How does the HRV and ERV work? What is the difference between HRV and ERV? What size HRV or ERV do I need? Is it possible to see outside temperature and humidity on my thermostat? Test button assembly, mounts in the F50 F58 F300 door 203306AB and 203305AB. Also used in the F300E door 32007528-002 and 32007528-003. Note F300 models built 2000 through 2005 came with a plastic door. These plastic doors do not support a test button 32004876-003 and 32004876-004. Cell Repair Tech Note Power Supply Bench Test Here is our procedure to test the power supply. Warning high voltage shock can cause death. The power supply has the option to disable the air flow sensor (see bypass AFS section). The AFS can be temporary disabled for testing by borrowing jumper from J8 to connection J3 position marked "bypass AFS". This power supply does not require the air flow sensor to operate. The photo below shows an older power supply that just needs 120v to power a cell.

Connect 120 vac to terminals P1 and P2. Check the following outputs with respect to chassis ground. Terminal P3 will output 8.2k vdc Terminal P4 will be 4.2k vdc Terminal for the neon lamp outputs 100 vdcFry'S Dell Laptop Charger Since high voltage meters are not common, Honeywell provides the neon lamp as reliable voltage indicator. How To Get Hp Laptop Off Airplane ModeIf the high voltage output falls below spec the neon lamp voltage will drop out.Toilet Seat Hinges Bemis Shorting P3 or P4 to ground has the same effect as the test button. The short will temporarily cause the neon indicator to go out. By tapping P4 to ground you should be able to draw an arc 1/32". Tapping P3 to ground can produce a larger arc near 3/16".

These tests are with out the cells connected, the arc will be twice the length with cells connected. Spark Test Tech Note Air Flow Sensor Bypass 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 or cut an inspection hole in the duct. An inspection window can also be used to see if cells need to be cleaned. 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 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). Major cell sparking can be the result of power box wires getting crossed. The cell is powered by two voltages. The ionizing wires receive 8kv and the plates get 4kv.

If these voltages get crossed, then the cell will spark all over and much louder than normal. If a cell is shorted and keeps the neon lamp from coming on, then inspect for damage. The most common short is from the aluminum dividers in between the ionizing wires. These dividers can get pushed in to the collector plates, they should not touch the plates. A dent across several plates causing them to touch would be a simple short to find. A dandling ionizing wire can cause a short. The 4074EHG tabs make contact with the edge of every other cell plate. Photo right shows the edges of the plates burnt down far enough, that the contact shorts against every plate and not every other. Honeywell cells can last for decades, but continuous sparking can cause damage. A cell may spark continuous if collector plate spacing gets too close. The spacing can become uneven when a cell gets pushed out of square, twisted, a dent, etc. One common problem is a loose plate that has lost the press fit with its horizontal rods.

The loose plate likely had continuous sparking that created surges of current through the press fit. The current surges resulted in sparks that brunt away the press fit. This cell would not be repairable. When one cell has been subject to excessive sparking, then both cells will be burnt under the contact pad. This is because a spark in one cell will cause a current surge that is drawn from both cells. Check the contact pad to determine the condition of the cell. If your cells have badly burnt contacts as in the photo above, then it is best to replace the cells. When a cell has been subjected to excessive sparking, the press fit of all the plates will first be weakened. The sparking at these connections causes corrosion from ozone. The aluminum around the press fit becomes corroded and no longer conducts as well. The cell contacts operate at high voltage and are not a sensitive connection. The contact does not require cleaning. The contact is tin coated copper. Sandpaper will remove the tin coating.

The photo below shows arcing under the contact pad.DetailsHoneywell 50000293-002 Post Filter (2 Filters) Media post-filter provides enhanced filtration on select models Solid state power supply is self-regulating and maintains peak efficiency during a wide range of cell dirt loading conditions Low-profile door with test button to check system operation Helps filter efficiency-robbing "gunk" before it coats critical system parts Very low pressure drop Item model number: F300E1019 #153,314 in Industrial & Scientific (See Top 100 in Industrial & Scientific) in Home & Kitchen > Heating, Cooling & Air Quality > Air Purifiers > Parts & Accessories in Home Improvement > Building Supplies > HVAC > Furnace Parts & Accessories It works very well, puts out low levels of ozone, enough to keep ducks cleaner and the house fresh, & never too much ozone as well. Equipment as stated wil do the job for years. Series 1 & 2 High Voltage WireRed & Black

This parts drawing is from the F50F Product Data Manual. Where is my model number ? The model number label is located on the inside of the door(94k pdf, 1 photo) Series 1 or 2 Power boxes manufactured in 1998 or later use a power supply compatible with the new W8600F remote performance indicator. (298k pdf, 4 photos) See the Troubleshooting section in the starting at page 20. Basic Power Supply Test Procedure Your indicator light is not coming on Unit never sparks even when using test button Power box switch is ON Door is tight in place Verify Power is Present. Unplug the power box cord and operate a drop-light in the 3-prong receptacle verifying an acceptable voltage and current. Check for Shorted Cells A shorted cell can prevent the indicator light from coming on. Remove both cells, with door back in place operate without cells. If the unit now appears OK with indicator light ON, then the cells have a problem.

Check cells for broken wires Check cells for bent plates Check with one cell at a time (align cell with contacts) Replace or Repair Power Box If the power box is plugged in to 120v and the Neon indicator still does not light without the cells, then the problem is in the power box. Check the on/off switch , Bypass the Air Flow Switch (AFS) , The AFS is a sensor that signals the power supply when air flow is present. Disabling the AFS will simulate the ON state. Using a jumper wire, ground AFS resistor to the chassis, see Replace Air Flow Switch , if the Neon indicator lights and unit appears to work with the AFS disabled. Replace Power Supply , if the Neon indicator does not light with the AFS disabled and no cells to short the output. Power Supply 208414 Installation. is not likely if test button does not spark. The neon lamp voltage measures 125 vdc. Troubleshooting flowchart, assembly drawing, exploded view, parts list.

Troubleshooting starts at page 20. (610k pdf, 24 pages) F50F Product Data - 1994 Troubleshooting flowchart, assembly drawing, exploded view, parts list. The power supply wiring in earlier models had individual connectors where as later models used modular molex connectors. (824k pdf, 40 pages) Lookup part numbers with your model number. Part numbers for power supply, air flow switch, and power box. (70k pdf, 2 pages) Early (1994) F50F power supplies 203101 used individual post connectors for each wire, new power supplies have modular connectors but also have posts for retrofit. (603k pdf, 2 pages) How it works, shorting resistor to override AFS, voltage measurements, dimensions. (81k pdf, 2 pages) Instructions included with Air Flow Switch 202121a. This part is obsolete, these instructions are FYI. (139k pdf, 1 page) F50F Product Data Manual Replacing ionizing wires, see page 15. Cell cleaning, page 13. Ohmmeter test page 15.