Base Pan Heater Control (Optional); Three Way Valve Control - Panasonic WH-SDF09C3E5 Service Manual

2 Booster heater Turn Off condition:
Tank temperature > tank set temperature + [+2°C] for continuous 15 sec
o
When BOOSTER HEATER DELAY TIMER start count after switch from heating heat-up interval to tank
o
heat-up interval
* DELAY TIMER can be set by control panel.

13.11 Base Pan Heater Control (Optional)

To enable the base pan heater function, pin 3 of SW2 of water system PCB has to be switched from OFF to ON
position.
Base pan heater ON condition:
When outdoor ambient temperature ≤ 3°C AND
o
Deice operation ON
o
Base pan heater will continue ON for 10 minutes after deice operation ends.
Base pan heater OFF condition:
When outdoor ambient temperature > 3°C OR
o
When operation is not heating OR
o
Base pan heater ON timer count completed
o

13.12 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.
o
2 3 ways valve switch On:
During 3 ways valve switch On time, the hot water will provide heat capacity to tank side.
o
3 Stop condition:
During stop mode, 3 ways valve will be in switch off position.
o
Base pan heater (85W)
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