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Warrick Liquid Level Control

Discussion in 'Electronic Repair' started by Peter Easthope, Oct 9, 2013.

  1. The specification label from the inside of the cover of a Warrick liquid level control is visible here.

    http://members.shaw.ca/peasthope/WarrickLevelControl.jpeg

    The power supply and primary coil are 115 V. The secondary coils are 300 V.

    This control switches a well pump which should start when the water level
    reaches the upper probe and stop when the level drops below the lower probe.
    Currently the pump fails to start reliably. The contacts were just cleaned.
    The bar holding the contacts, which should carry current to the pump motor,
    can be visibly displaced. Then there is a hum sound but the motor doesn't start. If the contacts are pushed open and then allowed to recoil shut, the motor starts.

    Questions.

    * Can anyone explain the TYPE notation? "TYPE 1C1D1" in this case.
    A 1C1D0 appeared on eBay recently.

    * Can anyone explain the FORM notation? "FORM 49" in this case.

    * Listings of similar Warrick controls on eBay have secondary voltages ranging
    from 15 V to 500 V. What are the criteria for choosing the secondary voltage?
    My best guess is that lower voltages might work in salt water and higher
    voltages might be necessary in distilled water. Is this topic documented?

    * How is the hum sound generated? Presumeably it can exist when the motor is
    running but be masked by the loud motor sound. Will a new control make the
    same sound?

    * With the relay assembled, the end of the contact holding bar is visible
    but the contacts are not visible. Given that the contacts are clean, how
    can the contact holder be displaced without delivering sufficient power
    to run the motor?

    * What is meant by "PILOT DUTY" on the label?

    Thanks for replies, ... Peter E.
     
  2. N_Cook

    N_Cook Guest

    Does pilot duty relate to a second, preliminary pump, for clearing air
    from the system , priming, before the main pump will cut in?
    A submersible pump would not require priming unless an air/gaseous block
    gets in there
     
  3. In this case there is only one pump.
    The pump is located at the well head. To my understanding it is a shallow well jet pump as described here.
    http://en.wikipedia.org/wiki/Eductor-jet_pump#Well_pumps

    Thanks for the reply, ... Peter E.
     
  4.  
  5. bud--

    bud-- Guest

    My guess is this is the Warrick model number.
    Likely specific to Warrick.
    Relays can hum when they are energized. If powered by 50/60Hz the
    varying current can make the relay armature vibrate, particularly if the
    armature does not seat tightly.
    Pilot duty is using the contacts for low current control. Some contacts
    are rated only for pilot duty - maybe controlling an external relay or
    contactor. In this case pilot duty is using the contacts for low current
    application and the voltage can be much higher.
     
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