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YORK INTERNATIONAL
94
FORM 160.55-O1 (604)
DISPLAY MESSAGES
The Status Bar of the Display contains a Status Line
and, beneath it a Details Line. The Status Line con tains
a message describing the operating state of the chiller;
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 Mes sag es
list ed be low are displayed on the Status Line. All other
mes sag es are displayed on the Details Line.
To aid in the meaning of the message, messages are
displayed in different colors as follows:
Normal Operation mes sag es - Green
Warning messages - Yellow
Cycling Shutdown mes sag es - Orange
Safety Shutdown mes sag es - Red
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 dis played
on the Details line of the Status Bar. The chiller will
au to mat i cal ly restart when the CYCLING con di tion
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 Op er a tor
moves the COMPRESSOR switch to the STOP-RESET
(O) position.
“SYSTEM PRELUBE”
A chiller start has been initiated and the pre-start lu-
bri ca tion is being performed. The Prelube duration is
ei ther 30 seconds or 180 seconds, as conÞ gured with
a Microboard Program Switch. The Pre-lube duration
must nev er be changed by anyone other than a quali-
Þ ed Ser vice Tech ni cian. The standard Prelube duration
is 30 sec onds.
“SYSTEM RUN”
The chiller is running under the condition described in
the Details Line of the Status Bar.
“SYSTEM COASTDOWN”
The chiller has shut down and the Post-run lubrication is
being performed. On electric motor drive ap pli ca tions,
the Postlube duration is 150 seconds. On Steam Tur bine
applications, it is 15 minutes. The actual du ra tion is de-
ter mined by a Microboard Program Jumper, con Þ g ured
by a qualiÞ ed Service technician.
“START INHIBIT”
The chiller is prevented from being started due to the
reason displayed on the Details Line of the Status bar.
RUN MESSAGES
“MOTOR – HIGH CURRENT LIM IT”
The Compressor Motor current is > the Local or Re mote
Current Limit Setpoint. The Current Limit Setpoint is
pro grammed over a range of 30 to 100% of the Chill er
Full Load Amps (FLA). When the motor current in-
creas es to the “inhibit open” threshold, the Pre-rotation
Vanes are inhibited from further opening. This prevents
a fur ther cur rent rise. If the current continues to rise
to the “start close” threshold, the Vanes begin closing
until the current falls to the “stop close” threshold. Au-
to mat ic Vane operation is resumed and this message
au to mat i cal ly clears when the motor current decreases to
the “allow open” thresh old. The thresholds are dif fer ent
for the var i ous motor start er applications. To allow Þ eld
calibration of the Solid State Starter (Mod “A”) Logic
Board or CM-2 Current Module, pressing the Slide Valve
Load key in Service access level, starts a 10 minute timer
during which the current limit thresh olds are elevated.
Refer to table on next page.
Vane Control
Motor Current (%FLA)
Electro-Me chan i cal/
VSD Ser vice Mode
Solid state starter
On rise, inhibit open 100 100 107
On fall, allow open 98 98 106
On rise, start close 104 103 110
On fall, stop close 102 101 109
An example of current limit is as follows: If a Solid Sate
Starter chiller FLA is 100 Amps and the Current Limit
Setpoint is 50%, the following will occur:
50 Amps – inhibit vane open
52 Amps – vanes begin closing
51 Amps – vanes stop closing
49 Amps – allow automatic vane control
“LEAVING CHILLED LIQUID CONTROL”
The chiller is running, controlling the Leaving Chilled
Liq uid to the Leaving Chilled Liquid Temperature
Setpoint. There are no system conditions inhibiting
this operation.
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