Panasonic CU-E18CKR Service Manual page 33

Control Condition
a. Ionizer Only Operation.
1. When air-conditioner unit is at "OFF" condition (standby) and ION
operation button at remote control is pressed.
Fan & ionizer on, ION LED illuminates, but power LED maintain
off. (1 2)
However, fan speed can be adjusted later by customer during this
operation.
Airflow direction (Horizontal Vane) control:
Follow vane direction control at cooling mode.
Horizontal vane can be changed by customer during ion only
operation.
b. Operation Mode + Ionizer Operation.
1. Ionising Operation Start Condition
When air conditioner unit is in "ON" condition (Heat, Cool, Dry,
Fan, Auto mode) and ION operation button at remote control is
pressed. Ionizer on & ION LED illuminates. (3
Power LED also illuminates.
4)