WH-SXC09H3E5, WH-SXC12H6E5, WH-UX09HE5, WH-UX12HE5 - Panasonic Air Conditioner Service Manual (repair manual). Page 112

112 

1  Normal Heating Mode 

o Heater 

On 

condition: 

a.  Heater switch is ON 
b.  After Heatpump thermo ON for [30] mins 
c.  After water pump operate [9] mins 
d.  Outdoor air temperature < Outdoor set temperature for heater 
e.  When water outlet temperature < Water set temperature + [-4°C] 
f.  [20] minutes since previous Backup heater Off 

*  When heatpump cannot operate due to error happens during normal operation, heater will go into 

force mode automatic 

* Heater need to operate during deice operation 
 

o 

Heater Stop Condition: 

a.  When outdoor set temperature > outdoor set temperature + [+2°C] for continuous 15 secs OR 
b.  When water out temp> water set temperature + [-2°C]  for continuous 15 secs OR 
c.  Heater switch is Off OR 
d.  Heatpump thermo-off or OFF condition 

 

2 Force 

Heater 

Mode 

o Heater 

On 

condition: 

a.  After water pump operate [9] mins 
b.  When water outlet temperature < water set temperature + [-4°C] 
c.  [20] minutes since previous Backup heater Off 

 

o 

Heater Stop condition 

a.  Force mode off OR 
b.  When water outlet temperature > water set temperature + [-2°C] for continuous 15 secs 

 

* Do not operate heater at the following situation 
1  Water outlet temperature sensor, and water inlet sensor abnormal 
2  Flow switch abnormal 
3  Circulation pump stop condition