QUANTECH
115
FORM QTC4-NM1
ISSUE DATE: 4/2/2018
8
LD21850
STATUS
KEY
STATUS KEY OPERATION
The STATUS key displays the current chiller or sys-
tem operational status. The messages displayed in-
clude running status, cooling demand, system faults,
unit faults, VSD faults, unit warnings, external device
status, load limiting, anti-recycle timer, status of unit/
system switches, and a number of other messages.
Pressing the STATUS key will enable the operator to
view the current status of the chiller. The display will
show one message relating to the “highest priority” in-
formation as determined by the microprocessor. There
are three types of status data, which may appear on the
display:
• General Status messages
• Unit Safeties
• System Safeties.
When power is first applied to the control panel, the
following message displaying Johnson Controls Inter-
national, the EPROM version, date, and time will be
displayed for 2 seconds, followed by the appropriate
general status message:
(C)2004 JOHNSON CONTROLS INTERNATIONAL
C.XXX.XX.XX 18-SEPT-2010 12:45: AM
Unit status messages occupy 2 lines of the Status mes-
sage display. If no unit status message applies, individ-
ual status messages for each system will be displayed.
Any time the STATUS key is pressed or after the
EPROM message disappears at power-up, a status dis-
play indicating chiller or system status will appear.
Multiple STATUS messages may appear and can be
viewed by pressing the STATUS key repeatedly to al-
low scrolling through as many as three STATUS mes-
sages, which could possibly be displayed at any time
on a 2 compressor chiller.
Examples of the typical Status messages are shown in
the next topic
GENERAL STATUS MESSAGES
UNIT STATUS
MANUAL OVERRIDE
This message indicates the chiller is operating in
MANUAL OVERRIDE mode. This message is a pri-
ority message and cannot be overridden by any other
STATUS message. When in Manual Override, no other
status message will ever be present.
SECTION 8 - MICROPANEL
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