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Thread: Carrier VVT

  1. #1
    Join Date
    Feb 2007
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    Carrier VVT

    I service a Medical Bld. that has a VVT system 30 ton Compressor for cooling and a boiler for heating. My question is the unit shut down on a SE 11 ERROR on the Monitor stat I checked the book and its said its a temp. high limit which mean after 10 mins if the supply duct temp. does not drop below 55 F the unit will shutdown. I Ohmed out the supply duct sensor and got a reading of 19 Mega ohms which I though was real high. I checked on the Monitor stat for that sensor Catagory 5 option 5 it showed FAILED does this mean that the sensor is bad or does it need to be recalibrated

  2. #2
    Join Date
    Mar 2005
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    I would try to recalibrate sensor at first. On general, these sensors require recalibration every couple of years.

  3. #3
    Join Date
    Dec 2006
    Washington, DC
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    The SE11 alarm is a Temperature Limit Alarm. If option 4.4 is ON, you will get this alarm if temperature exceeds the settings in 4.5/4.6/4.7/4.8. I would check these settings & see why you exceeded them.

    Heating Mode An alarm is issued when any supply air
    sensor in the system is above the first or second stage
    heating temperature limit (depending on which stages are
    Cooling Mode An alarm is issued when any supply air
    sensor in the system is below the first or second stage
    cooling temperature limit (depending on which stages are

    Heat/Cool Mode Alarms are cleared from the system in two ways:
    Cycle power to the thermostat OFF, then ON.
    Reset the Unit Thermostat. Initiate a reset by switching
    the Unit Reset to the ON (Category 7, Option 11).

    The 10 minute timeframe on temperatures is not the same thing. This is the Cool/Heat Error Setpoints in Options 7.9/7.10. If these settings are not reached within 10 min, you will get an alarm of SE07 or SE08. The defaults for these are 0F and 140F, in all my years I have never seen anyone change these. I never do to prevent unnecessary alarms.

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