Carrier 38QUA009DS, Service Manual, Page: 86 / 116

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The indoor unit is equipped with auto-restart
function, which is carried out through an
auto-restart module. In case of a sudden power
failure, the module memorizes the setting
conditions before the power failure. The unit will
resume the previous operation setting (not
including sleep function) automatically after 3
minutes when power returns.
15.4.9 Follow me
1) If the indoor PCB receives the signal which
results from pressing the FOLLOW ME button
on remote controller or wired 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.
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.
15.4.10 8
℃
Heating(optional)
In heating operation, the preset temperature of
the air conditioner can be as lower as 8
℃
(46.4°F), which keeps the room temperature
steady at 8
℃
(46.4°F) and prevents household
things freezing when the house is unoccupied
for a long time in severe cold weather.
15.4.11 Drain pump control
Adopt the water-level switch to control the
action of drain pump.
Main action under different condition :( every 5
seconds the system will check the water level
one time)
1. When the A/C operates with cooling
(including auto cooling), dehumidifying, and
forced cooling mode, the pump will start
running immediately and continuously, till stop
cooling.
2. Once the water level increase and up to the
control point, LED will alarm and the drain
pump open and continue checking the water
level. If the water level fall down and LED
disalarmed (drain pump delay close 1 minute)
and operate with the last mode. Otherwise the
entire system stop operating (including the
pump) and LED remain alarming after 3
minutes,