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JOHNSON CONTROLS
FORM 100.50-NOM6 (1207)
5
“Economizer Minimum Position” Alarm
• The supply air temperature must be below the
“SUPPLY AIR TEMP ALARM SETPOINT FOR
HEATING” set point and the following sequence
of events have occurred:
– All the stages of heating must have been on
for 10 or more minutes.
– The outdoor air is 20.0° F or more cooler then
the “SUPPLY AIR TEMP ALARM SETPOINT
FOR HEATING” set point.
– The economizer must be open more than
20%.
• If the above criteria is met
– The Simplicity Elite control will close the
outdoor damper for ten minutes.
– After ten minutes, the Simplicity Elite control
will read the supply air temperature.
– If the supply air temperature is above the
“SUPPLY AIR TEMP ALARM SETPOINT
FOR HEATING”, the control will keep the
outdoor damper closed and complete the
heating cycle.
∗ The Simplicity Elite control will declare an
“ECONOMIZER MINIMUM POSITION”
Alarm and fl ash an Alarm Code 40.
– If the supply air temperature is not above the
“SUPPLY AIR TEMP ALARM SETPOINT
FOR HEATING”.
∗ The Simplicity Elite control will declare
a “SUPPLY AIR TEMP ALARM FOR
HEATING” Alarm and fl ash an Alarm
Code 39.
– After the heating cycle is completed, the Sim-
plicity Elite control sets the outdoor damper
to its minimum position.
– In order to reset the above alarms power to
the unit must be cycled on and off.
SAT ALARM FOR COOLING
When this feature is turned, on the Simplicity Elite
control monitors the supply air temperature in the
cooling mode and will generate an alarm if the supply air
temperature goes above the set point, and if conditions
are met, modifi es the amount of ventilation air to keep
the supply air temperature below this set point when all
the cooling stages are energized. This feature can only
be used on unit operating in the VAV mode.
In order to use this feature the following parameter must
be programmed:
“SUPPLY AIR TEMP ALARM SETPOINT FOR
COOLING” – must be set under the COOLING SETUP
tab of the Simplicity PC software package.
• If “SUPPLY AIR TEMP ALARM SETPOINT
FOR COOLING” is set to zero this feature is
disabled. If not set to zero, then the setting be-
comes the alarm set point.
• Set “SUPPLY AIR TEMP ALARM SETPOINT
FOR COOLING” to the temperature you want
to use for the alarm set point. The range is 1.0°
F to 80.0° F in 1.0° F increments.
Sequence of Operation
“Supply Air Temp Alarm Setpoint for Cooling”
Alarm
• The control will initiate a “SUPPLY AIR TEMP
ALARM FOR COOLING” and fl ash an Alarm
Code 38 if the following conditions are met:
– All the stages of cooling have been on for 10
or more minutes.
– The supply air temperature is 20 degrees
above the “SUPPLY AIR TEMP ALARM
SETPOINT FOR COOLING” set point for
10 minutes.
– The outdoor air is not 20.0° F or more warmer
then the “SUPPLY AIR TEMP ALARM
SETPOINT FOR COOLING” set point.
– The outdoor air damper is not open more than
20%.
• In order to reset the above alarm power to the
unit must be cycled on and off.