CTV-SVU01G-EN
29
For Duplex™ chillers, the Chiller Operating Modes screen shows top-level modes and submodes
for the chiller (Table 6, p. 29) and for the circuits (Table 7, p. 30). Each table shows top-level
modes in the left column, a description in the middle column, and the corresponding submodes
in the right column.
Submodes are dependent on the top-level mode. They appear on the Chiller Operating Modes
screen with the following characteristics:
• The newest submode appears at the top of the submode list.
• Submodes disappear when they no longer apply.
• The screen displays up to four submodes.
• If less than four submodes are active, the submode rows that do not apply are blank.
Table 6. Chiller top-level operating modes and corresponding submodes for Duplex chillers
Top-level mode Description Corresponding submodes
Stopped
The chiller is not running either circuit and cannot run without
intervention.
Local Stop
Immediate Stop
Diagnostic Shutdown—Manual Reset
Run Inhibit
The chiller is currently being inhibited from starting (and
running), but may be allowed to start if the inhibiting or
diagnostic condition is cleared.
Ice Building Is Complete
Start Inhibited By BAS
Waiting for BAS Communication
External Source Inhibit
Diagnostic Shutdown—Auto Reset
No Circuits Available
Auto
The chiller is not currently running but can be expected to start
at any moment given that the proper conditions and interlocks
are satisfied.
Waiting for Evaporator Water Flow
Waiting for a Need to Cool
Waiting for a Need to Heat
Power Up Display Inhibit (MIN:SEC)
(a)
Waiting to Start
The chiller is going through the necessary steps to allow the
lead circuit to start.
The chiller will wait up to 4 minutes and 15
seconds in this mode for condenser water flow
to be established by means of the flow switch
hardwired input.
Running At least one circuit on the chiller is currently running.
Hot Water Control
Base Loaded
Ice Building
Ice To Normal Transition (MIN:SEC)
(a)
Current Control Softloading
Capacity Control Softloading
Minimum Capacity Limit
Running—Limit
At least one circuit on the chiller is currently running, but the
operation of the chiller as a whole is being actively limited by
the controls. The submodes that apply the Running top modes
may be displayed along with the following limit-specific modes.
All of the chiller-level Running submodes apply.
There are no specific submodes associated with
Running—Limit.
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