York YK M3 M3 G4 operation manual Compressor Switch, Display Messages

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.

22 YORK INTERNATIONAL