Daitsu FMCD-04 - Control Logics; LED Display and Error Description

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SK2019 FMCD-V-ECM-001
Control Logics
1. Power On Setting
When any fan speed is selected, the unit is turned on or modulating signal is more than 2Vdc. When all of the fan speed
inputs (H/M/L) are off and modulating signal is less than 2Vdc, the unit is turned off.
2. Alarm Protection and Error Display
a) If EC motor is failure, EH relay is turned OFF at once.
3. Louver
When the unit is turned on, the louver will open to the largest angle at 100º, then move to the operating angle at 87 º. When
the unit is turned off, the louver will close.
4. Signal Input
When modulating signal input is more than 2 VDC, the units is turned on. EC motor RPM will be changed by the signal
voltage.
5. Electrical Heater Operation
After unit is turned on, EH relay will be ON when EH signal is power on and EC motor RPM>300;
If EC motor failure or EC motor RPM is lower than 300RPM, EH relay is turned OFF at once and report error code.
6. 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.
LED Display and Error Description
For all units
Power / Operation LED light (both green)
Unit on
Power LED Off, Operation LED On
Unit in standby
Power LED On, Operation LED Off
For all units - Operation LED light (Green)
Item
Blink
LED Display
Reason
Remedy
Indoor coil sensor 1
failure
Green LED blinks 4
times, stops for 3s
E4
Ti1 sensor connection is
unplugged or damaged.
1. Check if Ti1 plug is connected or not.
2. Check if sensor’s resistance is correct
or not.
EC motor failure
Green LED blinks 9
times, stops for 3s
E9
No EC motor feedback
1. Check if EC motor’s wires are
connected.
2. Check the EC motor
Anti-frozen
Green LED blinks
11 times, stops for
3s
E11
When unit is standby,
Ti1<2ºC.
1. Turn on unit to keep Ti1 high than 5ºC