Mitsubishi FDUA125VNPWVH - Page 10

'22 • PAC-SM-412
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9
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(ii) Regardlessof the setting temperature, the cooling or heating operationmode is judged according to the "Judgment
basedonRoomtemperature/CoolingorHeatingandOutdoortemperature/CoolingorHeating".
1)

Incaseof"Roomtemperature/Cooling<Indoorreturnairtemperature"and"Outdoortemperature/Cooling<Out-
doorairtemperature"
⇒
Operationmode:Cooling
2)

Incaseof"Roomtemperature/Heating>Indoorreturnairtemperature"and"Outdoortemperature/Heating>Out-
doorairtemperature"
⇒
Operationmode:Heating
3)Theoutdoorairtemperatureoftheabovejudgmentconditionsissampledatevery10minutes.
4)Intherangewheretheabovecoolingandheatingzonesareoverlapped
⇒
ForcedthermostatOFF
Forced thermostat
OFF
Forced thermostat
OFF
Room temperature/Cooling Room temperature/Heating
Outdoor air temperature (°C)
Indoor return air temperature (°C)
Outdoor temperature/Heating
Outdoor temperature/Cooling
12
26
24
22
20
18
16
14
30
28
24 2612 14 16 18 28 3020 22
Forced thermostat OFF
Cooling
Heating
(ii) Regardless of the setting temperature, the cooling or heating operation mode is judged according to the "Judgment based on
Room temperature/Cooling or Heating and Outdoor temperature/Cooling or Heating".
1)
In case of "Room temperature/Cooling < Indoor return air temperature" and "Outdoor temperature/Cooling < Outdoor air tem
perature"
⇒
Operation mode: Cooling
2)
In case of "Room temperature/Heating > Indoor return air temperature" and "Outdoor temperature /Heating > Outdoor air tem
perature"
⇒
Operation mode: Heating
3) The outdoor air temperature of the above judgment conditions is sampled at every 10 minutes.
4) In the range where the above cooling and heating zones are overlapped
⇒
Forced thermostat OFF
Forced thermostat
OFF
Forced thermostat
OFF
Room temperature/Cooling Room temperature/Heating
Outdoor air temperature (℃)
Indoor return air temperature (℃)
Outdoor temperature/Heating
Outdoor temperature/Cooling
12
26
24
22
20
18
16
14
30
28
24 2612 14 16 18 28 3020 22
Forced thermostat OFF
Cooling
Heating
(2) Operations of functional items during cooling/heating
Cooling Heating
Dehumidifying
Fan
Operation
Functional item
Thermostat
ON
Thermostat
ON
Thermostat
OFF
Thermostat
OFF
Hot start
(Defrost)
Compressor
4-way valve
Outdoor unit fan
Indoor unit fan
Drain pump
(3)
(2) (2)
/ /
( )
( )
/
/
/
/
Thermostat ON:
Thermostat OFF:
(2)
/
(2)
Notes (1) : Operation : Stop / : Turned ON/OFF by the control other than the room temperature control.
(2) ON during the drain pump motor delay control.
(3) Drain pump ON setting may be selected with the indoor unit function setting of the wired remote control.
(3) Dehumidifying (DRY) operation
(a)
FDTC series
(i)
(ii)
(iii)
(iv)
Indoor ambient temperatures and humidity are controlled simultaneously with the relative humidity sensor (HS) and the
suction temperature sensor [Thi-A (or the remote control temperature sensor when it is activated)], which are installed at the
suction inlet.
When the operation has been started with cooling, if there is a difference of 2 °C or less between the suction and setting
temperatures, the indoor fan speed is lowered by one. This speed is retained for 3 minutes after changing the speed.
After the above condition, when a difference between suction and setting temperature is lower than 3°C, and the
relative humidity is high, the indoor fan speed is lowered by one.
When the difference between suction and setting temperature is larger than 3°C, the indoor fan speed is raised by one.
This speed is retained for 3 minutes after changing the speed.
When relative humidity becomes lower, the indoor fan speed is retained.
In case of the thermostat OFF, the indoor fan speed at the thermostat ON is retained.
(2) Operations of functional items during cooling/heating
Cooling Heating
Dehumidifying
Fan
Operation
Functional item
Thermostat
ON
Thermostat
ON
Thermostat
OFF
Thermostat
OFF
Hot start
(Defrost)
Compressor
4-way valve
Outdoor unit fan
Indoor unit fan
Drain pump
(3)










(2)





(2)




/ 




/ 

()
()

/ 
/

/
/
Thermostat ON: 
Thermostat OFF: 
(2)
/
(2)
Notes (1) : Operation : Stop /: Turned ON/OFF by the control other than the room temperature control.
(2) ON during the drain pump motor delay control.
(3) Drain pump ON setting may be selected with the indoor unit function setting of the wired remote control.
(3) Dehumidifying (DRY) operation
(a) FDT series