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a display of chilled liquid temperatures leaving the chiller
(LCHLT) and returning to the chiller (RCHLT) is pro-
vided as follows:
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.
3.3 SYSTEM # DATA KEYS
Pressing one of the System # Data keys a number of
times scrolls through displays of differential oil pressure
(OIL), suction pressure (SP) and discharge pressure
(DP), oil temperature, suction temperature (ST), dis-
charge temperature (DT), saturated suction tempera-
ture, suction superheat, saturated discharge tempera-
ture, discharge superheat and compressor slide valve
position.
Examples of these displays are as follows where # is
the appropriate system number :
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, moni-
toring 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 approxi-
mately every 2 seconds. If updating of one of the mes-
sages is required faster than every 2 seconds, the ap-
propriate 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 is
unlikely to occur unless a problem exists in the measur-
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,
29023A
LCHLT = 6 . 8 ° C
RCHLT = 1 2 . 2 ° C
MCHLT = 6.6 ° C
DISPLAY
KEYS AND
OPTION
SWITCHES
Micropanel
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