| 摘要 |
<p>PURPOSE:To keep an optimum storing condition in a perishables storehouse, by providing the storehouse with a controlling means which goes back to the combustion or ventilation operation, on power supply restoration, when power failure happens during ventilation, and another controlling means which goes back to the operations before power failure on power supply restoration, when power failure happens after completion of replacement. CONSTITUTION:In case of power failure during combustion, an internal contact is set in the controlling means 50 so that it completes its operation, when the O2 concentration in chamber 46 reaches a prescribed level, and the contact is set so as to keep this state, even when the power fails. Therefore, when the power supply is restored, the operation comes back to the initial stage of combustion and the air-duct valve 49 is switched to introduce air into the combustion furnace. When power supply fails during ventilation, the internal contact is set so that the operation completes, when the O2 concentration reaches the same level as in the air and the state is maintained as before even when the power fails.</p> |
