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- Tank interval will end and start heating interval timer, IF
* When this condition happen at tank side before case 1 thermo-off. 3WV switch to room side
compulsory and continue until complete room interval.
1. Tank interval timer finish AND External Room Thermo ON OR
2. Fulfill above Case 1 of thermo off condition.
3 Backup heater control:
o During heating heat up interval.
- Follow normal backup heater control operation.
o During tank heat-up interval.
- Backup 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 DELAY 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 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 way valve opens.
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