Outline Of Heating Operation - Mitsubishi SRK52HE Technical Manual

4.8 Outline of heating operation

(1) Operation of major functional components
Functional
components
Indoor fan motor
Flap and louver
Display
Outdoor fan motor
4-way valve
Electric expansion valve
*However, the outdoor fan motor doesn't stop for one minute after the compressor stops.
(2) Fan speed switching
Fan speed switching
Flow control
Air scroll
Swing flap or louver
Swing stop
(a) Auto fan control
The indoor fan is automatically controlled in accordance with the difference between the room temperature (detected by the
room temperature sensor) and the thermostat setting as shown below.
(3) Thermostat operation
The compressor and outdoor fan and turned on and off as shown below according to the temperature setting.
(4) Hot keep
This function controls the indoor unit fan speed as shown below in accordance with the temperature sensed by the indoor heat
exchanger sensor.
(a) Indoor unit fan control
0
9
8
7
6
5
4
3
2
1
OFF
A
Note (1) Refer to the table shown above right for the values A and B.
(b) To accomplish rapid recovery from the thermostat off state, after the compressor and outdoor unit's fan go OFF, the set
temperature is raised by 1ºC until 1 minute passes after the hot keep end temperature has been reached following restarting.
Item
When the compressor
command is OFF
ON
ON or OFF
Lights up
OFF*
Depending on the stop mode
AUTO
Auto fan control
Speed 9
-5 -4
ON
Compressor
Outdoor fan
Set temp.
B 26 27 28 29.5 31.5 33
Indoor heat exchanger temp. (˚C)
When the compressor
command is ON
ON
ON or OFF
Lights up
ON
ON
Depending on the EEV control
HIGH
Speed 9
Speed 9
Speed 9
Speed 7
-3 -2 -1
Thermostat setting point
OFF
+1
Room temp.
34.5 36 37.5 39 40.5 42
16
- -
When the compressor goes
OFF due to an anomalous stop.
OFF
Stop position control
Lights up or flashes
Depending on the stop mode
MED LOW
Speed 7 Speed 5
Speed 7 Speed 5
Speed 7 Speed 5
Speed 5
0
¡ Values of A, B
When the compressor
command is OFF
When the compressor
command is ON
A B
22 25
17 19