York YPAL 051 User Manual

JOHNSON CONTROLS

FORM 100.50-NOM6 (1207)

This option uses a manually adjustable outdoor air 
damper that can set in a fi xed position to control the 
amount of outdoor air that is brought into the building 
for ventilation.   As long as the supply fan is operative, 
ventilation air will be brought into the building. To 
adjust the damper:

•

  Loosen the wing nut that holds the adjustment 

handle in a fi xed position.

•

  Move the handle to the desired position.

•

  Tighten the wing nut to hold the handle in the 

desired position.

The following parameters must be programmed to 
enable Fixed Minimum Ventilation:

“ECONOMIZER INSTALLED” – must be enabled 
using Parameter 32 under the PROGRAM key 
on the Simplicity Elite control board or under the 
ECONOMIZER/EXHAUST tab in the Simplicity PC 
software package.

“ECONOMIZER MINIMUM POSITION” – must be 
programmed using Parameter 35 under the PROGRAM 
key on the Simplicity Elite control board or under the 
ECONOMIZER/EXHAUST tab in the Simplicity PC 
software package.

T h e   d a m p e r   w i l l   o p e n   t o   t h e   p r o g r a m m e d 
“ECONOMIZER MINIMUM POSITION” whenever 
the following conditions are met:

•

  The unit is in the occupied mode.

•

  There must be a 24-volt output from the Simplic-

ity Elite control to the supply fan control circuit.  
The output is contained at the “FAN” terminal 
of connector P13 on the Simplicity Elite control 
board.

•

  When the economizer becomes active the position 

of the dampers are controlled by the Economizer 
PI logic which could move the dampers beyond 
the  “ECONOMIZER MINIMUM POSITION”; 
however, the Economizer PI logic can never 
close the dampers less then the “ECONOMIZER 
MINIMUM POSITION”.

In this mode the Simplicity Elite control monitors the 
CO2 level in the conditioned space.  The Simplicity 
Elite control modulates the outdoor air damper beyond 
the “ECONOMIZER MINIMUM POSITION” in order 
to keep the CO2 level within +/- 100 PPM of the “IAQ 
SETPOINT”.

In order to use this feature a CO2 sensor must be installed 
in the conditioned space and connected to “DV+” and 
the “DV-“ terminals of the P20 connector.

The following parameters must be programmed to 
enable Demand Ventilation:

“ECONOMIZER INSTALLED” – must be enabled 
using Parameter 32 under the PROGRAM key 
on the Simplicity Elite control board or under the 
ECONOMIZER/EXHAUST tab in the Simplicity PC 
software package.

“ECONOMIZER MINIMUM POSITION” – must be 
programmed using Parameter 35 under the PROGRAM 
key on the Simplicity Elite control board or under the 
ECONOMIZER/EXHAUST tab in the Simplicity PC 
software package.

“DEMAND VENTILATION (IAQ) ENABLED” – must 
be enabled using Parameter 40 under the PROGRAM 
key of the Simplicity Elite control board or under the 
COMFORT / DEMAND VENTILATION tab in the 
Simplicity PC software package.

“IAQ SENSOR RANGE” - must be programmed 
using Parameter 41 under the PROGRAM key on the 
Simplicity Elite control board or under the COMFORT 
/ DEMAND VENTILATION tab in the Simplicity PC 
software package.

“IAQ SETPOINT” - must be programmed using 
Parameter 42 under the PROGRAM key on the 
Simplicity Elite control board or under the COMFORT 
/ DEMAND VENTILATION tab in the Simplicity PC 
software package.

“MAXIMUM IAQ ECONOMIZER POSITION” – must 
be programmed under the COMFORT / DEMAND 
VENTILATION tab in the Simplicity PC software 
package.