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FORM 160.87-OM1
ISSUE DATE: 8/24/2018
The Status Bar of the display contains a Status Line
and, beneath it a Details Line. The Status Line contains
a message describing the operating state of the chill-
er; whether it is stopped, running, starting or shutting
down. The Details Line displays Warning, Cycling,
Safety, Start Inhibit and other messages that provide
further details of the Status Bar messages. The Status
Messages listed below are displayed on the Status Line.
All other messages are displayed on the Details Line.
To aid in the meaning of the message, messages are
displayed in different colors as follows:
MESSAGE
Normal Operation
Warning
Cycling Shutdown
Safety Shutdown
For messages specific to the Variable Speed Drive,
Medium Voltage Variable Speed Drive, Solid State
Starter and Medium Voltage Solid State Starter, refer
to the applicable service manual as follows: Variable
Speed Drive – Service Instructions (Form 160.00-M4);
Medium Voltage Variable Speed Drive – Service (Form
160.00-M6); Solid State Starter (Mod "B") – Opera-
tion and Maintenance (Form 160.00-O2); Medium
Voltage Solid State Starter – Service (Form 160.00-
M5).
STATUS MESSAGES
System Ready To Start
The chiller is shut down but will start upon receipt of a
local or remote start signal.
Cycling Shutdown – Auto Restart
The chiller is shut down on a cycling shutdown. The
cause of the shutdown is still in effect and is displayed
on the Details Line of the Status Bar. The chiller will
automatically restart when the cycling condition clears.
Safety Shutdown – Manual Restart
The chiller is shut down on a safety shutdown. The
cause of the shutdown is still in effect and is displayed
on the Details Line of the Status Bar. The chiller can be
started after the safety condition clears and the Opera-
tor presses the WARNING RESET button.
JOHNSON CONTROLS
SECTION 3 - DISPLAY MESSAGES
COLOR
Green
Yellow
Orange
Red
System Prelube
A chiller start has been initiated and the pre-start lu-
brication is being performed. The prelube duration is
either 50 seconds or 180 seconds, as configured with
a Microboard Program Switch. The prelube duration
must never be changed by anyone other than a quali-
fied Service Technician. The standard prelube duration
is 50 seconds.
System Run
The chiller is running under the condition described in
the Details Line of the Status Bar.
System Run – Cooling Mode
The chiller is running with Heat Pump Duty enabled
and the Heat Pump Duty Operational mode setpoint set
to Cooling mode. In this mode, the Heat Pump is con-
trolling the Leaving Chilled Liquid Temperature to the
Leaving Chilled Liquid Temperature Setpoint.
System Coastdown
The chiller has shut down and the Post-run lubrica-
tion is being performed. The Coastdown duration is
determined by the setting of the Coastdown (stan-
dard or enhanced) and Coastdown Time Setpoints. If
the Coastdown setpoint is set to enhanced (steam tur-
bine applications), it is 15 minutes. If set to standard
(electric motor applications), it is programmable over
a range determined by the Chiller Style/Compressor
Setpoint (for style G/K6-K7, the range is 240 (default)
to 900 seconds.
Start Inhibit
The chiller is prevented from being started due to the
reason displayed on the Details Line of the Status Bar.
Vanes Closing Before Shutdown
Displayed while the Pre-Rotation Vanes are closing
during a Soft Shutdown. During Soft Shutdowns, the
Vanes are driven fully closed prior to shutting down the
compressor. When the Vane Motor End Switch closes,
indicating the Vanes have fully closed (or 3.5 minutes
have elapsed, whichever occurs first), the Run Signal
is removed from the compressor motor starter and a
System Coastdown is performed. Soft Shutdowns are
initiated by the following:
3
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