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Bosch Building Technologies

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    How to Diagnose Dirty Chamber on DS7400XI Versions 3 & 4 panels


    Why would the keypad display "Dirty Chamber" on the keypad for the DS7400Series panel?


    A multiplex smoke detector has failed its internal sensitivity test. 

    a) The smoke may not be calibrated.

    b)  May have a duplicated address

    1. Clean or replace the dirty smoke detector or chamber. (Do not use water)
    2. Plug a TC2000 or D1005 Test Cable (optional) into the calibration voltage pinsConnect a digital voltmeter to the TC2000 or D1005Test Cable. Connect theconnect the positive terminal of the meter to the test cable’s red wire.- The voltage measured by the voltmeter equals 1/2 the sensitivity- Multiply the voltage by 2. The result should be within the factoryof the detector.should be removed and cleaned or replaced as described in Section- Recheck the calibration voltage measurement.after cleaning, send the unit back to Bosch for
    3. Need to check the address of the modules re-calibration. - If the detector is still outside of the factory marked calibration range 5.0 Maintenance on page 3. If the detector is outside of the factory marked calibration range, it marked calibration range printed on the label attached to the bottom (in %/ft obscuration) of the Smoke Head. The white wire of the TC2000 or D1005 is not used. negative terminal of the meter to the black wire of the TC2000 / or D1005  and (see Figure 4).








    Part numbers DS7400XIVER3+, DS7400XIVER4, MX250, MX250TH, MXB2W, MX280. D7050-B6, D7050, D7050TH

    Version history
    Revision #:
    3 of 3
    Last update:
    ‎06-28-2018 04:37 PM
    Updated by: