Pioneer WYB-GMFI SERIES Service Manual page 43

For other models:
8.4.3.5 Evaporator coil temperature protection
----T2> TEH2℃, the compressor running frequency decreases to the lower level and runs for 20s.
When the frequency decreases to F2 and the T2 is still over TEH2℃ for 3 minutes, the compressor
will stop.
----T2<48℃ or T2 stays in 48℃~ TEH2℃ for 6 minutes, the frequency will not be limited by T2.
----T2>60℃, the compressor will stop and restart when T2<48℃.
While TEH2=55℃ for MS9A-9HRDN1-BQ0W, MS9A-24HRDN1-MP0W, MS9A-24HRDN1-MS0W;
TEH2=53℃ for other models.
8.4.4 Auto-mode
This mode can be chosen with remote controller and the setting temperature can be changed between
17~30℃.
In auto mode, the machine will choose cooling, heating or fan-only mode according to ΔT (ΔT =T1-Ts).
ΔT=T1-Ts Running mode
ΔT＞1℃ Cooling
-1<ΔT≤1℃ Fan-only
ΔT≤-1℃ Heating
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