YVAA Style A Air-Cooled Screw Liquid Chillers ... - Johnson Controls
YVAA Style A Air-Cooled Screw Liquid Chillers ... - Johnson Controls
YVAA Style A Air-Cooled Screw Liquid Chillers ... - Johnson Controls
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FORM 201.28-NM1.1<br />
ISSUE DATE: 8/29/2012<br />
HISTORY<br />
KEY<br />
History Key Operation<br />
The HISTORY key provides the user access to many<br />
unit and system operating parameters captured at the<br />
instant a unit or system safety (fault) shutdown occurs.<br />
The history buffer will also capture system data at the<br />
time of normal shutdowns such as cycling shutdowns.<br />
When the HISTORY key is pressed the following<br />
screen is displayed:<br />
HISTORY CHOOSE HISTORY TYPE<br />
◄ ► XXXXXXXXXXXXXXXXXXXXXXXXXXXX<br />
The ◄ and ► (ARROW) keys allow choosing between<br />
NORMAL SHUTDOWNS and FAULT SHUT-<br />
DOWNS. “Fault” shutdowns provide information on<br />
safety shutdowns, while “Normal” shutdowns provide<br />
chiller cycling information on temperature (demand),<br />
cycling, remote, system switch, etc., shutdowns that<br />
are non-safety related shutdowns. Once the selection<br />
is made, the � (ENTER) key must be pressed to enter<br />
the selection.<br />
Normal Shutdowns History<br />
If the NORMAL SHUTDOWNS History is selected,<br />
the following screen will be displayed:<br />
NORM HIST XX 18-JUN-20004 10:34:58 AM<br />
YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY<br />
HISTORY KEY<br />
SECTION 8 - MICROPANEL<br />
JOHNSON CONTROLS 105<br />
LD10605<br />
XX is the normal shutdown number. The display will<br />
provide date and time of the shutdown and the reason<br />
for the cycling shutdown (YYY….).<br />
The operator can view any of the stored 20 single display<br />
normal shutdown history buffers. History buffer<br />
number 1 provides the most recent shutdown information<br />
and buffer number 20 is the oldest safety shutdown<br />
information saved. The ◄ and ► (ARROW) keys allow<br />
scrolling between each of the history buffers. The ►<br />
(ARROW) key scrolls to the next normal history shutdown<br />
and the ◄ (ARROW) key scrolls to the previous<br />
normal history shutdown.<br />
The following display will typically be displayed on a<br />
normal shutdown due to shutdown on lack of cooling<br />
demand.<br />
NORM HIST XX 18-JUN-20004 10:34:58 AM<br />
SYS X COOLING DEMAND SHUTDOWN<br />
Fault Shutdowns History<br />
If the FAULT SHUTDOWNS History is selected, the<br />
following screen will be displayed:<br />
FAULT HIST XX 18-JUN-20004 10:34:58 AM<br />
YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY<br />
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