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85
JOHNSON CONTROLS
FORM 100.50-NOM6 (1207)
5
SPACE SENSOR FAULT OVERRIDE ENABLE
The Unit Controller will self confi gure when it identifi es
a space sensor has been installed. Once it identifi es that
a space sensor is connected, if the input is then removed
the control will generate a Space Temperature Sensor
Alarm (19). When this occurs the unit will continue to
operate and will use the return air temperature input
in place of the space sensor. If the “SPACE SENSOR
FAULT OVERRIDE ENABLE” is turned on, the Alarm
is removed and the unit will continue to use the return
air temperature input until the space sensor input is
within range and “SPACE SENSOR FAULT OVERRIDE
ENABLE” has been turned off.
“SPACE SENSOR FAULT OVERRIDE ENABLE”
is enabled using parameter 8 under the PROGRAM
key of the Simplicity Elite control board or under the
SYSTEMS OPTIONS tab of the Simplicity software
package.
Sequence of Operation
When the unit is confi gured as a Constant Volume unit
with space sensor the Simplicity Control will use the
same logic for controlling compressors, economizer,
and heating that it would use with a space sensor but
uses the return air temperature input instead of the
space sensor.
When unit is confi gured for VAV with space sensor,
the Simplicity Elite control will use the return air
temperature in place of the space sensor to reset between
the “VAV COOLING SUPPLY AIR TEMP UPPER
SETPOINT” and the “VAV COOLING SUPPLY AIR
TEMP LOWER SETPOINT” based on the return air
temperature in relation to the “VAV SUPPLY AIR TEMP
RESET SETPOINT”.
REMOTE CONTROL
This feature can be used on a VAV unit to send a
hardwired 0 to 10 volts signal to the unit to vary the
supply air temperature set point between the “VAV
COOLING SUPPLY AIR TEMP LOWER SETPOINT”
and “VAV COOLING SUPPLY AIR TEMP UPPER
SETPOINT”. This feature will only work on a VAV
unit with space sensor control.
The following parameter must be enabled in order to
use to feature:
“REMOTE CONTROL INPUT ENABLE FOR THIRD
PARTY BAS” must be enabled using Parameter 22 under
the PROGRAM key of the Simplicity Elite control board
or under the SYSTEMS OPTIONS tab of the Simplicity
PC software package.
Sequence of Operation
The Simplicity Elite control will vary the active cooling
set point per the following:
• Reset voltage less than 1.5 volts DC – No com-
pressor operation.
• Reset voltage 1.5 to 2.0 volts DC - “VAV
COOLING SUPPLY AIR TEMP LOWER
SETPOINT”.
• Reset voltage 10.0 volts DC - “VAV COOLING
SUPPLY AIR TEMP UPPER SETPOINT”.
• Reset voltage between 2.0 and 10.0 volts DC
– linearly between the “VAV COOLING SUP-
PLY AIR TEMP LOWER SETPOINT” and
“VAV COOLING SUPPLY AIR TEMP UPPER
SETPOINT”.
• The hard wired input is connected to the Sim-
plicity Elite control board at the “REM+” and
“REM-“ terminals of the P19 connector.
REDLINE
The feature can be used to temporally reduce the
electrical consumption of the unit by reducing the
number of compressor that are turned on. This feature is
only available as a communicated input to the Simplicity
Elite control. The BACnet name is SET_REDLINE and
the BACnet instance number is BV12. For Modbus use
address (HEX) 41L, address (DEC) 65L Bit 0.
Sequence of Operation
If three or more compressors are energized when the
Simplicity Elite control receives this command the
Simplicity Control will turn off compressor number
3 and 4 if energized even if the minimum run time
requirement has not been met.