JOHNSON CONTROLS
170
FORM 100.50-NOM12
ISSUE DATE: 04/02/2019
SECTION 8 – SERVICE
Table 66 on page 177 lists the faults / warnings that
is displayed under the STATUS and HISTORY keys
of the User Interface. When a fault is present line two
of the effected STATUS screen display (UNIT-OVER-
ALL STATUS, COMPRESSOR SYSTEM 1, COM-
PRESSOR SYSTEM 2, COMPRESSOR SYSTEM
3, HEATING SYSTEM, ECONOMIZER SYSTEM,
SUPPLY SYSTEM, EXHAUST SYSTEM, VENTI-
LATION SYSTEM, or SENSOR / MISC STATUS)
will change nomenclature to indicate a WARNING,
SAFETY TRIP, SAFETY FAULT, or SAFETY LOCK-
OUT is present. A fault / warning description, method
of reset and conditions under which the information is
displayed is also contained in the table. Additional in-
formation for each of the faults is contained under their
respective segment of SECTION 5 – SEQUENCE OF
OPERATION located in this IOM.
When a fault is declared, the IPU board will record the
time of occurrence, the date of occurrence, and a com-
plete unit snapshot at the time of each occurrence in the
HISTORY buffer. This data can be retrieved using the
HISTORY key of the User Interface.
The HISTORY buffer stores the data from the last ten
faults from the most recent (HISTORY 01) to the old-
est (HISTORY 10). No fault HISTORY is eliminated
once recorded other than being “pushed off” of the end
of the list by a new fault when the buffer becomes full.
Warnings are only displayed in the HISTORY buffer
while they are active. When the problem that generated
the WARNING is corrected the record is removed from
the buffer. The IPU board does not record the time of
occurrence, the date of occurrence, or a complete unit
snapshot at the time of occurrence for a WARNING.
The HISTORY buffer is password protected and a level
2 password must be entered in order to view the data.
When the HISTORY key is pressed, the password
prompt will appear. After the proper level 2 password
has been entered the screen will show the first active
warning. If there are no active warnings present, the
first fault is displayed. If there are no faults in the HIS-
TORY buffer, the screen will display “NO FAULT.”
For menu navigation and display description, see His-
tory section on page 140 for additional information
on how to navigate through the HISTORY menu.
In addition to the items listed in Table 66 on page 177
,the following items listed below are contained under
the HISTORY key.
“COMPRESSOR SYSTEM (1,2, OR 3) CLEAR” -
Whenever there is a compressor safety trip the IPU
board initiates the “COMPR STATUS CLEAR TIME
(1,2, OR 3)” timer. The IPU board records the time it
takes for the trip to clear. When the fault clears “COM-
PRESSOR SYSTEM (1,2, OR 3) CLEAR” shows the
time it took for the fault to clear in the HISTORY buf-
fer.
“COMPRESSOR SYSTEM (1,2, OR 3)TIME OUT” –
If the “COMPR STATUS CLEAR TIME (1,2, OR 3)”
timer reaches 60 minutes a “COMPRESSOR SYSTEM
(1,2, OR 3) TIME OUT” is indicated in the HISTORY
buffer. In most cases this indicates the compressor cir-
cuit over current protector opened. The compressor cir-
cuit over current protector is a manual reset device and
the circuit would not reset in the required 60 minute
time frame. The STATUS key will display the message
“COMP SYS (1,2, OR 3) STATUS” “SAFETY LOCK-
OUT.” The IPU board locks out the corresponding
compressor system when a “COMPRESSOR SYSTEM
(1,2, OR 3)TIME OUT” is declared.
“COMPR SYSTEM (1,2, OR 3) INHIBIT” – This
WARNING indicates the compressor system safety
circuit experienced a trip but reset prior to the explora-
tion of the 60 minute reset time function. If the safety
circuit does not reset in 60 minutes it is replaced with
a “COMPRESSOR SYSTEM (1,2, OR 3)TIME OUT”
message.
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