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When the chiller shuts down on a SAFETY or CY-
CLING shutdown or is being prevented from starting,
a mes sage is displayed providing the reason for the shut-
down. This message, along with all the chiller op er at ing
con di tions at the instant of the event are stored in the
Microboard battery-backed memory. This history data
can be displayed or printed using an optional print er.
The Operations Manual 160.54-O1 provides a detailed
description of this mes sage, including the con di tions
re quired to produce the message and conditions required
to restart the chiller.
Diagnostic Routines allow service analysis of the fol-
low ing functions:
• Display
• Analog inputs
• Digital inputs
• Digital outputs
• Serial Data ports
YORK INTERNATIONAL
Before beginning any troubleshooting, observe the shut-
down message and retrieve the HISTORY data of that
event. Refer to the Operations Manual for an ex pla na tion
of the message. The conditions required to pro duce the
message must be clearly understood before pro ceed ing.
(If this is not heeded, much time will be wast ed). Armed
with a knowledge of the overall sys tem architecture and
the function of each printed cir cuit board and signal fl ow
provided by this manual, pro ceed with the appropri-
ate Wiring Diagram listed above to trace the problem
through the system. Use the Di ag nos tic Routines where
appropriate.
FORM 160.54-M1(503)
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