Mitsubishi Electric QAHV-N560YA-HPB Data Book page 31

4. System Design
* 3-way valve installation
Please connect 3-way valve on the lower part of the storage tank except when the unit is in operation.
Anti-freezing operation will keep the water in the tank circulated and water storage tanks can become thermally stratified.
MEES19K001
: Anti-freezing operation
Residual running of the pump
: Hot water storage operation
3-way valve
(field supply)
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