JOHNSON CONTROLS
39
SECTION 2 – INSTALLATION
FORM 100.50-NOM6
ISSUE DATE: 8/07/2017
2
The thermostat should be mounted on an inside wall
approximately 56” above the floor where it will not be
subject to drafts, sun exposure or heat from electrical
fixtures or appliances.
Note that 24VAC terminal (R) on terminal block P1
of the Simplicity control board must be used as the
24VAC source for the input to the thermostat. Use of
any power source external to the controller will result
in damage to the Unit Controller.
Fan Input
By closing a contact between terminal (R) and (G) on
terminal block P1 on the Simplicity control board the
supply fan can be turned ON. This function is typically
used on CV units and is included with most room ther-
mostats.
Note that 24VAC terminal (R) on terminal block P1
of the Simplicity control board must be used as the
24VAC source for the input to (G). Use of any power
source external to the controller will result in damage
to the Unit Controller.
Space Sensor
A space sensor can be used in lieu of a thermostat as
the primary means of control on a CV unit. The space
sensor is connected to terminals (ST) and (GND) of
terminal block P8 on the Simplicity control board.
A space sensor with a 20,000 potentiometer can be
used to reset the space temperature setpoint. The space
temperature reset is connected to terminals (SSO) and
(GND) of terminal P8 on the Simplicity control board.
When mounting a space sensor, it should be located
on an inside wall approximately 56” above the floor
where it will not be subject to drafts, sun exposure, or
heat from electrical fixtures or appliances.
Shielded wire must be used that is ground-
ed at the control panel only.
CO
2
Sensor
The addition of a field installed CO
2
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 10VDC. 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 ter-
minal 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 pro-
vided 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 24VAC terminal (R) on terminal block P1
of the Simplicity control board must be used as the
24VAC source for the input to (OCC). Use of any pow-
er source external to the controller will result in dam-
age 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 24VAC
power to the Unit Controller.
Closed Circuit – Normal Operation
Open Circuit – Shutdown
Note that 24VAC terminal (R) on terminal block P1
of the Simplicity control board must be used as the
24VAC 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
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