Sharp AH-X079E Service Manual page 19

2-2 Frequency control
(1) AC current peak control
Model
During cooling
AU-X079E
AU-X099E
AE-X079E
AE-X099E
(2) Control for prevention of indoor heat exchanger overheating
If the temperature of the indoor heat exchanger exceeds the overheating prevention line 1 or 2 during heating, the
operating frequency is lowered by approximately 5 to 10 Hz.
After that, the frequency is lowered by approximately 5Hz once every 60 seconds or 10 Hz once every 120 seconds.
When the temperature of the indoor heat exchanger goes below the overheating prevention line 1, the frequency is
raised by approximately 5 Hz once every 60 seconds, and normal operation is restored.
If the frequency is lowered to 15 Hz without the temperature of the outdoor heat exchanger decreasing and this
condition lasts for 1 minute, the compressor will be stopped.
Operating Frequency
During Normal Operation
During Full Power Operation
Operating Frequency
During Normal Operation
During Full Power Operation
(3) Control for prevention of outdoor heat exchanger overheating
If the temperature of the outdoor heat exchanger exceeds the overheating prevention lone 1 or 2 during cooling, the
operating frequency is lowered by approximately 5 to 15 Hz.
After that, the frequency is lowered by approximately 5 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 15 Hz without the temperature of the outdoor heat exchanger decreasing and this
condition lasts for 1 minute, the compressor will be stopped.
Overheating prevention line 1
Overheating prevention line 1
Overheating prevention line 1
(4) 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.
If the frequency is lowered to 15 Hz without the discharge temperature decreasing and this condition lasts for 1
minute, the compressor will be stopped.
(5) Control for prevention of indoor heat exchanger freezing
If the temperature of the indoor heat exchanger goes below approximately 5°C during cooling, 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.
Set value (Normal)
During heating
5.8A
6.0A
6.3A
5.8A
6.0A
6.5A
Above 92 to
92Hz 88Hz
51˚C 52˚C
54˚C 56˚C
Overheating prevention line 2 (Lower 10Hz)
Above 92 to
92Hz 88Hz
53˚C 54˚C
56˚C 57˚C
56˚C
Lower 5Hz once every 60 seconds
Lower 15Hz once every 120 seconds
58˚C
55˚C
Overheating prevention line 1 (Lower 5Hz)
88 to 83 to 75 to
83Hz 75Hz 50Hz
53˚C 54˚C 53˚C
57˚C 58˚C 56˚C
88 to 83 to 75 to
83Hz 75Hz 50Hz
55˚C 56˚C 55˚C
58˚C 60˚C 58˚C
19
AH-X079E/X099E
AY-X079E/X099E
50 to 43 to Below
43Hz 37Hz 37Hz
52˚C 50˚C 46˚C
55˚C 52˚C 49˚C
50 to 43 to Below
43Hz 37Hz 37Hz
54˚C 52˚C 48˚C
57˚C 54˚C 51˚C