York Millennium YK M3 M3 G4 THRU YK S6 S4 J2 - Manual (Page 22)

22 YORK INTERNATIONAL
7. Press PROGRAM key.
8. PROGRAM MODE, SELECT SETPOINT is displayed.
9. Press MODE key.
10. The mode that has been previously selected will be
displayed as follows:
LOCAL MODE SELECTED
– or –
SERVICE MODE SELECTED
– or –
REMOTE MODE SELECTED
11. Press ADVANCE DAY key to scroll to desired mode.
Each time this key is pressed, a different mode is
displayed as above:
12. When the desired mode is displayed, press EN-
TER key.
13. PROGRAM MODE, SELECT SETPOINT is displayed.
14. Press ACCESS CODE key to exit PROGRAM mode
and terminate access to PROGRAM mode.
15. ACCESS TO PROGRAM MODE DISABLED is displayed.
COMPRESSOR SWITCH
(See Fig. 13, page 19.)
This rocker switch is used to locally operate the com-
pressor. It is used to start, run and stop the compres-
sor. Also, it resets the Control Center after a safety
shutdown.
To START* chiller compressor in LOCAL mode:
Move COMPRESSOR switch from STOP/RESET
to START position. Switch will spring-return to RUN
position.
To STOP compressor:
Move switch from RUN to STOP/RESET position.
To RESET Control Center:
Following a safety shutdown, the operator is re-
quired to reset the Control Center prior to restart-
ing the system. Move switch from RUN to STOP/
RESET position.
*NOTE: The operator cannot start the compressor (us-
ing this switch) when the Control Center is in
REMOTE mode.
DISPLAY MESSAGES
The following displayed messages will be automatically
displayed unless the operator is requesting additional
information via the keypad.
SYSTEM RUN - CURRENT LIMIT IN EFFECT
Displayed when the chiller is running, and the motor
current is equal-to or greater-than the operator-pro-
grammed “XXX % FLA” current limit value. When the
motor current reaches 100% of this value, the pre-
rotation vanes are not permitted to open further. If the
current continues to rise to 104% of this value, the
vanes will be driven closed – not fully closed; only far
enough to allow the current to decrease to a value less
than 104% of the operator-programmed “XXX % FLA”
current limit.
For example:
With the operator-programmed “% CURRENT LIMIT”
set at 50% and the FLA of the chiller equal to 200A, the
current limit circuit would perform as follows:
(100%) (50% x FLA) = Vanes inhibited from open-
ing further.
(104%) (50% x FLA) = Vanes driven toward close
position.