Overview
Honeywell HE280C2010/U Higher Capacity Whole House Bypass Humidifier
Controller Images
Schematic
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.
Other thoughts:
- D2 is a zener diode which acts as a voltage regulator for the 555 chip.
555 Timer Reference Diagram
The Fix
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.
New Parts
| Part | Cost | Image |
|---|---|---|
| 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 |
|
Finish Product
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.
Future Updates
- Replace solenoid output connector with barbed connector
References
| Reference | URL |
|---|---|
Honeywell 17 Gallon Whole House Bypass Humidifier | https://www.homedepot.ca/en/home/p.17-gallon-whole-house-bypass-humidifier.1000151258.html |
| Honeywell Installation Instructions | https://customer.honeywell.com/resources/techlit/TechLitDocuments/69-0000s/69-1570.pdf |
| 555 Timer | http://www.ti.com/lit/ds/symlink/lmc555.pdf |