float switch is open for 5 minutes or EC motor is failed, then the (NC) voltage-free alarm contact shall be open and
the (NO) voltage free alarm contact shall be closed.
b) If the float switch is open for 10 minutes or EC motor is failed, the LED display reports a condensate management failure.
Drain Pump Operation
a) When the unit turns ON:
i.
If Ti1 < 14ºC, the drain pump turns ON.
ii.
If 14ºC<=Ti<16ºC, the drain pan keeps original state.
iii.
If Ti1 ≥ 16 ºC, the drain pump turns OFF.
b) When the unit turns OFF , the drain pump will remain ON for 5 minutes and then turn OFF.
c)
At any time:
i.
If the float switch is OPEN, the drain pump will turn ON.
ii.
If the float switch is OPEN and then CLOSED, the drain pump will remain ON for 5 minutes, and then turn OFF.
Modulating Signal Input
a) The standard configuration is for 0~5VDC modulating signal input.
b) The optional configuration is for 0~10VDC modulating signal. To set the PCB to the optional configuration, the S1 jumper
must be closed.
Electrical Heater Operation
a) After unit is turned on, EH relay will be ON when EH signal is power on and EC motor RPM>300
b) If EC motor failure or EC motor RPM is lower than 300RPM, EH relay is opened at once.
Low Temperature Protection of Indoor Coil in Winter
This is frost protection for when the unit is off to prevent water in the coil and room from freezing.
Unit is in Standby Mode
If Ti1≦ 2 ºC for 2 minutes, report error code and Buzzer is beeping for 3minutes.
Page 50 of 71
SK2019 FSTD-SLIM-EC-FLEX-001_01
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