York YK Style H Operation Manual page 22

SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
Heating Condenser Liquid Temperature –
Return
Displays the temperature of the liquid as it enters the
heating condenser tube bundle. Only appears when the
Heat Recovery is enabled.
For fields requiring access level of SER-
VICE. Service Technicians refer to the
OptiView Control Center - Service Instruc-
tions (Form 160.76-M1) for operation
instructions and explanation of all pro-
grammable 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.
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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 on Page 23.) 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 97.)
Message Clear
Access Level Required: SERVICE
When certain safety or cycling conditions have been
detected and the chiller has been shutdown, the main
status display of the chiller will continue to display a
message indicating the cause of the shutdown. Using
this key, the message can be cleared once the 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.
Soft Stop
Access Level Required: OPERATOR
This key, available only when the compressor is run-
ning, is used to initiate a Soft Shutdown. A Soft Shut-
down fully closes the Pre-rotation Vanes prior to shut-
ting down the compressor. This reduces bearing wear
by eliminating compressor backspin at shut-down.
Pressing this key causes the vanes to be driven to
the fully closed position. While the vanes are clos-
ing, 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 compressor motor
starter and a System Coastdown is performed. While
the vanes are closing, if any fault other than Leaving
Chilled Liquid Temp – Low Temperature, Remote
Stop, Multi-Unit Cycling – Contacts Open, System
Cycling – Contacts Open Or Control Panel – Schedule
occurs, it will immediately enter System Coastdown.
FORM 160.76-O2
issue date: 6/15/2015
JOHNsON CONtROLs