JOHNSON CONTROLS
78
FORM 100.50-NOM6
ISSUE DATE: 8/07/2017
SECTION 5 – SEQUENCE OF 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
set an Air Pressure Switch Unit Lockout, Alarm Code
24 and turn off all outputs. The Simplicity Control also
monitors the duct static pressure input during this time.
If the duct static pressure is above 0.05" WC the con-
trol will generate a Air Pressure Switch Unit Lockout,
Alarm Code 24 but continue to operate.
The Simplicity Control will retry the fan output every
30 minutes for three retries. If after three retires it still
cannot qualify the fan, it will continue the alarm and
lock out all heating and cooling operation. If the switch
closes during one of the restarts, the control will re-
sume normal operation and clear the active alarm.
An Air Pressure Switch Unit Lockout will also be de-
clared if the input goes low, for 2 seconds, during nor-
mal supply fan operation.
The Simplicity Control also monitors the supply fan
operation in the off cycle. 90 seconds after the digital
output from the Simplicity Control supply fan circuit
goes low (0 volts) the Simplicity Control checks the
status of the digital input from the air proving switch
circuit. If the state of the circuit remains high (24-volts)
the Simplicity Control will set an Air Pressure Switch
stuck closed, Alarm Code 25. As soon as the pressure
switch opens the Simplicity Control will resume nor-
mal operation.
VAV Supply Fan Speed Control
The following values need to be programmed:
•
“DUCT PRESSURE SETPOINT”
– Using param-
eter 30 under the PROGRAM key on the Simplic-
ity control board or under the FAN tab in the Sim-
plicity PC software package.
•
“DUCT PRESSURE SHUTDOWN SETPOINT”
– By using the FAN tab in the Simplicity PC soft-
ware package.
The Simplicity Control uses a proportional-integral
control algorithm to maintain the
“DUCT PRESSURE
SETPOINT”
by varying the speed of the supply fan. As
the duct static pressure goes up the speed goes down.
set an Air Pressure Switch Unit Lockout, Alarm Code
24 and turn off all outputs.
The Simplicity Control will retry the fan output every
30 minutes for three retries. If after three retires it still
cannot qualify the fan, it will continue the alarm and
lock out all heating and cooling operation. If the switch
closes during one of the restarts, the control will re-
sume normal operation and clear the active alarm.
An Air Pressure Switch Unit Lockout will also be de-
clared if the input goes low, for 2 seconds, during nor-
mal supply fan operation.
The Simplicity Control also monitors the supply fan
operation in the off cycle. 90 seconds after the digital
output from the Simplicity control supply fan circuit
goes low (0 volts) the Simplicity Control checks the
status of the digital input from the air proving switch
circuit. If the state of the circuit remains high (24-volts)
the Simplicity Control will set an Air Pressure Switch
stuck closed, Alarm Code 25. As soon as the pressure
switch opens, the Simplicity Control will resume nor-
mal operation.
On a call for supply fan operation, the Simplicity Con-
trol sends a 24VAC signal from the FAN terminal of
the P13 connector to the supply fan relay.
Variable Air Volume (VAV)
The supply will be energized when the supply fan has
been off for 10 seconds and any one of the following
occurs:
•
The unit is in the occupied mode.
•
The unit is in the Unoccupied heating or cool-
ing mode and there is a 24 volt input to terminal
Y1, Y2, Y3, Y4, W1, W2, or W3 of the Simplic-
ity control 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.
•
Any time the unit goes unoccupied and there is no
call for cooling or heating operation.
•
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.
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