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26.3. Heating mode operation time chart (Heat pump type only)
(*2)
Outdoor unit fan control during heating mode operation
Under conditions when the compressor is on during heating mode operation (except during defrosting and
when the liquid bypass valve is on), the outdoor unit fan is controlled by means of input (CN2) indicating
whether the contact of the heating pressure switch on the outdoor unit circuit board is open or closed
(At the start of heating mode operation, the fan operates at HI speed.)
Outdoor unit fan control during heating mode operation
Under conditions when the compressor is on during heating mode operation (except during defrosting and
when the liquid bypass valve is on), the outdoor unit fan is controlled by means of input (CN2) indicating
whether the contact of the heating pressure switch on the outdoor unit circuit board is open or closed
(At the start of heating mode operation, the fan operates at HI speed.)
26.4. Hot starting
1. When heating mode operation starts
1. Start
Hot start control commences heating mode operation starts.
2. Operation
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“PREHEAT” appears on the remote control display. (Other displays remain unchanged.)
At the indoor unit, the indoor unit fan stops. In addition, during hot starting, the louvre stays at the horizontal
position (angle 0°).
At the indoor unit, the indoor unit fan stops. In addition, during hot starting, the louvre stays at the horizontal
position (angle 0°).
3. Cancelling
After 1 minute has passed since heating mode operation started, or if the compressor has turned on, hot
starting is cancelled when the temperature detected by the indoor unit pipe temperature sensor is 18°C
or higher.
After cancellation, the "PREHEAT" display on the remote control disappears and the louvre operation
returns to the previous setting.
(However, for 2 minutes after cancellation, the indoor unit fan operates at LOW speed, and then returns to
the previous setting.)
starting is cancelled when the temperature detected by the indoor unit pipe temperature sensor is 18°C
or higher.
After cancellation, the "PREHEAT" display on the remote control disappears and the louvre operation
returns to the previous setting.
(However, for 2 minutes after cancellation, the indoor unit fan operates at LOW speed, and then returns to
the previous setting.)
<When hot start operation is cancelled by temperature>
2. When defrosting is complete
1. Start
Hot start control commences when defrosting is complete.
2. Operation
"PREHEAT" appears on the remote control display. (Other displays remain unchanged.)
At the indoor unit, the indoor unit fan stops. In addition, during hot starting, the louvre stays at the horizontal
position (angle 0°).
At the indoor unit, the indoor unit fan stops. In addition, during hot starting, the louvre stays at the horizontal
position (angle 0°).
3. Cancelling
Hot starting is cancelled when the temperature detected by the indoor unit pipe temperature sensor is 18°C
or higher, or after a maximum 1 minute has passed since defrosting was completed.
After cancellation, the "PREHEAT" display on the remote control disappears and the louvre operation
returns to the previous setting.
(However, the indoor unit fan operates at LOW speed for 2 minutes after cancellation, and then returns to
the previous setting.)
or higher, or after a maximum 1 minute has passed since defrosting was completed.
After cancellation, the "PREHEAT" display on the remote control disappears and the louvre operation
returns to the previous setting.
(However, the indoor unit fan operates at LOW speed for 2 minutes after cancellation, and then returns to
the previous setting.)
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< When hot start operation is cancelled by temperature >
26.5. Indoor unit fan control when thermostat is off during heating mode
operation
When the thermostat of the indoor unit turns off during heating mode operation, the indoor unit fan operates for 2 minutes at LOW
and then stops. In addition, 5 minutes after the thermostat of the indoor unit turns off, the indoor unit fan again runs at LOW for 10
seconds, and at 3-minute intervals after that it switches back to LOW operation for 10 seconds.
and then stops. In addition, 5 minutes after the thermostat of the indoor unit turns off, the indoor unit fan again runs at LOW for 10
seconds, and at 3-minute intervals after that it switches back to LOW operation for 10 seconds.
26.6. Excess heat dissipation for indoor unit
The indoor unit fan continues operating for 30 seconds after heating mode operation turns off in order to
dissipate excess heat.
1. When heating mode operation has stopped
dissipate excess heat.
1. When heating mode operation has stopped
(LOW operation for 30 seconds)
2. When operation is set to a mode other than heating by means of the OPERATION MODE switch
3. If operation starts again during the 30 seconds mentioned in (1) above
3. If operation starts again during the 30 seconds mentioned in (1) above
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(The fan operates at LOW speed for the remainder of the 30 seconds in (1), and then hot start commences.)
26.7. Defrost mode operation time chart
1. Start and completion of defrosting
a. Start
During heating mode operation (including automatic heating), after the 45-minute defrosting cycle time has
passed, defrosting starts if the temperature detected by the outdoor unit heat exchanger outlet sensor is
2°C or lower for a continuous 5-minute period.
However, if the outdoor unit fan is stopped, the start of defrosting will be delayed by 5 minutes.
The defrosting cycle is 50 minutes from the start of heating mode operation.
passed, defrosting starts if the temperature detected by the outdoor unit heat exchanger outlet sensor is
2°C or lower for a continuous 5-minute period.
However, if the outdoor unit fan is stopped, the start of defrosting will be delayed by 5 minutes.
The defrosting cycle is 50 minutes from the start of heating mode operation.
b. Completion
Defrosting mode operation stops 12 minutes after it starts, or if the temperature detected by the outdoor
unit heat exchanger outlet sensor is 25°C or higher.
After defrosting is complete, hot starting commences.
unit heat exchanger outlet sensor is 25°C or higher.
After defrosting is complete, hot starting commences.
c. Forced defrosting
If P8 on the outdoor unit circuit board is shorted while the compressor is ‘ON’ during heating mode operation
and the temperature detected by the outdoor unit heat exchanger outlet sensor is 25°C or lower, defrosting
is carried out regardless of the current starting conditions.
and the temperature detected by the outdoor unit heat exchanger outlet sensor is 25°C or lower, defrosting
is carried out regardless of the current starting conditions.
2. Operation
a. During defrosting, the outdoor unit turns on the compressor and turns off the outdoor unit fan and the rever-
sing valve.
b. The indoor unit fan operates at LOW for 30 seconds after defrosting starts. After this, the indoor unit fan turns off until
defrosting is complete.
(During defrosting, the louvre of the indoor unit stays at the horizontal.)
(During defrosting, the louvre of the indoor unit stays at the horizontal.)
26.8. Indoor thermostat characteristic
1. Thermostat characteristic during cooling and heating modes
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