Panasonic WH-SDC09H3E8 Service Manual page 106

Characteristic of heat pump thermos ON/OFF under tank mode condition:
1) Water Outlet Thermo Condition
Heat pump thermos OFF temperature:
-
1. Heat pump thermo OFF temperature = Target Water outlet temperature + (2°C)
2. Water outlet temperature > heat pump thermo OFF temperature for continuously 3 minutes, heat pump OFF
but water pump continue ON.
Heat pump thermo ON temperature:
-
1. Heat pump thermo ON temperature = water inlet during thermo OFF time + [-3°C]
2. When water outlet temperature < heat pump thermo ON temperature, heat pump ON.
2) Water inlet thermo protection condition
Heat pump thermo OFF temperature:
-
1. Water inlet temperature > [57°C/55°C] for continuously 30 seconds, heat pump OFF, water pump continue
ON.
Heat pump thermo ON temperature:
-
1. Heat pump thermos ON temp = water inlet temperature < [57°C/55°C].
Thermo ON/OFF for Heat Pump in Tank Operation:
1) When tank temperature achieve heat pump OFF condition, refer below condition:
Condition 1: When Internal Tank Heater is select and Tank Heater ON
Heat pump will turn OFF, water pump continue ON and room heater will continue ON if tank temperature
-
below tank heater thermo ON condition. 3 ways valve will only switch to room side after tank temperature
reach tank heater thermo OFF condition.
Condition 2: When Tank Heater select OFF OR when External Tank Heater is select and Tank heater ON
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.
2) 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
a) Tank temperature > tank water set temperature continuously for 20 seconds after heat pump thermos OFF
due to water thermo. (Heat pump turn OFF but water pump continue ON and room heater turn ON to achieve
tank set temperature) OR
b) Tank temperature > tank set temperature + [1°C] for continuously 20 seconds. (Heat pump OFF, water pump
OFF, room heater OFF and 3 ways valve switch to room side)
Heat pump ON condition at Tank Mode
a) Tank temperature < tank water set temperature + R/C setting (Tank re-heat temp)
(Water pump turn ON OR continue ON, heat pump ON and 3 ways valve switch to tank side or maintain at
tank side)

Room heater control
Room heater only operates to tank side if the Internal Tank Heater is select, Tank heater ON and room
-
heater is enable.
Room heater turn ON condition:
1) Tank temperature < tank set temperature AND
2) Heat pump thermos OFF AND
3) 20 minutes from previous heater off AND
4) Internal tank heater selects USE from control panel.
Outdoor ambient temperature
< 5°C
>= 5°C
Water inlet temperature
55°C
57°C
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