York YPAL 051 manual CO2 Sensor, Occupied / Unoccupied Input, Shutdown Input, Smoke Purge Input

Installation

CO2 Sensor

The addition of a field installed CO2 sensor is required for Demand Ventilation operation. The default input span for the control is 0 to 2,000 ppm with an output voltage range of 0 to 10 VDC. The field will need to supply an external power supply for the sensor. This is in addition to the two wires connect to the unit. The sensor connects to terminals (DV+) and (DV-) of terminal block P20 on the Simplicity control board. The wiring to the sensor should be a twisted shield pair grounded on one end.

Occupied / Unoccupied Input

A contact closure input to terminal (OCC) of the P1 terminal block on the Simplicity control board is provided for hard-wiring an external device such as a central time clock, a thermostat with scheduling, or a manual switch to switch the unit from Unoccupied to Occupied mode.

Closed Circuit – Occupied

Open Circuit – Unoccupied

Note that 24 VAC terminal (R) on terminal block P1 of the Simplicity control board must be used as the 24 VAC source for the input to (OCC). Use of any power source external to the controller will result in damage to the Unit Controller.

Shutdown Input

A jumper is installed between terminal “R” and “SD1” on the Simplicity control board. To install a hard-wired shutdown circuit, remove the jumper between the two terminals and connect a switch between the terminals. The switch must be closed for operation and open for shutdown. Opening the switch removes the 24 VAC power to the Unit Controller.

Closed Circuit – Normal Operation

Open Circuit – Shutdown

Note that 24 VAC terminal (R) on terminal block P1 of the Simplicity control board must be used as the 24 VAC source for the input to (SD). Use of any power source external to the controller will result in damage to the Unit Controller.

FORM 100.50-NOM6 (1207)

Smoke Purge Input

A contact closure input (PURGE) is provided to place the unit in smoke purge mode. When the contact is closed the unit will operate as follows:

•Turn off all heating and cooling operation

•Set the outdoor air damper output to 100%

•Close the return to 0%

•Turn the supply fan on

•On VAV units set the supply fan output to 100%

•Turn the power exhaust fan on

•On VFD driven exhaust fans set the exhaust fan output to 100%

Note that 24 volts terminal (R) on the Simplicity control board must be used as the 24 Volt AC source for switch the contact to the Unit Controller Smoke Purge (PURGE) input. Use of any power source external to the controller will result in damage to the Unit Controller.

BAS Economizer Input

The Simplicity control board has the capability to control the economizer damper through a 2 – 10 Volt DC input. Refer to BAS Economizer Input information contained in Section 5 of the manual for additional information on the programming and operation of this feature.

The 2 to 10 VDC input connects to terminals (BAS ECON +) and (BAS ECON –) at terminal block P3 of the Simplicity control board

Fault Output

The Simplicity control board has the capability out sending a positive half wave 24 VAC output whenever an alarm is present. It is capable of driving a 25 ma load. This is design to connect to a fault light on a commercial thermostat. This output originates at terminal (X) at terminal block P1 on the Simplicity control board.

34 JOHNSON CONTROLS