14
HEATING OPERATION
PREPARATION OF HEATING
• Heat pump type
Heat pump type heating applies the mechanism that draws the heat from the outside air to warm up the room by means of the refrigerant.
• Defrost operation
During heating with a heat pump type air conditioner, frost will be formed on the outdoor unit if the temperature outside the room drops. If left alone, the
heating efficiency decreases. In order to deal with this, the operation is automatically switched to defrost operation to remove the frost. During the period,
the air fl ow of indoor/outdoor unit is stopped and “heating defrost” is displayed.
• Outer air temperature and heating capacity
The heating efficiency of heat pump type air conditioner decreases as the outside temperature becomes lower. If the capacity of air conditioner for heating
is not sufficient, please use other heating device.
• Time required until the room temperature increases
A heat type air conditioner circulates warm air to warm the entire room, so it takes a while to rise up the room temperature. It is recommended to start
operation earlier on a very cold day.
• When room temperature adjusting device operates during heating
If room temperature rises and the room temperature adjusting device is activated, the air fl ow becomes automatically low. When the room temperature
drops, it switched back automatically to the normal operation.
“
(PREPARATION OF HEATING)” is displayed in the remote control display area in the following cases.
For wireless devices, the run/check display lamp on the main body display unit will fl ash green.
Setting temperature and preparation of heating are displayed on the wired remote control.
• At Starting Heating Operation
In order to prevent cool air from blowing out, the air fl ow into the room may be stopped depending on the room temperature at
the start of heating operation. please wait for a while and the operation automatically switches to the normal heating operation.
• At defrost operation (during heating operation)
When frost may easily formed on the outdoor unit, the heating operation automatically is stopped (both indoor/outdoor unit
stop fan operation) for approximately 5 to 10 minutes per hour and defrosting is operated. After the defrosting is complete, the
operation automatically switches back to the normal operation.
CASES WHEN “
(PREPARATION OF HEATING)” IS DISPLAYED
NOTICE
An auto restart function, which is disabled at the factory setting, is applicable to the remote control. Consult your dealer.
What is auto restart
•
When a power failure occurs or the power supply is turned off, the function allows the system to automatically resume operation with the remote control
setting made set before the power failure when the power supply recovers. If the system is stopped before power failure it remains stopped after the power
recover.
•
Note that in the following cases it is needed to set again with the remote control.
1
Timer setting is cancelled. But the sleep timer recovers after power failure recovers. When recovering from a power failure, holiday setting will override
the weekly timer setting. And time setting returns to default. To return to original setting, after time setting, execute “holiday cancel”.
2
Louver stops at the horizontal position.
CAUTION
Make sure to stop the operation before turning off the power supply when the auto restart function is enabled. (If the power supply is turned off while the
system is operating, the indoor unit fan will start immediately when the power supply is turned on. In addition, the outdoor unit starts operating 3 minutes
after the power supply is turned on.)
AUTO RESTART
<WIRED REMOTE CONTROL>
TROUBLE SHOOTING
The phenomena mentioned below is not malfunction.
The indoor-unit fan will not move
for several minutes during cooling
/ dehumidifying operation (in
case of the heat recovery system
KXR).
In order to protect the compressor, the indoor-unit fan may take several minutes to begin moving after
beginning cooling / dehumidifying operation.
Compressor protection control is automatically performed every few hours. Air fl ow may stop during this
time; however, cooling operation will resume shortly.
Slapping sounds are heard.
These sounds are generated when plastic components are expanded or shrunk by the heat and rubbed
with each other.
Hissing sounds are heard when
the operation is stopped or during
defrost operation.
These sounds are generated when the refrigerant valve inside the air conditioning system is activated.
The air conditioner starts
operation automatically as soon
as the power supply is turned on.
In case the automatic restart function is enabled, and when the power supply recovers, the system
restarts the operation automatically as same condition as before power supply is cut.
☞
See below
The setting temperature
cannot be changed (the setting
temperature display fl ashes).
If changing the set temperature is prohibited on the remote control, it is not possible to change the
temperature setting even
ź
or
Ÿ
is pressed.
☞
See page 15
In case of wireless remote
control, the unit does not operate
with the inspection display light
on the indoor unit fl ashing even
though any button on the remote
control is pressed.
In case the system is controlled by the other centralized remote control and it forbids operating the
system from the remote control, it is not possible to operate by the remote control.
Even if the wired remote control
is operated, “central control” light
only fl ashes and doesn’t operate.
Is not “central controlling” or “center” displayed?
If controlled with a separately purchased center console etc., the unit cannot be operated by the remote
control.
TROUBLE SHOOTING
Check the following items before requiring service.
THE UNIT DOES NOT WORK AT ALL
Is the power supply switch
turned off?
Is there a blackout or is the
fuse blown?
Is the leakage breaker
activated?
Dangerous. Immediately turn
off the power supply switch,
and contact your dealer.
Is sunlight or other strong
illumination striking the
receive unit? (wireless unit)
ON
OFF
Is the air filter clogged?
Is the swing louver
horizontal (during
heating)?
If the swing
louver is
horizontal, the
air fl ow may
not reach down
to the fl oor.
Are there any obstacles
blocking the air inlet
and outlet grill?
• Is the direct daylight
coming into the room?
• Are there any
unexpected heat
sources in the
room?
• Are there too many
people in the room?
Is
“
(PREPARATION OF
HEATING)” displayed
in the remote control
display
?
☞
See right
POOR COOLING OR HEATING
POOR COOLING
If, after checking the items above, the air conditioner still does not operate normally or in the next cases, stop operating and contact your dealer.
•
If the fuse and breaker blow frequently.
•
If water drips at cooling/dehumidifying operation.
•
If the operation or operation noise is abnormal.
•
If the check indicator light fl ashes.
The phenomena mentioned below is not malfunction.
NO AIR FLOW AT HEATING
The air conditioning system
sounds as if water is draining
from it.
Sounds of rustling or gurgling may be heard when the operation is started, when the compressor is activated/
deactivated during operation, or when the operation is stopped. These are the sounds of the refrigerant fl owing
through the system.
Sounds of rustling or gurgling
may be heard from a stopped
indoor unit.
These sounds can be heard when the air conditioning system is performing automatic control.
The supply air from the indoor
unit smells bad.
The supply air from the indoor unit may smell bad if the smell of cigarettes, cosmetics and/or furniture has saturated
the air conditioning system.
White vapor is generated
from the indoor unit during
operation.
White vapor may be generated during operation if the system is used in environment where oils and fats are
frequently used, such as in restaurants. In this case, consult the dealer and clean the heat exchanger.
The operation switched to
fan operation during cooling
operation.
The operation may switch to fan operation automatically in order to avoid frost being built up on the surface of the
heat exchanger. The operation will soon return to cooling operation.
The indoor fan does not stop
even when the operation is
stopped in heating mode.
The indoor unit fan may continue operating for 40 seconds in order to remove remaining heat in the indoor unit.
CAUTION
Do not turn off the power supply until the fan stops.
The air conditioning system
cannot start operating again
immediately after stopping.
During the fi rst 3 minutes after stopping operation, it is not possible to perform cooling, dehumidifying or heating
operation even if the ON/OFF button is pressed to indicate “operation.” This is because a circuit for protecting the
compressor is activated (the fan is operating during this period).
No air comes out during
dehumidifying operation.
The air fl ow volume cannot
be changed.
During dehumidifying operation, the fan speed is automatically controlled in low speed/stop cycle in order to avoid
both drastic temperature drop and humidity rise.
The swing louver moves
without any operation.
The swing louver automatically swings twice when the power supply switch is turned on. This is not a trouble. The
louver also moves automatically to the horizontal position when “PREPARATION OF HEATING” is displayed.
The outdoor unit discharges
water or steam during heating
operation.
Water or steam is discharge during defrosting operation which removes frost built up on the surface of the heat
exchanger in the outdoor unit in heating mode.
The outdoor unit fan is not
running even when the
system is in operation.
The fan speed is automatically controlled according to the ambient temperature. It may be stopped in high ambient
temperature in case of heating, and in low ambient temperature in case of coding. Also, the fan is stopped during
defrosting operation.
CAUTION
The fan will suddenly begin to operate even if it is stopped. Do not insert finger and/or stick.
The operation switched to
fan operation during cooling
operation.(in case of FDFW
type)
In case the relative humidity is 73% or higher, the operation may alternate between fan operation and cooling
operation even though the thermostat has not been activated. The objective of this operation mode is to prevent
condensate dew formation and dew dropping from indoor unit air supply port.
The operation mode cannot
be selected (in case of the
heat recovery system KXR).
When operation mode is set to the main and sub indoor unit during the heat recovery system KXR, operation mode
of the sub unit cannot be selected.(In this case, the system conforms to operation mode of the main unit.)
The air flow becomes weak
if the operation mode is
changed during operation
(in case of the heat recovery
system KXR).
When you switch the operation mode from Cool to Heat or from Heat to Cool during operation, the air flow
becomes weak for 3 minutes.
Summary of Contents for FD Series
Page 2: ......
