RT-SVX50M-EN
39
Table 16.
FDD troubleshooting
FAULTS
TESTS
Air temp. sensor
failure / fault
Not economizing
when it should
Economizing when it
should not
Damper not
modulating
Excess outdoor
air
Damper Stuck Open
x
x
x
Damper Stuck at Minimum
x
x
Bad or Unplugged Actuator
x
x
x
Sensor Hard Failure
x
x
x
x
Actuator Mechanically
Disconnected
x
x
x
x
Resetting Cooling and Heating
Lockouts
Cooling Failures and Heating Lockouts are reset in an
identical manner.
Method 1 section explains resetting the system from the
space; Method 2 section explains resetting the system at
the unit.
Note:
Before resetting Cooling Failures and Heating
Lockouts check the Failure Status Diagnostics by
the methods previously explained. Diagnostics will
be lost when the power to the unit is disconnected.
Method 1
To reset the system from the space, turn the “Mode”
selection switch at the thermostat to the “Off” position. After
approximately 30 seconds, turn the “Mode” selection switch
to the desired mode, i.e. Heat, Cool or Auto.
Method 2
To reset the system at the unit, cycle the unit power by
turning the disconnect switch “Off” and then “On”.
Condensate Overflow Switch
When the condensate overflow switch is closed, a drain
pan overflow condition is indicated and it will shut unit
operations down.
Unit Economizer Control (ECA)
Verify Economizer Status by Economizer Actuator (ECA)
LED indicator:
•
OFF: No Power or Failure
•
ON: Normal, OK to Economize
•
Slow Flash: Normal, Not OK to Economize
•
Fast Flash - 1/4 Second On / 2 Seconds Off:
–
Error Code: Communications Failure
•
Pulse Flash: 1/30 Second On / 1/4 Second Off: (2
Seconds between pulse sequences)
Error Code
•
1 Flash: Actuator Fault
•
2 Flashes: CO
2
Sensor
•
3 Flashes: RA Humidity Sensor
•
4 Flashes: RA Temp Sensor
•
6 Flashes: OA Humidity Sensor
•
7 Flashes: OA Temp Sensor
•
8 Flashes: MA Temp Sensor
•
9 Flashes: On-board Setpoint Failure
