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92
FlexFit Pro
6. Functions
6.1
Indoor unit:
6.1.1 Dehumidication operation (no humidity sensor )
1. The indoor unit will stop and send a signal to shut off the outdoor unit when Tai<60*F
NOTE: I do not have a degree symbol, so I used the "*". Please insert the degree symbol.
2. While in cooling mode, the indoor unit will send a call for cooling to the outdoor unit when Tai>Tset+2 degrees F.
3. When Tset<Tai≤Tset+2 degrees F,,the indoor unit will send a dehumidication signal to the outdoor unit to start
the compressor. The unit will run for 10 minutes in low fan speed then shut off for 6 minutes. When it stops it will
send stopping signal to outdoor. When indoor unit failure, it will run 10 minutes in low speed and stop 6 minutes.
Timing cycle keep the same. Slave units determine the fan speed through the state what outdoor sent.
4. When the room temperature is less than or equal to the set temperature, the indoor fan will operate on low speed
and shut off the compressor.
6.1.2 Auto running:
1. When entering AUTO for the rst time, the operating mode will be decided by the outdoor unit mode, the room
temperature, and the set temperature. For example; if Tai is equal to or greater than Tset, the unit will enter the
cooling mode. If Tai is<Tset the unit will enter the heating mode.
2. If the system is in the cooling mode and it has been off for 15 minutes, and Tai+1+Tdif<Tset, the unit will start the
heating mode.
3. If the system is in the heating mode and it has been off for 15 minutes, and Tai is greater than or equal to
Tset+1+corrected+Tdif, the unit will start the cooling mode.
4. The unit will enter the SLEEP function (if set) in both heating and cooling modes, yet will not change modes after
15 minutes of run time as outlined above.
5. Changing from heating to cooling whille in the AUTO mode can only occur within 15 minutes after the compressor
stops.
6.1.3 Indoor fan control:
1. Auto fan speed control
Cooling mode ΔT=Tai-Tset ; heating mode ΔT=Tset-Tai
*First time to enter auto fan mode, if ΔT>2, choose high speed; ΔT≤0, choose low speed, another choose middle
speed. If temperature sensor is off ,choose low speed. (1 degree transformation temperature difference)
When the speed mode is auto high speed, if ΔT<2, the speed mode will change to auto middle speed.
When the speed mode is auto middle speed, if ΔT<0, the speed mode will change to auto low speed; if ΔT>3, the
speed mode will change to auto high speed.
When the speed mode is auto low speed mode, if ΔT>1, the speed mode will change to auto middle speed.
The speed transformation under auto speed mode: It will delay 3 minutes from high speed to low speed and no
delay from low to high.
Salve units determine the fan speed according to the state what outdoor has sent in the auto speed mode.
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