York YPAL 050 User Manual

JOHNSON CONTROLS

FORM 100.50-NOM6 (1207)

•

  The supply air temperature must be below the 

“SUPPLY AIR TEMP ALARM SETPOINT FOR 
HEATING” set point and the following sequence 
of events have occurred:

–  All the stages of heating must have been on 

for 10 or more minutes.

–  The outdoor air is 20.0° F or more cooler then 

the “SUPPLY AIR TEMP ALARM SETPOINT 
FOR HEATING” set point.

–  The economizer must be open more than 

20%.

•

  If the above criteria is met

–  The Simplicity Elite control will close the 

outdoor damper for ten minutes.

–  After ten minutes, the Simplicity Elite control 

will read the supply air temperature.

–  If the supply air temperature is above the 

“SUPPLY AIR TEMP ALARM SETPOINT 
FOR HEATING”, the control will keep the 
outdoor damper closed and complete the 
heating cycle.

∗

 

The Simplicity Elite control will declare an 
“ECONOMIZER MINIMUM POSITION” 
Alarm and fl ash an Alarm Code 40.

–  If the supply air temperature is not above the 

“SUPPLY AIR TEMP ALARM SETPOINT 
FOR HEATING”.

∗

 

The Simplicity Elite control will declare 
a  “SUPPLY AIR TEMP ALARM FOR 
HEATING”  Alarm and fl ash  an Alarm 
Code 39.

–  After the heating cycle is completed, the Sim-

plicity Elite control sets the outdoor damper 
to its minimum position.

–  In order to reset the above alarms power to 

the unit must be cycled on and off. 

When this feature is turned, on the Simplicity Elite 
control monitors the supply air temperature in the 
cooling mode and will generate an alarm if the supply air 
temperature goes above the set point, and if conditions 
are met, modifi es the amount of ventilation air to keep 
the supply air temperature below this set point when all 
the cooling stages are energized.  This feature can only 
be used on unit operating in the VAV mode.

In order to use this feature the following parameter must 
be programmed:

“SUPPLY AIR TEMP ALARM SETPOINT FOR 
COOLING” – must be set under the COOLING SETUP 
tab of the Simplicity PC software package.

•

 If “SUPPLY AIR TEMP ALARM SETPOINT 

FOR COOLING” is set to zero this feature is 
disabled.  If not set to zero, then the setting be-
comes the alarm set point.

•

 Set “SUPPLY AIR TEMP ALARM SETPOINT 

FOR COOLING” to the temperature you want 
to use for the alarm set point.  The range is 1.0° 
F to 80.0° F in 1.0° F increments.

•

  The control will initiate a “SUPPLY AIR TEMP 

ALARM FOR COOLING” and fl ash an Alarm 
Code 38 if the following conditions are met:

–  All the stages of cooling have been on for 10 

or more minutes.

–  The supply air temperature is 20 degrees 

above the “SUPPLY AIR TEMP ALARM 
SETPOINT FOR COOLING” set point for 
10 minutes.

–  The outdoor air is not 20.0° F or more warmer 

then the “SUPPLY AIR TEMP ALARM 
SETPOINT FOR COOLING” set point.

–  The outdoor air damper is not open more than 

20%.

•

  In order to reset the above alarm power to the 

unit must be cycled on and off.