Haier AB122ACERA Service Manual - Page 44

HEAT mode control

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Commercial Air Conditioner Model: AU122AEERA AB122ACERA AC122ACERA AD122ALERA ΔT＞2, the compressor and the outdoor motor will run continuously, indoor motor will run at the set speed, this area is defined as Area A; 0≤ΔT≤2, the compressor and the outdoor motor will always run for 10 minutes and then stop for 6 minutes, indoor motor will be LOW speed, this area is defined as Area B; ΔT＜0, the compressor and the outdoor motor will stop, indoor motor will run at Low speed, this area is defined as Area C. 6.2 After the unit is running in DRY mode, the system will change over among Area A, Area B, and Area C (the conversion temperature difference ±1℃) If the system is in Area A, when ΔT＜1, change to Area B; If the system is in Area C, when ΔT>1, change to Area B; ΔT 1 A A B 3 1 If the system is in Area B, when ΔT>3, change to Area A; B WhenΔT＜－1, change to Area C. －1 C ΔT 6.3 Anti-freezed protection (invalid in compulsory operation, trial running, heating mode) C When the unit has run for over 6 minutes after compressor starts up, if indoor coil temperature Tg

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Δ
T
＞
2, the compressor and the outdoor motor will run continuously, indoor motor will run at the set
speed, this area is defined as Area A;
0
≤Δ
T
≤
2, the compressor and the outdoor motor will always run for 10 minutes and then stop for 6
minutes, indoor motor will be LOW speed, this area is defined as Area B;
Δ
T
＜
0, the compressor and the outdoor motor will stop, indoor motor will run at Low speed, this area
is defined as Area C.
6.2 After the unit is running in DRY mode, the system will
change over among Area A, Area B, and Area C (the
conversion temperature difference
±
1
℃
)
If the system is in Area A, when
Δ
T
＜
1, change to Area B;
If the system is in Area C, when
Δ
T>1, change to Area B;
If the system is in Area B, when
Δ
T>3, change to Area A;
When
Δ
T
＜－
1, change to Area C.
6.3 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.
6.4 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.
6.5 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.
7. HEAT mode control
7.1 4-way valve control: in heating mode, compressor startup----4-way valve being electrified 10
seconds
ahead;
compressor
running----4-way
valve
retains
original
state;
compressor
shutoff----4-way valve being powered off 2 minutes and 50 seconds later (except for defrosting,
4-way valve being electrified 5 seconds ahead, and being powered off 55 seconds later).
7.2 In heating mode, for everytime the compressor startup (thermostat ON), within 6 minutes, the
4-way valve will not be limited by the temperature sensor, but for the set temperature change, shutoff
signal and the protection, the compressor can stop immediately without 6-minute limitation.
7.3
Δ
T
≥
1
compressor running, indoor motor runs at anti-cold air mode;
Δ
T
≤
-1
compressor stops, indoor motor runs at blowing remaining heat mode;
-1<
Δ
T<1
compressor retains original state
7.4 Overheat protection (for the unit with outdoor PCB, the outdoor motor is controlled by outdoor unit,
but the compressor is still controlled by indoor unit, and their temperature points will not be accordant
completely)
In heating mode, compressor has started up and indoor motor has run for over 30 seconds, if
indoor coil temperature Tg>60
℃
, outdoor motor will stop; if Tg<56
℃
, and outdoor motor has stop for
45s, outdoor motor will run again; if Tg>73
℃
, the compressor will stop and indoor motor will run
according to the thermostat state. After the compressor stops for 3 minutes and Tg reduces to 48
℃
,
the unit will resume to heating mode, and the compressor and the outdoor motor will run again.
7.5 Temperature cutoff protection
In heating mode (besides the defrosting), 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
A
B
3
－
1
1
1
B
C
C
A
Δ
T
Δ
T
Commercial Air Conditioner
Model: AU122AEERA AB122ACERA
AC122ACERA AD122ALERA
44