Auto-Mode; Drying Mode; Sleep Function - Carrier 42QFD048D8S Service Manual

• T3 maintained above TCDE2 for 80 seconds.
• Unit runs for 15 minutes consecutively in defrosting
mode.
• If T4 is lower than or equal to -22°C and compressor
running time is more than TIMING_DEFROST_TIME,
if any one of the following conditions is satisfied,
defrosting ends and the machine switches to normal
heating mode:
• Unit runs for 10 minutes consecutively in defrosting
mode.
• T3 rises above 10°C.
For some models,
• T3 is lower than 3°C and compressor running time
is more than 120 minutes, at this time, if T3 is lower
than TCDI1+4°C(39.2°F) for 3 minutes. If any one of
the following conditions is satisfied, defrosting ends
and the machine switches to normal heating mode:
• T3 rises above TCDE1+4°C.
• T3 maintained above TCDE2+4°C for 80 seconds.
• Unit runs for 15 minutes consecutively in defrosting
mode.
3.5.5 Evaporator Temperature Protection
When the evaporator temperature exceeds a preset
protection value, the compressor ceases operation.
3.6

Auto-mode

• This mode can be selected with the remote controller
and the setting temperature can be changed between
16°C~30°C.
Case 1:
• In auto mode, the machine selects cooling, heating, or
fan-only mode on the basis of ∆T (∆T =T1-TS).
∆T
∆T>A
B℃≤∆T≤A
∆T<B
Heating*: In auto mode, cooling only models run the fan
• Indoor fan will run at auto fan speed.
• The louver operates same as in relevant mode.
• If the machine switches mode between heating and
cooling, the compressor will keep stopping for certain
time and then choose mode according to ∆T.
Case 2:
• In auto mode, the machine selects cooling, heating, or
fan-only mode on the basis of T1,Ts and T4.
Running mode
Cooling
Fan-only
Heating*
 Product Features
T1
Cooling
Ts+7
Ts+2
Fan
Heating
Ts-3
Heating
13
• If the setting temperature is modified, the machine
selects a new running function.
3.7

Drying mode

• AC operates the same as auto fan in cooling mode.
• When T1<17°C, the fan speed is lower than 30%, the
unit will operate at 30%.
• Low Room Temperature Protection
• If the room temperature is lower than 10°C, the
compressor ceases operations and does not resume
until room temperature exceeds 12°C.
• All protections are active and the same as that in
cooling mode.
3.8

Sleep function

• The sleep function is available in cooling, heating, or
auto mode.
• The operational process for sleep mode is as follows:
• When cooling, the temperature rises 1°C(2°F) (to
not higher than 30°C(86°F)) every hour. After 2
hours, the temperature stops rising and the indoor
fan is fixed at low speed.
• When heating, the temperature decreases 1°C(2°F)
(to not lower than 16°C(60.8°F)) every hour. After
2 hours, the temperature stops decreasing and the
indoor fan is fixed at low speed. Anti-cold wind
function takes priority.
• The unit exits sleep operation when it receives the
following signals:
• Switch off
• Turbo
• Silence
• Self-clean
• Changes in:
• mode
• fan speed
6 
Cooling
Cooling
Fan
22 26
T4