Carrier 38QUA009DS, Service Manual, Page: 85 / 116

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15.4.3.5 Evaporator coil temperature
protection
TEstop
T2
Resume
Off
Decrease
TEdown
TEH2
Hold
Off: Compressor stops.
Decrease: Decrease the running frequency to
the lower level.
Hold: Keep the current frequency.
Resume: No limitation for frequency.
15.4.4 Auto-mode
This mode can be chosen with remote
controller and the setting temperature can be
changed between 17~30
℃
(62.6~86°F).
In auto mode, the machine will choose cooling,
heating or fan-
only mode according to ΔT (ΔT
=T1-Ts).
ΔT=T1-Ts
Running mode
ΔT≥1
℃
(33.8°F) Cooling
-1
℃
(30.2°F)<
ΔT<1
℃
(33.8°F)
Fan-only
ΔT≤-1
℃
(30.2°F) Heating
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.
15.4.5 Drying mode
Drying mode works the same as cooling mode
in low speed.
All protections are active and the same as that
in cooling mode.
15.4.6 Timer function
15.4.6.1 Timing range is 24 hours.
15.4.6.2 Timer on. The machine will turn on
automatically when reaching the setting time.
15.4.6.3 Timer off. The machine will turn off
automatically when reaching the setting time.
15.4.6.4 Timer on/off. The machine will turn on
automatically when reaching the setting “on”
time, and then turn off automatically when
reaching the s
etting “off” time.
15.4.6.5 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.
15.4.6.6 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.
15.4.6.7 The setting time is relative time.
15.4.7 Sleep function mode
15.4.7.1 The sleep function is available in
cooling, heating or auto mode.
15.4.7.2. Operation process in sleep mode is as
follow:
When cooling, the setting temperature rises 1
℃
(33.8°F) (be lower than 30
℃
(86°F)) every one
hour, 2 hours later the setting temperature
stops rising and the indoor fan is fixed at low
speed.
When heating, the setting temperature
decreases 1
℃
(33.8°F) (be higher than 17
℃
(62.6°F)) every one hour, 2 hours later the
setting temperature stops rising and indoor fan
is fixed at low speed. (Anti-cold wind function
has the priority).
15.4.7.3 Operation time in sleep mode is 7
hours. After 7 hours the AC quits this mode and
turns off
15.4.7.4 Timer setting is available.
15.4.8 Auto-Restart function