York Millennium YCAS 316, Installation Operation & Maintenance, Page: 76 / 144

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YORK INTERNATIONAL
DISPLAY KEYS
FIG. 21 – “DISPLAY” KEYS
GENERAL
The Display keys allow the user to retrieve system
pressures, system motor currents, chilled liquid
temperatures, saturated temperatures, superheat tem-
peratures, outdoor ambient temperature, compressor
running times, number of compressor starts, and option
information on the chiller package. This data is useful for
monitoring chiller operation, diagnosing potential future
problems, troubleshooting, and commissioning the
chiller.
Displayed data will be real-time data displayed on a “40”
character display consisting of 2 lines of 20 characters.
The display will update about every “2” seconds.
When a Display key is pressed, the corresponding
message will be displayed and will remain on the display
until another key is pressed.
Display Messages may show characters indicating
“greater than” (>) or “less than” (<). These characters
indicate the actual values are greater than or less than the
limit values which are being displayed.
If a message is required to be updated faster than every
2 seconds, the appropriate key for the desired display
may be pushed and held. Updating will be at 0.4 second
intervals.
Each of the keys and an example of the typical
corresponding display messages will be discussed in the
text which follows.
Chilled Liquid Temps
A display indicating chiller leaving and return water
temperature is provided when the key is pressed.
The minimum limit on the display is 9.1°F (-12.7°C). The
maximum limit on the display is 84.2°F (29.0°C).
Ambient Temp
The outdoor ambient temperature is displayed when this
key is pressed.
The minimum limit on the display is -4.6°F (-20.3°C). The
maximum limit on the display is 137.9°F (58.8°C).
AMBIENT
TEMP
28164A
L W T = 4 9 . 2 ° F
R W T = 5 2 . 0 ° F
A M B I E N T A I R
= 7 1 . 9 ° F
DISPLAY
KEYS
CHILLED
LIQUID TEMPS