JOHNSON CONTROLS
163
SECTION 8 – SERVICE
FORM 100.50-NOM6
ISSUE DATE: 8/07/2017
8
Dirty Filter Switch Alarm (23)
This alarm will have no effect on the operation of the
unit. The alarm indicates the dirty filter switch contacts
have closed indicating the pressure drop across the
filters is above the setting of the switch. The 24VAC
output to the switch is at terminal FILT wire 391 of the
P22 connector and the input to the control is at terminal
FILT wire 390 of the P22 connector.
Supply Fan Air Proving Switch (24)
This alarm indicates there was a call for supply fan op-
eration and after 90 seconds of supply fan operation the
switch did not close. The Unit Controller will retry the
fan output every 30 minutes for three retires. If after
the three retries the Unit Controller will lockout heat-
ing and cooling operation.
On a VAV unit the Unit Controller will also use the
duct static pressure input to qualify supply fan opera-
tion. If the Unit Controller reads more than 0.05" WC
it will continue to identify the alarm but allow the unit
to operate.
The 24VAC output to the switch is at terminal APS
wire 412 of the P11 connector and the input to the con-
trol is at terminal APS wire 411 of the P11 connector.
Supply Fan Air Proving Switch Closed Alarm
(25)
This alarm indicates the call for supply fan operation
has been terminated and after 90 seconds of supply fan
operation the switch remained closed. The control will
flash the alarm but allow the unit to operate normally.
The 24VAC output to the switch is at terminal APS
wire 412 of the P11 connector and the input to the con-
trol is at terminal APS wire 411 of the P11 connector.
Microelectronics Failure Alarm (26)
This alarm indicates a problem with the Unit Control-
ler microelectronics has occurred and the Unit Control-
ler is operating on default values. Try recycling power
to the control. If the fault reappears replace the Unit
Controller.
Microelectronics Failure Alarm (27)
This alarm indicates a problem with the Unit Control-
ler microelectronics has occurred and the Unit Control-
ler is shut down. Try recycling power to the control. If
the fault reappears replace the Unit Controller.
Supply Fan Overload Alarm (28)
The Unit Controller monitors this circuit anytime the
supply fan is operative. If this input is lost for 50 mil-
liseconds, the control will shut down all unit operation.
If the voltage input does not return in 5-minutes the
control will turn on the alarm.
If the voltage returns the Unit Controller will log the
first incident and track the run time. If the switch opens
three times in a two-hour period the Unit Controller
will shut down the unit.
The 24VAC output to the switch is at terminal FOVR
wire 404 of the P16 connector and the input to the con-
trol is at terminal FOVR wire 403 of the P16 connector.
Outdoor Humidity Sensor Alarm (29)
This alarm indicates the outdoor humidity sensor is
out of range. When this occurs the Unit Controller will
switch economizer operation to Dry Bulb. The Out-
door Humidity analog input is at OH+ wire 333 of the
P6 connector and OH- wire 334 of the P6 connector. To
troubleshoot the sensor verify 24VAC between termi-
nals EXC and COM of the sensor. Also verify the VDC
between the OUT and COM connection of the sensor.
If no voltage is present replace the sensor.
Return Humidity Sensor Alarm (30)
This alarm indicates the return humidity sensor is out
of range. When this occurs the Unit Controller will
switch economizer operation to Single Enthalpy. The
Return Humidity analog input is at RH+ wire 335 of
the P6 connector and OH- wire 336 of the P6 connec-
tor. To troubleshoot the sensor verify 24VAC between
terminals EXC and COM of the sensor. Also verify the
VDC between the OUT and COM connection of the
sensor. If no voltage is present replace the sensor.
IAQ (CO
2
) Sensor Alarm (31)
This alarm indicates the IAQ (CO
2
) sensor is out of
range. When this occurs the Unit Controller will switch
the ventilation mode from Demand to Fixed Minimum.
The IAQ sensor input is at terminal DV+ and DV-. This
device is field supplied.
Time Clock Error Alarm (32)
This alarm indicates the Unit Controller Real Time
Clock is not functioning. The Unit Controller will shut
down all operation. Try recycling power to the control.
If the fault reappears replace the Unit Controller.
Содержание 050
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