TRIAC issue in Honeywell XL10 FCU Controller

Discussion in 'General Electronics Chat' started by ratheepkrk, Apr 12, 2011.

  1. ratheepkrk

    Thread Starter New Member

    Apr 12, 2011
    I am using Honeywell XL10 controller for controlling the Fan Coil Unit
    This controller have a TRIAC to control the open/close function of actuator
    Terminal 1 is using for open, Terminal 2 is using for close and gate is using for common but some controllers both terminal have control voltage(24vac) at the same time so the actuator is not controlling
    can anyone give a suggestion to how can I solve this issue.
  2. roadey_carl

    Senior Member

    Jun 5, 2009
    Dude, I have no Idea what your talking about! What are you trying to do?
  3. R!f@@

    AAC Fanatic!

    Apr 2, 2009

    Triac controlling the actuator rather than the fan...are u sure?
    The other things u are saying just get's too confusing.

    If you can show the device than do it, other wise explain things properly.
  4. JoeFromOzarks

    Active Member

    Apr 14, 2010
    It appears the traics are used to control actuators. :)

    Room temperature controller for pressure (in)dependent, single/dual duct, VAV units, with built in Microbridge air flow sensor.
    For damper for cool air, re-heat peripheral re-heat and fan.
    The XL10 controllers support 8 triac outputs. (The maximum load for all triacs together is 400mA.)

    Fan output signal 1 triac configurable for on/off or PWM

    Re-heat output signal 1..3 triacs configurable for 3-pt, PWM or single/multistage control

    Damper output signal 2 triacs for 3-pt control

    Auxiliary output signal 1..3 triacs for up to 2 maintained outputs (1 triac each) or up to 1 maintained (1 triac) + pulsed output (2 triacs)
    Control functions cooling only, heat/cool change over, cooling/reheat seq. with constant or modulating reheat airflow, cooling /radiator heating seq. with minimum heat, dual duct, dual duct mixed flow; cooling reheat radiator sequence, series/parallel fan, modulating fan

    Control functions with 2 controllers dual duct constant volume, dual duct mixed flow, dual duct no flow mixing

    Modes of operations occupied, standby, unoccupied, open window, fan fail, summer/winter change over, night purge, morning warm up, smoke purge

    Obligatory inputs • 1 analogue input for room temperature sensor NTC20k; or apply additional XL10-module with built in sensor on dedicated input terminals
    • airflow

    Optional inputs • XL10 wall module input (T7460, T7560-series) with temperature sensor and other functions
    • network input for temperature sensor, setpoint adjustment, bypass and other functions
    • 1 analogue input for discharge temperature or supply temperature sensor NTC20k
    • 3 digital inputs configurable for: window or heat/cool change over or occupancy or status alarm

    Stand-alone operation yes
    Network operation yes
    Bus system LonWorks(R)
    LonMark(R) profile 8010
    Power supply 24 Vac | 10 VA
    Additional description Load per triac 24V~, 25..400mA. The maximum load for all triacs together is 400mA.

    :) joe
  5. ratheepkrk

    Thread Starter New Member

    Apr 12, 2011
    Then why i was getting 24vac on both cooling control triacs at the same time so the actuator is not controlling
  6. JoeFromOzarks

    Active Member

    Apr 14, 2010
    The Honeywell XL10 allows programming the outputs for a specific application. I did not study the programming guide in depth, and I’m not sure which exact Honeywell XL10 you have, but it appears both cooling contactors (triac outputs) can be energized at the same time, if desired.

    I have too many questions, most involve the programming. But for the sake of simplicity, were you able to meter (oscilloscope) the triac gates? What is the part number of the output triacs?

    We know either A1 (MT1) or A2 (MT2) connects to the A/C supply, the other connects to the load. We need to know what the gate is doing. If the logic is instructing both cooling triacs to be on simultaneously, it’s not a fault - but a feature.

    :) joe