42
RT-SVX50J-EN
Table 20.
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.
N
No
otte
e:: 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
Содержание Foundation EBC180
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