Outline Of Heating Operation - Mitsubishi Heavy Industries SRK20ZD-S1 Technical Manual

(6) Outline of heating operation (Heat pump type only)
(a) Operation of major functional components
Functional
components
Indoor fan motor
Flaps
Display
52C
Outdoor fan motor
4-way valve
(b) Fan speed switching
Fan speed switching
Flow control
Air scroll
Swing flap
Swing stop
(i) 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.
(c) Thermostat operation
The compressor and outdoor fan and turned on and off as shown below according to the temperature setting.
(d) 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.
(i) When the compressor and outdoor unit fan are operating
OFF
Model : 20
Model : 28
Model : 40
Item
When the compressor
command is OFF
ON
ON or OFF
Lights up
ON
OFF
Depending on the stop mode
AUTO
Auto fan control
Speed 6
-5 -4
Compressor ON
outdoor fan
Set temp.
Speed 2
Speed 1
15 20
15 25
20 25
Indoor heat exchanger temp. (˚C)
When the compressor
command is ON
ON
ON or OFF
Lights up
ON
ON
ON
HIGH
Speed 6
Speed 6
Speed 6
Speed 4
-3 -2 -1
Thermostat setting point
OFF
+1
Room temp.
Speed 6
Speed 4
25 30
30 34
30 37
154
- -
When the compressor goes
OFF due to an abnormal stop.
OFF
Stop position control
Lights up or flashes
OFF after stop mode
OFF
Depending on the stop mode
MED
Speed 4
Speed 4
Speed 4
Speed 2
0
Auto fan control,
or the set fan speed
34
40
43
LOW
Speed 2
Speed 2
Speed 2