Protective Control Function; Frost Prevention Control; Cooling Overload Protective Control - Mitsubishi Electric DXK09ZJ-S Technical Manual

Indoor air temperature (˚C)
(b)
1)
When both the indoor and the outdoor air temperatures are in the range "A", cooling or heating is switched depending on
2)
the difference between the setting temperature and the indoor air temperature.
When the operation mode has been judged following the change of setting temperature with the remote controller, the hourly
3)
judgment of operation mode is cancelled.
(c)
(d)
Cooling
Setting
Dehumidifying
temperature
Heating

(12) Protective control function

(a) Frost prevention control
1) Operating conditions
a)
b)
2) Detail of anti-frost operation
Indoor heat exchanger
Item
Lower limit of compressor command speed
Indoor fan
Outdoor fan
4-way valve
3) Reset conditions:
a)
b)
(b) Cooling overload protective control
1) Operating conditions:
2) Detail of operation
a)
b) The lower limit of compressor command speed is set to 30 or 40 (model 18 : 29) rps and even if the calculated result
becomes lower than that after fuzzy calculation, the speed is kept to 30 or 40 (model 18 : 29) rps. However, when the
thermo becomes OFF, the speed is reduced to 0 rps.
3) Reset conditions:
a)
b)
(c) Cooling high pressure control
18.0
–6 –5 –4
temperature 5°C or lower
(model 18 : 23 rps)
more, or 47ºC or more (model 18 : 41ºC or more) with the compressor running, the lower limit
Item
Outdoor air temperature
Lower limit speed
A Dehumidifying
Heating
18
Outdoor air temperature (˚C)
Signals of wireless remote controller (Display)
±0
–3 –2 –1
2.5°C or lower
Model
DXK09, 12ZJ-S

- -
'11 • SRK-T-118
30
+1 +2 +3 +4
'09•SRK-DB-087D
compressor
command
speed
Lower
limit
speed
0 rps
2.5 5
Indoor heat exchanger
temperature (ºC)
DXK18ZJ-S
41°C or more
+5 +6
8
29 rps