JOHNSON CONTROLS
101
SECTION 7 – UNIT CONTROLS
FORM 150.27-NM1
ISSUE DATE: 09/30/2015
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.
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.
U N I T S W I T C H O F F
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.
`
The DAILY SCHEDULE SHUTDOWN message in-
dicates that the daily/holiday schedule programmed is
keeping the unit from running.
REMOTE STOP NO RUN PERM shows that either
the flow switch is open or a remote start/stop contact is
open in series with the flow switch. These contacts are
connected to J13-5. A 3-second delay is built into the
software to prevent nuisance shutdowns due to errone-
ous signals on the run permissive input.
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.
R E M O T E C O N T R O L L E D
S
H
U T D
O
W
N
D A I L Y S C H E D U L E
S
H
U T D
O
W
N
REMOTE STOP
NO RUN PERM
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
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