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    papakarl2165's Avatar
    papakarl2165 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Feb 3, 2010, 07:37 AM
    What do the letters M stand for on a heat sequencer?
    On a heat sequencer, marked on each tab is M1,M2, M3, M4. On a blue print, L1 is Line 1, T1 is Terminal 1. What does the "M" stand for?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Feb 3, 2010, 11:48 AM
    M=MAIN CONTACTS: These are the load contacts and are
    identified by the terminals designated “M” or “F”. These
    contacts will always be the first switch to turn ON and the=
    last to turn OFF. Other contacts are random ON, random
    OFF.

    M=MAIN CONTACTS: These are the load contacts and are
    identified by the terminals designated “M”. The M1-M2
    contacts will always be the first set of contacts to close
    and the last set to open. The M3-M4 contacts will always
    be the second set of contacts to close and the second-tolast
    set of contacts to open. The M5-M6 contacts will
    always close last and open first.
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