WH-SXC09H3E5, WH-SXC12H6E5, WH-UX09HE5, WH-UX12HE5 - Panasonic Air Conditioner Service Manual (repair manual). Page 118

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118 
Tank side (Tank mode) 
1)  When tank mode select and force heater bit received, turn ON backup heater (INTERNAL) or Booster Heater 
(External) depend on the tank heater selection. 
2)  If tank heater selection is INTERNAL, follow normal thermo judgement to switch 3 ways valve to tank side 
and room side. 
3)  If tank heater selection is EXTERNAL, only turn ON booster heater according to tank thermo. 
 
Tank Heater selection is INTERNAL: 
Backup Heater ON Condition: 
a)  After water pump operate 2 mins AND 
b)  When tank temperature < Tank set temperature - [Remocon Set Tank Re-heat Temp] AND 
c)  20 minutes since previous backup heater OFF AND 
d)  Backup heater enable 
 
Backup Heater OFF Condition: 
a)  Force mode OFF OR 
b)  When tank temperature > Tank set temperature for continuous 15 secs OR 
c) Tank 
Operation 
OFF 
 
Tank Heater selection is EXTERNAL: 
Backup Heater ON Condition: 
a)  Force Heater mode ON AND 
b)  Tank temperature < tank set temperature + [Remocon Set Tank Re-heat Temp] - 1°C,  AND 
c)  20 minutes since previous heater off. 
 
Backup Heater OFF Condition: 
a)  Tank temperature > tank set temperature for continuous 15 sec 
b)  Force mode OFF 
c)  Tank Mode Operation OFF 
 
(During tank interval or tank mode condition, water pump and 3 ways valve will OFF) 
 
 
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