York YPAL 060 User Manual

JOHNSON CONTROLS

FORM 100.50-NOM6 (1207)

The following values need to be programmed:

“DUCT PRESSURE SETPOINT” – Using parameter 
30 under the PROGRAM key on the Simplicity control 
board or under the FAN tab in the Simplicity PC 
software package.

“DUCT PRESSURE SHUTDOWN SETPOINT” 
– By using the FAN tab in the Simplicity PC software 
package.

The Simplicity Control uses a proportional-integral 
control algorithm to maintain the “DUCT PRESSURE 
SETPOINT” by varying the speed of the supply fan.  As 
the duct static pressure goes up the speed goes down.  

On a call for supply fan operation the Simplicity Control 
sends a 24 VAC signal from the FAN terminal of the 
P13 connector to the supply fan relay.

The Duct Static Pressure Transducer has a range of 0.0 
to 5.0” WC.  The transducer sends a 0.0 to 5.0 volt DC 
signal to the Simplicity Control through the DP+ and 
DP- connections at the P21 connector.  The Simplicity 
Control then sends a 2.0 to 10.0 volt DC signal to the 
supply fan VFD through the VFD+, VFD- terminals at 
connector P14 to vary the speed of the VFD.

If the duct static pressure is equal to or greater than the 
“DUCT PRESSURE SHUTDOWN SETPOINT” the 
Unit Controller will turn off all outputs and lockout 
until the control is reset.

Economizer is used in the cooling mode only.  As soon 
as the unit switches into Occupied or Unoccupied 
Cooling and the conditions are within the programmed 
guidelines for economizer operation the Simplicity 
Control will attempt to use outdoor air to lower the 
supply air temperature to the active economizer set 
point.  The Simplicity Control can be confi gured to use 
the following economizer control methods:

•

 Dry 

Bulb

•

 Single 

Enthalpy

•

 Dual 

Enthalpy

The following parameter must be programmed to allow 
economizer operation:

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

The following parameter must be programmed to allow 
economizer operation:

“ECONOMIZER OUTSIDE AIR TEMP ENABLE 
SETPOINT” – must be programmed using Parameter 
39 under the PROGRAM key on the Simplicity control 
board or 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 temperature is less then or equal 

to the “ECONOMIZER OUTSIDE AIR TEMP 
ENABLE SETPOINT”.

•

  The Simplicity Control has a demand for cooling 

operation.

•

  If the outdoor air temperature was above the 

“ECONOMIZER OUTSIDE AIR TEMP ENABLE 
SETPOINT” when the cooling cycle was initi-
ated, the Simplicity Control will activate econo-
mizer operation when the outdoor air temperature 
is 1.0° F below the “ECONOMIZER OUTSIDE 
AIR TEMP ENABLE SETPOINT”.

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

•

  The outside air temperature is 1.0° F greater than 

the “ECONOMIZER OUTSIDE AIR TEMP EN-
ABLE SETPOINT”.

•

  The Simplicity Control does not have an Occu-

pied or Unoccupied cooling demand.