JOHNSON CONTROLS
97
SECTION 5 – SEQUENCE OF OPERATION
FORM 100.50-NOM6
ISSUE DATE: 8/07/2017
5
All VAV units have a hot gas valve installed in the
number 1 compressor system. Hot gas is optional on
CV units. If the lead/lag option is enabled the Simplic-
ity Elite control needs to know the hot gas option is
installed. This is done through the following program-
ming parameter.
“HOT GAS BY PASS PRESENT ON COMPRESSOR #
1”
- must be turned ON using Parameter 79 under the
PROGRAM key on the Simplicity Elite control board
or under the COOLING SETUP tab of the Simplicity
PC software.
SPACE TEMPERATURE ALARM
When this feature is enabled, the Simplicity Elite con-
trol monitors the space temperature. When the space
temperature continues to trend above or below the pro-
grammed setpoint and the programmed time has ex-
pired, the Simplicity Elite control will declare a Space
Temperature Alarm.
The following parameters must be programmed:
•
“SPACE TEMP TRENDING ALARM TEMP”
-
must be programmed under SYSTEM OPTIONS
tab of the Simplicity PC software package.
•
“SPACE TEMP TRENDING ALARM TIME”
-
must be programmed under SYSTEM OPTIONS
tab of the Simplicity PC software package.
Sequence of Operation
On Space Temperature Alarm the following applies:
•
To enable this feature
“SPACE TEMP TREND-
ING ALARM TEMP”
must be set at other than
zero.
•
Set
“SPACE TEMP TRENDING ALARM TEMP”
to the number of degrees above or below the space
temperature that you want temperature trending to
begin. The range is 1.0° F to 25.0° F in 1.0° F
increments.
•
Set “
SPACE TEMP TRENDING ALARM TIME”
to the amount of time the space temperature must
be trending above or below the
“SPACE TEMP
TRENDING ALARM TEMP”
before a Space
Temperature Alarm will be initiated. The range is
1 to 120 minutes in 1 minute increments.
•
The unit must have been in a given operating
mode for 10 minutes before trending will begin.
•
Every time the trend moves towards the space
temperature setpoint the
“SPACE TEMP TREND-
ING ALARM TIME”
will reset to zero
•
When the temperature is above or below the
“SPACE TEMP TRENDING ALARM TEMP”
and the trend continues to be away from the space
temperature and the
“SPACE TEMP TRENDING
ALARM TIME”
has expired, the Simplicity Elite
control will declare a
“SPACE TEMPERATURE”
Alarm. The Simplicity Elite control will flash an
Alarm Code 41.
•
The Simplicity Elite control will continue normal
operation while in this fault mode.
•
The Simplicity Elite control will continue to show
the fault until the space temperature is less than
the
“SPACE TEMP TRENDING ALARM TEMP”.
To disable this feature set both the “SPACE TEMP
TRENDING ALARM TEMP” and “SPACE TEMP
TRENDING ALARM TIME” both to 0.
SAT ALARM FOR HEATING
When this feature is turned ON, the Simplicity Elite
control monitors the supply air temperature in the heat-
ing mode and will generate an alarm if the supply air
temperature goes below the setpoint, and if conditions
are met, modifies the amount of ventilation air to keep
the supply air temperature above this setpoint when all
the heating stages are energized. This feature can only
be used on unit operating in the VAV mode.
In order to use this feature
“SUPPLY AIR TEMP
ALARM SETPOINT FOR HEATING”
must be pro-
grammed under the HEATING SETUP tab of the Sim-
plicity PC software package. In addition, the following
applies:
•
If
“SUPPLY AIR TEMP ALARM SETPOINT FOR
HEATING”
is set to zero this feature is disabled.
If not set to zero, then the setting becomes the
alarm setpoint.
•
Set
“SUPPLY AIR TEMP ALARM SETPOINT
FOR HEATING”
to the temperature you want to
use for the Alarm setpoint. The range is 1.0° F to
120.0° F in 1.0° F increments.
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