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34
JOHNSON CONTROLS
FORM 100.50-NOM6 (1207)
Installation
CO2 Sensor
The addition of a fi eld 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 fi eld 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.
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.