York YPAL 051 User Manual

JOHNSON CONTROLS

FORM 100.50-NOM6 (1207)

“OUTSIDE AIR HUMIDITY SENSOR INSTALLED” 
- must be disabled using Parameter 36 under the 
PROGRAM key on the Simplicity Control board or 
under the EQUIPMENT INSTALLATION tab in the 
Simplicity PC software package. 

“RETURN AIR HUMIDITY SENSOR INSTALLED” 
- must be disabled using Parameter 38 under the 
PROGRAM key on the Simplicity Control board or 
under the EQUIPMENT INSTALLATION tab in the 
Simplicity PC software package.

“THIRD PARTY BAS ECONOMIZER INSTALLED” 
must be enabled using Parameter 58 under the 
PROGRAM key on the Simplicity Control board or 
under the EQUIPMENT INSTALLATION tab in the 
Simplicity PC software package.

In order to use this feature a 2 to 10 VDC external signal 
must be sent to the unit through the “BAS ECON +” 
and “BAS ECON -” connections on the Unit Control 
board. 

 
The Unit Controller sends the 2 to 10 VDC input signal 
directly to the analog output terminals “ECO +” and 
“ECO -” to the damper actuator. A 2 VDC input from 
the external source will result in a 2 VDC signal to the 
damper actuator. 

The following parameter must be programmed to allow 
economizer operation:

“ECONOMIZER FIRST STAGE SETPOINT” – must be 
programmed using Parameter 33 under the PROGRAM 
key on the Simplicity control board or under the 
ECONOMIZER/EXHAUST tab in the Simplicity PC 
software package.

“ECONOMIZER SECOND STAGE SETPOINT” 
– must be programmed using Parameter 34 under 
the PROGRAM key on the Simplicity control board 
or under the ECONOMIZER/EXHAUST tab in the 
Simplicity PC software package.

The Simplicity Control will try to modulate the outdoor 
air damper and the compressors to maintain the supply 
air temperature to +/- 1.0° F of the following set points 
based on the method of control:

•

  With a Y1 input from a thermostat the Simplic-

ity Control will use the “ECONOMIZER FIRST 
STAGE SETPOINT”.

•

  With a Y2, Y3, or Y4 input from a thermostat the 

Simplicity Control will use the “ECONOMIZER 
SECOND STAGE SETPOINT”.

•

  When the space temperature is 1.5° F to 1.9° 

F above the “CV OCCUPIED COOLING 
SETPOINT” or  “CV UNOCCUPIED COOLING 
SETPOINT” the Simplicity Control will use the 
“ECONOMIZER FIRST STAGE SETPOINT”.

•

  When the space temperature is 2.0° F above the 

“CV OCCUPIED COOLING SETPOINT” or  
“CV UNOCCUPIED COOLING SETPOINT” 
the Simplicity Control will use the “ECONO-
MIZER SECOND STAGE SETPOINT”.

The Simplicity Control will try to modulate the outdoor 
air damper and the compressors to maintain the supply 
air temperature to +/- 1.0° F of the following set points 
based on the method of control:

•

  With a Y1 input from a thermostat the Simplicity 

Control will use the “VAV COOLING SUPPLY 
AIR TEMP UPPER SETPOINT”.

•

  With a Y2, Y3, or Y4 input from a thermostat the 

Simplicity Control will use the “VAV COOLING 
SUPPLY AIR TEMP LOWER SETPOINT”.

•

  When the space temperature is less then 2.0° 

F above the “VAV SUPPLY AIR TEMP RESET 
SETPOINT” the Simplicity Control will use the 
“VAV COOLING SUPPLY AIR TEMP UPPER 
SETPOINT”.