Carrier QHC Series Service Manual page 33

9.4.8 Refrigerant Leakage Detection
With this new technology, the display area will show "EC" when the outdoor unit detects refrigerant
leakage. This function is only available in cooling mode.
9.4.9 Louver Position Memory Function
When starting the unit again after shutting down, its louver will restore to the angle originally set by the
user, but the precondition is that the angle must be within the allowable range, if it exceeds, it will
memorize the maximum angle of the louver. During operation, if the power fails or the end user shuts
down the unit in the turbo mode, the louver will restore to the default angle.
9.4.10 8℃ Heating(optional)
In heating operation, the preset temperature of the air conditioner can be as lower as 8℃, which keeps
the room temperature steady at 8℃ and prevents household things freezing when the house is
unoccupied for a long time in severe cold weather.
9.4.11 Self clean (optional)
For heat pump models which are provided with this function, after running in cooling or drying mode, if
the user press "Self Clean" button on remote controller, firstly, indoor unit runs in fan only mode for a
while, then low heat operation and finally runs in fan only again. This function can keep the inside of
indoor unit dry and prevent breeding of mold.
9.4.12 Follow me (optional)
1) If the indoor PCB receives the signal which
results from pressing the FOLLOW ME button on remote controller, the buzzer will emit a sound and
this indicates the follow me function is initiated. But when the indoor PCB receives signal which sent
from remote controller every 3 minutes, the buzzer will not respond. When the unit is running with
follow me function, the PCB will control the unit according to the temperature from follow me signal,
and the temperature collection function of room temperature sensor will be shielded, but the error
detective function of room temperature sensor will be still valid.
2) When the follow me function is available,
the PCB will control the unit according to the room temperature from the remote controller and the
setting temperature.
3) The PCB will take action to the mode
change information from remote controller signal, but it will not affected by the setting temperature.
4) When the unit is running with follow me
function, if the PCB doesn't receive any signal from remote controller for 7 minutes or pressing
FOLLOW ME button again, the follow me function will be turned off automatically, and the temperature
will control the unit according to the room temperature detected from its own room temperature sensor
and setting temperature.
9.4.13 Silence operation (optional)
Press the "silence" button on remote controller to initiate SILENCE function. When the Silence function
is activated, the compressor running frequency will keep lower than F2 and the indoor unit will bring
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