SUPCO
SUPCO Gas Limit Furnace Thermostat 200/240°F 40°F Diff 120-480V
Gas limit furnace thermostat with fixed 200/240 °F settings, 40 °F differential, auto-reset plenum mount and SPST switch action for 120-480 V systems
- Auto-reset limit protects furnace from overheating
- Fixed 200/240 °F cut-out with 40 °F differential
- SPST switch opens on temperature rise
- Plenum-mount design with 3 1/8 in insertion length
- Rated for 120, 240 and 480 V systems
Commercial Heating Limit Control
This Supco limit control is a fixed-temperature, auto-reset safety switch designed for gas-fired furnace plenums. It opens on temperature rise to interrupt the burner circuit when the plenum reaches the factory-set limit. The device suits HVAC technicians and maintenance crews servicing compatible Carrier and Bryant heating equipment.
Replaces Three OEM Part Numbers
The control directly replaces Carrier and Bryant part numbers HH12ZA252A, P331-2217 and HH12ZA240A. This cross-reference lets a technician consolidate inventory to a single SKU for multiple service calls. The SPST switch action and automatic reset restore operation without manual intervention once the plenum cools.
Verify Voltage Range And Insertion Depth
Confirm the appliance operates within the 120, 240 or 480 volt range before installation. The insertion element measures 3 1/8 inches; ensure the mounting location accommodates this length. The fixed 200/240°F limits and 40°F differential are not adjustable, so the unit must match the original equipment specifications exactly.
Highlights
- Auto-reset limit protects furnace from overheating
- Fixed 200/240 °F cut-out with 40 °F differential
- SPST switch opens on temperature rise
- Plenum-mount design with 3 1/8 in insertion length
- Rated for 120, 240 and 480 V systems
Specifications
| Brand | Supco |
|---|
Questions about this item
Will the 3 1/8 in insertion element need periodic cleaning or replacement?
The fixed-temperature limit control uses a sealed SPST switch with no user-serviceable parts; the 3 1/8 in insertion element is not designed for cleaning or replacement.
What stops the furnace first during a long heating cycle — the 240 °F open-on-rise limit or the 40 °F differential?
The 240 °F fixed limit opens first on temperature rise; the 40 °F differential only determines when the auto-reset contact closes again after cool-down.
How much heat does the 15 A / 120-480 V switch dissipate when the blower runs continuously?
The SPST contact is rated 15 A at 120 V and 10 A at 240/480 V; power loss across the closed contacts is minimal and does not raise plenum temperature.
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