Power Supply for dual cell F50A and F50E 240v 20x25. Ionizer current is preset for 2.1mA. This power supply is for power boxes with the W8600 terminal strip and without the air flow sensor. Can also be used in a power box without the terminal strip and simply not use the harness. Honeywell 2 year warranty.
The circuit board has an approximate size of 4½ x 6½ x 1¾ inches. This kit includes the power supply with the wiring harness and terminal strip. Also included is the metal base.
Replaces 201508Q 203327E. For 120v use the 207427AB or 208420A.
The 208427M power supply provides the connection for the W8600 remote indicator. The 208427M is for a power box with the terminal strip as in photo below on right. The 208427 has a w8600e daughter card and includes the wiring harness and terminal strip for the W8600E.
If your powerbox has an unused terminal strip because you are not using the W8600, you can use this power supply and internally not connect the unused terminal strip.
The 208427 series provides a connection for the W8600E whereas the 208425 series does not. For 120v use the 207427AB or 208420A.
The 208427M does not require an air flow sensor. This power supply runs as soon as 240v is applied. Used in an F50A-E that is wired to the furnace blower or through a sail switch.
This power supply has been configured for use in a power box without the air flow sensor. The animated photo below shows a power box with and without the air flow sensor.
Honeywell has disabled the air flow sensor feature by cutting the jumper J8. Restoring the jumper will allow the use of an air flow sensor. If your F50A-F50E power box has the air flow sensor and it is needed, then you need to replace the complete power box with the 208420A.
Here is a PDF with high resolution photos of the F50E power box. The photos show the box stripped and then with a new 208427AB installed. Also shown is a photo and schematic of the switch with the neon lamp.
Also see the PDF showing the uncommon edge connector and the piggy back connector.
First visually inspect your 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.
Here is our procedure to test the 208427M power supply. Warning high voltage shock can cause death.
The 208427M has the air flow sensor disabled, the jumper J8 has been cut. This power supply does not requir