York YPAL 050 User Manual

JOHNSON CONTROLS

FORM 100.50-NOM6 (1207)

The Simplicity Control is capable of being confi gured 
for either Constant Volume (CV) or Variable Air 
Volume (VAV) operation.  To confi gure the unit for 
VAV operation a 10,000 to 20,000 ohm resister must be 
installed on the P7 (CV/VAV) connector on the control 
board.  If no resister is installed the unit is confi gured 
for CV operation.  The control board should already be 
confi gured from the factory based on the type of unit 
that was ordered.  However, this item should be verifi ed 
at the time of start up.  This feature will also need to be 
confi gured if a replacement control board is installed.

The unit can be placed in the occupied or unoccupied 
mode by four different methods.

•

  Digital Input  - A switch, external time clock, etc. 

can be used to close a 24 volt AC circuit between 
the “R” and “OCC” connection on the fi eld con-
nection terminal block of the Simplicity control 
board.  When the circuit is closed, the unit is in 
the Occupied mode.  If the circuit is open, the 
unit is in the unoccupied mode.  In order to use 
this feature “OCCUPIED INPUT ENABLED” 
must be enabled using Parameter 71 under the 
PROGRAM key on the Simplicity control board 
or under the SYSTEMS OPTIONS tab in the 
Simplicity PC software package.

•

  Internal Schedule – The Simplicity Control can 

be programmed for a weekly schedule that al-
lows two occupied and two unoccupied times 
for each day.  The control can also be confi gured 
for up to 20 Holiday schedules.  The start date, 
time, and number of days can be programmed in 
for each holiday.    The weekly schedule can be 
programmed using the WEEKLY SCHEDULE 
SETTINGS tab in the Simplicity PC software 
package.  The holiday schedule can be pro-
grammed using the HOLIDAY SCHEDULE 
tab in the Simplicity PC software package.  In 
order to use this feature “OCCUPIED INPUT 
ENABLED” must be disabled using Parameter 
71 under the PROGRAM key on the Simplicity 
control board or under the SYSTEMS OPTIONS 
tab in the Simplicity PC software package.

•

 An 

“Occupancy Command” can be entered into 

the Simplicity Control using the Modbus com-
munication feature.  In order to use this feature 
“OCCUPIED INPUT ENABLED” must be en-
abled using Parameter 71 under the PROGRAM 
key on the Simplicity control board or under the 
SYSTEMS OPTIONS tab in the Simplicity PC 
software package.  

•

 Space 

Sensor 

with 

Unoccupied 

Override 

Button 

– If the Override Button is pushed on the space 
sensor the control will switch to the Occupied 
mode until the Unoccupied Override Time has 
expired.  The Unoccupied Override Time can be 
set between 0 and 240 minutes.  The “UNOCCU-
PIED OVERRIDE TIME” can be programmed 
by selecting Parameter 9 using the Simplicity 
control board PROGRAM key or by using the 
SYSTEMS OPTION tab in the Simplicity PC 
software package.

A Constant Volume (CV) unit can be controlled by four 
methods:

•

 Stage 

thermostat

•

 Communicated 

Space 

Temperature

•

 Hardwired 

Space 

Temperature

•

 Stand 

Alone

The control is self-confi guring based on the inputs that 
are present.  The controls means are listed in their order 
of priority.  If the Simplicity Control sees a thermostat 
input it will respond to that input regardless of the status 
of the Space Temperature input.  This feature allows 
the Service Technician to easily energize a cooling or 
heating function for troubleshooting regardless of a 
space temperature input.  

As long as the Simplicity Control is receiving a space 
temperature input from the BAS system, it will use 
the communicated value instead of a hard wired space 
temperature input.

The following parameters must be programmed to allow 
cooling and/or heating operation: