York MILLENNIUM, Operating Instructions Manual

Page: 4 / 16

4
YORK INTERNATIONAL
Pressing the STATUS key will enable the operator to
determine the present operating status of the chiller.
The messages displayed will include running status,
cooling demand, fault status, external cycling device
status, load limiting and anti-recycle timer status. The
display will be a single message relating to the highest
priority message as determined by the microprocessor.
Status messages fall into the categories of General and
Fault Status with each of the categories discussed be-
low.
General Status Messages
Each of the general status messages with a description
of its meaning will follow. In the case of messages which
apply to individual systems, SYS 1 and SYS 2 mes-
sages will both be displayed and may be different. SYS
2 messages will be blanked out on single system units.
For a more detailed explanation of each status message,
refer to the Unit Installation, Operation and Mainte-
nance Manual.
This message informs the operator that the UNIT switch
on the control panel is in the OFF position, which will
not allow the unit to run.
The DAILY SCHEDULE SHUTDOWN message indi-
cates that either the daily/holiday schedule programmed
is keeping the unit from running or the time is incor-
rectly set.
The REMOTE CONTROLLED SHUTDOWN message
indicates that the RCC has turned the unit off, not al-
lowing it to run.
NO RUN PERM shows that either the flow switch (or
air proving switch) is open or a remote start/stop con-
tact is open in series with the flow switch.
STATUS MESSAGES
U N I T S W I T C H O F F
S H U T D O W N
D A I L Y S C H E D U L E
S H U T D O W N
R E M O T E C O N T R O L L E D
S H U T D O W N
F L O W S W I T C H / R E M S T O P
N O R U N P E R M
SYS SWITCH OFF tells that the system switch on the
microboard is turned off. The system will not be al-
lowed to run until the switch is turned back on.
These messages inform the operator that the chilled liq-
uid temperature is below the point (determined by the
setpoint and control range) that the micro will bring on
a system or that the micro has not loaded the lead sys-
tem far enough into the loading sequence to be ready to
bring the lag system ON. The lag system will display
this message until the loading sequence is ready for the
lag system to start.
The COMPS RUNNING message indicates that the
respective system is running due to demand. The ‘X’
will be replaced with the number of compressors in that
system that are running.
The anti-recycle timer message is displayed when the
system is unable to start due the anti-recycle timer be-
ing active.
The anti-coincident timer message is displayed when
the system is unable to start due the anti-coincident timer
being active.
When this message appears, discharge pressure limit-
ing is in effect.
S Y S 1 S Y S S W I T C H O F F
S Y S 2 S Y S S W I T C H O F F
S Y S 1 N O C O O L L O A D
S Y S 2 N O C O O L L O A D
S Y S 1 C O M P S R U N X
S Y S 2 C O M P S R U N X
S Y S 1 A R T I M E R
S Y S 2 A R T I M E R
S Y S 1 A C T I M E R
S Y S 2 A C T I M E R
S Y S 1 D S C H L I M I T I N G
S Y S 2 D S C H L I M I T I N G
Status Messages