Panasonic WH-UD05JE5 Service Manual page 136

Conditon 2 : Tank Heater OFF (Internal Tank Heater)

If tank temperature achieve tank thermo OFF, heat pump turn OFF, water pump turn OFF, room heater OFF and
3 ways valve switch to room side.
When tank temperature achieve heat pump ON condition, water pump ON, heat pump ON and room heater turn OFF.
Heat pump OFF condition at Tank Mode
Tank temperature > tank water set temperature continuously for 20 seconds after heat pump thermos OFF
o
due to water thermo. (Heat pump turn OFF but water pump continue ON and room heater turn ON to achieve
tank set temperature) OR
Tank temperature > tank set temperature + [1°C] for continuously 20 seconds. (Heat pump OFF, water pump
o
OFF, room heater OFF and 3 ways valve switch to room side)
Heat pump ON condition at Tank Mode
Tank temperature < tank water set temperature + R/C setting (Tank re-heat temp) (Water pump turn ON OR
o
continue ON, heat pump ON and 3 ways valve switch to tank side or maintain at tank side)
Tank heater control

Internal heater only operates to tank side if Tank heater ON and backup heater is enable.
Internal heater turn ON condition:

Tank temperature < tank set temperature AND

Heat pump thermos OFF AND

20 minutes from previous heater off AND

Internal tank heater selects USE from control panel.
Internal heater turn OFF condition:

Tank temperature > tank set temperature for continuously 15 seconds OR

Heat pump thermo ON OR

Mode change or operation is off by control panel.
14.1.10 Heat + Tank Mode Operation
1 3 ways valve control:
3 ways valve switch to room side during room heat-up interval and switch to tank side during tank heat-
o
up interval. Both modes will switch alternately. Tank mode is the initial running mode of Heat + Tank
mode.
2 Heat pump operation control:
During room heat-up interval
o
 Follow normal heating operation.
Switching to tank side depends to below cases:
Case 1:
[Previous switch from tank interval to room interval due to thermo OFF]
 Switch to tank heat-up interval when Tank temp < Tank thermos ON temp (Room heat-up interval
ends)
Case 2:
[If heating operation at room side is less than 30 minutes and switch to tank side 3 times
consecutively]
 Maintain at room heat-up interval regardless of the tank temperature. Switch to tank heat-up interval
only when (Room Interval Timer is complete OR Room heat pump thermo OFF) AND Tank
temperature < Tank thermo ON temperature.
Case 3:
[Previous switch from tank interval to room interval due to tank interval timer is complete]
 Maintain at room heat-up interval regardless of the tank temperature. Switch to tank heat-up interval
only when (Room Interval Timer is complete OR Room heat pump thermo OFF) AND tank
temperature < Tank thermo ON temperature.
During Tank heat-up interval
o
 Tank interval is the first mode running when heat + tank mode is select.
 Switch to room interval only when tank achieve tank thermo OFF OR tank heat-up interval timer is
complete.
 Heat pump operates according to normal tank mode operation.
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