York YPAL 061, YPAL 050 Heating Mode Enabled for Operation, Thermostat Input, Occupied Cooling

Sequence of Operation

“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.

Thermostat Input

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.

The unit uses tandem compressors, two compressors for System 1 and two compressors for System 2.

FORM 100.50-NOM6 (1207)

Occupied Cooling

•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

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 field connection terminal block and Y2 from the thermostat to Y3 and Y4 on the Simplicity field 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.

64 JOHNSON CONTROLS