Carrier 42QZA009DS-1 Service Manual page 39

4-Way valve
Compressor
Indoor fan
Outdoor fan
PMV
8.4.5 Auto-mode
This mode can be chosen by remote controller and the setting temperature can be changed between
17~30℃.
In auto mode, the machine will choose cooling, heating or fan-only mode according to the difference
between T1 and TS.
For all models:
Indoor fan will run at auto fan of the relevant mode.
The louver operates same as in relevant mode.
If the machine switches mode between heating and cooling, the compressor will keep stopping for 15
minutes and then choose mode according to T1-Ts.
If the setting temperature is modified, the machine will choose running function again.
8.4.6 Forced operation function
8.4.6.1 Enter forced operation function:
Press the touch button continually, the AC will run as below sequence:
When the machine is off, pressing the touch button will carry the machine to forced auto mode, after this, if
pressing the button once again, the machine will turn into forced cooling mode.
In forced cooling mode, pressing touch button will turn off the machine.
8.4.6.2 In forced operation mode, all general protections and remote control are available.
8.4.6.3 Operation rules:
no longer than 10min
Cool-F9
10S 30S
480P
T1-TS
T1-TS＞2℃
-2< T1-TS≤2℃
T1-TS≤-2℃
Forced auto→Forced cooling→Off
TimeA
10S
Anti cold wind
PMV running
4 mins with 480P
Running mode
Cooling
Fan-only
Heating
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