Sequence of Operation
SUPPLY FAN OPERATION
Constant Volume (CV)
The following values need to be programmed:
“COOL, FAN ON DELAY” – Using parameter 4 under the PROGRAM key on the Simplicity control board or under the FAN tab in the Simplicity PC software package.
“COOL, FAN OFF DELAY” – Using parameter 5 under the PROGRAM key on the Simplicity control board or under the FAN tab in the Simplicity PC software package.
“HEAT, FAN ON DELAY” – Using parameter 2 under the PROGRAM key on the Simplicity control board or under the FAN tab in the Simplicity PC software package.
“HEAT, FAN OFF DELAY” – Using parameter 3 under the PROGRAM key on the Simplicity control board or under the FAN tab in the Simplicity PC software package.
The supply will be energized when:
•The supply fan has been off for 10 seconds and anyone of the following occurs:
–There is a 24 volt input to terminal “G” of the Simplicity control terminal board.
–There is a 24 volt input to terminal Y1, Y2, Y3, Y4, W1, W2, or W3 of the Simplicity con- trol terminal board and the “COOL, FAN ON DELAY” or “HEAT, FAN ON DELAY” have timed out. The “HEAT, FAN ON DELAY” timer does not start until the control receives a signal that the gas valve is energized.
–There is a call for cooling or heating operation initiated by a space sensor demand and the “COOL, FAN ON DELAY” or “HEAT, FAN ON DELAY” have timed out. The “HEAT, FAN ON DELAY” timer does not start until the control receives a signal that the gas valve is energized.
FORM
–If “CONTINUOUS FAN OPERATION WITH SENSOR” is turned on using Parameter 55 under the PROGRAM key on the Simplicity control board, or under the FANS tab in the Simplicity PC software package the supply fan will operate continuously whenever the unit is in the occupied mode.
∗If “TURN OFF CONTINUOUS FAN WHEN START HEAT” is turned on using Parameter 7 under the PROGRAM key of the Simplicity control board or under the FANS tab in the Simplicity PC software package the supply fan will shut down on a call for heat and then start based on the “HEAT, FAN ON DELAY” programmed time.
The supply fan will be
•The supply fan has been on for 30 seconds and anyone of the following occurs:
–When the
–Any time the 24 volt input to terminal Y1, Y2, Y3, Y4, W1, W2, or W3 of the Simplic- ity control terminal board is removed and the “COOL, FAN OFF DELAY” or “HEAT, FAN OFF DELAY” have timed out. The “HEAT, FAN OFF DELAY” timer does not start until the control receives a signal that the gas valve is
–Any time there is a call for cooling or heating operation by a space sensor is lost and the “COOL, FAN OFF DELAY” or “HEAT, FAN OFF DELAY” have timed out. The “HEAT, FAN OFF DELAY” timer does not start until the control receives a signal that the gas valve is energized.
–When the unit goes into the unoccupied mode and there is no call for cooling or heating operation.
74 | JOHNSON CONTROLS |
