Outdoor Unit - Mitsubishi Heavy Industries FDTQ22KXE6F Technical Manual

(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
(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
30
28
26
Forced thermostat OFF
24
22
Forced thermostat
OFF
20
18
16
Heating
14
12
12 14 16 18
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
Forced thermostat
OFF
20 22 24 26 28
Heating
Thermostat Thermostat
ON OFF
/ /
/ (2)
118
- -
83
-
'16 • PAC-T-251
'20 • KX-T-347
Outdoor temperature/Heating
Outdoor temperature/Cooling
30
Dehumidifying
Hot start
(Defrost)
/
( )
( )
/
/
/
Thermostat ON:
Thermostat OFF: (2)