Carrier 42QHF009DS Service Manual page 54

Forced cooling mode:
The indoor fan will work in low speed (For console, the indoor fan will work in breeze speed), compressor and
outdoor fan open unconditionally, after 30mins, the unit will transfer into forced auto mode. All the protections are
valid during forced cooling mode
When there's one indoor unit running in forced cooling, it is the master forced cooling unit. Other indoor units will
run at forced cooling mode too and they will be the slave forced cooling units. The slave forced cooling units can not
quit forced cooling mode until the master forced cooling unit quit.
The slave forced cooling units will not be controlled by other signals.
Forced auto mode:
The action of forced auto mode is the same as normal auto mode with 24℃ setting temperature.
All the protections are valid during forced auto mode
11.7.7 Timer Function
11.7.7.1 Timing range is 24 hours.
11.7.7.2 Timer on. The machine will turn on automatically when reaching the setting time.
11.7.7.3 Timer off. The machine will turn off automatically when reaching the setting time.
11.7.7.4 Timer on/off. The machine will turn on automatically when reaching the setting "on" time, and then
turn off automatically when reaching the setting "off" time.
11.7.7.5 Timer off/on. The machine will turn off automatically when reaching the setting "off" time, and then
turn on automatically when reaching the setting "on" time.
11.7.7.6 The timer function will not change the AC current operation mode. Suppose AC is off now, it will not
start up firstly after setting the "timer off" function. And when reaching the setting time, the timer LED will be
off and the AC running mode has not been changed.
11.7.7.7 The setting time is relative time.
11.78 Sleep mode
11.7.8.1 The sleep function is available in cooling, heating or auto mode.
11.7.8.2. Operation process in sleep mode is as follow.
After pressing ECONOMIC or SLEEP button on controller, the machine will turn into sleep mode.
When cooling, The set temperature rise 1℃ per hour(be lower than 30℃). Two hours later, the set
temperature will maintain as a constant and the fan speed is kept at low speed.
When heating, The set temperature decrease 1℃ per hour(be higher than 17℃). Two hours later, the set
temperature will maintain as a constant and the fan speed is kept at low speed (Anti-cold function takes
precedence over all).
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