York J Series Manual page 81

TABLE 19 - FAULT DESCRIPTIONS TABLE (Continued)
FAULT TITLE
RDU's HISTORY
BUFFER
The unit is programmed for VAV
operation AND the Duct Static Pressure
Excess Duct Pressure
is greater that the Duct Pressure Limit
setpoint.
Supply Fan has to be running for 60
Sup Fan Fault seconds AND Air Proving Switch has
not closed for 30 seconds.
COR (Change Over Relay) is
ENERGIZED (cooling requested) and
COR Status Fault COR Status input is NOT PRESENT, or
COR is ENERGIZED and COR input is
NOT PRESENT.
Unit programmed for VAV and Duct
Duct Sensor Fault static pressure sensor is not reliable
(open or shorted).
HW Freezestat parameter programmed
HW Freeze Fault ON AND HW Freezestat Input is
OPEN for 10 minutes.
Sys X Sfty Lockout #1
Three Comp Safety Trips within one
or
hour.
Sys X Sfty Lockout #2
SAT Sensor Fault SAT sensor is not reliable.
{Y1 OR Y2 = ON} AND {W1 OR W2
Thermostat Conflict
= ON}
Mixed Supply Air Temp input is
MSAT Sensor Fault
unreliable.
>= 30 sec since a compressor in a
given system was activated AND
Sys X Safety Trip
the corresponding 'Compressor
System Status input' = OFF for 30 sec.
Evap Freeze Fault
Space Sensor Enable = ON AND
Space Sensor Fault
'Space Sensor input' is unreliable.
Unit programmed for transducer
package AND both compressors are
High Press Unload x
ON in a given system AND 'Discharge
[ 1, 2 or 3]
Pressure is less than the Sys Unloading
Setpoint.
JOHNSON CONTROLS
SET WHEN RESET WHEN
Cycle power on controller.
Cycle power on controller.
Cycle power on controller.
Cycle power on controller.
HW Freezestat Tstat closes
for 5 minutes.
Cycle power on controller
OR the corresponding
Compressor. Safety Trip
Closes for 60 min.
SAT sensor is not reliable.
{(Y1 OR Y2 = ON) AND NOT
(W1 OR W2 = ON)} OR {Y1
AND Y2 AND W1 AND W2
= OFF}
Mixed Supply Air Temp is
reliable.
>= 10 minutes since fault
was set
'Space Sensor input' is
reliable OR Space Sensor
Enable' = OFF.
{OAT < (OAT @ unload
– 5F)} OR {Cycle power on
controller}.
GENERAL
SHUT
STATUS
DOWN
(1)
TROUBLE
*(5)
*
*
*
*(6)
*(7)
*
*
*
* (8)
*
(9)
Not used on Millenniums
*(12) *
*
FORM 100.50-NOM7 (808)
ADDITIONAL ACTIONS
or DISPLAYS
(3) (4)
ALARM
* ––
* ––
* ––
* ––
* HW valve = 100% open.
* ––
OpData/Supply Air Temp/Temp
*
= ???
* ––
* ––
––
'OpData/Space Temperature/
Temp' = ???
VAV Mode Only
Unit Controlled in 'Stand Alone
Control'.
Destage the compressor in
corresponding system with the
most run time.
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