IOM 1274-3 • CENTRIFUGAL WATER CHILLERS 38 www.DaikinApplied.com
Operation
Figure 37: Home View Screen
The Home View Screen (
Figure 37
) shows the basic operating
condition of the chiller. Note that the chiller displayed on all
screens will be representative of the actual chiller, showing
either one or two compressors depending on the chiller model.
Other unit options and order details are not specific to the HMI
image.
(I) Consistent Information
The top banner across all screens
will always show the following:
• Actual leaving water temperature
• Chilled water setpoint
• Date and Time
• Chiller Control Source
• Unit Status - the possible status combinations are shown
in
Table 11
and discussed below.
Table 11: Unit Status Possibilities
MAIN MODE
STATE
SOURCE (for stop)
Cool
Off
Manual/Mechanical Switch
Ice
Shutdown
Remote Switches
Heat
Auto
Local Unit
BAS Network
• Chiller can only be in one of the three main operating
modes at a time; however, the available mode setpoint
may be a combination of COOL, w/ GLYCOL, ICE, and
HEAT. For example, Cool/Ice w/ Glycol is an available
mode setpoint but the chiller can only be in either COOL
or ICE mode at any given time.
“Figure 54: Settings View
- Modes” on page 48
gives more information.
•
Compressor Status, shown for each unit compressor (#1
only for single compressor units, both #1 and #2 for dual
compressor units), is Mode followed by State followed by
the Source device or signal. The possible combinations
are shown in
Table 12
.
Table 12: Compressor Status Possibilities
Complete STATUS Text
(in priority sequence)
Notes
OFF Manual Switch
Reason for the
compressor being off
OFF Compressor Alarm
OFF Unit State
OFF Evap Flow/Re-circulate
OFF Low Oil Sump Temp
OFF Start to Start Timer = xxx
OFF Stop to Start Timer = xxx
OFF Staging (Next ON)
OFF Awaiting Load
PRELUBE Vanes Open
Compressor is in START state - Current state
of the Prelube sequence
PRELUBE Timer=xxx
PRELUBE Condenser Flow
RUN Unload Vanes-Max Amps
Overrides water temperature command
RUN Hold Vanes-Max Amps
RUN Manual Vanes & Speed
Used for service purposes. “T” password re
-
quired. Operated from compressor controller
RUN Load Vanes-Manual Speed
RUN Hold Vanes-Manual Speed
RUN Unload Vanes-Manual Speed
RUN Load Speed-Manual Vanes
RUN Hold Speed-Manual Vanes
RUN Unload Speed-Manual Vanes
RUN Unload Vanes-Lag Start
Overrides water temperature command
RUN Hold Vanes-Evap Press
RUN Unload Vanes-Evap Press
RUN Unload Vanes-Soft Load
RUN Hold Vanes-Soft Load
RUN Load Vanes-Disch Temp
RUN Hold Vanes-Pull-down Rate
RUN Unload Vanes-Demand Limit
RUN Hold Vanes-Min Amps
RUN Load Vanes
Normal operation
RUN Hold Vanes
RUN Unload Vanes
SHUTDOWN Unload
Unloading during the shutdown sequence
POSTLUBE Timer=xxx
Postlube timer on
POSTLUBE Motor Current High
Compressor motor running during the shut-
down mode. It should be off.
