Auto Mode; Forced Operation Function; Timer Function - Carrier 40MAQ Series Service Manual

AUTO MODE

In the Auto mode, the temperature can be set to values between
62~86F (17~30 ). In this mode, the machine will choose
cooling, heating or fan- only mode according to ΔT.
NOTE: ΔT =T1- Ts, where T1 represents the indoor room
temperature and Ts represents the set temperature.
ΔT=T1- Ts
ΔT＞2F
- 1<ΔT≤2F
ΔT≤- 2F
Indoor fan will run at an automatic fan speed for each running mode.
The louver will also operate depending in relevant mode taking place.
If the machine switches mode between heating and cooling, the
compressor will stop for 15 minutes and then choose a mode
according to ΔT.
If a new set temperature is commanded, the system will choose a
running mode according to ΔT.

FORCED OPERATION FUNCTION

When the machine is off, pressing the manual button will carry the
machine to forced auto mode. Pressing the button once again,
within 5 seconds, the machine will turn into forced cooling mode.
In forced auto, forced cooling or any other operation mode,
pressing the manual button will turn off the machine.
When in this mode, all general protections are available.
Forced cooling mode:
The compressor runs at F2 frequency and indoor fan runs as
breeze.
After running for 30 minutes, the machine will turn to auto mode
with a 75_F (24℃) set temperature.
Forced auto mode:
The action of forced auto mode is the same as normal auto mode
with a 75_F (24_C) set temperature.

TIMER FUNCTION

Timing range is 24 hours.
The timer function will not change the system's current operation
mode.
The setting time is relative time.
Timer on
The machine will turn on automatically when reaching the set time.
Timer off
The machine will turn off automatically when reaching the setting
time.
Timer on/off
The machine will turn on automatically when reaching the set "on"
time, and then turn off automatically when reaching the set "off"
time.
The timer function will not change the AC current operation mode.
Suppose AC is off now, it will not start up first after setting the
"timer off" function. And when reaching the setting time, the timer
LED will turn off and the AC running mode will not change.
SLEEP MODE FUNCTION
Operation time in sleep mode is 7 hours. After 7 hours the system
turns off.
Operation process in sleep mode is as follow:
SLEEP MODE - COOLING
When in cooling mode, the set temperature rises 1.8_F (1_C) (up
to a maximum 86_F (30_C)) every one hour. Two hours later the
set temperature stops rising and indoor fan is fixed at low speed.
Running mode
Cooling
Fan- only
Heating
Set point
1.8 ° F (1 ° C)
1.8 ° F (1 ° C)
1 2
Fig. 34 – Sleep Mode - Heating
When in heating mode, the set temperature decreases 1.8_F (1_C)
(down to a minimum 62_F (17_C)) every one hour. Two hours
later the set temperature stops rising and indoor fan is fixed at low
speed.
NOTE: Anti-cold wind function has the priority.
Set point
1.8 ° F (1 ° C)
1.8 ° F (1 ° C)
1 2
Timer setting is available.
When the user uses timer off function in sleep mode (or sleep
function in timer off mode), if the timing is less than 7 hours, sleep
function will be cancelled when reaching the setting time. If the
timing is more than 7 hours, the machine will not stop until it
reaches the set time in sleep mode.
AUTO-RESTART FUNCTION
The indoor unit is equipped with auto-restart function, which is
carried out through an auto-restart module. In case of a sudden
power failure, the module memorizes the setting conditions present
previous to the power failure. The unit will automatically resume to
the previous operation settings (not including swing function) 3
minutes after the power returns.
If the memorization condition is forced cooling mode, the unit will
run in cooling mode for 30 minutes and turn to auto mode at a
75_F (24_C) set temp.
If unit is off before power off and unit is required to start up now,
the compressor will have 1 minute delay when power on. Other
conditions, the compressor will have 3 minutes delay when restarts.
If the equipment was off before the power went off, and it is
required to start up after this power failure, the compressor will
have a 1 minute delay when powering on. In other conditions, the
compressor will have a 3 minutes delay at re-start.
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Time (hour)
Time (hour)