Troubleshooting; Alarm Issues; Alarm, (False) Fan Fail; Alarm, (False) Low Limit (Freeze Stat) - KMC Controls FlexStat series Operation Manual

Troubleshooting

Alarm Issues

Alarm, (False) Fan Fail

• Check configuration. Be sure the Fan Status
option is not selected when there is no sensor/
switch for it.
• Check that the IN2 (fan status) input pull-up
resistor switches are fully latched in the correct
positions. Any passive, dry contact should use
the 10K Ohm setting. (See the Connections and
Wiring section of the relevant FlexStat Installa-
tion Guide.)
• Check IN2 (fan status) input wiring.
• Check the connected fan status sensor/switch.
• Using BACstage or TotalControl, check that AI2
(fan status) is not configured as "Out Of Service."

Alarm, (False) Low Limit (Freeze Stat)

• Check the Low Limit Alarm setting—see Damper
Setup on page 7.
• Check configuration. Be sure the Economizer
option is not selected when there is no mixed air
temperature sensor.
• Check that the IN3 (mixed air temp.) input
pull-up resistor switches are fully latched in the
correct positions (see the Connections and Wir-
ing section of the relevant FlexStat Installation
Guide).
• Check IN3 (mixed air temperature) input wiring.
• Check the connected mixed air temperature sensor.
• Using BACstage or TotalControl, check that AI3
(mixed air temp.) is not configured as "Out Of
Service."
NOTE: After a low limit alarm is generated, the
fan will not run until after the FlexStat is
restarted. (See Resetting the FlexStat on
page 26.)

Alarm, (False) Space Temp. or Humidity

• See Alarms on page
• See Temperature Reading Is Incorrect on page
• See Temperature Setpoint Is Not Maintained on
page 35.
• Using TotalControl, adjust the limits or time
delay.
FlexStat
23.

Back-Up Issues

NOTE: Backing up the existing settings and
firmware image before or during the
upgrade process (using the Firmware
Upgrade Tool, TotalControl, or BACstage)
is recommended practice.
• See the documentation for the program used to
back-up the FlexStat.
• See service bulletin SB1111A Back-up and
Restore Issues, concerning unconfigured event
enrollment objects and checksum errors on NIC
cards.
• For HTO-1103 FlexStat Firmware Upgrade Kits
received prior to Feb. 7, 2012 that have Rev. D
(on the silver label) of the programming pod, see
service bulletin SB0212A FlexStat Programming
Pod Jumper Position.
• See also Firmware Upgrade Failures on page
34.
30
37.
Operation Guide, Rev. M