Carrier 42QHC009DS Service Manual page 24

normal heating mode.
----T3 rises to be higher than TCDE1℃.
----T3 keeps to be higher than TCDE2℃ for 80
seconds.
----The machine has run for 15 minutes in
defrosting mode.
8.4.3.5 Evaporator coil temperature
protection
T2
TEstop
TEdown
TEH2
Off: Compressor stops.
Decrease: Decrease the running frequency to
the lower level.
Hold: Keep the current frequency.
Resume: No limitation for frequency.
8.4.4 Auto-mode
This mode can be chosen with remote
controller and the setting temperature can be
changed between 17° C~30° C
In auto mode, the machine will choose cooling,
heating or fan-only mode according to ΔT (ΔT
=T1-Ts).
ΔT=T1-Ts
ΔT＞2℃
-2≤ΔT≤2℃
ΔT<-2℃
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
Off
Decrease
Hold
Resume
Running mode
Cooling
Fan-only
Heating
machine will choose running function again.
8.4.5 Drying mode
Indoor fan speed is fixed at breeze and can't be
changed. The louver angle is the same as in
cooling mode.
All protections are active and the same as that
in cooling mode.
8.4.6 Forced operation function
Forced cooling mode:
The compressor and outdoor fan keep running
and the indoor fan runs at low speed. After
running for 30 minutes, AC will turn to auto
mode with 24℃ setting temperature.
Forced auto mode:
The action of forced auto mode is the same as
normal auto
temperature.
When AC receives signals, such as switch on,
switch off, timer on, timer off, mode setting, fan
speed setting, sleeping mode setting, follow me
setting, it will quit the forced operation.
8.4.7 Timer function
8.4.7.1 Timing range is 24 hours.
8.4.7.2 Timer on. The machine will turn on
automatically when reaching the setting time.
8.4.7.3 Timer off. The machine will turn off
automatically when reaching the setting time.
8.4.7.4 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.
8.4.7.5 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.
8.4.7.6 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.
8.4.7.7 The setting time is relative time.
22
mode with 24℃ setting