Sequence of Operation
“Economizer Minimum Position” Alarm
•The supply air temperature must be above the
“SUPPLY AIR TEMP ALARM SETPOINT FOR COOLING” set point and the following sequence of events have occurred:
–All the stages of cooling must have been on for 10 or more minutes.
–The outdoor air is 20.0° F or more warmer then the “SUPPLY AIR TEMP ALARM SETPOINT FOR COOLING” 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 below the
“SUPPLY AIR TEMP ALARM SETPOINT FOR COOLING”, the control will keep the outdoor damper closed and complete the cool- ing cycle.
∗The Simplicity Elite control will declare an
“ECONOMIZER MINIMUM POSITION” alarm and flash an Alarm Code 40.
–If the supply air temperature is not below the
“SUPPLY AIR TEMP ALARM SETPOINT FOR COOLING”.
∗The Simplicity Elite control will declare a
“SUPPLY AIR TEMP ALARM SETPOINT FOR COOLING” alarm and flash an Alarm Code 38.
–After the cooling 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.
FORM
ALARM HISTORY
The last five alarms can be view on the Simplicity Elite control board as follows. The sequence below gives the alarms from the most recent to the oldest.
Alarm 1 – The most recent alarm can be viewed under Parameter 72 using the PROGRAM key on the Simplicity Elite control board.
Alarm 2 – The next alarm in sequence can be viewed under Parameter 73 using the PROGRAM key on the Simplicity Elite control board.
Alarm 3 - The next alarm in sequence can be viewed under Parameter 74 using the PROGRAM key on the Simplicity Elite control board.
Alarm 4 - The next alarm in sequence can be viewed under Parameter 75 using the PROGRAM key on the Simplicity Elite control board.
Alarm 5 - The next alarm in sequence can be viewed under Parameter 76 using the PROGRAM key on the Simplicity Elite control board.
The above alarms can also be viewed using the ALARMS tab in the Simplicity PC software program.
98 | JOHNSON CONTROLS |
