WH-SDC03H3E5-1, WH-SDC05H3E5-1, WH-SDC07H3E5-1, WH-SDC09H3E5-1, WH-UD03HE5-1, WH-UD05HE5-1, WH-UD07HE5-1, WH-UD09HE5-1 - Panasonic Air Conditioner Service Manual Simplified (repair manual). Page 122

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122 
  Parallel Mode 
o  Parallel mode allows heat pump and boiler ON at the same time. Boiler operates as an additional heating 
capacity when low heat pump capacity at low ambient condition. 
 
Control detail: 
During operation ON at Heat mode or Tank mode or Heat + Tank mode 
o  Boiler signal turns ON when: 

  Outdoor ambient < Outdoor Ambient Set AND 

  Boiler prohibit flag = 0 
o  Boiler signal turns OFF when: 

  Outdoor ambient > Outdoor Ambient Set + [2°C] OR 

  Boiler prohibit flag = 1 
 
  Advance Parallel Mode 
o  Advance parallel mode allow heat pump to operate and turn ON boiler only when ambient and temperature 
condition is fulfilled. 
 
Remote control setting value: 
1  Outdoor Ambient Set = (Range : -15°C ~ 15°C) 
2  Selection of boiler connection direction. (Heat only, DHW only, Heat & DHW) 
3  Setting data under Heat Direction 
o  Start Temperature  | START_TEMP | 
o  Start Delay Timer  | START_TIMER | 
o  Stop Temperature  | STOP_TEMP | 
o  Stop Delay Timer  | STOP_TIMER | 
4  Setting data under DHW Direction 
o  Delay Timer  
| DELAY_TIMER | 
 
Control detail: 
During operation ON at Heat Mode 
o  Boiler signal turns ON when 

  Outdoor ambient < Outdoor Ambient Set AND 

  Buffer tank temperature < Target Buffer Tank Temperature + [START_TEMP] for [START_TIMER] AND 

  Heat pump operate at room side AND 

  Connection of Boiler to Heating Select "YES" From installer menu AND 

  Buffer Tank connection select "YES" AND 

  Boiler prohibit flag = 0 
o  Boiler signal turns OFF when 

  Outdoor ambient > Outdoor Ambient Set + [-2°C] OR 

  Buffer Tank temperature > Target Buffer Tank temperature + [STOP_TEMP] for [STOP_TIMER] OR 

  Heat pump not at room side. OR] 

  Boiler prohibit flag = 1 
 
During operation ON at Tank Mode 
o  Boiler signal turns ON when 

  Outdoor ambient < Outdoor Ambient Set AND 

  Heat pump operate at tank side for continuous | DELAY_TIMER | AND 

  Connection of Boiler to DWH Tank select "YES" from installer menu. AND 

  Boiler prohibit flag = 0 
o  Boiler signal turns OFF when 

  Outdoor ambient > Outdoor Ambient Set + [2°C] OR 

  Heat pump not operates at tank side. OR 

  Boiler prohibit flag = 1 
 
Boiler prohibit flag control 
 Purpose: 
o  For product safety. Boiler signal is OFF when water temperature is too high. 
 
 
 
 
 
 
 
 

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