Hyundai HSH-121NBE, Service Manual

Page: 232 / 259

5
5
.
.
C
C
O
O
N
N
T
T
R
R
O
O
L
L
M
M
O
O
D
D
E
E
L
L
c.
When T
room
– T
set
＜ -3 ℃ , it starts in the heating mode.
After the first run in the cooling or heating mode, the mode will be changed as the following:
a.
When T
room
– T
set
＞ 3 ℃ , it will be changed to the cooling mode;
b.
When T
room
– T
set
＜
-3
℃
, it will be changed to the heating mode;
c.
When these conditions are not met, it will remain in the previous run mode.
When the temperature setting is changed, re-judgment will be made for the run mode
according to the descriptions mentioned above; when the compressor is halted for 10 minutes,
the re-judgment will be made for the run mode.
5-3-6-1 Switch between the cooling and heating mode:
5-3-6-2 Cooling
→
heating turnover operation
Cooling
→
heating: the compressor stops; 50 s later the 4-way valve is activated and 3 minutes
more the compressor turns on.
Heating
→
cooling: the compressor stops, 50 s later the 4-way valve is interrupted and 3
minutes more the compressor turns on.
5-3-6-3 There is temperature compensation during the auto-run, which is same as cooling and
heating.
5-3-7 Cooling-run mode
5-3-7-1 Temperature compensation
Principle for compensation: The compensation is available only if the proper sensor is used
T
ambient
t
set
+3
t
set
t
set
-3
Cooling He ating mode Cooling
230