Safety Stop; Interface Conventions Overview; Display Only; Programmable - York YK Style H Operation Manual

SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
• Remotely through digital inputs in digital or ana-
log remote mode
• By the E-Link Gateway in BAS (ISN) remote
mode
When the control is changed to local mode from any
other source, it will remain in RUN if already running
or remain in STOP if already stopped. A hardware
Safety Stop button is also located on the side of the
panel.

SAFETY STOP

The Red Safety Stop button located on
the control panel cabinet may be pressed
to immediately shut down the chiller if
needed.
When depressed, the chiller will stop immediately and
will not run under any condition. For safety reasons,
this position is required for many maintenance tasks to
be completed.
The Safety Stop button must be rotated clockwise to
release the stop condition. The safety stop is not in-
tended for normal shutdown of the chiller.

INTERFACE CONVENTIONS OVERVIEW

The graphical display on each control panel allows
a wide variety of information to be presented to the
user. Each screen description in this document will
begin with a section entitled OVERVIEW which will
describe the graphical elements on the screen and give
a short summary of the functions available. Each ele-
ment on the screen will then be categorized into three
distinct groups: Display Only, Programmable, and
Navigation. Below is a short description of what types
of information are included in these groups.
The Programmable values and Navigation commands
are also subject to access level restrictions as described
below. For each of these elements, an indication is
given to show the minimum access level required to
program the value or navigate to the subscreen.

DISPLAY ONLY

Values in this group are read-only parameters of in-
formation about the chiller operation. This type of in-
formation may be represented by a numerical value, a
text string, or an LED image. For numerical values, if
the monitored parameter is above the normal operat-
ing range, the high limit value will be displayed along
16
with the '>' symbol; if it is below the normal operating
range, the low limit value will be displayed along with
the '<' symbol. In some cases, the value may be ren-
dered invalid by other conditions and the display will
use X's to indicate this.

PROGRAMMABLE

Values in this group are available for change by the
user. In order to program any setpoints on the system,
the user must first be logged in with the appropriate ac-
cess level. Each of the programmable values requires
a specific access level which will be indicated beside
the specified value. All of the programmable controls
in the system fall into one of the categories described
below:
Access Level
In order to program any setpoints on the system, the
user must first login with an appropriate access level.
When power is applied to the chiller, the system begins
with an access level of VIEW. This will allow the user
to navigate to most screens and observe the values dis-
played there. However, the user will not be allowed to
change any values. To change any values, the user must
return to the HOME Screen (shown by default when
power is applied to the system), and use the LOGIN
button or utilize the CHANGE SETPOINTS key de-
scribed below. At this point, the user will be prompted
to enter a User ID and the corresponding password. By
default, the User ID is zero (0). In order to gain stan-
dard OPERATOR level access, the password would be
entered as 9 6 7 5, using the numeric keypad. OPERA-
TOR access reverts to the VIEW level after 10 continu-
ous minutes without a keypress. If a custom User ID
and password have been defined (refer to User Screen
on Page 133), the user may enter that User ID and the
corresponding password value.
If the correct password is received, the user is autho-
rized with the appropriate access level. If an incorrect
password is entered, the user is notified of the failure
and prompted again. At this point the user may retry
the password entry, or cancel the login attempt.
Change Setpoints
On screens containing setpoints programmable at the
OPERATOR access level, a key with this label will be
visible if the present access level is VIEW. This key
brings up the access level prompt described above. It
allows the user to login at a higher access level without
returning to the HOME Screen. After login, the user
may then modify setpoints on that screen.
FORM 160.76-O2
issue date: 6/15/2015
JOHNsON CONtROLs