Electra WNG 50 DCI Service Manual page 70

CONTROL SYSTEM
The actual OFAN speeds in heat mode are defined according to the following table
Freq
0
15
25
35
45
55
65
75
85
95
12.5.5.2 Behavior when there is a failure in OFAN
Whenever OFAN fault occurs the compressor will be stopped immediately, except during
deicing protection, then the OFAN will be enabled to be started for maximum 5 times. This rule
is enabled each time the ODU switches to heat/cool modes.
12.5.5.3 Protection Behavior.
•
When the IDU protection the OFAN will reduce OFSpdReducePrtC and OFSpdReducePrtH
RPM for cool and heat respectively.
•
In cool mode the OFAN will operate according to CTT or HST protection level:
Protection level
SR, D1 or D2
Stop-Compressor
12.5.5.4 OFAN Force On condition
If HST is higher than 70°C or defined as "HST bad", OFAN will remain ON at the last operating
speed for maximum 2 minutes after COMP is OFF.
12.5.5.5 Night mode
Upon receiving night mode, the OFAN will be limited to max NightRPM speed only in Cool. It
will be back to its normal operation when receiving the mode is cleared.
12.5.6 RV State Setting
During heat mode (except during Deicing) RV is ON.
During cool/SB mode RV is OFF.
RV status will be changed only if COMP is OFF for 3 minutes or more.
12-14
Outdoor air temperature (OAT)
-15 -7 0 7
0 0 0 0
850 850 750 750
850 850 750 750
850 850 750 750
850 850 750 750
850 850 750 750
850 850 750 750
850 850 750 750
850 850 750 750
850 850 750 750
OFAN will add 100 RPM to the target speed
continue to operate for maximum 2 minutes at it last speed or until normal level is
achieved.
Revision Y05-02
CONTENT
14 21 24
0 0 0
500 350 300
520 370 320
540 390 340
560 410 360
580 430 380
600 450 400
620 470 420
640 490 440
650 500 450
Action
Service Manual - WNG 50_60_80 DCI