York MILLENNIUM YB Series, Operating & Maintenance

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YORK INTERNATIONAL
35
FORM 160.60-O1
8. Press “ PROGRAM ” key
SYSTEM RUN, PRESS STATUS
9. Press “ VANE SPEED TOGGLE ” key one time, then
press the “ HOLD ” key (This will tell you what you will
manually control)
Example: If you selected these vanes, the display
will show you:
SERVICE KEYS CONTROL = VANE POSITION
10. Hold in (press) the “ VANE SPEED TOGGLE ” key
again to display:
VANES: HOLD; ENGINE: INCR; LEVEL: AUTO
11. Press the “ INCR ” or “ DECR ” key as desired and you
will see the change on the display.
PREROTATION VANES/ENGINE SPEED KEYS
OPEN/INCR – Press and release this key to drive the
prerotation vanes open or increase engine speed. If the
chiller is running, this message is displayed:
SYSTEM RUN – VANES OPENING
If chiller is not running, this message is displayed:
SYS READY TO START – VANES OPENING
The vanes will continue to open until the “ CLOSE/DECR ”,
“ HOLD ”, or “ AUTO ” (if temperature error requires it) keys
are pressed and released.
HOLD – Press and release this key to hold the prerotation
vanes/engine speed at their present position. If chiller is
running, this message is displayed:
SYSTEM RUN – VANES HOLDING
If chiller is not running, this message is displayed:
SYS READY TO START – VANES HOLDING
The vanes will remain stationary until the “OPEN”, “HOLD”
or “AUTO” keys are pressed and released.
AUTO – Press and release this key to put the prerotation
vanes or engine speed under LCWT control as long as
the engine load limit setpoint is not reached, which causes
the engine load limit function to override the LCWT con-
trol. If system is running, this message is displayed:
SYSTEM RUN – AUTO SPEED/AUTO VANES
The actual opening and closing of the vanes is indicated
on the display. When the vanes are opening, this mes-
sage is displayed:
SYSTEM RUN – VANES OPENING
If the vanes are closing, this message is displayed:
SYSTEM RUN – VANES CLOSING
Whenever the Control Center is in “ LOCAL ”, “ REMOTE ”
or “ PROGRAM ” mode, the vane control circuitry is auto-
matically placed in “ AUTO ” mode and the vanes operate
to control the leaving chilled water temperature to the
programmed setpoint.
CLOSE/DECR – Press and release this key to drive the
prerotation vanes closed. If chiller is running, this mes-
sage is displayed:
SYSTEM RUN – VANES CLOSING
If chiller is not running, this message is displayed:
SYS READY TO START – VANES CLOSING
When the vanes are fully closed, this message is dis-
played:
SYS READY TO START – VANES CLOSED
The vanes will continue to close until the “OPEN”, “HOLD”
or “AUTO” keys are pressed.
OPEN/INCR – Press and release this key to increase
the speed of the engine. If the unit is running, this mes-
sage is displayed:
SYSTEM RUN – SPEED SIGNAL INCREASING
When the unit reaches maximum speed, this message
is displayed:
SYSTEM RUN – SPEED SIGNAL MAXIMUM
CLOSE/DECR – Press and release this key to decrease
the speed of the engine. If the unit is running, this mes-
sage is displayed:
SYSTEM RUN – SPEED SIGNAL DECREASING
When the unit reaches minimum speed, this message is
displayed:
SYSTEM RUN – SPEED SIGNAL MINIMUM
If the unit is running and the “HOLD” key is depressed
the speed will stop at this point. Pressing “OPEN/INCR”
or “CLOSE/DECR” will allow the speed to continue on its
way to maximum or minimum speed. The display will
show:
SYSTEM RUN – SPEED SIGNAL HOLD
If the unit is running and the “AUTO” key is depressed
the YORK Micro Panel will look at its inputs and decide
on the operation of the speed. Display will show:
SYSTEM RUN – AUTO SPEED SIGNAL
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