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13.1.4 IPM (Power transistor) Prevention Control
Overheating Prevention Control
1 When the IPM temperature rises to 248°F, compressor operation will stop immediately.
2 Compressor operation restarts after three minutes the temperature decreases to 230°F.
DC Peak Current Control
1 When electric current to IPM exceeds set value of 30.0 ± 5.0 A, the compressor will stop operate. Then,
operation will restart after three minutes.
2 If the set value is exceeded again more than 30 seconds after the compressor starts, the operation will
restart after two minutes.
3 If the set value is exceeded again within 30 seconds after the compressor starts, the operation will restart
after one minute. If this condition repeats continuously for seven times, all indoor and outdoor relays will be
cut off.
13.1.5 Compressor Overheating Prevention Control
Instructed frequency for compressor operation will be regulated by compressor top temperature. The changes of
frequency are as below figure.
If compressor temperature exceeds 224.6°F, compressor will be stop, occurs 4 times per 20 minutes, timer LED will
be blinking (“F97” is to be confirmed).
197.6ºF
195.8ºF
194ºF
212ºF
217.4ºF
224.6ºF
Compressor = OFF
Compressor Frequency
Reduce
Compressor Frequency
Maintain
Free
Comp. top temperature
13.2 Protection Control For Cooling & Soft Dry Operation
13.2.1 Outdoor Air Temperature Control
The compressor operating frequency is regulated in accordance to the outdoor air temperature as shown in the
diagram below.
This control will begin 1 minute after the compressor starts.
Compressor frequency will adjust base on Outdoor Air Temperature.
77ºF
71.6ºF
Free
Outdoor Air Temperature
Limited
frequency
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