Panasonic WH-MDC05J3E5, Service Manual, Page: 132 / 246

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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 Tempe [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 tempe [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
SG ready Control Mode:
o
Using same SG ready from Sub Board input to control boiler ON/OFF output.
* When this SG ready is select for bivalent control, default SG ready function will change to control bivalent
output.
o
Remote controller can set the External Pump ON/OFF like bivalent alternative mode.
Control Content
Indoor will follow the SG ready bit input to control ON/OFF heat pump and boiler
00 : Heat pump OFF, Boiler OFF 10 : Heat pump OFF, Boiler ON
01 : Heat pump ON, Boiler OFF 11 : Heat pump ON, Boiler ON
* External pump will turn ON when the external pump selection is ON when boiler is ON even heat pump is OFF.
Boiler prohibit flag control
Purpose:
o
For product safety. Boiler signal is OFF when water temperature is too high.
Start condition:
o
Water outlet ≥ 85°C continues for 5 minutes.
o
Water inlet ≥ 85°C continues for 5 minutes.
o
Zone1 water temp ≥ 75°C continues for 5 minutes.
o
Zone2 Water temp ≥ 75°C continues for 5 minutes.
Contents:
 After start condition fulfilled, set boiler prohibit flag = 1
Cancel condition:
o
After 30 minutes from start condition fulfilled.
Contents:
 Set boiler prohibit flag = 0