York YK-EP B Operation & Maintenance Manual page 23

FORM 160.87-OM1
ISSUE DATE: 8/24/2018
For fields requiring access level of SER-
VICE. Qualified service technicians should
refer to the OptiView Control Center
Service for operation instructions and ex-
planations of all programmable setpoints
and displayed values.
PROGRAMMABLE
Login
Access Level Required: VIEW
The OptiView Panel restricts certain operations based
on password entry by the operator. Three different ac-
cess levels are provided as follows: VIEW: The panel
defaults to the lowest access level which is termed
VIEW. In this mode, the chiller operating values and
setpoints can be observed, but no changes can be made.
OPERATOR: The second access level is termed OP-
ERATOR and will allow the customer to change all
of the setpoints required to operate the chiller system.
The OPERATOR access level reverts to the VIEW
level after 10 continuous minutes without a keypress.
SERVICE: In the event that advanced diagnostics are
necessary, a SERVICE access level has been provided.
Only qualified service personnel utilize this access lev-
el. This level provides advanced control over many of
the chiller functions and allows calibration of many of
the chiller controls. The access levels are listed above
in hierarchical order beginning with the lowest level
and proceeding to the highest level. Users logged in
under higher access levels may perform any actions
permitted by lower access levels.
The OPERATOR access level is accompanied by a
10-minute timeout. After ten (10) successive minutes
without a keypress, the panel will revert to the VIEW
access level. This prevents unauthorized changes to the
chiller if a user was logged in at a higher access level
and failed to logout. Proper procedure requires that
after making necessary setpoint adjustments the user
return to the HOME Screen and logout.
Logout
Access Level Required: OPERATOR
This key is displayed when a user is logged in at any
level other than VIEW. Pressing it will return the ac-
cess level to VIEW.
JOHNSON CONTROLS
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
Print
Access Level Required: VIEW
Use this key to generate a hard-copy report of the
present system status. This provides a snapshot of the
primary operating conditions at the time the key is
pressed. The History page provides enhanced report-
ing capability. (Refer to History Screen on 139.) This
option will not be present if the chiller is presently con-
figured to log any incoming Adaptive Capacity Control
map points. (Refer to the Adaptive Capacity Control
Details Screen on Page 98.)
Clear Fault
Access Level Required: SERVICE
When any safety conditions have been detected and the
chiller has been shutdown, the main status display of
the chiller will continue to display a message indicat-
ing the cause of the shutdown. Using this key, the mes-
sage can be cleared once the Safety condition has been
removed.
Warning Reset
Access Level Required: OPERATOR
Use of this key acknowledges a warning condition and
resets the message display associated with it.
Start/Stop Soft Key
Access Level Required: OPERATOR
This key will initially be displayed as Start and when
pressed, allows the operator to Start the chiller. If the
chiller is in Local mode it will start immediately. If the
chiller is in Remote mode then it will start once the
Start key is pressed and the remote mode calls for a
start. Once started, the soft key changes to Stop and
if pressed, will initiate a Soft Stop. A Soft Stop fully
closes the Pre-Rotation Vanes prior to shutting down
the compressor. This reduces bearing wear by elimi-
nating compressor backspin at shutdown. While the
vanes are closing, "Vanes Closing Before Shutdown"
is displayed on the System Status Line. When the Vane
Motor Switch (VMS) closes, indicating the vanes have
fully closed (or 3.5 minutes have elapsed, whichever
occurs first), the Run signal is removed from the com-
pressor motor starter and a System Coastdown is per-
formed. While the vanes are closing, if a Safety Stop
is initiated with the Safety Stop Switch or any fault
other than Leaving Chilled Liquid Temp – Low Tem-
perature, Remote Stop, Multi-Unit Cycling – Contacts
Open, System Cycling – Contacts Open Or Control
Panel – Schedule occur, it will immediately enter Sys-
tem Coastdown.
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