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.
FORM
•If after 10 minutes the supply air temperature is still greater than the “SUPPLY AIR TEMP LIMIT HEATING SETPOINT” minus 10.1° F the Simplicity Control will keep the heat stage(s) 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(s) back on provided there is still a demand for the staged off heat stage.
SPACE SENSOR WITH SET POINT ADJUSTMENT
A space sensor with a 20 K ohm slide potentiometer can be used to reset the Occupied Cooling and Heating set points.
In addition to the use of a space sensor with the slide potentiometer the following parameter must be programmed:
“SPACE TEMPERATURE OFFSET RANGE” – The offset range must be programmed using Parameter 56 under the PROGRAM key on the Simplicity Elite control 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 set point 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 potentiometer is lowered the Cooling and Heating set points would be lowered up to 3.0° F. If the resistance is increased the Cooling and Heating set points would be increased up to 3.0° F.
84 | JOHNSON CONTROLS |
