Sharp AE-XM24HR, Service Manual

Page: 18 / 50

3 – 1
CHAPTER 3.
FUNCTION AND OPERATION OF PROTECTIVE PROCEDURES
[1] PROTECTIVE FUNCTIONS AND OPERATIONS
FUNCTION AND OPERATION OF PROTECTIVE PROCEDURES
NO.
1
2
3
4
5
Function Operation
Description
Lowers the operating frequency if
the compressor AC current exceeds
set value( ). Stops the compressor
if the current exceeds at minimum
frequency.
Lowers the operating frequency if
the temperature of the compressor
thermistor (TH1) rises above 108
͠
.
Compressor is stopped if the
thermistor stays above 108
͠ for
2 minutes at minimum frequency.
Compressor is stopped if the
compressor thermistor is above
113
͠
(Or when TH1 shorts)
Lowers the operating frequency if
the temperature of the outdoor heat
exchanger rises above 57
͠
during
cooling. Stops the compressor if the
temperature stays above 57
͠
for
2 minutes at minimum frequency
DC over
current
AC over
current
Compressor
overheat
prevention
control
Compressor
high
temperature
error
Outdoor
heat
exchanger
overheat
prevention
control
Detection time
During
compressor
operation
During
compressor
operation
During
compressor
operation
During
compressor
operation
During
compressor
operation
Restart condition
Automatically
restarts after safety
time(180 seconds)
Automatically
restarts after safety
time (180 seconds)
Automatically
restarts after safety
time (180 seconds)
Automatically
restarts when
thermistor (TH1)
temperature falls
below 99
͠
(approximately
30 minutes)
Automatically
restarts after safety
time (180 seconds)
4 times Yes Yes
4 times
Yes
Yes
No limit No No
4 times
Yes
Yes
No limit
No
No
19.3A
6
7
Compressor ia stopped, if heat
exchanger or outdoor thermistor
shorts.
Close the expansion valve of the
corresponding room, if some
suction thermistor shorts.
Compressor is stopped, if
compressor or heat exchanger or
outdoor thermistor opens.
Close the expansion valve of the
corresponding room, if some
suction thermistor shorts. opens.
Thermistor
short
Thermistor
open
When the room
is activated
turns ON and
the compressor
starts.
When the room
turns ON
and the
compressor
starts.
Operation OFF
Operation OFF
1 time
Yes
Yes
1 time Yes Yes
Compressor is stopped if a current
approximately 50A or more flows
in the power transistor module.
Restarts
time
In
door
Out
door