York YCWL0056SE, Installation Operation & Maintenance

Page: 123 / 188

SECTION 7 – UNIT CONTROLS
FORM 201.26-NM1
ISSUE DATE: 1/19/2018
JOHNSON CONTROLS
123
7
The DISPLAY/PRINT keys allow the user to retrieve
system and unit information that is useful for monitor-
ing chiller operation, diagnosing potential problems,
troubleshooting, and commissioning the chiller.
System and unit information, unit options, setpoints,
and scheduling can also be printed out with the use of
a printer. Both real-time and history information are
available.
Oper Data Key
The OPER DATA key gives the user access to unit and
system operating parameters. When the OPER DATA
key is pressed, system parameters will be displayed and
remain on the display until another key is pressed. After
pressing the OPER DATA key, the various operating
data screens can be scrolled through by using the ↑ (UP)
and ↓ (DOWN) arrow keys or the ENTER/ADV key
located under the “ENTRY” section.
System 2 information will only be dis-
played for 2 system units.
DISPLAY/PRINT KEYS
With the “UNIT TYPE” set as a liquid chiller (no
jumper to J11-12), the following list of operating data
screens are viewable under the OPER DATA key in the
order that they are displayed. The ↓ (DOWN) arrow
key scrolls through the displays in the order they ap-
pear below:
The chiller MUST be set to be a liquid
chiller (no jumper to J11-12). DO NOT
operate the chiller if not properly set up.
L C H L T = 4 6 . 2 ° F
R C H L T = 5 7 . 4 ° F
°
This display shows chilled leaving and return liquid
temperatures. The minimum limit on the display for
these parameters are 2.2 °F (-19 °C). The maximum
limit on the display is 140 °F (60 °C).
A M B I E N T A I R T E M P
= 8 7 . 5 ° F
This display shows the ambient air temperature. The
minimum limit on the display is 0.4 °F (-17.6 °C). The
maximum limit on the display is 131.2 °F (55.1 °C).