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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 fan speed. When power
supply resumes or the system is switched on again, the same operations as previously set will function.
On/Off Switch on LED Display 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
•
Before the electrical heater is turned on, the EH safety switch must be closed and the fan must be working.
•
If this contact is opened for ≥ 1 second or the fan is not working, the heater will be turned off immediately and report an
error and fan speed will change to high speed.
•
Once the contact is returned to the closed position ≥ 60 seconds, reset the error and the heater will start again.
•
When the EH safety switch is opened ≥ 3 times within 60 minutes the heater is not allowed to start anymore.
•
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 when the unit is off to prevent water from freezing in the coil.
If Unit with SW2=0 (2-pipe system), it is in Standby Mode
If Tr ≦ 2 ºC for 2 minutes, MTV1 is turned on. AUX1 is on. If Ti1 < 5ºC for 2 minutes, EH (if present) is switched on. Indoor fan
is turned on at low speed. If Tr ≧ 5ºC for 2 minutes, MTV1 is turned off. AUX1 is off. Electric Heater is turned off. Indoor fan is
switched off.
If Unit with SW2=1 (4-pipe system), it is in Standby Mode
If Tr ≦ 2 ºC for 2 minutes, MTV2 is turned on. AUX1 is on. If Ti2 < 5ºC for 2 minutes EH (if present) is switched on. Indoor fan
is turned on at low speed. If Tr ≧ 5ºC for 2 minutes, MTV2 is turned off. AUX1 is off. Electric Heater is turned off. Indoor fan is
switched off.
Page 30 of 48
SK2019 EU FDHD-V/P-AC-001
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