Panasonic WH-MHF09G3E8, Service Manual

Page: 48 / 140

48
12.1.3 Tank Mode Operation
Control contents:

3 ways valve direction
o
3 ways valve switch to tank side during Tank Thermo ON condition. Switch 3 ways valve to room side when
tank achieve Tank Thermo OFF temperature and SOLAR turn ON condition.

Heat Pump Thermostat characteristic
o
Water set temperature = Tank set temperature or [60°C] whichever lower.
o
Heat pump Water Outlet set temperature is set to [63°C] at tank mode.

Tank Thermo ON/OFF characteristic
o
THERMO OFF TEMP:
1. THERMO OFF TEMP = Tank water set tempe [0°C].
2. Tank temperature > THERMO OFF TEMP for continuous 10 seconds after heat pump OFF, water pump
OFF or
3. Tank temperature > Tank set tempe [2°C] for continuously 20 seconds.
o
THERMO ON TEMP:
1. THERMO ON TEMP = Tank water set tempe [-8°C].
When detect tank temperature < THERMO ON TEMP, water pump ON for 3 minutes then heat pump ON.
Characteristic of heat pump thermo ON/OFF under Tank Mode condition:

Water Outlet Thermo Condition
o
Heat pump THERMO OFF TEMP:
1. Heat pump THERMO OFF TEMP = 63°C + [+4°C].
2. Water outlet temperature > Heat pump THERMO OFF TEMP for continuous 3 minutes, heat pump OFF.
o
Heat pump THERMO ON TEMP:
1. Heat pump THERMO ON TEMP = Water inlet during thermo OFF time + [-3°C].
2. Heat pump ON back when water outlet temperature < Heat pump THERMO ON TEMP.

Water Inlet Thermo Condition
o
Heat pump THERMO OFF TEMP:
1. Water inlet temperature > 65°C for continuous 60 seconds, heat pump OFF.
o
Heat pump THERMO ON TEMP:
1. Heat pump THERMO ON TEMP = Water inlet temperature < 65°C.

Booster heater control
o
Booster heater turns ON and OFF follow normal operation.
o
Booster heater turns ON condition:
1. During start up time (initialization), Booster heater turns ON after DELAY TIMER.
2. When tank temperature lower than HEATER ON TEMP.
3. 20 minutes from previous heater OFF.
o
Booster heater turns OFF CONDITION:
1. When tank temperature higher than tank set temperature for continuous 15 seconds.

Solar 3-way valve
o
Solar pump operates follow solar operation specification.

2 way valve closes

Other
o
Indoor backup heater cannot be ON during tank mode only.