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Honeywell HE280C2010/U Higher Capacity Whole House Bypass Humidifier
Humidifier Pad - HC26A
Fix - No Water Flow
A some point the solenoid failed. I think the original solenoid is garbage so I will replace with something a bit more robust.
Here is the schematic that I put together based on some testing.
You would think that the GND pin on the 555 would go to ground via a pullup and that would be that.
- D2 is a zener diode which acts as a voltage regulator for the 555 chip.
555 Timer Reference Diagram
Fixing the Solenoid
Since the solenoid was no longer activating, it seemed like a replacing it was in order. The replacement solenoid that I purchased was rated 24 VDC but didn't activate when connected. Perhaps the transistor Q1 does support the amount of current required by the new solenoid.
I opted to bypass the 555 timer circuitry by connecting pin 4 of the internal connector (under cap) to ground. The 555 timer is not required.
|Baomain 1/4 Inch Brass Electric Solenoid Valve for Air Water Valve N/C (Normally Closed) DC 24V||$22.00 CAN|
Generic Pneumatic Push in Quick Touch to Connect Fitting 1/4" OD Tube x 1/4" Male NPT 90 Deg Swivel Elbow Coupler.
I would have bought straight ones but couldn't find them for a good price.
|$13.00 CAN for 5|
Here is a picture of the finished fix. Should be more maintainable now that these changes have been made. The new solenoid valve will allow a lot of water to pass so I have ball valve (not shown) limiting the flow to a trickle.
- Replace solenoid output connector with barbed connector
Honeywell 17 Gallon Whole House Bypass Humidifier
|Honeywell Installation Instructions||https://customer.honeywell.com/resources/techlit/TechLitDocuments/69-0000s/69-1570.pdf|