Sequence of Operation
Cooling – Unoccupied Stand Alone
The Simplicity Control cannot operate unoccupied cooling with this method of control.
Heating – Occupied Stand Alone
The following parameters must be programmed into the Simplicity Control:
•“VAV OCCUPIED HEATING ENABLED”
– This must be turned on using Parameter 26 under the PROGRAM key on the Simplicity control board or under the HEATING SETUP tab in the Simplicity PC software package.
•“MORNING
•“VAV OCCUPIED HEATING SETPOINT” – us- ing Parameter 27 under the PROGRAM key on the Simplicity control board or under the HEAT- ING SETUP tab in the Simplicity PC software package.
•“SPACE SENSOR FAULT OVERRIDE EN- ABLED” must be turned on – using Parameter 8 under the PROGRAM key on the Simplicity control board or under the SYSTEMS OPTIONS tab in the Simplicity PC software package.
The unit will initiate Occupied Heating when the following criteria are met:
•The return air temperature is 2.0° F less than the
“VAV OCCUPIED HEATING SETPOINT”.
•The return air temperature is 0.1° F below the
“MORNING WARM UP / VAV RETURN AIR TEMP SETPOINT”.
The “VAV OCCUPIED HEATING SETPOINT” should always be set below the “MORNING WARM UP RAT SETPOINT”.
The unit will terminate Occupied Heating when:
•The return air temperature is equal to the
“MORNING WARM UP RAT SETPOINT”.
FORM
Heating – Unoccupied Stand Alone
The Simplicity Control cannot operate unoccupied heating with this method of control.
CONDENSER FAN OPERATION
A call for the operation of compressor 1A or 1B will close an output at terminal CF1 of the P13 connector. This 24 VAC output energizes the 6M contactor and turns on condenser fan 1. This 24 VAC output is also sent to pressure switch PS3. If the discharge pressure rises above 360 psig the PS3 switch closes and energizes the 7M contactor. The 7M contactor then energizes condenser fan 2. If the discharge pressure decreases below 300 psig the PS3 switch opens and
A call for the operation of compressor 2A or 2B will close an output at terminal CF2 of the P13 connector. This 24 VAC output energizes the 8M contactor and turns on condenser fan 3. This 24 VAC output is also sent to pressure switch PS4. If the discharge pressure rises above 360 psig the PS4 switch closes and energizes the 9M contactor. The 9M contactor then energizes condenser fan 4. If the discharge pressure decreases below 300 psig the PS4 switch opens and
COOLING COMPRESSOR LOCKOUT
This feature prevents operation of mechanical cooling when the outdoor temperature is below this set point.
•“OUTDOORAIRTEMPCOOLINGLOCKOUT” - this parameter can be set using the COOLING SETUP tab in the Simplicity PC software pack- age. This parameter should never be programmed less then 45.0º F
Sequence of Operation
•If the outdoor temperature is 1.0º F below the
“OUTDOOR AIR TEMP COOLING LOCK- OUT” the Simplicity Elite control will prevent compressor operation.
•When the outdoor temperature is 1.0º F above the “OUTDOOR AIR TEMP COOLING LOCK- OUT” compressor operation will be permitted.
72 | JOHNSON CONTROLS |
