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Case 2:
• Heat pump THERMO OFF TEMP:
1. Heat pump THERMO OFF TEMP = 55°C + [+2°C].
2. Water outlet temperature > Heat pump THERMO OFF TEMP for continuous 90 seconds, switch 3 ways valve to room
side. End Tank heat-up interval and start count heating heat-up interval.
• THERMO ON TEMP:
1. THERMO ON TEMP = Tank temp. when heatpump thermo off + [-3°C].
2. After Heating heat-up interval, always detect tank temperature. Switch to next tank heat-up interval when tank
temperature < THERMO ON TEMP.
Case 3:
• Heat pump THERMO OFF TEMP:
1. Water inlet temperature > X_INLETDT_1°C for continuous X_INLETDT_2 sec, switch 3 ways valve to room side. End
tank heat-up interval and start count heating heat-up interval.
• THERMO ON TEMP:
1. THERMO ON TEMP = Tank temp. when heatpump thermo off + [-3°C].
2. After Heating heat-up interval, always detect tank temperature. Switch to next tank heat-up interval when tank
temperature < THERMO ON TEMP.
Case 4: (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.
• THERMO ON TEMP:
1. THERMO ON TEMP = Heat pump tank target temperature + [-3°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.
3. Backup heater control:
a. During heating heat up interval
• Follow normal backup heater control operation
b. During tank heat-up interval
• Backup heater OFF during this interval
4. Booster heater control:
a. During heating heat-up interval.
• Booster heater ON/OFF according to booster heater operation control
b. 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 DELAY TIMER.
• Booster heater turn ON after BOOSTER HEATER DELAY TIMER fufil 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
• Solar 3WV operates follow solar operation 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 ways valve control:
• 2 ways valve opens.
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