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2. Freeze-up prevention, vacuum pump continuous running control
•
•
•
• Avoid freeze-up in tube by vacuum pump continuous running at low outdoor temp.
•
•
•
• Start condition
a. OD temp status 1(a,b)
b. O
b. O
2
supply level
0
•
•
•
• Control content
a. Continuous running disregard of oxygen supply level
•
•
•
• Cancellation condition
−
−
−
− Start condition not fulfilled
•
•
•
• Exceptional condition
During deice & MOPMPS08 after deice, OD temp. status does not update as the OD fan is stop. (Air temp. detection
disable).
disable).
3. Freeze-up prevention, 2 way valve control
•
•
•
• Open valve periodically to prevent freeze-up during low OD air temp.
•
•
•
• Open valve duration change according to air temp. status (1a or 1b).
a. Start condition
Either one of below condition is fulfilled.
i. O
i. O
2
supply leve
0 & OD air temp status shift to 1(a,b).
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