YOKOI KIKAI KOSAKUSHO HOPE CRU-10, Manual

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Operation of the selector valve and main gas solenoid valve at the time of temperature control
To minimize the fall of the crucible temperature when the main air enters the crucible at the time of
temperature control (gas OFF), operate the intake valve alone in reverse to the exhaust valve and the
3-port valve (Set the intake valve OFF [ON] when the exhaust valve and the 3-port valve are ON
[OFF]).
If the selector valve is switched upon the opening of the main gas solenoid valve, as this cause the
“gas-rich” phenomenon, delay the timing of the main gas solenoid valve open by one sec.