JOHNSON CONTROLS
77
SECTION 5 – SEQUENCE OF OPERATION
FORM 100.50-NOM6
ISSUE DATE: 8/07/2017
5
P1
P2
P1
P2
FIGURE 31 -
CONDENSER FAN VFD
POTENTIOMETER SETTINGS
LD113008
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 con-
trol 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 con-
trol 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 con-
trol 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 con-
trol 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 control ter-
minal board and the “
COOL, FAN ON DELAY”
or
“HEAT, FAN ON DELAY”
have timed out. The
“HEAT, FAN ON DELAY”
timer does not start un-
til the control receives a signal that the gas valve
is energized.
•
There is a call for cooling or heating operation ini-
tiated 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 sig-
nal that the gas valve is energized.
•
If “
CONTINUOUS FAN OPERATION WITH
SENSOR”
is turned ON using Parameter 55 un-
der 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 con-
trol board or under the FANS tab in the Simplic-
ity 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 de-energized when the supply
fan has been ON for 30 seconds and anyone of the fol-
lowing occurs:
•
When the 24-volt input to terminal “G” of the
Simplicity control terminal board is removed.
•
Any time the 24 volt input to terminal Y1, Y2,
Y3, Y4, W1, W2, or W3 of the Simplicity 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 sig-
nal that the gas valve is de-energized.
•
Any time there is a call for cooling or heating op-
eration 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 sig-
nal that the gas valve is energized.
•
When the unit goes into the unoccupied mode and
there is no call for cooling or heating operation.
The Simplicity Control monitors the operation of the
supply fan by checking the status of a digital input
from an air proving switch. After 90 seconds of opera-
tion, the Simplicity Control looks for a high state (24-
volt input) from the air proving switch circuit at the
“APS”
connections at the P11 connector on the Sim-
plicity control board. If this input does not go to the
high state in this time frame the Simplicity Control will
