York MILLENNIUM YK, Operating & Maintenance, Page: 22 / 60

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YORK INTERNATIONAL
OPERATING MODES
OPERATING MODES
The MicroComputer Control Center can be operated
in four different operating modes as follows:
SERVICE – enables all the Service keys except DIS-
PLAY DATA, MANUAL OIL PUMP, and HISTORY
PRINT, which are enabled in all modes. See “Service
Keys”, page 20.
LOCAL – This is the normal operating mode. The com-
pressor can be started and stopped from the Control
Center. Also, the Display and Setpoints parameters
can be displayed.
PROGRAM – Allows the operator to program the Set-
points parameters, and change operating modes.
REMOTE – In this mode, the Control Center will ac-
cept control signals from a remote device (i.e. Energy
Management System) or cycling input. The control sig-
nal inputs are:
1. Remote Start
2. Remote Stop
3. Remote LCWT Setpoint
4. Remove Current Limit Setpoint
NOTE: The compressor can be stopped by the COM-
PRESSOR switch, regardless of the operating
mode. The switch must be in RUN position to
enable REMOTE mode. The operator cannot
locally start the compressor using the COM-
PRESSOR switch when in the REMOTE mode.
To determine which operating mode the Control Cen-
ter is presently in, simply press the MODE key.
• If the Control Center is in LOCAL mode,
LOCAL OPERATING MODE IN EFFECT
is displayed.
• If the Control Center is in REMOTE mode,
REMOTE OPERATING MODE IN EFFECT
is displayed.
• If the Control Center is in SERVICE mode,
SERVICE OPERATING MODE IN EFFECT
is displayed.
To change operating mode, proceed as follows:
1. Press ACCESS CODE key.
2.
ENTER VALID ACCESS CODE _ _ _ _
is displayed.
3. Using Entry keys, enter 9 6 7 5 .
4. As each digit is entered, the characters Y O R K
are displayed.
NOTE: If digits other than 9 6 7 5 are entered, Y O R K
is still displayed.
5. Press ENTER key.
NOTE: If digits other than 9 6 7 5 were entered in
step No. 4,
INVALID ACCESS CODE
is dis-
played when the ENTER key is pressed. If
this occurs, enter the correct access code
(9675) and proceed.
6.
ACCESS TO PROGRAM KEY AUTHORIZED
is displayed.
NOTE: Unless terminated by pressing the AC-
CESS CODE key again, the operator will
have access to the PROGRAM key for 10
minutes. When 10 minutes have elapsed,
access to PROGRAM key will be automati-
cally disabled and the operator must return
to step No. 1 to gain access.
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 ENTER
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.