Haier AD182ALERA, Service Manual, Page: 28 / 48

conditions, then perform the selected mode.
Tr
≥
Ts-3
℃
select COOL mode (includes FAN mode)
Tr ＜ Ts-3 ℃ select HEAT or FAN mode
4.2 After entering the AUTO mode, the mode
can change over among COOL, HEAT or FAN
modes according to the indoor ambient
temperature (conversion temperature difference
is
±
3
℃
).
4.3 If the unit is in COOL mode, when it
arrives compressor-stop temperature, the
compressor will stop; after compressor stops for
15 minutes, the unit will check the room
temperature, if Tr
＜
Ts-3
℃
, the unit will enter
HEAT or FAN mode, or the unit will still be in
COOL mode;
4.4 For the heat pump unit, if the unit is in HEAT mode at present, when it arrives
compressor-stop temperature, the compressor will stop; after the compressor stops for 15 minutes,
the unit will check the room temperature, if Tr
＞ Ts+3 ℃ , the unit will enter COOL mode, or it will still
be in HEAT mode.
4.5 For cooling only unit, if the unit is at FAN mode, if Tr
＞
Ts+3
℃
, the unit will enter COOL mode.
4.6 When the unit is in HEAT mode, if indoor heat exchanger temperature rises up to over 63
℃
,
the unit will change into COOL mode. And within 1 hour, the heat exchanger temperature will not be
limited, the heating operation will stop temporarily. 1 hour later, the unit will select the proper mode
due to the above condition.
5. COOL mode control
5.1 4-way valve being powered off, compressor run/stop will depends on the temperature difference
between the room temperature and the set temperature.
5.2 In cooling mode, every time the compressor starts up, within 6 minutes, the compressor will not
be limited by the temperature sensor, but the set temperature change, shutoff signal and protection
action will not be limited by 6-minute protection, and the compressor can stop immediately.
5.3
Δ T ≥ 1 compressor will run;
Δ
T
≤
-1 compressor will stop;
-1<
Δ
T<1 compressor will stay in original state
5.4 Anti-freezed protection (invalid in compulsory operation,
trial running, heating mode)
When the unit has run for over 6 minutes after compressor
starts up, if indoor coil temperature Tg<1
℃
, the compressor
and the outdoor motor will stop, and the unit will change to
FAN mode; 9 minutes later after compressor stops and when indoor coil temperature rises to 10
℃ ,
the unit will resume to COOL mode, the compressor and the outdoor motor will run again.
5.5 Outdoor fan control: (realized by outdoor when with outdoor conmmunication function)
if the temp. of indoor coil sensor Tg<6
℃
, control the outdoor fan by the temp. of outdoor coil
sensor;
if the temp. of outdoor defrost sensor Tc<34
℃
, the outdoor fan will be OFF and lasted 45s at least;
if the temp. of outdoor defrost sensor Tc
＞
44
℃
, the outdoor fan will be ON;
if the temp. of outdoor defrost sensor 34 ℃≤ Tc ≤ 44 ℃ , the outdoor fan will remain in the original
state.
5.6 Temperature cutoff protection
In cooling mode, the unit will check indoor coil temperature every time the compressor has run for 1
minutes, when indoor coil temperature Tg>Tr
＋
5, the unit will stop and 3 minutes later restart up; if
the temperature cutoff occurs for 3 times continuously, the unit will stop and alarm.
6. DRY mode control
6.1 When the uint enters DRY mode for the first time, the compressor, outdoor motor and indoor
motor will perform according to the below conditions:
Δ
T
＞
2, the compressor and the outdoor motor will run continuously, indoor motor will run at the set
Ts+3
℃
Ts-3
℃
cooling
heating/blowing
cooling
Te
m
p.
rising
Te
m
p.
falling
heating/blowing
run
stop
1
－
1
run
stop
Δ T
Δ T
Model: AD182ALERA AD362AHERA
Commercial Air Conditioner
28