Specifications

18 YORK INTERNATIONAL
SERVICE KEYS
FIG. 15 - KEYPAD - SERVICE KEYS LOCATION
The “SERVICE” keys are provided for the service
technician’s use when performing routine maintenance
or when troubleshooting the system. The “WARNING
RESET” and “PREROTATION VANES” keys are enabled
in “SERVICE” mode only. The remainder of the Service
keys are enabled in “SERVICE”, “LOCAL” or “REMOTE”
mode.
PREROTATION VANES KEYS
OPEN - Press and release this key to drive the prerotation
vanes open. If the chiller is running,
SYSTEM RUN - VANES OPENING
is displayed. If chiller is not running,
SYS READY TO START – VANES OPENING
is displayed. The vanes will continue to open until the
“CLOSE”, “HOLD”, or “AUTO” (if temperature error re-
quires it) keys are pressed and released. (This function
applies to non-Variable Speed Drive applications only.)
HOLD - Press and release this key to hold the prerotation
vanes in their present position. If chiller is running,
SYSTEM RUN – VANES HOLDING
is displayed. If chiller is not running,
SYS READY TO START – VANES HOLDING
is displayed. The vanes will remain stationary until the
“OPEN”, “HOLD” or “AU TO ” keys are pressed and re-
leased. (This function applies to non-Variable Speed
Drive applications only.)
AUTO - Press and release this key to put the prerotation
vanes under LCWT control as long as the current limit
setpoint is not reached, which causes the current limit
function to override the LCWT control. If system is run-
ning,
SYSTEM RUN – AUTO VANES
is displayed. The actual opening and closing of the vanes
is indicated on the display. When the vanes are opening,
SYSTEM RUN – VANES OPENING
is displayed. If the vanes are closing,
SYSTEM RUN – VANES CLOSING
is displayed. Whenever the Control Center is in “LO-
CAL”, “REMOTE ” or “PROGRAM” mode, the vane con-
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