Whitfield Photo-Eye Proof of Fire Lens: 14750404

Earth Stove

• Traditions T300P

Whitfield

• Optima 2 FS
• Optima 3 FS
• Optima 3 INS
• Profile 20 FS (7495 - 7494)
• Profile 30 FS (11905 - 11904)
• Profile 30 INS (11905 and up - 11904)
• Traditions T300P (Post: 5493)
• Traditions TP300

Startup Sequence for Lennox Whitfield Control boards with Auto Ignition that use a Photo-Eye for “Proof-of-Fire”

1. All controllers are equipped with a startup timer fault delay of 14 minutes, 15 seconds. If the photo-eye does not detect flame (Fire Dominance Scheme) within this allotted time, the green fault light will flash and all power to components will be cut.
2. When the power is turned “ON”, either by pressing the power button or initiated by a thermostat, fuel will feed at a 100% rate (constant feed) for 1 minute, 50 seconds with a feed trim setting of “0”. Feed trim settings range from 1:26 to 2:14, depending upon desired range, +4 to -4 respectively.
3. Combustion fan starts (startup default medium range). Any change to settings are visible on the indicator but will not take effect until “Proof-of-fire”.
4. Room blower starts (startup default medium range) Any change to settings are visible on the indicator but will not take effect until “Proof-of-fire”.
5. The igniter is powered “ON”, line voltage.
6. At 3 minutes, the control board sends a 5-volt signal to photo-eye. When the cell detects light from the fire (fire dominance scheme), a 2.4-volt signal is created by the photocell which closes the solenoid in the photo-eye circuit and returns the 5-volt signal back to the control board, “Proof-of-fire” achieved.
7. If “Proof-of-fire” is not achieved at 4 minutes, a 2nd supplemental fuel feed is initiated for 30 seconds. At 6 minutes, if “Proof-of-fire” is not achieved a 3rd supplemental fuel feed is initiated for 30 seconds.
8. If the Photo-Eye loses sight control for more than 3 minutes, 15 seconds at any time or if the controller is powered off, "SHUTDOWN" is initiated.

Whitfield stoves made by Lennox used a photo-eye to detect proof of fire. Of the stoves that use the photo-eye, most will have it located in the hopper, sealed in a box directly over the drop tube at the top of the auger flighting, though many Profile 20 and 30 models had the photo-eye located under the hopper. The photo-eye can have 4 points of failure.

1. Most common and most overlooked, Molex connector at control board where the two yellow wires connect can develop a poor connection and need to be cleaned to allow the 5v signal from the controller to send and return
2. For stoves with inside hopper mounting, dust (fines) can get into the cover and obstruct the amber lens OR soot can get under the amber lens
3. Photocell (eye) pins need to be cleaned - Remove photocell from the solenoid, clean with contact cleaner, reinstall, attach clips from DMM to each wire of the photo-eye set the DMM for continuity and shade the eye from any light, there should be no continuity, expose the photo-eye to direct light (sun, flashlight, etc) the DMM should sound off for continuity. If it doesn’t, replace the photo-eye
4. Check for a wire obstruction in the mounting box, a bent mounting arm or missing or loose nut inside mounting the photo-eye inside the cover. The photo-eye needs to aim straight down into the feed tube, if it is out of alignment, it may not work properly.

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