JOHNSON CONTROLS
125
SECTION 7 – UNIT CONTROLS
FORM 150.72-ICOM6
ISSUE DATE: 08/03/2022
7
STATUS KEY
Unit Status
Pressing the STATUS key will enable the operator to
determine current chiller operating status. The messag-
es displayed will include running status, cooling de-
mand, fault status, external cycling device status. The
display will be a single message relating to the highest
priority message as determined by the microprocessor.
Status messages fall into the categories of General Sta-
tus and Fault Status.
The following General, Safety, and Warning messages
are displayed when the STATUS key is pressed. Fol-
lowing each displayed message is an explanation per-
taining to that particular message.
General Status Messages
In the case of messages which apply to individual
systems, SYS 1 and SYS 2 messages will both be dis-
played and may be different. In the case of single sys-
tem units, all SYS 2 messages will be blank.
U N I T S W I T C H O F F
S H
U T D
O
W
N
This message informs the operator that the UNIT switch
on the control panel is in the OFF position which will
not allow the unit to run.
R E M O T E C O N T R O L L E D
S H
U T D
O
W
N
The REMOTE CONTROLLED SHUTDOWN mes-
sage indicates that either an ISN system or RCC has
turned the unit OFF, not allowing it to run.
D A I L Y S C H E D U L E
S H
U T D
O
W
N
The DAILY SCHEDULE SHUTDOWN message in-
dicates that the daily/holiday schedule programmed is
keeping the unit from running.
R E M O T E S T O P
N O R U N P E R M
REMOTE STOP NO RUN PERM shows that a remote
start/stop contact is open in series with the flow switch.
These contacts are connected to Terminals 51 and 13 of
XTBC1. A 3-second delay is built into the software to
prevent nuisance shutdowns due to erroneous signals
on the run permissive input.
F L O W S W I T C H
O P E N
FLOW SWITCH OPEN indicates the flow switch con-
tacts connected to Terminals 13 and 14 of XTBC1 are
open. A 3-second delay is built into software to prevent
nuisance shutdowns due to erroneous signals from the
flow switch.
S Y S 1 S Y S S W I T C H O F F
S Y S 2 S Y S S W I T C H O F F
SYS SWITCH OFF tells that the system switch under
OPTIONS is turned OFF. The system will not be al-
lowed to run until the switch is turned back ON.
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