Carrier 42QZA009DS-1 Service Manual page 35

----When system starts up, the louver will be active immediately, and the indoor fan will open after certain
time.
----If the system runs in heating mode, the anti-cold wind function has priority.
8.3.4 Fan speed is out of control (For the units used DC fan motor)
For console:
When indoor fan speed keeps too low (300RPM) for certain time, the unit will stop and the LED will display
the failure.
For other models:
When indoor fan speed keeps too low (lower than 300 RPM) for 50s, the indoor fan will shut off and restart
30s later, if protection happened 3 times when fan motor restart continuously, the unit will stop and the LED
will display the failure.
8.3.5 Inverter module protection
The Inverter module has a protection function about current, voltage and temperature. If these protections
happen, the corresponding code will display on indoor unit and the unit will stop working.
8.4 Operation Modes and Functions
8.4.1 Fan-only mode
(1) Outdoor fan and compressor stop.
(2) For Console: Indoor fan can be set to high/med/low/breeze, for other models: Indoor fan can be set to
high/med/low/auto.
(3) The louver operates same as in cooling mode.
(4) Auto fan in fan-only mode acts as follow:
For all models:
8.4.2 Cooling mode
8.4.2.1 Outdoor fan running rules
T1-24
a
b
c
d
e
H
(H-L)*0.75+L
(H-L)*0.5+L
(H-L)*0.25+L
L
32