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D.4.2. Without Valve Configuration
COOL MODE
a) Electric heater, AUX1, MTV1 and MTV2 are always off.
b) If Tr ≥ Ts + 1ºC (or + 4ºC if economy contact is activated), then cool operation is activated and AUX2 is turned on. Indoor
fan runs at set speed.
c)
If Tr < Ts, then cool operation is terminated and AUX2 is turned off. Indoor fan is turned off.
d) The range of Ts is 16 - 30ºC
e) Indoor fan speed can be adjusted to low, medium, high and auto.
Note: When the unit is turned off, the indoor fan shut down after 5 seconds.
LOW TEMPERATURE PROTECTION OF INDOOR COIL
a) If Ti1 ≤ 2ºC for 2 minutes, then AUX2 is turned off. If low speed is selected via user interface, then indoor fan runs at
medium speed. If medium or high speed is selected via user interface, then indoor fan runs at set speed.
b) If Ti1 ≥ 5ºC for 2 minutes, then AUX2 is turned on. Indoor fan runs at set speed.
FAN MODE
a) Indoor fan runs at the set speed while heater, MTV1, MTV2, AUX1 and AUX2 are turned off.
b) Indoor fan speed can be adjusted to low, medium and high.
HEAT MODE
Heat mode without electrical heater
a) MTV1, MTV2, AUX2 and heater are always off.
b) If Tr ≤ Ts - 1ºC (or - 4ºC if economy contact is activated), then heat operation is activated and AUX1 is turned on. Indoor
fan runs at the set speed.
c)
If Tr > Ts, then heat operation is terminated and AUX1 is turned off. Indoor fan repeatedly runs at low fan speed for 30
seconds and then stops for 3 minutes.
d) The range of Ts is 16 - 30ºC.
e) Indoor fan speed can be adjusted to low, medium, high and auto.
PRE-HEAT
Pre-heat without electrical heater
a) MTV1, MTV2 and AUX2 are off.
b) If Ti1 < 36 ºC [or 28 ºC depending on DIP setting], AUX1 is on while indoor fan remains off.
c)
If Ti1 ≥ 38 ºC [or 30 ºC depending on DIP setting], AUX1 is on while indoor fan runs at set speed.
d) If indoor coil temperature sensor is damaged, pre-heat time is set for 2 minutes and indoor fan runs at set speed.
OVERHEAT PROTECTION OF INDOOR COIL
a) If Ti1 ≥ 75ºC, then AUX1 is turned off, indoor fan remains on and runs at high speed.
b) If Ti1 < 70ºC, then AUX1 is turned on, indoor fan remains on and runs at set speed.
c)
If the indoor coil temperature sensor is damaged, then the protection mode will be overridden and the unit will work
according to the pre-heat and post-heat program.
DEHUMIDIFICATION MODE
a) MTV1, MTV2, AUX1 and heater are always off.
b) If Tr ≥ 25ºC, then indoor fan and AUX2 will be ON for 3 minutes, and then OFF for 4 minutes.
c)
If 16ºC ≤ Tr < 25ºC, then indoor fan and AUX2 will be ON for 3 minutes, and then OFF for 6 minutes.
d) If Tr < 16ºC, then indoor fan and AUX2 will be turned off.
e) At the end of the above dehumidification cycle, the system will decide the next dehumidification control option. Indoor
fan will run at low speed throughout the dehumidification process.
AUTOMODE
Not available.
Page 26 of 48
SK2019 EU FDHD-V/P-AC-001
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