Panasonic CS-E18FKR Operating Instructions Manual page 10

SEASONAL INSPECTION AFTER EXTENDED NON-USE:
• Checking of remote control batteries.
• No obstruction at inlet and outlet vents.
• After 15 minutes of operation, it is normal to have the following temperature difference between inlet and outlet vents:
Cooling: ≥ 8°C
Heating: ≥ 14°C
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