York YPAL 050, YPAL 061 Single Enthalpy, Dual Enthalpy, “Outside Air Humidity Sensor Installed”

Single Enthalpy

The following parameters must be programmed to allow economizer operation:

“ECONOMIZER OUTSIDE AIR ENTHALPY SETPOINT” – must be programmed using Parameter 37 under the PROGRAM key on the Simplicity control board or under the ECONOMIZER/EXHAUST tab in the Simplicity PC software package.

“OUTSIDE AIR HUMIDITY SENSOR INSTALLED”

–must be enabled using Parameter 36 under the PROGRAM key on the Simplicity control board or under the EQUIPMENT INSTALLATION tab in the Simplicity PC software package.

The economizer will become active and use outdoor air for cooling when:

•The outside air enthalpy is less then or equal to the “ECONOMIZER OUTSIDE AIR ENTHALPY SETPOINT”.

•The Simplicity Control has a demand for cooling operation.

•If the outdoor air enthalpy was above the

“ECONOMIZER OUTSIDE AIR ENTHALPY SETPOINT” when the cooling cycle was initiated the Simplicity Control will activate economizer operation when the outdoor air enthalpy is 1.0 BTU/LB below the “ECONOMIZER OUTSIDE AIR ENTHALPY SETPOINT”.

The economizer will become inactive and eliminate the use of outdoor air for cooling when:

•The outside air enthalpy is 1.0 BTU/LB greater than the “ECONOMIZER OUTSIDE AIR ENTHALPY SETPOINT”.

•The Simplicity Control does not have an Occu- pied or Unoccupied cooling demand.

FORM 100.50-NOM6 (1207)

Dual Enthalpy

The following parameter must be programmed to allow economizer operation:

“RETURN AIR HUMIDITY SENSOR INSTALLED”

–must be enabled using Parameter 38 under the PROGRAM key on the Simplicity control board or under the EQUIPMENT INSTALLATION tab in the Simplicity PC software package.

“DIFFERENTIALENTHALPYMODEENABLED”must be turned ON under the ECONOMIZER/EXHAUST tab in the Simplicity PC software package.

The economizer will become active and use outdoor air for cooling when:

•The outside air enthalpy is 1.0 BTU/LB less then the return air enthalpy.

•The Simplicity Control has a demand for cooling operation.

The economizer will become inactive and eliminate the use of outdoor air for cooling when:

• The outside air enthalpy is equal to or greater	5
than the return air enthalpy.

•The Simplicity Control does not have an Occu- pied or Unoccupied cooling demand.

BAS ECONOMIZER OPERATION

This feature allows the outdoor/return air damper to be controlled by an external 2 to 10 VDC input.

The following parameters must be programmed to allow

BAS ECONOMIZER OPERATION:

“ECONOMIZER INSTALLED” - must be disabled using Parameter32underthePROGRAMkeyontheSimplicity Control board or under the ECONOMIZER/EXHAUST tab in the Simplicity PC software package.

JOHNSON CONTROLS 77