Service manual

54
13.7 Quiet Operation (Heating)
 Purpose
o To provide quiet heating operation compare to normal operation.
 Control condition
o Quiet operation start condition
 When “POWERFUL/QUIET” button at remote control is pressed.
Quiet LED illuminates.
o Quiet operation stop condition
 When one of the following conditions is satisfied, quiet operation stops:
 Stop by OFF/ON button.
 Timer “off” activates.
 POWERFUL/QUIET button is pressed again.
 When quiet operation is stopped, operation is shifted to normal operation with previous setting.
 When fan speed is changed, quiet operation is shifted to quiet operation of the new fan speed.
 When operation mode is changed, quiet operation is shifted to quiet operation of the new mode.
 During quiet operation, if timer “on” activates, quiet operation maintains.
 After off, when on back, quiet operation is not memorised.
 Control contents
o Fan speed auto
 Indoor FM RPM depends on pipe temperature sensor of indoor heat exchanger. Auto fan speed is
changed from normal setting to quiet setting of respective fan speed. This is to reduce sound of Hi, Me,
Lo for 3dB.
o Fan speed manual
 Manual fan speed for quiet operation is -1 step from setting fan speed.
13.8 Powerful Mode Operation
 When the powerful mode is selected, the internal setting temperature will shift lower up to 3.6°F (for Cooling/Soft
Dry) or higher up to 6.3°F (for Heating) than remote control setting temperature for 20 minutes to achieve the
setting temperature quickly.
13.9 Timer Control
13.9.1 ON Timer Control
 ON Timer can be set using remote control, where the unit with timer set will start operation earlier than the setting
time. This is to provide a comfortable environment when reaching the set ON time.
 60 minutes before the set ON time, indoor (at fan speed of Lo-) and outdoor fan motor start operation for 30
seconds to determine the indoor intake air temperature and outdoor air temperature in order to judge the
operation starting time.
 From the above judgment, the decided operation will start operation earlier than the set time as shown below.
13.9.2 OFF Timer Control
 OFF Timer can be set using remote control, the unit with timer set will stop at set time.
In
d
oo
r
int
a
k
e
a
i
r
temperature (
o
F)
Outdoor air
temperature (
o
F)
86
86 95
Cooling/Soft Dry
(
o
F)
10 min
15 min
5min
77
In
d
oo
r
int
a
k
e
a
i
r
temperature (
o
F)
Outdoor air
temperature (
o
F)
59
32 41
Heating
(
o
F)
30 min
25 min
35 min
41