The L4029E1029 is a high limit control from Resideo (Honeywell Home), fixed 200 °F, 3 in insert, manual reset.
The limit is the control that is supposed to never operate. It watches the plenum and breaks the burner circuit if temperature climbs past the setting — the case where the blower has failed, a filter has collapsed or a damper is shut and the heat has nowhere to go.
Manual reset is deliberate. A limit that resets itself lets the furnace keep cycling on an overheat condition and hides the fault. One that stays open forces somebody to find out why it tripped.
Insert length has to match the plenum. Too short and the element sits in the sheet metal instead of the airstream; too long and it can reach the heat exchanger.
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Brand: Resideo (Honeywell Home)
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Manufacturer Part #: L4029E1029/U
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Type: High limit control, manual reset
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Setting: Fixed 200 °F
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Insert length: 3 in
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UPC: 085267049368
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Category: Fan & Limit Controllers
Full Specifications
| Application |
Provides high limit cutout with manual reset in warm air or air conditioning systems, Warm air systems, the L4029 may be used as secondary high limits for positive burner shutdown on fan failure, or on reverse airflow in counterflow furnaces, Limits may also be used to detect heat from a fire in air conditioning or ventilation ducts and shut off air circulation to contain the fire |
| Product Features |
Shuts off the fan when air temperature is indicative of fire, Internal snap-acting switch actuated by a bimetal strip inserted directly into the air stream responds rapidly to temperature changes, Requires manual reset |
| Approvals and Standards |
UL Listed: File No. MP466, Vol. 8, Guide No. MBPR2, CSA Certified: File No. LR95329-5 |
| Ambient Operating Temperature (Max) |
190 °F, 88 °C |
| High Limit Differential Temperature |
25 °F, 14 °C |
| Electrical Ratings at Full Load |
Limit: 2 A @ 30 V AC: 10 A @ 120 V AC: 5 A @ 240 V AC |
| Electrical Ratings at Locked Rotor |
Limit: 60 A @ 120 V AC: 30 A @ 240 V AC |
| Pilot Duty Rating |
0.25 A @ 0.25 to 12 V DC |
| Switch Action |
Normally closed SPST switch opens on temperature rise to the set point, Switch must be manually reset to operate |
| Element Insertion Length |
3 in, 76 mm |
| Product Height |
3.75 in, 95 mm |
| Product Width |
2.31 in, 59 mm |
| Additional Dimensions Details |
2 in deep excluding element, 51 mm deep excluding element |
| Finish |
Smooth Gray |
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