Tank Booster Heater Control; Three Way Valve Control; Sterillization Mode; Quiet Operation - Panasonic WH-UD07CE5-A Service Manual

13.10. Tank Booster Heater Control

13.10.1. Tank booster heater control
Heating operation condition:
1. Booster heater Turn On condition:
• After BOOSTER HEATER DELAY TIMER fulfil during heat pump startup time in tank mode, or during switching from heating
heat-up interval to tank heat-up interval in heat+tank mode (heating priority not set).
• Tank temperature < tank set temperature + [-5°C],
• 20 minutes since previous heater off.
* BOOSTER HEATER DELAY TIMER is clear when tank heat-up interval end.
2. Booster heater Turn Off condition:-
• Tank temperature > tank set temperature + [+2°C] for continuous 15 sec
• When BOOSTER HEATER DELAY TIMER start count after switch from heating heat-up interval to tank heat-up interval
* DELAY TIMER can be set by control panel.

13.11. Three Way Valve Control

• Purpose:
- 3 ways valve is used to change flow direction of hot water from heat pump between heating side and tank side
• Control contents:
1. 3 ways valve switch Off:
• During 3 ways valve switch Off time, the hot water will provide heat capacity to heating side.
2. 3 ways valve switch On:
• During 3 ways valve switch On time, the hot water will provide heat capacity to tank side.
3. Stop condition:
• During stop mode, 3 ways valve will be in switch off position

13.12. Sterillization Mode

1. During Sterillization mode, Tank will be heat up to the Sterillize Set temperature for a certain period of time, also set by
controller.
2. The function can only be set on timer to operate once in a week.
3. It will be cancelled even when the temperature is not reached after 4 hours.
4. When tank mode is OFF or disabled, sterillization is cancelled.

13.13. Quiet Operation

• Purpose:
- To provide quiet operation compare to normal operation by reduces outdoor unit noise.
• Starting condition:
1. When quiet button is presses.
2. When quiet request ON time by weekly timer (Refer to control panel.)
• When any of above mentioned condition is achieved, this control is activated.
New target FM speed = Present target FM speed - 80 rpm
Minimum target FM speed = 200 rpm
• Cancellation condition:
1. Cancel by press quiet button
2. Stop by OFF/ON button
3. When quiet request OFF time by weekly timer
When any of above mentioned condition is achieved, this control is cancelled.
71