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YORK INTERNATIONAL56
DIAGNOSTICS RCC COMMS SCREEN
OVERVIEW
This screen is accessed from the Diagnostics Screen.
This screen provides a view of communication for
troubleshooting .
Communication between the OptiView RCC and the
chiller/condenser control panel(s) should consist of
the RCC polling (requesting a response from) each
chiller/condenser control panel starting with Unit 1
and continuing to Unit “x”, where “x” is the Number
of Units Connected as entered on the RCC Setpoints
Screen. Each poll will increment the Poll Count. A
reply should be sent back to the RCC from the Unit that
was polled within a certain amount of time. If this reply
does not happen within this time period the Timeout
Count will be incremented. If the reply is returned but
contains improper data, then the Bad Csum Count will
be incremented. If the reply is successfully received by
the RCC then the Reply Count is incremented.
Good communication is indicated by the Poll Count
and the Reply Count keeping close to the same
count. A high Timeout Count could imply that the
chiller/condenser control panel did not properly receive
the request or it did not properly send a response.
Check the wiring and the Installation Checklist. A high
Bad Csum Count could be indicative of noise being
transmitted. This can happen because of improper
wiring or grounding.
DISPLAY ONLY
Unit Type
Displays the chiller type, whether it is a “Screw”,
“Recip”, or Scroll” and the number of compressors for
the “Unit x”, where x is the number of the unit.
Poll Indicator (LED)
Is on when the last noted communication through the
Com3 port was to poll a chiller/condenser control
panel.
Reply Indicator (LED)
Is on when the last noted communication through
the Com3 port was to receive a reply from a chiller/
condenser control panel.
Poll Count
A count of each poll request through the Com3 port to
a chiller/condenser control panel.
Reply Count
A count of each reply successfully received through the
Com3 port from a chiller/condenser control panel.
Bad Csum Count
A count of each reply received through the Com3 port
from a chiller/condenser control panel that had a bad
Csum calculation. This indicates that improper data
was received.
FIG. 26
00526VIPC
Operation