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49 

Heat + Tank Mode (Heating priority set) 
Under Solar Priority Set Condition: 
 

Under Solar Priority Not Set Condition: 
 

50 

Setting 2: When heating priority is not set by control panel: 

  When Solar Priority is set/not set by control panel: 
 

1.  3 ways valve control: 

o

  3 ways valve switch to room side during heating heat-up interval, and switch to tank side during tank 

heat-up interval. Both modes will switch alternatively. Tank mode is the Initial running mode of this heat 
+ tank mode (heating no priority). 

 

2.  Heat pump operation control: 

o

  During heating heat-up interval 

  Follow normal heating operation 

Under solar priority set condition: 


  Switch to tank heat-up interval and start counting 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 3WV OFF. 

Under solar priority not set condition: 


  Switch to tank heat interval and start counting tank heat-up timer when External Room Thermo 

OFF AND Tank < THERMO ON TEMP (End Room Interval) 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 Tank thermo ON/OFF condition below. 

o

  During tank heat-up interval 



  Heat pump tank target temperature = Tank set temperature or [50°C] whichever lower. 



  Heat pump Water Outlet set temperature is set to [53°C] during tank interval. 



  Initial Tank THERMO ON TEMP = heat pump tank target temperature + [-2°C]. 

 
Tank thermo ON/OFF characteristic: 
o

  THERMO OFF TEMP: 

1.  THERMO OFF TEMP = Heat pump tank target temperature + [0°C]. 
2.  Tank temperature > THERMO OFF TEMP for continuous 10 seconds after heat pump off due 

to water thermo, switch 3 ways valve to room side. End Tank heat-up interval and start count 
heating heat-up interval. 

3.  Tank temperature > Tank set temperature + [2°C] for continuous 10 seconds, switch 3 way 

valve to room side. End Tank heat up interval and start count heating up interval. 

 

o

  THERMO ON TEMP: 

1.  THERMO ON TEMP = Heat pump tank target temperature + [-2°C]. 
2.  After heating heat-up interval, always detect tank temperature. Switch to next tank heat-up 

interval when tank temperature < THERMO ON TEMP. 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

51 

Characteristic of heat pump thermo ON/OFF under tank side condition 
Water Outlet Thermo condition 

o

  Heat pump THERMO OFF TEMP: 

1.  Heat pump THERMO OFF TEMP = 53°C + [+4°C] 
2.  Water outlet temperature > Heat pump THERMO OFF TEMP for continuous 90 seconds, heat pump 

OFF but water pump continue ON. 

 

o

  THERMO ON TEMP: 

1.  THERMO ON TEMP = Water inlet temperature, when heat pump thermo OFF + [-3°C]. 

 
Water Inlet Thermo condition 

o

  Heat pump THERMO OFF TEMP: 

1.  Water inlet temperature > [55°C] for continuous 60 seconds, heat pump OFF. 

 

o

  THERMO ON TEMP: 

1.  THERMO ON TEMP = Water inlet temperature < [55°C] 

 
Solar Operation Condition (Only during solar priority is set condition) 

  When solar pump ON, tank heat-up interval end early and 3 ways valve switch to room side. 
 

o

  THERMO IN TEMP: 

1.  THERMO ON TEMP = Heat pump tank target temperature + [-2°C]. 
2.  After heating heat-up interval, always detect tank temperature. Switch to next tank heat-up interval when 

tank temperature < THERMO ON TEMP and solar 3 way valve OFF. 

 

o

  Tank interval will end and start heating interval timer, IF 

1.  Tank interval timer finish AND External Room Thermo ON OR 



  Only when this condition occur at tank side before tank temperature thermo OFF switch to room side 

compulsory and continue until complete room heat-up interval and switch back to tank side. 

2.  Fulfill Tank thermo OFF condition. 

 

3.  Backup heater control: 

o

  During heating heat-up interval. 



  Follow normal back up heater control operation. 

o

  During tank heat-up interval. 



  Back up heater OFF during this interval. 

 

4.  Booster heater control: 

o

  During heating heat up interval. 



  Booster heater ON/OFF according to booster heater operation control. 

o

  During tank heat-up interval. 



  Once switch from heating heat-up interval to tank heat-up interval, turn OFF the booster heater 

and start counting the BOOSTER HEATER DEPLAY TIMER. 



  Booster heater turn ON after BOOSTER HEATER DELAY TIMER fulfill and tank temperature 

lower than tank set temperature. 



  BOOSTER HEATER DELAY TIMER is clear when switch to heating heat-up interval. 

 

5.  Solar 3 way valve 

o

  Solar 3WV operates follow solar operates specification. 

 
* Under solar priority is set condition, when solar 3WV is ON, booster heater turn OFF. 
* Under solar priority is not set condition, solar 3WV only can ON during heating heat-up interval. 

 

6.  2 way valve opens. 

 

52 

Heat + Tank Mode (Heating priority not set)                      Tank set Temp. = 60°C 

3 ways valve

ID Water Pump

Booster Heater

Heat Pump

Interval Timer

Interval Timer

Tank side

Tank side

Room side

Switch to tank side even the heating

 interval timer not yet completed when

 tank temperature drop and tank termo on.

Turn to room heating interval compulsory

 and heat up room for the heating

 interval timer after [xxx] time of short

heating time. After room heating interval

timer, if tank thermo off heat pump will

continue at room side. (Turn to heating

side and run room heating interval

compulsory as well if tank temperature

cannot achieve within tank heat-up interval)