Carrier ALLEGRO 42HQE009N Service Manual page 20

9.10 Automatic operation mode
9.10.1 The air conditioner automatically selects one of the following operation modes: cooling,
heating or fan only according to the temp. difference between room temp. (TA) and set temp.
(TS).
TA—TS
TA—TS>2℃
-1℃≤TA—TS≤+2℃
TA—TS<-1℃
9.10.2 The indoor fan blows automatically in corresponding selected mode.
9.10.3 The motion of indoor fan's blade should accord with the selected operation mode.
9.10.4 One mode should be carried out for at least 15 minutes once selected. If the compressor
cannot start for 15 minutes, reselect the operation mode according to the room temp. and set
temp., or reselect when the set temp. varies.
9.11 Forced cooling function
9.11.1 Select forced cooling function with the forced cooling button or the switch.
9.11.2 The compressor is unconditionally turned on, after 30 minutes cooling operation whose fan
mode is set as low, the A/C operates at the DRY mode with a set temp. of 24℃.
9.11.3 All protections of remote control cooling are available at forced cooling operation.
9.12 Forced Auto function
Select forced auto function with the forced auto button or the switch.
In forced auto status the A/C operates at remote control mode with a set temp. of 24℃.
9.13 Timer Function
9.14 Economic Running
9.14.1 The economic running function is available at cooling, heating or auto mode.
9.14.1 Cooling:
The set temperature rise 1℃ per hour. Two hours later, the set temperature will maintain as
a constant and the fan speed is kept at low speed.
9.14.2 Heating:
The set temperature decrease 1℃ per hour. Two hours later, the set temperature will
maintain as a constant and the air circulation is kept at low speed (Cold air proof function
takes precedence over all).
9.14.3 Auto:
The economic running function operates in accordance with selected running mode by auto
mode.
9.15 Auto restart function
In case of a sudden power failure, this function automatically sets the unit to previous settings
before the power failure when power returns.
Operation mode
Cooling
Fan-only
Heating (air-only for cooling only type)
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