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On/Off Switch On The Front Panel
a) This is a TACT switch to select Cool→Heat→Off operation mode.
b) In COOL mode, the set temperature of the system is 24ºC with auto fan speed. There are no timer and sleep modes.
c)
In HEAT mode, the set temperature of the system is 24ºC with auto fan speed. There are no timer and sleep modes.
d) Master unit that does not use a wall pad will globally broadcast.
NOTE
When button pressing is effective, the master unit buzzer will beep twice and the slave unit will beep once.
Electric Heater Safety Switch
a)
Before the electrical heater is turned on, the EH safety switch must be closed and EC motor RPM must be more than
Modbus 310000 setting.
b)
When electrical heater is ON, electrical heater safety switch is opened for ≥ 1 second or EC motor RPM is lower than
Modbus 310000 setting, EH will be turned off immediately and report an error and fan speed is changed to high speed.
c)
Once the contact is returned to the closed ≥ 180 seconds, reset the error and the heater will start again.
d)
When the EH safety switch is opened ≥ 3 times within 60 minutes the heater is not allowed to start anymore.
e)
Turn off the unit to reset the fault, provided that the switch has returned to the closed position.
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.
If Unit with SW2=0 (2-pipe system), is in Standby Mode
If Tr ≦ 2 ºC for 2 minutes
1. MTV1 is turned ON
2. AUX1 is closed
3. DA2 is 10 VDC
4. If Ti1 < 5ºC for 2 minutes EH (if present) is switched on
5. Indoor fan is turned on at low speed
If Tr ≧ 5ºC for 2 minutes
1. MTV1 is turned OFF
2. AUX1 is open
3. DA2 is 0 VDC
4. Electric Heater is turned OFF
5. Indoor fan Switched OFF
If Unit with SW2=1(4-pipe system), is in Standby Mode
If Tr ≦ 2 ºC for 2 minutes
1. MTV2 is turned ON
2. AUX1 is closed
3. DA3 is 10 VDC
4. If Ti2 < 5ºC for 2 minutes EH (if present) is switched ON
5. Indoor fan is turned on at low speed
If Tr ≧ 5ºC for 2 minutes
1. MTV2 is OFF
2. AUX1 is open
3. DA3 is 0 VDC
4. Electric Heater is turned OFF
5. Indoor fan Switched OFF
Page 40 of 71
SK2019 FSTD-SLIM-EC-FLEX-001_01
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