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YORK INTERNATIONAL
61
FORM 150.62-NM1
Sys Switch Off tells that the system switch under OP-
TIONS is turned off. The system will not be allowed to
run until the switch is turned back on.
These messages inform the operator that the chilled
liquid 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 re-
spective system is running due to demand. The “X” will
be replaced with the number of compressors in that sys-
tem that are running.
The anti-recycle timer message shows the amount of
time left on the respective systems anti-recycle timer.
This message is displayed when the system is unable
to start due the anti-recycle timer being active.
The anti-coincident timer is a software feature that
guards against 2 systems starting simultaneously. This
assures instantaneous starting current does not become
excessively high due to simultaneous starts. The micro
limits the time between compressor starts to 1 minute
regardless of demand or the anti-recycle timer being
timed out. The anti-coincident timer is only present on
two system units.
When this message appears, discharge pressure limit-
ing is in effect. The Discharge Pressure Limiting fea-
ture is integral to the standard software control; how-
ever the discharge transducer is optional. Therefore, it
is important to keep in mind that this control will not
function unless the optional discharge transducer is in-
stalled in the system.
The limiting pressure is a factory set limit to keep the
system from faulting on the high discharge pressure
cutout due to high load or pull down conditions. When
the unload point is reached, the micro will automatically
unload the affected system by deenergizing one com-
pressor. The discharge pressure unload will occur when
the discharge pressure gets within 15 PSIG of the pro-
grammed discharge pressure cutout. This will only hap-
pen if the system is fully loaded and will shut only one
compressor off. If the system is not fully loaded, dis-
charge limiting will not go into effect. Reloading the af-
fected system will occur when the discharge pressure
drops to 85% of the unload pressure and 10 minutes
have elapsed.
SYS 1 NO COOL LOAD
SYS 2 NO COOL LOAD
SYS 1 SYS SWI TCH OFF
SYS 2 SYS SWI TCH OFF
SYS 1 AR T IMER XX S
SYS 2 AR T IMER XX S
SYS 1 COMPS RUN X
SYS 2 COMPS RUN X
SYS 1 AC T IMER XX S
SYS 2 AC T IMER XX S
SYS 1 DSCH L IMI T I NG
SYS 2 DSCH L IMI T I NG
2