Panasonic CS-XE9CKE, Service Manual

Page: 46 / 110

D. Oxygen Enrich Starting Control
1. Purpose
• • • •
Improve Oxygen supply amount by supplying fresh air to surrounding area of Oxygen enrich membrane during starting
time.
• • • • Masking of vacuum pump starting sound.
• • • •
Prevent vacuum pump starting difficulty at low outdoor temperature.
• • • • Flash out water trapped in connecting tube at low outdoor temperature.
2. Normal operation
Outdoor fan is ON as operation start. Vacuum pump ON after operation start after MOPMPS07 second. At the same time
when fan is ON, 2 way valve is ON for EOBENS01 (EOBENS02) second (2 way valve won’t operate if outdoor air temp
higher than EOBENT01).
<Exceptional condition>
a. Outdoor fan is ON when Oxygen operation start.
b. Outdoor fan is OFF during deice operation when Oxygen operation start.
At condition a ~ b, vacuum pump & 2 way valve ON immediately as Oxygen operation start.
OD air temp., T 2 way valve ON duration (min)
EOBENT01 T 0
EOBENT02 T EOBENT01 EOBENS01
T EOBENT02 EOBENS02
Detail Explanation for Specification
Possibilities of poor start-up of vacuum pump
due to deterioration of bearing grease at low
outdoor temperature.
↓
2 way valve open to reduce load
• • • •
At low outdoor air temp., O
2
supply level fixed at level 3.
• • • • Priority to stopping control.
46
CS-XE9CKE CU-XE9CKE / CS-XE12CKE CU-XE12CKE