WH-SXC09H3E5, WH-SXC12H6E5, WH-UX09HE5, WH-UX12HE5 - Panasonic Air Conditioner Service Manual (repair manual). Page 114

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1)  Tank heater selection: 

External: - Booster Heater use to heat up tank when select external 
Internal: - Backup Heater use to heat up tank when select internal 
* When select External Tank Heater, Heater Delay ON Timer need to set. (range 20 min ~ 3 hrs) 
 

2)  Tank Heater ON/OFF selection by user.  

 
The remote control Tank set Temperature range will change according to the External and Internal Tank Heater use. 
 

External  

40 ~ 75°C 

Internal  

40 ~ 65°C 

 

Heating operation condition: 
 

Tank set temperature +
Tank Re-Heat Temp. + [-1°C]

Tank set temperature +
[0°C]

Heater OFF

Heater ON

 

 

a)  Tank heater Turn On condition: 
-  External Heater select for Tank heater by remote controller. 
-  Tank Heater select ON by user. 
-  Tank mode operation ON ( Tank mode, Heat + Tank, or Cool + Tank ) 
-  After TANK HEATER DELAY TIMER fulfil during heat pump startup time in tank mode, or during switching 

from heating heat-up interval to tank heat-up interval in heat + tank mode 

-  Tank temperature < tank set temperature + [Remote controller Set Tank Re-heat Temp] + [-1°C] 
-  20 minutes since previous heater off. 

 

* TANK HEATER DELAY TIMER is clear when tank heat-up interval end. 

 

b)  Tank heater Turn Off condition:- 
-  Tank temperature > tank set temperature + [0°C] for continuous 15 seconds. 
-  When BOOSTER HEATER DELAY TIMER start count after switch from heating heat-up interval to tank heat-

up interval. 

-  Tank Heater select OFF by user 
-  Tank Mode Operation OFF