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SK2014-SON-002-TechMnl-SWC-003
f)
When the unit is turned off, indoor fan shut down after 5 seconds.
LOW TEMPERATURE PROTECTION OF INDOOR COIL
a) If Ti1 ≤ 2ºC for 2 minutes, AUX2 is turned off. If low speed is selected via user interface, indoor fan runs at
medium speed. If medium or high speed is selected via user interface, indoor fan runs at set speed.
b) If Ti1 ≥ 5ºC for 2 minutes, AUX2 is turned on. Indoor fan runs at set speed.
FAN MODE
a)
Indoor fan runs at the set speed while heater, AUX1, AUX2, MTV1 and MTV2 are turned off.
b)
Indoor fan speed can be adjusted to low, medium and high.
HEAT MODE
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 runs at 200rpm.
d)
The range of Ts is 16 - 30ºC.
e)
Indoor fan speed can be adjusted to low, medium, high and auto.
PRE-HEAT
Without Electrical Heater
a)
MTV1, MTV2 and AUX2 are off.
b)
If Ti1 < 36ºC (or > 28ºC is selected by DIPB-S2 position SW4), then AUX1 is turned on
while indoor fan remains off.
c)
If Ti1 ≥ 38ºC (or < 30ºC is selected by DIPB-S2 position SW4), then AUX1 is turned on
while indoor fan runs at set speed.
d)
If the indoor coil temperature sensor is damaged, then the pre-heat time is set for 2
minutes and the indoor fan runs at set speed.
POST-HEAT
a)
AUX1 is turned off. Electrical heater is turned off.
b)
Indoor fan will shut down after the unit has been turned off for 20 seconds.
LOW TEMPERATURE PROTECTION OF INDOOR COIL
a) If Ti1 ≤ 2ºC for 2 minutes, then AUX2 is turned off. If indoor fan runs at low speed, then it will run
at medium speed. If indoor fan runs at medium or high speed, then it will run at set speed.
b) If Ti1 ≥ 5ºC for 2 minutes, then AUX2 is turned on. Indoor fan runs at set speed.
OVER-HEAT 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 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 the indoor fan and AUX2 will be turned on for 3 minutes, and then off
for 4 minutes.
c)
If 16ºC ≤ Tr < 25ºC, then the indoor fan and AUX2 will be turned on for 3 minutes, and
then off for 6 minutes.
d)
If Tr < 16ºC, then the indoor fan and AUX2 will be turned off for 4 minutes.
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.
AUTO-MODE
Not allowed.
C.1.6.
Control Logics for 4-Pipe System
Note: 4-pipe system must always be equipped with 2 valves.
COOL MODE
a)
MTV2, AUX1 and Electrical Heater are always off.
