JOHNSON CONTROLS
40
FORM 100.50-NOM6
ISSUE DATE: 8/07/2017
SECTION 2 – INSTALLATION
•
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 24VAC source for switch the
contact to the Unit Controller Smoke Purge (PURGE)
input. Use of any power source external to the control-
ler will result in damage to the Unit Controller.
BAS Economizer Input
The Simplicity control board has the capability to con-
trol the economizer damper through a 2 to 10VDC
input.
Refer to BAS Economizer Input information
contained in Section 5 of the manual for additional in-
formation on the programming and operation of this
feature.
The 2 to 10VDC 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 24VAC output whenever
an alarm is present. It is capable of driving a 25ma load.
This is design to connect to a fault light on a commer-
cial thermostat. This output originates at terminal (X)
at terminal block P1 on the Simplicity control board.
VAV Heat Relay Output
This is a 24VDC output that is turned ON when the
unit is in the heating mode. The field can use this as a
signal to trigger the opening of the VAV boxes for heat-
ing operation. This feature uses two ¼ inch male tabs
identified as (VAV OPEN +) and (VAV OPEN -) on the
Simplicity control board.
Supply Air Temperature Reset
An external 0 to 10VDC input can be applied to termi-
nals (REM+) and (REM-) at terminal block P19 on the
Simplicity control board to reset the supply air tem-
perature setpoint for VAV operation. The units interpret
the voltage input as follows:
•
Below 1.0VDC – the blower is de-energized
•
Below 1.5VDC – the cooling and heating is dis-
abled
•
At 2.0VDC – the control uses the lower setpoint
•
Between 2.0 VDC and 10VDC the change in
setpoint is proportional to the change in voltage.
•
At 10.0VDC – the control uses the upper setpoint
COMMUNICATION
The Simplicity Unit Controller is designed to commu-
nicate using Modbus Client protocol. Through the use
of a ModLINC translator the unit can also communi-
cate using BACnet MS/TP protocol.
Through the use of a FREEnet Serial or USB adapter
the Simplicity Unit Controller can be connected direct-
ly to a computer. Multiple units can be daisy chained
together and through the use of the adapter connected
to a computer or a network. This allows remote moni-
toring of the unit as well as the ability to change set-
tings and options from a remote location.
Connection to the unit is done through either of two
RS-485 connections. The P4 terminal block has screw
connections with terminal A being the – and terminal
B being the +. The P5 connecter is designed to allow
the mating connector from the FREEnet Serial or USB
adapter to be plugged in.
See
DIRTY FILTER SWITCH
On units with a dirty filter switch option, an adjust-
able differential pressure switch is installed to monitor
the pressure drop across the filters. When the pressure
drop across the filters exceeds the setting of the switch,
the switch closes sending a 24-volt signal to the Unit
Controller. The Unit Controller posts a warning in the
service memory buffer; but will not shut down the unit.
POWER WIRING
Field wiring to the unit must conform to provisions of
National Electrical Code (NEC) ANSI / NFPA 70-Lat-
est Edition and / or local ordinances. The unit must
be electrically grounded in accordance with the NEC
and / or local codes. Voltage tolerances, which must be
maintained during starting and running conditions, are
indicated on the unit data plate.
The internal wiring harnesses furnished with this unit
are an integral part of the design certified unit. Field
alteration to comply with electrical codes should not
be required. If any of the wire supplied with the unit
must be replaced, replacement wire must be of the type
shown on the wiring diagram and the same minimum
gauge as the replaced wire.
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