21
AH-S22DP2
AH-S25DP2
AH-S32DP2
2.
OUTDOOR UNIT
2-1 Frequency control
(1) AC current peak control
(2) Control for prevention of outdoor heat exchanger
overheating. If the temperature of the outdoor heat
exchanger exceeds the overheating prevention line
1 or 2 during cooling, the operating frequency is
lowered by approximately 5 to 15 Hz.
After that, the frequency is lowered by approximately
5Hz once every 60 seconds or approximately 15Hz
once every 120 seconds. When the temperature of
the outdoor heat exchanger goes below the
overheating prevention clear line, the frequency is
raised by approximately 5 Hz once every 60 seconds,
and normal operation is restored. If the frequency is
lowered to minimum frequency without the
temperature of the outdoor heat exchanger
decreasing and this condition lasts for 1 minute, the
compressor will be stopped.
(3) Control for prevention of discharge overheating
If the discharge temperature exceeds approximately
105
°
C during compressor operation, the operating
frequency is lowered by approximately 5 Hz. After
that, the frequency is lowered by approximately 5 Hz
once every 60 seconds. When the discharge
temperature goes below approximately 104
°
C , the
frequency is raised by approximately 5 Hz once
every 60 seconds, and normal operation is restored.
I f t h e f r e q u e n c y i s l o w e r e d t o m i n i m u m
frequencywithout the discharge temperature
decreasing and this condition lasts for 1 minute, the
compressor will be stopped.
(4) Control for prevention of indoor heat exchanger
freezing
If the temperature of the indoor heat exchanger goes
below approximately 5
°
C during cooling(only Full
power operation), the operating frequency is lowered
by approximately 5 Hz. After that, the frequency is
lowered by approximately 5 Hz once every 60
seconds. When the temperature of the indoor heat
exchanger rises above approximately 5
°
C, the
frequency is raised by approximately 5 Hz once
every 60 seconds, and normal operation is restored.
If the temperature of the indoor heat exchanger goes
down to approximately 0
°
C and this condition
continues for 4 minutes, the compressor is stopped.
When the temperature rises above approximately
2˚C, normal operation is restored.
2-2 Overcurrent protection
(1) Compressor lock detection
If the set value 2.7A of AC current is exceeded in 6
seconds when operation begins, operation is stopped.
In this case, the outdoor fan does not stop, and 170
seconds after operation is stopped, another try will
be made. Three retries are allowed. On the fourth
retry, a complete stop request signal is sent to the
indoor unit, and the outdoor unit will remain stopped
until reset is performed. At this time, the 3-minute
delay for control of the outdoor unit will not function;
therefore, do not cancel by removing the plug and
cutting the power.
(2) DC overcurrent detection, AC overcurrent detection
To protect against overcurrent due to sudden changes
in load, the compressor is stopped if the set value
(AU-S32DP2: 47A, AU-S22DP2/S25DP2: 26A) DC
is exceeded in the DC section, or the set value (AU-
S22DP2/S25DP2: 11A, AU-S32DP2: 13A) AC is
exceeded in the AC section. In this case, the outdoor
fan does not stop, and 170 seconds after operation is
stopped, another try will be made. Three retries are
allowed. On the fourth retry, a complete stop request
signal is sent to the indoor unit, and the outdoor unit
will remain stopped until reset is performed. At this
time, the 3-minute delay for control of the outdoor
unit will not function; therefore, do not cancel by
removing the plug and cutting the power.
2-3 Compressor protector control
If the temperature of the compressor chamber
exceeds 114
°
C, the compressor is stopped. In this
case, the outdoor fan does not stop, and when the
compressor chamber temperature decreases to
100
°
C three minutes after operation is stopped,
another try will be made. Three retries are allowed.
On the fourth retry, a complete stop request signal is
sent to the indoor unit, and the outdoor unit will
remain stopped until reset is performed. At this time,
the 3-minute delay for control of the outdoor unit will
not function; therefore, do not cancel by removing
the plug and cutting the power.
2-4 Power transistor module protector
If the temperature of the chips in the power transistor
module exceeds 105
°
C, the compressor is stopped.
In this case, the outdoor fan does not stop, and when
the temperature of the chips in the power transistor
module decreases to 105
°
C and 170 seconds
seconds after operation is stopped, another try will
be made.
Three retries are allowed. On the fourth retry, a
complete stop request signal is sent to the indoor
unit, and the outdoor unit will remain stopped until
reset is performed. At this time, the 3-minute delay
for control of the outdoor unit will not function;
therefore, do not cancel by removing the plug and
cutting the power.
2-5 Serial signals
(1) Serial signals consist of all 96-bit signals.
(2) If the outdoor unit does not receive a serial signal, it
will stop approximately 30 seconds later. Note that
this is true only of normal operation; in test mode, it
does not stop and operation takes place based on
the test mode commands.
56˚C
58˚C
55˚C
Lower 5Hz once every 60 seconds
Lower 15Hz once every 120 seconds
Overheating prevention line 1
Overheating prevention line 2
Clear line
M o d e l
S e t v a l u e
7 . 5 A
6 . 5 A
8 . 5 A
A U - S 2 2 D P 2
A U - S 2 5 D P 2
A U - S 3 2 D P 2
