JOHNSON CONTROLS
86
FORM 100.50-NOM6
ISSUE DATE: 8/07/2017
SECTION 5 – SEQUENCE OF OPERATION
•
The Simplicity Control then starts a 3 minute
timer.
•
If after 3 minutes the supply air temperature is
equal to or less than the
“SUPPLY AIR TEMP
LIMIT HEATING SETPOINT”
minus 10.1° F the
Simplicity Control will turn the heat stage back
ON provided there is still a demand for the staged
off heat stage.
•
If after 3 minutes the supply air temperature is
not equal to or less than the
“SUPPLY AIR TEMP
LIMIT HEATING SETPOINT”
minus 10.1° F the
Simplicity Control will keep the heat section off
until the supply air temperature is equal to or less
than the
“SUPPLY AIR TEMP LIMIT HEATING
SETPOINT”
minus 10.1° F. The Simplicity Con-
trol will turn the heat stage back ON provided
there is still a demand for the staged off heat stage.
If multiple heat stages are ON the control will monitor
the supply air temperature and respond as follows:
•
The Simplicity Control will monitor the supply
air temperature and compare it to the
“SUPPLY
AIR TEMP LIMIT HEATING SETPOINT”.
If the
supply air temperature is 0.1° F or more above
this value and the heat stage minimum run time
requirement has been met the Simplicity Control
will turn off the heat section with the shortest run
time.
•
The Simplicity Control starts a 3 minute and
30 second timing sequence. If after 30 seconds
the supply air temperature is still 0.1° F above
the
“SUPPLY AIR TEMP LIMIT HEATING
SETPOINT”
, the control will turn off the next
heat stage with the shortest run time.
•
The Simplicity Control will continue to turn off
heat stages every 30 seconds until the supply air
temperature is equal to or less than the
“SUPPLY
AIR TEMP LIMIT HEATING SETPOINT”.
•
If after 10 minutes the supply air temperature is
equal to or less than the
“SUPPLY AIR TEMP
LIMIT HEATING SETPOINT”
minus 10.1° F the
Simplicity Control will turn the heat stage(s) back
ON provided there is still a demand for the use of
the staged off heat stage.
•
If after 10 minutes the supply air temperature is
still greater than the
“SUPPLY AIR TEMP LIMIT
HEATING SETPOINT”
minus 10.1° F the Sim-
plicity Control will keep the heat stage(s) off un-
til the supply air temperature is equal to or less
than the
“SUPPLY AIR TEMP LIMIT HEATING
SETPOINT”
minus 10.1° F. The Simplicity Con-
trol will turn the heat stage(s) back ON provided
there is still a demand for the staged off heat stage.
SPACE SENSOR WITH SETPOINT ADJUSTMENT
A space sensor with a 20 K ohm slide potentiometer
can be used to reset the Occupied Cooling and Heating
setpoints.
In addition to the use of a space sensor with the slide
potentiometer
“SPACE TEMPERATURE OFFSET
RANGE”
must be programmed by using Parameter 56
under the PROGRAM key on the Simplicity Elite con-
trol board or under the SYSTEMS OPTIONS tab in the
Simplicity Elite software package.
Sequence of Operation
As the slide potentiometer is moved the Occupied
Cooling and Heating setpoint is changed based on
the programmed
“SPACE TEMPERATURE OFFSET
RANGE”
. The
“SPACE TEMPERATURE OFFSET
RANGE”
can be set from 0 to 5.0° F. For example,
if the “
SPACE TEMPERATURE OFFSET RANGE”
is
programmed for 3.0° F and the resistance of the poten-
tiometer is lowered the Cooling and Heating setpoints
would be lowered up to 3.0° F. If the resistance is in-
creased the Cooling and Heating setpoints would be
increased up to 3.0° F.
SPACE SENSOR FAULT OVERRIDE ENABLE
The Unit Controller will self configure when it identi-
fies a space sensor has been installed. Once it identifies
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 con-
tinue to operate and will use the return air temperature
input in place of the space sensor. If the
“SPACE SEN-
SOR 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 OVER-
RIDE 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 SYS-
TEMS OPTIONS tab of the Simplicity software pack-
age.
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