Mitsubishi Heavy Industries V Multi FDC71VNX Technical Manual page 101

(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
perature" ⇒ Operation mode: Cooling
air tem
2) In case of "Room temperature/Heating > Indoor return air temperature" and "Outdoor temperature /Heating > Outdoor
perature" ⇒ Operation mode: Heating
air tem
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
30
28
26
24
22
20
18
16
14
12
(2) Operations of functional items during cooling/heating
Operation
Thermostat
Functional item
Compressor
4-way valve
Outdoor unit fan
Indoor unit fan
(3)
Drain pump
Notes (1) : Operation
(2) ON during the drain 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
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 sensor when it is activated)], which are installed at the suction inlet.
(a) 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 tap of indoor fan is lowered by one tap. This tap is retained for 3 minutes after changing the tap.
(b) After the above condition, when a difference between suction and setting temperature is lower than 3°C, and the relative
humidity is high, the tap of indoor unit fan is lowered by one tap.
When the difference between suction and setting temperature is larger than 3°C, the fan of indoor unit fan is raised by one
tap. This tap is retained for 3 minutes after changing the tap.
(c) When relative humidity becomes lower, the indoor unit fan tap is retained.
(d) In case of the thermostat OFF, the indoor unit fan tap at the thermostat ON is retained.
Room temperature/Cooling
Forced thermostat OFF
Forced thermostat
OFF
Heating
12 14 16 18 20 22
Indoor return air temperature (℃)
Cooling
Fan
Thermostat
ON OFF
(2) (2)
: Stop / : Turned ON/OFF by the control other than the room temperature control.
-
-
Room temperature/Heating
Cooling
Outdoor temperature/Heating
Outdoor temperature/Cooling
Forced thermostat
OFF
24 26 28 30
Heating
Thermostat Thermostat
ON OFF
/ /
/ (2)
100
-
118
-
'19 • PAC-T-327 '16 • PAC-T-251
Dehumidifying
Hot start
(Defrost)
/
( )
( )
/
/
/
Thermostat ON:
Thermostat OFF: (2)