York YPAL 060 User Manual

JOHNSON CONTROLS

FORM 100.50-NOM6 (1207)

This alarm indicates the outdoor humidity sensor is 
out of range.  When this occurs the Unit Controller 
will switch economizer operation to Dry Bulb.  The 
Outdoor Humidity analog input is at OH+ wire 333 of 
the P6 connector and OH- wire 334 of the P6 connector.  
To trouble shoot the sensor verify 24 VAC between 
terminals EXC and COM of the sensor.  Also verify 
the VDC between the OUT and COM connection of the 
sensor.  If no voltage is present replace the sensor.

This alarm indicates the return humidity sensor is out 
of range.  When this occurs the Unit Controller will 
switch economizer operation to Single Enthalpy.  The 
Return Humidity analog input is at RH+ wire 335 of 
the P6 connector and OH- wire 336 of the P6 connector.  
To trouble shoot the sensor verify 24 VAC between 
terminals EXC and COM of the sensor.  Also verify 
the VDC between the OUT and COM connection of the 
sensor.  If no voltage is present replace the sensor.

This alarm indicates the IAQ (CO2) sensor is out of 
range.  When this occurs the Unit Controller will switch 
the ventilation mode from Demand to Fixed Minimum.  
The IAQ sensor input is at terminal DV+ and DV-.  This 
device is fi eld supplied.

This alarm indicates the Unit Controller Real Time 
Clock is not functioning.  The Unit Controller will shut 
down all operation.  Try recycling power to the control.  
If the fault reappears replace the Unit Controller.

This alarm is generated when the resistance in the Space 
Temperature Offset circuit is greater then 20,000 ohms.  
The Space Temperature Offset input is at terminals SSD 
and GND of the P6 connector.  Check the resistance 
between these to points.  If greater then 20,000 ohms 
check the tightness of the connections and the wire 
wiring between the Unit Controller and the space sensor.  
If both are okay and the resistance is still greater then 
20,000 ohms replace the space sensor reset.

This alarm indicates the resistance between terminals 
CV/VAV and CV/VAV at the P7 connection is out of 
range.  The acceptable range is 0.0 to 20,000 ohms.  
Check the resistance between the two CV/VAV terminals 
and take appropriate action.

The Unit Controller monitors the 24 VAC input to the 
control.  The input has two thresholds.  The voltage 
must be above 19.2 VAC or the control will not turn on 
a contactor.  If the voltage is not above this value it will 
not turn on the contactor and fl ashes the fault code.  If 
contactors are energized and the voltage drops below 
16 .0 volts the Unit Controller will de-energize the 
contactors and fl ash the alarm.  To trouble shoot check 
the voltage between the “R” and “COM” at the ¼ inch 
terminals on the board.

This is not an alarm but rather an indication the unit 
has been placed in a smoke purge mode.  Verify the 
presence of 24 VAC between PURGE connection at 
the P3 connector and “C” on the P1 connector.  If 24 
VAC is present and the unit is not supposed to be in the 
Purge mode trace the fi eld wiring to determine why the 
voltage is present.

This alarm indicates the duct static pressure has exceeded 
the Duct Static Shutdown Setpoint.  The problem could 
be caused by a faulty Duct Static Pressure Transducer 
input.  To check measure the VDC input between 
terminal DP+ wire 337 at the P21 connector and 
terminal DP- wire 338 at the P21 connector.  Compare 
the voltage verses the duct pressure the control indicates 
to Table 8-2 in this section of the manual.  Also verify 
that 24 VAC is present between terminals “COM” and 
“EXC” at the duct static transducer.