JOHNSON CONTROLS
80
FORM 100.50-NOM7 (808)
Service
RAT Sensor Fault
Unit programmed to enable RAT
Sensor AND RAT sensor is not
reliable.
Unit programmed to
disable RAT sensor OR
RAT sensor is reliable.
*
*(14)
OpData/RA Temp = ???
OpData/RA Enth = ???
Air Switch Fault
Supply fan has been off for at
least for 5 minutes AND the Air
Proving Switch remains closed.
Supply fan has been off
for at least 5 minutes
AND Air Proving Switch
opens.
*
––
Unit Filter Fault
Unit Filter Switch input closes for
at least 1 minute.
Unit Filter Switch input
opens.
*
––
Space Control
Fault
Unit programmed for CV AND
the unit is being controlled by the
Space Sensor AND Operating
in cooling AND the (Space
temp - setpoint) is greater than
‘Space Temp Alarm Diff’ and
increasing in value AND ‘Space
Temp Alarm Time’ setpoint has
expired.
‘Space Temp Alarm Diff’
= 0 OR ‘Space Temp
Alarm Time’ = 0 OR
(Space temp - setpoint)
is decreasing in value.
*
––
Cooling SAT Fault
SAT is equal to or greater than
Cooling SAT Alarm setpoint AND
all available compressors have
been ON for 60 minutes.
SAT is less than the
Cooling SAT Alarm
setpoint.
*
––
Heating SAT Fault
SAT is equal to or less than the
Heating SAT Alarm setpoint AND
all heating stages have been ON
for at least 20 minutes.
SAT is greater than
the Heating SAT Alarm
setpoint.
*
––
Excess Cooling
Fault
Only one comp running AND
SAT is less than ‘Stage 1
Cooling SAT Limit’ for one
minute.
Two or more compressors
running: SAT is less than Stage
2-6 Cooling SAT Limit’ for one
minute.
If ‘Stage 1 Cooling
Limit’ caused the fault:
SAT is greater than
‘Stage 1 Cooling Limit’
+ 5 degrees F) for 5
minutes.
If ‘Stage 2-6 Cool Limit’
caused the fault: SAT is
greater than ‘Stage 2-6
Cool Limit’ + 5 degrees
F) for 5 minutes.
*
Destage compressors
at one minute intervals,
if necessary, to reduce
the SAT and prevent
a cooling stage from
starting until SAT is
greater than respective
‘Cooling Limit’ + 5
degrees F for 5 minutes.
Excess Heating
Fault
SAT is greater than ‘Heating SAT
Limit’ for one minute.
SAT is less than
(‘Heating SAT Limit’ – 10
degrees F for 5 minutes.
*
Destage heaters at
one minute intervals, if
necessary, to reduce the
SAT. Prevent a heating
stage from starting until
SAT is less than ‘Heating
SAT Limit’ – 10 degrees
F for 5 minutes.
FAULT TITLE
RDU’s HISTORY
BUFFER
SET WHEN
RESET WHEN
SHUT
DOWN
(1)
GENERAL
STATUS
ADDITIONAL ACTIONS
or DISPLAYS
(3) (4)
TROUBLE ALARM
TABLE 19 - FAULT DESCRIPTIONS TABLE (Continued)
Summary of Contents for J Series
Page 85: ...FORM 100 50 NOM7 808 85 JOHNSON CONTROLS 6 ELECTRICAL NOTES AND LEGEND LD13862 ...
Page 87: ...FORM 100 50 NOM7 808 87 JOHNSON CONTROLS 6 LD13864 ...
Page 88: ...JOHNSON CONTROLS 88 FORM 100 50 NOM7 808 Service OPTI CONVERSION TO 25 40 TON LD13854 ...
Page 89: ...FORM 100 50 NOM7 808 89 JOHNSON CONTROLS 6 LD13865 ELEMENTARY DIAGRAM ALL UNITS ...
Page 91: ...FORM 100 50 NOM7 808 91 JOHNSON CONTROLS 6 ELEMENTARY DIAGRAM GAS HEAT 25 40 TON 575V LD13861 ...
