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Exceptional condition
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• During vacuum pump delay ON within MOPMPS07 second in the start control
Outdoor air temp. T
EOTteisi
EOBENT04
T
EOBENS04
EOBENT05
T
EOBENT04
EOBENS05
EOBENT06
T
EOBENT05
EOBENS06
T
EOBENT06
EOBENS07
Detail Explaination for Specification
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• In order to blow out water from tube, 2 way valve is open before vacuum pump stop during stop operation. At this condition,
air flow increase 4 ~ 5 times, where indoor O
2
supply sound will increase but not noticeable at normal operation.
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• Freeze-up countermeasure (2 way valve)
In order to blow out residual moisture in tube during stop operation (flow velocity up, low humid air intake). Stop delaying
time change as the amount of dew formed depend on outdoor air temperature.
time change as the amount of dew formed depend on outdoor air temperature.
Date name
Description / Designation
Data
OTfan1
Outdoor fan delay stop time
30s
EOBENS04
Hi OD temp., stop control, pump & valve ON time
0s
EOBENS05
Me OD temp., stop control, pump & valve ON time
150s
EOBENS06
Lo OD temp., stop control, pump & valve ON time
150s
EOBENS07
SLo OD temp., stop control, pump & valve ON time
270s
EOBENT04
Stop control, Outdoor air temp.
10°C
EOBENT05
Stop control, Outdoor air temp.
2°C
EOBENT06
Stop control, Outdoor temp.
-3°C
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• Power relay delay stop time is 5 min during stop operation. Therefore maximum delay stop time is 270s.
F. Oxygen Enrich Freeze-Up Prevention Control
1. Control outline
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• To avoid water in tube from freeze-up during low outdoor temperature.
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• Only vacuum pump restart control of protection control is operating.
48
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