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3. DISPLAY KEYS & OPTION SWITCHES
3.1
GENERAL
The Display keys provide direct access to retrieve com-
monly required data about the operation of the chiller.
This is particularly useful during commissioning, mon-
itoring 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-
proximately every 2 seconds. If updating of one of the
messages is required faster than every 2 seconds, the
appropriate key for the desired display can be pushed
and held to provide updating every 0.4 seconds.
Display Messages may show characters indicating
"greater 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
142
is unlikely to occur unless a problem exists in the mea-
suring 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
chiller (LCHLT) and returning to the chiller (RCHLT)
is provided 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 sensor
is installed for multi unit sequencing. If a sensor is not
installed, pressing the key will have no effect.
M C H L T
=
4 3 . 8
29023A
°
F
°
F
°
F
JOHNSON CONTROLS
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