York J Series Manual page 80

Service
TABLE 19 - FAULT DESCRIPTIONS TABLE (Continued)
FAULT TITLE
RDU's HISTORY
BUFFER
Unit programmed to enable RAT
RAT Sensor Fault Sensor AND RAT sensor is not
Supply fan has been off for at
Air Switch Fault least for 5 minutes AND the Air
Proving Switch remains closed.
Unit Filter Switch input closes for
Unit Filter Fault
at least 1 minute.
Unit programmed for CV AND
the unit is being controlled by the
Space Sensor AND Operating
in cooling AND the (Space
Space Control
temp - setpoint) is greater than
Fault
'Space Temp Alarm Diff' and
increasing in value AND 'Space
Temp Alarm Time' setpoint has
SAT is equal to or greater than
Cooling SAT Alarm setpoint AND
Cooling SAT Fault
all available compressors have
been ON for 60 minutes.
SAT is equal to or less than the
Heating SAT Alarm setpoint AND
Heating SAT Fault
all heating stages have been ON
for at least 20 minutes.
Only one comp running AND
SAT is less than 'Stage 1
Cooling SAT Limit' for one
Excess Cooling
Fault
Two or more compressors
running: SAT is less than Stage
2-6 Cooling SAT Limit' for one
Excess Heating SAT is greater than 'Heating SAT
Fault Limit' for one minute.
80
SET WHEN RESET WHEN
Unit programmed to
disable RAT sensor OR
reliable. RAT sensor is reliable.
Supply fan has been off
for at least 5 minutes
AND Air Proving Switch
Unit Filter Switch input
'Space Temp Alarm Diff'
= 0 OR 'Space Temp
Alarm Time' = 0 OR
(Space temp - setpoint)
is decreasing in value.
expired.
SAT is less than the
Cooling SAT Alarm
setpoint.
SAT is greater than
the Heating SAT Alarm
setpoint.
If 'Stage 1 Cooling
Limit' caused the fault:
SAT is greater than
'Stage 1 Cooling Limit'
+ 5 degrees F) for 5
minute.
minutes.
If 'Stage 2-6 Cool Limit'
caused the fault: SAT is
greater than 'Stage 2-6
minute.
Cool Limit' + 5 degrees
F) for 5 minutes.
SAT is less than
('Heating SAT Limit' – 10
degrees F for 5 minutes.
SHUT
DOWN
(1)
TROUBLE
*
*
opens.
*
opens.
*
*
*
*
*
FORM 100.50-NOM7 (808)
GENERAL ADDITIONAL ACTIONS
STATUS or DISPLAYS
(3) (4)
ALARM
OpData/RA Temp = ???
*(14)
OpData/RA Enth = ???
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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.
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.
JOHNSON CONTROLS