Sharp BU Series - Notes on Operation; When Power Failure Occurs; Preheating Function; Defrosting Function

EN-22
Always clear the snow and avoid
snow or ice buildup to prevent
damages to the AC unit.
• The built-in protective device may prevent
the unit from operating when used out of this
range.
• Condensation may form on the air outlet if the
unit operates continuously in the COOL when
humidity is over 80 percent.
WHEN POWER FAILURE OCCURS
This air conditioner has a memory function to
store settings when a power failure occurs.
After power recovery, the unit will
automatically re-start in the same settings
which were active before the power failure,
except for timer settings.
If the timers were set before a power failure, they
will need to be re-set after power recovery.
PREHEATING FUNCTION
In the HEAT operation, the indoor fan may not
start for two to ve minutes after the unit is
turned on to prevent cold air from blowing out of
the unit.
DEFROSTING FUNCTION
• When ice forms on the heat exchanger in
the outdoor unit during the HEAT operation,
an automatic defrost provides heat for about
5 to 10 minutes to remove the ice. During
defrosting, the inside and outside fans stop
operating.During the defrosting operation, the
operation indicator blinks slowly.
• After defrosting is completed, the unit
automatically resumes operation in the HEAT
mode.
HEATING EFFICIENCY
• The unit employs a heat pump that draws heat
from the outside air and releases it into the
room. The outside air temperature therefore
greatly a󰀨ects the heating e󰀩ciency.
• If the heating e󰀩ciency is reduced due to low
outside temperatures, use an additional heater.
• It takes time to warm up and heat the entire
room because of the forced air circulation
system.
NOTES ON OPERATION
OPERATING TEMPERATURE RANGE
IMPORTANT
• For colder climate, install the outdoor unit in a
location not a󰀨ected by snowfall or ice (slope
of roofs of houses for example). The unit
must be installed at least 10 inches above
the average snow accumulation in your area.
In heating mode, make sure the snow is
always 10 inches below the base of the
outdoor unit. The accumulation of snow
under the unit can a󰀨ect the proper operation
of the unit and damage it. During defrosting
the drain holes in the outdoor unit pan should
always be free and let the water ow thru, if
there is snow blocking the ow of water the
ice will accumulate and damage the unit.
NOTE
• The lowest operating temperature for HEAT
is -17°F(-27°C). If outdoor temperature can
drop below -17°F(-27°C) in your area, we
recommend you to have another heating
source. When outdoor temperature actually
drops below -17°F(-27°C), OPERATION
indicator (green), TIMER indicator (orange), and
WLAN indicator (green) on the unit will blink
continuously. Turn o󰀨 the unit to prevent any
damages, as well as ine󰀩cient performance.
10 inch
(254 mm)
clearance
above snow
buildup at
all times.
INDOOR TEMP. OUTDOOR TEMP.
COOLING
upper
limit
90˚F (32.2˚C) 115˚F (46.1˚C)
lower
limit
70˚F (21.1˚C) 14˚F (-10˚C)
HEATING
upper
limit
81˚F (27.2˚C) 75˚F (23.9˚C)
lower
limit
– -17˚F (-27˚C)