andrewge
New Member
Hi,
My busted old Honeywell gas control valve has been discontinued years ago.
Bradford White provided the part number that led to the Resideo WT8860A1000 https://jacksonsystems.com/product/...e-ultra-low-nox-water-heaters-w-2-insulation/ as the replacement.
The attached picture shows old Honeywell and new WT8860A1000 control logic boards side-by-side.
The 2 vertical connectors on the right sides of the boards for wires from the thermopile are the only commonality between them.
On the left/old Honeywell, the
o 2 rightmost pins connect to 2 wires for a Resistance Temperature Detector (RTD) screwed on the door of burner's chamber.
o nwzr 3 pins connect to the solenoid hardware (with the protruding water temperature sensor on the back of the valve).
On the right/new WT8860A1000, the
o North/top edge connector is for the solenoid hardware.
o molex with 6 pins and the 3 on-board edge connection strips to its right are what's shown covered by the bulging plastic part of the cover with COM on it as seen through https://jacksonsystems.com/wp-content/uploads/2023/11/12977.png
The included printed "manual" is https://jacksonsystems.com/wp-conte...ell_WT8860_Installation_Instructions-Copy.pdf
It has very minimal information under Wiring section on page 5.
Unclear where the 2 RTD wires are to be connected to on the new WT8860A1000.
Requesting help to identify where to connect the 2 RTD wires to.
Here's how I go about with my "guessing"...
First, I tried to draw some analogies by looking at one of the currently/still offered BW models, https://forthepro.bradfordwhite.com...a-low-nox/ultra-low-nox-atmospheric-vent-gas/
Its corresponding Service Manual is https://s3.amazonaws.com/bradfordwh..._vent_naeca_compliant_servicemanual_51546.pdf
Some of the small pictures give some clues. Unfortunately, as the small pictures have low resolutions and were not captured from a clearer/better angle, there's still some ambiguity to correctly ascertain.
For example, on page 16, it seems the 2 wires are connected to molex pins 1 and 2 (based on numbering shown on https://www.kit-elec-shop.com/19751...le-6-pin-connector-with-6-female-contacts.jpg).
In the picture I attached above, those are the lower-right 2 molex pins, closest to and right above the board.
The above assumes that the circuitries are consistent/similar between different logic boards for various Bradford White gas control valves. I don't know if that's a good assumption.
Hoping some folks here have other information/experience to help identify, maybe the technical documentation showing the pin-out and description of what those molex pins are for, just to be sure?
Many thanks in advance and good night!
My busted old Honeywell gas control valve has been discontinued years ago.
Bradford White provided the part number that led to the Resideo WT8860A1000 https://jacksonsystems.com/product/...e-ultra-low-nox-water-heaters-w-2-insulation/ as the replacement.
The attached picture shows old Honeywell and new WT8860A1000 control logic boards side-by-side.
The 2 vertical connectors on the right sides of the boards for wires from the thermopile are the only commonality between them.
On the left/old Honeywell, the
o 2 rightmost pins connect to 2 wires for a Resistance Temperature Detector (RTD) screwed on the door of burner's chamber.
o nwzr 3 pins connect to the solenoid hardware (with the protruding water temperature sensor on the back of the valve).
On the right/new WT8860A1000, the
o North/top edge connector is for the solenoid hardware.
o molex with 6 pins and the 3 on-board edge connection strips to its right are what's shown covered by the bulging plastic part of the cover with COM on it as seen through https://jacksonsystems.com/wp-content/uploads/2023/11/12977.png
The included printed "manual" is https://jacksonsystems.com/wp-conte...ell_WT8860_Installation_Instructions-Copy.pdf
It has very minimal information under Wiring section on page 5.
Unclear where the 2 RTD wires are to be connected to on the new WT8860A1000.
Requesting help to identify where to connect the 2 RTD wires to.
Here's how I go about with my "guessing"...
First, I tried to draw some analogies by looking at one of the currently/still offered BW models, https://forthepro.bradfordwhite.com...a-low-nox/ultra-low-nox-atmospheric-vent-gas/
Its corresponding Service Manual is https://s3.amazonaws.com/bradfordwh..._vent_naeca_compliant_servicemanual_51546.pdf
Some of the small pictures give some clues. Unfortunately, as the small pictures have low resolutions and were not captured from a clearer/better angle, there's still some ambiguity to correctly ascertain.
For example, on page 16, it seems the 2 wires are connected to molex pins 1 and 2 (based on numbering shown on https://www.kit-elec-shop.com/19751...le-6-pin-connector-with-6-female-contacts.jpg).
In the picture I attached above, those are the lower-right 2 molex pins, closest to and right above the board.
The above assumes that the circuitries are consistent/similar between different logic boards for various Bradford White gas control valves. I don't know if that's a good assumption.
Hoping some folks here have other information/experience to help identify, maybe the technical documentation showing the pin-out and description of what those molex pins are for, just to be sure?
Many thanks in advance and good night!
