Daitsu FDLA-09, Installation, Operation & Service Manual

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Page 25 of 59
SK2015 SWC ‐ V ‐ EC ‐ 001
DEHUMIDIFICATION MODE
a) MTV2, AUX1 and heater are always off.
b) If Tr ≥ 25ºC, then MTV1 and AUX2 will be ON for 3 minutes, and then OFF for 4 minutes.
c) If 16ºC ≤ Tr < 25ºC, then MTV1 and AUX2 will be ON for 3 minutes, and then OFF for 6 minutes.
d) If Tr < 16ºC, then MTV1 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.
AUTOMODE
Without Electric heater and With Electric Heater as Booster
a) Every time the unit is turned on, MTV1 is on while AUX1, AUX2 and fan are off. MTV2 and the heater are
always off. After 120 seconds, the subsequent operation mode is decided according to the following:
i. If the coil temperature sensor (Ti1) ≥ 36°C, then MTV1, AUX1 and fan turn on or off
according to HEAT mode.
ii. If Ti1 < 36°C, then MTV1, AUX2 and fan turn on or off according to COOL mode.
b) Unit remains in AUTO COOL or AUTO HEAT mode throughout the operating cycle until the user changes the
mode manually or restarts the unit.
c) Should the Ti1 sensor fail or be damaged, auto mode will not function.
With Electric Heater as Primary Heat Source
a) If the current running mode is AUTO COOL mode, it will change over to AUTO HEAT mode upon satisfying all
the conditions below:
i. Ts ‐ Tr ≥ 1°C (or – 4ºC if economy contact is activated).
ii. MTV1 has stopped ≥ 10 minutes.
b) If the current running mode is AUTO HEAT mode, it will change over to AUTO COOL mode upon satisfying all
the conditions below:
i. Tr ‐ Ts ≥ 1°C (or + 4ºC if economy contact is activated).
ii. MTV1 has stopped ≥ 10 minutes.
Note: AUTO COOL or AUTO HEAT operations are the same as COOL or HEAT mode respectively.