York MILLENNIUM YCAR0315 Installation Operation & Maintenance page 115

Compressors Running:
S Y S # C O M P
S Y S # C O M P
This message indicates that the respective compressor
is running due to demand.
System Switches OFF:
S Y S # S Y S
S Y S # S Y S
This message indicates that the system switch on the
Microprocessor Board for the respective system is in
the OFF position. A system can only run if the system
switch is in the ON position. The switch for System 1
and System 2 should normally be in the ON position for
all models. Switches for System 3 and 4 should only be
in the ON position for three and four compressor chill-
ers respectively. See Section 9 (1.11), Figure 36, page
109 for the location of the system switches.
Anti-Recycle Timers:
S Y S # A R T I M E R
S Y S # A R T I M E R
The anti-recycle timer message shows the amount of
time remaining before a compressor can be called to
restart. These 300 - 600 sec. timers begin timing when
a compressor starts, although a minimum of two min-
utes must always elapse after a compressor shuts down,
before it may again restart. If a power failure occurs,
the anti-recycle timers will reset to 120 seconds after
power is restored. The purpose of the timer is to allow
for motor cooling to dissipate the heat generated by in-
rush current at start-up.
Anti-Coincidence Timers:
S Y S # A C
S Y S # A C
The anti-coincident timer guards against two or more
compressors starting simultaneously. This avoids exces-
sive instantaneous starting currents. A minimum of 60
seconds between compressor starts is maintained even
if demand is present and the anti-recycle timers are timed
out. The display shows the time before the respective
compressor can start. This display will only appear af-
ter the anti-recycle timers have timed out.
YORK INTERNATIONAL
R U N N I N G
R U N N I N G
S W I T C H O F F
S W I T C H O F F
0 S
1 2 0 S
T I M E R 6 0 S
T I M E R 6 0 S
Run Permissive Contacts OPEN:
S Y S # N O
S Y S # N O
This display indicates that an external cycling contact
and/or the flow switch connected to terminals 13 and
14 in the Logic Section(s) of the control panel(s) is/are
open. Whenever the contact(s) is /are open, the No Run
Permissive message will be displayed and the indicated
system will not run.
System No Cool Load:
S Y S # N O
S Y S # N O
This message indicates that chilled liquid temperature is
below the point where the microprocessor will bring the
lead system on and/or that the loading sequence has not
loaded the chiller far enough to bring the lag system on.
The lag system will display this message until the load-
ing sequence is ready for the lag system to start.
Pump Down:
S Y S 1 P U M P I N G
S Y S 2 P U M P I N G
This message indicates that the respective system is in
a pumpdown cycle. Pumpdown display messages oc-
cur on shutdowns where the cooling load has been met,
when a system switch is turned off, or on recycling
pumpdown. Note that only one compressor could be
pumping down, as shown in the following display:
S Y S 1 P U M P I N G
S Y S 2 C O M P
See Section 1.18 (page 111) for details of pumpdown
control and recycling pumpdown.
Manual Override:
M A N U A L
O V E R R I D E
This message indicates that the "Override" key has been
pressed and the daily schedule programmed into the
chiller is being ignored, and the chiller will start up when
water temperature is above the high limit of the Control
Range, the Chiller ON/OFF switch is ON, remote cy-
cling devices are closed, and system switches permit.
FORM 150.52-NM2 (1001)
R U N P E R M
R U N P E R M
C O O L L O A D
C O O L L O A D
D O W N
D O W N
D O W N
R U N N I N G
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