Pioneer LISAS-B-1403 Service Manual page 13

2.4 External air duct design
 Reserve external air duct, more flexible for the air supply.
2.5 Built-in draining pump
Due to the improvement of structure, more convenient to repair or replace the draining pump.
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 Built-in draining pump to make sure condensed water drain out reliably.
Indoor Units
Features (24K,36K)
Draining Pump
11