WH-SXC09H3E5, WH-SXC12H6E5, WH-UX09HE5, WH-UX12HE5 — Panasonic Air Conditioner Service Manual (repair manual). Page 127

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127 
Control detail: 
During operation ON at Heat Mode 
-  Boiler signal turns ON when 
a.  Outdoor ambient < Outdoor Ambient Set  AND 
b.  Buffer tank temperature < Target Buffer Tank Temperature + [START_TEMP] for [START_TIMER] 
AND 
c.  Heat pump operate at room side  AND 
d.  Connection of Boiler to Heating Select "YES" From installer menu AND 
e.  Buffer Tank connection select "YES" AND 
f.  Boiler prohibit flag = 0 
-  Boiler signal turns OFF when 
a.  Outdoor ambient > Outdoor Ambient Set + [-2°C] OR 
b.  Buffer Tank temperature > Target Buffer Tank temperature + [STOP_TEMP] for [STOP_TIMER] OR 
c.  Heat pump not at room side. OR 
d.  Boiler prohibit flag = 1 
During operation ON at Tank Mode 
-  Boiler signal turns ON when 
a.  Outdoor ambient < Outdoor Ambient Set AND 
b.  Heat pump operate at tank side for continuous | DELAY_TIMER | AND 
c.  Connection of Boiler to DWH Tank select "YES" from installer menu. AND 
d.  Boiler prohibit flag = 0 
-  Boiler signal turns OFF when 
a.  Outdoor ambient > Outdoor Ambient Set + [2°C] OR 
b.  Heat pump not operates at tank side. OR 
c.  Boiler prohibit flag = 1 
Boiler prohibit flag control 
Purpose:  
-  For product safety. Boiler signal is OFF when water temperature is too high. 
Start condition: 
a. Water 
outlet 
≥ 85°C continues for 5 minutes. 
b. Water 
inlet 
≥ 85°C continues for 5 minutes. 
c. Zone1 
water 
temp 
≥ 75°C continues for 5 minutes. 
d. Zone2 
water 
temp 
≥ 75°C continues for 5 minutes. 
 
Contents: 
  After start condition fulfilled, set boiler prohibit flag = 1 
Cancel condition: 
-  After 30 minutes from start condition fulfilled. 
 
Contents: 
  Set boiler prohibit flag = 0 
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