24
CTV-SVU02A-EN
Reports
Table 5.
Chiller top-level operating modes and corresponding submodes
Top-level mode
Description
Corresponding submodes
Any mode
Chiller is stopped while controller software is being updated by
the service tool.
Software Service Lock
Stopped
Chiller is inhibited from running and requires user action to go
to Auto.
Local Stop
Panic Stop
Diagnostic Shutdown—Manual Reset
Run Inhibit
Unit is inhibited from running by building automation system
(BAS), external control source (Ext), or Auto Reset diagnostic
Start Inhibited by BAS
External Source Inhibit
Diagnostic Shutdown—Auto Reset
Auto
Unit is determining if there is a need to run.
Waiting for Evaporator Water Flow
Waiting for a Need to Cool
Waiting for a Need to Heat
Power Up Delay Inhibit (MIN:SEC)
(a)
Waiting to Start
Unit is waiting for tasks required prior to compressor start to be
completed.
Waiting For Condenser Water Flow
Establishing Oil Pressure
Pre-Lubrication Time (MIN:SEC)
(a)
Restart Time Inhibit (MIN:SEC)
(a)
Low Oil Temperature Inhibit: Oil Temperature/
Inhibit Temperature
Waiting for Starter To Start (MIN:SEC)
(a)
Waiting for Low Oil Differential Pressure
Waiting for IGV Positioning to Complete
Starting Compressor
Unit is starting compressor.
No submode is shown
Running
Compressor is running with no limits in effect.
Hot Water Control
Surge
Base Loaded
Current Control Softloading
Capacity Control Softloading
Running—Limit
Compressor is running with limits in effect.
Current Limit
Phase Unbalance Limit
Condenser Pressure Limit
Evaporator Temperature Limit
Minimum Capacity Limit
Maximum Capacity Limit
High Lift Unloading Limit
Preparing to Shutdown
Unit is closing inlet guide vanes prior to compressor shutdown.
Closing IGV (IGV Position %)
(b)
