Panasonic WH-MDC05F3E5 Service Manual page 56

12.1.7.2 Cooling Priority NOT SET
1. 3 ways valve control:
 3 ways valve switch to room side during room cooling interval and switch to tank side during tank heat-up
interval. Both modes will switch alternately. Tank mode is the initial running mode of this cool + tank mode.
2. Heat pump operation control:-
a) During room cooling interval

Follow normal cooling operation.
Under Solar Priority Set condition:

Switch to tank heat-up interval and start tank heat-up timer when External Room Thermo OFF AND solar
3WV OFF AND Tank temperature < THERMO ON TEMP (End Room Interval Early) OR

Switch to tank heat-up interval and start counting tank heat-up timer when tank temperature < THERMO
ON TEMP AND solar 3VW OFF.
Under Solar Priority Not Set Condition:

Switch to tank heat-up interval and start counting tank heat-up timer when External Room Thermo OFF
AND Tank temperature < THERMO ON TEMP (End Room Interval Early) OR

Switch to tank heat-up interval and start counting tank heat-up timer when tank temperature < THERMO
ON TEMP.
* THERMO ON TEMP is defined from following tank thermo ON/OFF condition.
b) During tank heat-up interval

Tank water set temperature = tank set temperature or 55°C whichever lower.

Heat Pump Water Outlet set temperature is set to [53°C].

Initial Tank THERMO ON TEMP = heat pump tank target temperature + [-2°C].
Tank Thermo ON/OFF characteristic
THERMO OFF TEMP:
o
1) THERMO OFF TEMP = Tank water set temperature + [0°].
2) Tank temperature > THERMO OFF TEMP for continuous 10 seconds, 3 ways valve is switch to
room side. End Tank heat-up interval and start count cooling interval.
3) Tank temperature > Tank set temperature + [2°] for continuously 10 seconds, 3 ways valve is
switch to room side. End Tank heat-up interval and start count cooling interval.
THERMO ON TEMP:
o
1) THERMO ON TEMP = Tank water set temperature + [-2°C].
2) During cooling interval or external room thermo OFF, always detect tank temperature.
Switch to next tank heat-up interval when tank temperature < THERMO ON TEMP.
Case 2:
Heat pump THERMO OFF TEMP:
o
1) Heat pump THERMO OFF TEMP = [53°C] + [+4°C].
2) Water outlet temperature > Heat pump THERMO OFF TEMP for continuous 3 minutes, heat pump
OFF.
THERMO ON TEMP:
o
1) THERMO ON TEMP = Water inlet when heat pump thermo OFF + [-3°C].
56