WH-SXC09H3E5, WH-SXC12H6E5, WH-UX09HE5, WH-UX12HE5 - Panasonic Air Conditioner Service Manual (repair manual). Page 120

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Purpose: 

-  To sterilize water tank by setting the required boiling temperature. 

Remote control setting 

-  Days for sterilization function to start can be select. 
-  Time of selected day to start sterilization function. 
-  Boiling temperature (External heater is 55°C ~ 75°C, Internal heater is 55°C ~ 65°C) 
-  Maximum operation time is 5 minutes to 1 hour. 

Start condition 

-  Tank connection set to “YES” by remote control 
-  Sterilization function selects “YES”. 
-  Sterilization signal received from remote controller by timer. 
-  Tank mode request ON. 

Stop condition 

-  When boiling timer is completed. Boiling timer (Remote control set maximum operation time) start counting 

once tank achieve boiling set temperature OR 

-  After 8 hours of operation since sterilization start. 
-  Tank mode request OFF. 

Control content: 

-  During sterilization function activation time, target tank set temperature will internally change to boiling set 

temperature. 

-  During sterilization activates, heat pump and heater (external or internal) will operate as normal tank mode to 

achieve the boiling set temperature. 

-  Sterilization operation will end when stop condition is fulfill. 
-  After sterilization is complete, tank set temperature will resume to normal operation. 

* Tank temperature may not achieve boiling set temperature if tank heater is select OFF OR external compressor 
switch.