York YPAL 050 User Manual

JOHNSON CONTROLS

FORM 100.50-NOM6 (1207)

“COOLING MODE OPERATION ENABLED” – must 
be enabled using Parameter 53 under the PROGRAM 
key on the Simplicity control board or under the 
COOLING SETUP tab in the Simplicity PC software 
package.

“HEATING MODE ENABLED FOR OPERATION” 
– must be enabled using Parameter 54 under the 
PROGRAM key on the Simplicity control board or 
under the HEATING SETUP tab in the Simplicity PC 
software package.

The Simplicity Control is set up to receive the following 
cooling/heating inputs from the thermostat:

The following System parameters must be programmed 
through the simplicity control:

“CV OCCUPIED COOLING SETPOINT” - This 
parameter must be programmed to 99.0º F. This can be 
programmed using parameter 10 under the PROGRAM 
key on the Simplicity control board or under the 
COOLING SETUP tab in the Simplicity PC software 
package.

“CV OCCUPIED HEATING SETPOINT” - This 
parameter must be programmed to 45.0º F. This can be 
programmed using parameter 11 under the PROGRAM 
key on the Simplicity control board or under the 
HEATING SETUP tab in the Simplicity PC software 
package.

“CV UNOCCUPIED COOLING SETPOINT” - This 
parameter must be programmed to 99.0º F. This can be 
programmed using parameter 12 under the PROGRAM 
key on the Simplicity control board or under the 
COOLING SETUP tab in the Simplicity PC software 
package.

“CV UNOCCUPIED HEATING SETPOINT” - This 
parameter must be programmed to 45.0º F. This can be 
programmed using parameter 13 under the PROGRAM 
key on the Simplicity control board or under the 
HEATING SETUP tab in the Simplicity PC software 
package.

•

  Y1 – First Stage of Cooling – 1st compressor 

from System 1.

•

  Y2 – Second Stage of Cooling – 2nd compressor 

from System 1.

•

  Y3 – Third Stage of Cooling – 1st compressor 

from System 2.

•

  Y4 – Fourth Stage of Cooling – 2nd compressor 

from System 2.

Unoccupied cooling operation is the same as Occupied.  
A programmable thermostat would be required in order 
to change the cooling temperature settings between 
occupied and unoccupied.

If the Simplicity Control receives both a “Y” cooling 
call and “W” heating call at the same time the control 
will function and operate in the heating mode.

The YPAL 50 to 65-ton unit has four stages of 
mechanical cooling available and it is recommended 
that a four stage cooling thermostat be used.  However, 
a two stage cooling thermostat could be used by 
connecting Y1 from the thermostat to Y1 and Y2 on 
the Simplicity fi eld connection terminal block and Y2 
from the thermostat to Y3 and Y4 on the Simplicity fi eld 
connection terminal block. 

In this mode of operation, the Simplicity will operate 
as a two-stage control.  On the 50 to 65 ton unit the 
compressors will be grouped as follows:

•

  First stage – Compressors 1A and 1B – System 

1 compressors – minimum 30 second delay be-
tween compressors.

•

  Second stage – Compressors 2A and 2B – Sys-

tem 2 compressors – minimum 30 second delay 
between compressors.