Daitsu FDLA-09, Installation, Operation & Service Manual

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Page 53 of 77
SK2019 FCSD(H)-V/P-ECM-001
PRE-HEAT
Without Electrical Heater
a) If Ti2 < 36ºC [or 28ºC depends on DIP setting], then MTV2 and AUX1 are on, then indoor fan remains off.
b) If Ti2 ≥ 38ºC [or 30ºC depends on DIP setting], then MTV2 and AUX1 are on, then indoor fan runs at set speed.
c) If indoor coil temperature sensor is damaged, then pre-heat time is set for 2 minutes and indoor fan runs at set speed.
With Electrical Heater
If indoor fan speed ≥ at Modbus 310000 setting, then the electrical heater is turned on.
POST HEAT
Without Electrical Heater
a) If Ti2 ≥ 38ºC, then MTV2 and AUX 1 are turned off. Indoor fan continues to run at set speed.
b) If 36ºC ≤ Ti2 ≤ 38ºC, then MTV2and AUX1 are turned off. Indoor fan maintains its original state.
c) If Ti2 < 36ºC, then MTV2 and AUX1 are turned OFF. Indoor fan is turned OFF.
d) If the indoor coil temperature coil is damaged, then post-heat time is set for 3 minutes. Indoor fan runs at set speed.
With Electrical Heater
Indoor fan will shut down after the unit has been turned off for 20 seconds.
OVER HEAT PROTECTION OF INDOOR COIL
a) If Ti2 ≥ 75ºC, then MTV2 and AUX1 are turned off, indoor fan remains on and runs at high speed.
b) If Ti2 < 70ºC, then MTV2 and AUX1 are 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 set times.
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
a) If the current running mode is AUTO COOL mode, it will change over to AUTO HEAT mode when all the following
conditions are met:
•
Ts – Tr ≥ 1ºC (or - 4ºC if economy contact is activated)
•
MTV1 has closed ≥ 10 min.
b) If the current running mode is AUTO HEAT mode, it will change over to AUTO COOL mode when all the following
conditions are met:
•
Tr – Ts ≥ 1ºC (or + 4ºC if economy contact is activated)
•
MTV2 has closed ≥ 10 min.
Note: AUTO COOL or AUTO HEAT operations are the same as COOL or HEAT mode respectively.