Fujitsu AOYG45LAT8 - Page 43

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3. HEAT SINK TEMPERATURE PROTECTION CONTROL
During the compressor in operation,
heat sink temperature thermistor (Built-in IPM) will detect heatsink temperature.
It is controlled in the following protections.
Heat sink protection 1 and 2 operates at the same time, if each conditions are met.
<Start condition>
When the heat sink temperature becomes more than 85°C.
<Operation>
Outdoor unit fan +1 STEP (rise) every 30 seconds.
<Release condition>
When the heat sink temperature becomes lower than 80°C.
and the outdoor fan returns to the normal operation.
Heatsink temperature protection 1
Heatsink temperature protection 2
<Start condition>
When the heat sink temperature becomes more than 90°C.
<Operation>
Compressor speed -10rps every 30 seconds.
If the compressor operates at minimum speed for 120 seconds,
and the release condition isn't met, it will be stopped.
<Release condition>
When the heat sink temperature becomes lower than 85°C, the outdoor fan to the normal operation.
If the compressor was stopped by protection, it will restart after 3 minutes ST.
Heatsink temperature protection 3
<Start condition>
When the heat sink temperature becomes more than 100°C.
<Operation>
Compressor is stopped
<Release condition>
When the heat sink temperature becomes lower than 85°C and after 3 minutes ST,
the compressor restarts.
100°C
90°C
85°C
Outdoor unit fan +1 step every 30 sec.
Comp. stop
Comp. speed -10rps every 120 sec.
Heat sink
temperature
(Fig. 27 : Heat sink temperature control)
80°C
Release protection 1
Release protection 2,3