Honeywell Power Supply F52F Series One 20x25

F52F - Determining Series One or Two

W8600F Series TWO	Choosing a replacement power supply is dependent on the series. If you do NOT have the optional wall mounted Remote Performance Indicator (W8600), the series does not matter. F52F Series 1 was manufactured from 94 to 97. The Series 1 chassis has a 4 connector terminal strip that would be used for the optional W8600E. The Series 2 was manufactured 98 thru 06. The Series 2 chassis has only a blank terminal strip. The terminal strip would be included with the optional W8600F. If you are replacing an F52F power supply that does not have a W8600 and not sure of the series, we recommend choosing the series one power supply. The series one will include a W8600E terminal strip and daughter card that will not be needed if you have a series two.
W8600E Series One

Series One or Series Two

Use the Series One power supply if your current F52F has the terminal strip for the W8600E. The terminal strip on the F52F made from 1994 to 1997 have pin connectors not compatible with the current power supply. Thus the Series One replacement power supply also includes the terminal strip and wire harness.

If you are replacing a power supply that has an existing W8600F, then order the Series Two power supply and reuse the existing terminal strip and harness. You also reuse the small daughter card that plugs in to the power supply. These items were originally supplied with the W8600F.

If your power box has a terminal strip with nothing connected because you are not using a W8600E or W8600F, then use the Series One power supply. Otherwise the Series Two does not have the terminal strip and the old terminal strip will be left to dangle.

The W8600F was introduced in 1998 and was originally available in white or taupe, but the taupe was discontinued mid 2006. The W8600F is now only available in white.

Though the W8600E was replaced by the W8600F in 1998, the W8600E was available as a replacement part until 2004. We no longer have any W8600E left.

Plug Versus Pin Connectors

The photo below shows the replacement power supply and a Series Two plug connection. The photo below shows the same replacement power supply but a Series One pin connection. This Air Flow Sensor would be the type found in a Series One power box. Pin connectors are also used for connecting the neon lamp and terminal strip for the W8600E. Only the Series One power supply includes instructions. The instructions show the wiring diagram for the Series One pin connections. The Series Two power supply does not include instructions because the plug connectors are simple.

Power Supply Inspection

First visually inspect the board. Most problems are visible such as a melted transformer winding or a burnt component such as the surge suppressors RV1 RV2.

Check the thin white ceramic resistor R3, the corner wire can break away. This can cause the collector plates to get power but not the ionizer wires.

Continuous cell sparking (for months) can burn out components or wiring. Resonant sparking causes elevated voltage swings that can break down the insulation on the high voltage wires. Check for scorching.

Often the fuse blows when the switching FET Q1 shorts, we believe from line spikes. Check the fuse continuity. A blown fuse typically reads 4.4M ohm because of circuitry in parallel.

The fuse is soldered in and not replaceable. If there is an internal short the fuse blows so to prevent any components from flaring up. Replacing a blown fuse will not fix the problem.

Honeywell does not release the circuit board schematics. Service tech's want to replace the complete board and be confident. Honeywell does not sell the discrete components. We do not do component level repair of the boards.

Replacing the complete board with a new one with a 2 year Honeywell warranty would be the most reliable repair.

Power Supply Bench Test

Here is our procedure to test the 208427AA power supply. Warning high voltage shock can cause death.

Bypass the air flow sensor to force the power supply ON by grounding the jumper resistor J8, see photo and pdf below.

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 P2 will be 4.2k vdc
Terminal P5 for the neon lamp outputs 100 vdc

Since high voltage meters are not common, Honeywell provides the neon lamp as reliable voltage indicator. If the high voltage output falls below spec the neon lamp voltage will drop out.

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 P3 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. See Spark Test pdf.

Evolution of the F50 Power Supply

The F50A was introduced in 1972 and has evolved in to the current F300. The same collector cells that were used in the F50A are still used in the F300. Thus variations of the current F300 power supply are used as the replacements for the prior F50 models.

In 1972 the F50A had an analog power supply as shown bottom-left. Then in 1987 the F50E was released, The F50E was the same as the F50A but with a new electronic power supply that offered two new optional features. The F50E offers an optional remote indicator and an air flow switch.

In 1993 the F50F was introduced with an all new chassis. The F50F now has all the electronics, from a 120v cord to the contacts for the cells built-in to the power box. Now a simple power box swap was a sure fix.

In 1998 the F50F Series 2 was released with a new optional LCD remote indicator that replaced the prior LED indicator. Also the internal power box wiring was improved with molex plug connectors. The connectors simplified manufacturing and power box repairs.

In 2000 the F300 was introduced that was identical to the F50F but the paint color was changed to blue. The F300 now has post filters that will also slide in to the F50F.

Warranty on Replacement Parts

The Honeywell warranty for F50 Replacement Parts is 2 years. Our customers simply need to ship us the defective part. We test and confirm defective. We then ship back a brand new part at no charge.