White-Rodgers F801-0173
Cell Contact Pad Rear for White-Rodgers Cells
No Longer Available

  Front Rear

Front Cell Contact kit for all 5" wide cells. Used in models SST, UST, SCS, SSC, FSC, PWM, SRP, SC, SS, cells. Kit includes the phenolic insulator, contact plunger, spring, spring retainer cup, two rivets and washers.

Phenolic insulator measures 2½ x 1½ x 1 inch and distance between mounting holes 1-7/8 inch.

These contacts do not need special cleaning, the high voltage and minimal current makes these contacts not sensitive to conductance problems.

This contact could get burnt due to a gap between the cells. This could be the result of the cell being out of square, or the cabinet frame. If this contact is severely burnt, then the problem could be caused by excessive sparking elsewhere on the cell or the other cell.

Rear Cell Contact Pad Installation

Rear cell Contact padReplacing the cell contact pad is difficult. The factory installed rivets are solid and hard to drill out. Getting the drill started in the center of the rivet is best done with a spring-loaded center punch. The dome on the rivet will cause the drill bit to slide to the side.

After drilling half way through, the rivet will loosen and start to spin. Using a Dremel die grinder may work best by removing the head of the rivet.

Carefull not to allow metal filings to get into the cell.

Rear cell Contact pad installation diagram

How to Fix Collector Cell Arcing

If a cell is sparking, determine the sparking area and removed cell to inspect closer. To see the sparking, you may need to look in through the blower compartment. See photo below.

To best see a sparking problem, cut an inspection hole in the duct. An inspection window can also be used to see when to clean.

A cell that is sparking randomly throughout is uncommon but could be caused by a film left behind from washing. If tobacco is not cleaned from a cell it can build up and cause random sparking. Diesel fumes can cause shorting problems and are not easily cleaned. High altitude can make the air cleaner more susceptible to sparking. The collector plates should be cleaned to the bare shiny metal (stained is okay).

We have seen continuous sparking (month+) burn away the high voltage contacts between the cells or at the power box. Most often sparking burnt a hole in the rear cell contact. When one cell sparks it draws a surge of current from the other cell. The surge causes a spark at the contacts between the cells. A cell with a burnt contact may also have a sparking problem elsewhere. A cell plate that that has experienced excessive sparking can become loose. The plates are mounted on rods and the surges cause sparking to erode the plate around the rod. Check for loose plates.

View of the Collector Cells through the blower compartmentIf a cell is shorted and keeps the LED indicator from coming on, then inspect for damage. A dent across several plates causing them to touch would be a simple short to find. A dandling ionizing wire can cause a short.

Here our photo shows the view of the cells through the blower compartment. If necessary use a mirror to locate the continuous sparking.

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