Outline Of Microcomputer Control Function; Operation Control Function By The Indoor Controller; Automatic Operation (Only Heat Pump Type); Room Temperature Control (Differential Of Thermostat) - Mitsubishi FDTN208HEN-S Instruction Manual

FDTN-H
(4)

Outline of microcomputer control function

(a) Operation control function by the indoor controller
1)

Automatic operation (Only heat pump type)

If the Auto mode is selected on the remote control device, the selection of cooling or heating can be made automatically
depending on the room temperature (and the temperature of indoor heat exchanger). (When the switching between the
cooling and the heating is made within 3 minutes, the compressor will not operate for 3 minutes.) This will make much
easier the switching of cooling/heating at the change of season and can be adapted to the unmanned operation at bank
cash dispenser.
Heating operation
Room temp. (detected at Th
Ready for
heating
Indoor heat exchanger temperature (˚C)

2) Room temperature control (Differential of thermostat)

Heating operation
Temperature difference between thermostat set temp.
and return air temp. (Detected by ThI-A)
3) Control parts operation during cooling and heating
Function
Control part
Compressor
4-way valve
Outdoor fan
Indoor fan
Louver motor
Condensate motor
Electric heater
Note(1)
:ON
× :OFF
/ × :According to control other than temperature control.
244
Cooling operation
Setting room temp.
) [deg]
1-A
Suspended heating operation
OFF (52C)
° °
+1 C
-1 C
Set temp.by thermostat
Cooling Fan
Thermostat Thermostat
–
ON OFF
× ×
× × ×
× ×
× (2min. ON) × (2min. ON)
× ×
Notes (1) During the automatic switching of cooling/heating the
room temperature is controlled based on the setting
of room temperature (DIFF:±}1 deg)
(2) If the temperature of indoor heat exchanger rises be-
yond 63˚C during the heating operation, it is switched
automatically to the cooling operation. For an hour
after this switching, the heating operation is suspended
regardless of the temperature as shown at left.
Cooling operation
ON (52C)
OFF (52C)
°
-1 C
Temperature difference between thermostat set
temp. and return air temp. (Detected by ThI-A)
Heating
Thermostat Thermostat
Defrost
ON OFF
×
× ×
× ×
/ ×
/ ×
× (2min. ON)
/ × ×
°
+1 C
Set temp.by thermostat
Dry
Thermostat Thermostat
HOT START
ON OFF
×
× ×
×
× (2min. ON)
×