Hitachi RCUE40AG2 Service Manual page 104

Troubleshooting
7. The right priority confi guration follows the next table criteria.
7 segments
 
:
Setting for main control PCB (PCB
 
:
Setting for main control PCB (PCB
 
:
Setting for subsidiary control PCB (PCB
Modifi cation of priority confi guration

Check previous table for the correct confi guration
1. Modifi cation of the priority number: "", "", ""
7 segments
x
 
"X" is the priority number of the PCB (0, 1 or 2), according to the above table
:
2. Priority number is changeable only in "U2" position, it means that fi rst it is necessary to set U2 in 7
segments pushing the SW3 and SW4 at the same time in Operation PCB (PCB
7 segments
x
 
"X" is the priority number (0, 1 or 2) that you can select following the next point.
:
3. For modifying "X" value is necessary to push during 1 second SW3 or SW4 of Operation PCB (PCB
depending if you want to increase (DSW3) or decrease (DSW4) the priority number
4. Push at the same time DSW3 and DSW4 for 3 seconds for fi xing at "U1" the corresponding priority
number established before in "U2".
5. Switch OFF the power supply in the Electrical Box (M.I. switch OFF)
6. Switch ON the power supply in the Electrical Box (M.I. switch ON)
7. See on the Operation PCB, in the 7 segments, the right confi guration number according to the table on
point 7. On the contrary repeat again all steps and select the right confi guration number.
8. Restore the initial setting: DWS1, RSW8-3
Confi rm the initial setting for these switches with the Technical Catalogue considering the options included
in the model. The standard setting values are the next:

NOTE:
In case of additional option DSW1 and RSW8 can be different
pag. 102
SMGB0003 rev.0 - 01/2007
) in all CHILLERS up to 240 HP
C
1) in Cooling Only CHILLERS with 4 or 5 cycles.
C
DSW1
2) in Cooling Only CHILLERS with 4 or 5 cycles
C
) during 3 seconds.
A
RSW8
)
A