The L4064B2236 is a high limit control from Resideo (Honeywell Home), fixed 200 °F, 8 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 #: L4064B2236/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: 8 in
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Category: Fan & Limit Controllers
Full Specifications
| Application |
Forced Warm Air Heating Systems |
| Product Features |
Three wiring terminal options available for easy installation, Push in receptacles for stripped wire, Female receptacles for 1/4 inch male flag connectors, Field adjustable fan and high limit settings, Has manual fan switch that overrides the fan control to keep the fan running continuously |
| Approvals and Standards |
UL Listed File MP466, Guide MBPR, CSA Certified: File No. LR1622 |
| Compatible With |
Forced Warm Air Heating Systems |
| For Use With |
Breakaway Jumper, Manual and Automatic fan on/off settings |
| Includes |
Breakaway Jumper, Manual and Automatic fan on/off settings |
| Element Type |
Helical bimetal |
| Ambient Operating Temperature (Max) |
190 °F, 88 °C |
| Fan-Off Temperature (Max) |
200 °F, 93 °C |
| Fan-Off Temperature (Min) |
50 °F, 10 °C |
| Fan-On Temperature (Max) |
215 °F, 102 °C |
| Fan-On Temperature (Min) |
65 °F, 18 °C |
| High Limit Differential Temperature |
25 °F, 14 °C |
| High Limit Temperature (Max) |
250 °F, 121 °C |
| High Limit Temperature (Min) |
100 °F, 38 °C |
| Surface Mounting Temperature (Max) |
190 °F, 88 °C |
| Electrical Ratings at Full Load |
Fan: 14 A @ 120 V AC: 7 A @ 240 V AC, Limit: 8 A @ 120 V AC: 4 A @ 240 V AC |
| Electrical Ratings at Locked Rotor |
Fan: 84 A @ 120 V AC: 42 A @ 240 V AC, Limit: 48 A @ 120 V AC: 24 A @ 240 V AC |
| Pilot Duty Rating |
0.25 A @ 0.25 to 12 V DC, 2 A @ 24 V AC |
| Switch Action |
Fan switch makes on temperature rise, High Limit Switch breaks on temperature rise |
| Manual Fan Switch |
Yes |
| Element Insertion Length |
8 in, 203 mm |
| Element Temperature (Max) |
350 °F, 177 °F |
| Product Height |
4.28 in |
| Product Length |
3 in |
| Product Width |
1.49 in |
| Finish |
Zinc- Plated Steel |
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