Outline Of Heating Operation - Mitsubishi SRK Series Technical Manual

(16) Outline of heating operation

(a) Operation of major functional components in heating mode
Compressor
Indoor fan motor
Outdoor fan motor
4-way valve
*It can be set the indoor fan motor off or the heating thermostat OFF with connecting a wired remote control.
In the case, indoor air temperature is detected by sensor on the wired remote control.
(b) Details of control at each operation mode (pattern)
(i) Fuzzy operation
Fan speed
Auto
HI
MED
LO
ULO
(ii) Hot keep operation
During the heating operation, the indoor fan speed can be controlled based on the temperature of the indoor heat
exchanger (Th2) to prevent blowing out of cold air.
(c) Defrost operation
(i)
1)
After finish of defrost operation
2)
3)
4)
is as following.
Models SRK20, 25
0
5)
In case satisfied all of following conditions.
-5
• Connect compressor speed 0 rps 10 times or more.
• Satisfy 1), 2) and 3) conditions above.
• Outdoor air temperature is 3°C or less.
-10
(ii)
1)
-15
Continued operation time of defrost operation → For more than 17 minutes (models SRK35, 50 : 17 minutes and 30seconds).
2)
-20
-20
Thermostat ON
ON
ON
ON
ON
Model
SRK20
20-115rps
20-115rps
20-86rps
20-70rps
20-44rps
35 (Total compressor operation time)
35 (Total compressor operation time)
−
C or less for 3 minutes continuously.
Defrost operation
start
-15 -10 -5 0 5
Outdoor air temperature (℃)
Heating
Thermostat OFF
OFF
ON(HOT KEEP)*
OFF
(few minutes ON)
ON
SRK25 SRK35
20-115rps 20-115rps
20-115rps 20-115rps
20-104rps 20-108rps
20-84rps 20-96rps
20-54rps
20-60rps
Models SRK35, 50
0
-5
-10
(model SRK50 : 10 )
-15
-20
10 -20 -15
Outdoor air temperature (℃)
- -
69
'09•SRK-DB-087D
'18 • SRK-T-250
Failure
OFF
OFF
OFF
OFF
(3 minutes ON)
SRK50
20-110rps
20-110rps
20-106rps
20-94rps
20-63rps
are satisfied.)
is satisfied.)
Defrost operation
start
-10 -5 0 5 10