Display Keys & Option Switches; General; Chilled Liquid Temps Key - York YCAS0130 Installation, Operation & Maintenance Manual

Micro Panel Contents
3.1

GENERAL

The Display keys provide direct access to retrieve com-
mon ly required data about the operation of the chiller.
This is particularly useful during commissioning, mon-
i tor ing the operation of the chiller, diagnosing potential
future problems and service troubleshooting.
When a Display key is pressed, the corresponding mes-
sage will be displayed and will remain on the display
until another key is pressed.
Displayed data is in "real-time" and is updated ap-
prox i mate ly every 2 seconds. If updating of one of the
mes sag es is required faster than every 2 seconds, the
ap pro pri ate key for the desired display can be pushed
and held to provide updating every 0.4 seconds.
Display Messages may show characters indicating
"great er than" (>) or "less than" (<). These characters
indicate the actual values are greater than or less than
the values which are being displayed, but are outside
the ability of the micro to give an actual reading. This
144
3. DISPLAY KEYS & OPTION SWITCHES
is unlikely to occur unless a problem exists in the mea-
sur ing sensors or during extreme conditions.
The Display keys and the data available from each is
as follows:
3.2

CHILLED LIQUID TEMPS KEY

When the Chilled Liquid Temperatures key is pressed a
display of chilled liquid temperatures leaving the chill er
(LCHLT) and returning to the chiller (RCHLT) is pro-
vid ed as follows:
L C H L T = 4 4 . 2
R C H L T = 5 4 . 0
If the key is pressed again, the following message will
appear if an optional mixed chilled leaving temp sen sor
is installed for multi unit sequencing. If a sen sor is not
installed, pressing the key will have no effect.
M C H L T = 4 3 . 8
FORM 201.19-NM1 (204)
29023A
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YORK INTERNATIONAL