Outline Of Heating Operation - Mitsubishi Heavy Industries SRK15ZTL-W Service Manual

(18) Outline of heating operation
(a) Operation of major functional components in heating mode
Compressor
Indoor fan motor
Outdoor fan motor
4-way valve
*When a wired remote control is connected, a signal of a wired remote control is priority. HOT KEEP, Fireplace,
Interval and Stop can be established.
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)
2) After finish of defrost operation
3)
4)
is as following.
Models SRK15-35
0
-5
-10
-15
-20
-20
Thermostat ON
ON
ON
ON
ON
Model
SRK15
20-110rps
20-110rps
20-110rps
20-60rps
20-44rps
35 (Total compressor operation time)
35 (Total compressor operation time)
(TH1)
−
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
SRK20 SRK25
20-110rps 20-115rps
20-110rps 20-115rps
20-110rps 20-115rps
20-70rps 20-84rps
20-44rps 20-50rps
Model SRK50
0
-5
-10
-15
-20
10 -20 -15
Outdoor air temperature (℃)
11
- -
'22 • SRK-SM-349
Failure
OFF
OFF
OFF
OFF
(3 minutes ON)
SRK35
20-115rps
20-115rps
20-115rps
20-96rps
20-50rps
are satisfied.)
Defrost operation
start
-10 -5 0 5 10
SRK50
20-110rps
20-110rps
20-100rps
20-80rps
20-50rps