| Models: | 6” (150 mm) leadwires suitable for connecting to aluminum T451A SPST and T451B DPST (with positive off) for conductors wiring if used with approved special service |
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| heating only. | CO/ALR solderless wire connectors. Leadwires color- |
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| T651A SPDT for heating/cooling. | coded red for heating, blue for cooling, black for common. |
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| Control Range: | Approvals: 44 - 86°F (7 - 28°C) for models T451A, T651A. Canadian Standards Association Certified; File No. LR1322 50 - 86°F (10 - 28°C) for model T451B. Performance Certified for electric heating per C273.4A. |
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| Differential: 2°F (1°C) | Accessories: 272804A Range stops and cover locking assembly |
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| Droop: 2°F @ mid load range. | (included in selected models only). wall marks. TG511 Thermostat guard for security and protection. Fig. 1 — Dimensions of T451, T651 in inches (mm): 50/60Hz 120 V 208V 240V 277V |
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| Full Load | 9.8A 5.6A 4.9A 4.2A |
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| Locked Rotor | 58.8A 33.6A 29.4A 25.2A |
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| Pilot Duty | 125 VA |
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| Resistive | 22A Non Inductive 19ANI |
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| Heating Only | 2.5kW 4.5kW 5kW 1. Model 2. Electrical load(s) 3. Accessories. 1. Your local Honeywell Home and Building Control Sales Office (check white pages or phone directory). 2. Home and Building Control Customer Satisfaction Honeywell Inc., 1885 Douglas Drive North. Minneapolis, MN 55422 (612) 951-1000 3. In Canada — Honeywell Limited, 35 Dynamic Drive, Toronto, ON M1V 4Z9, 1-800-405-9835. |
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| WHEN INSTALLING THIS PRODUCT: | Fig. 2 — Wiring connections |
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| T451A (Heat only) | T451B (Heat only with positive off) instructions can damage product or cause a hazardous |
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| condition. | To |
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| To | Heating Load Load make sure product is suitable for your application. technician. |
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| T651A (Heat only) | T651A (Cool only application) |
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| check out product operation. | To Heating Load Cooling Load ! WARNING This thermostat is a line voltage (120 to 277 Vac) T651A (Heat–Cool application) control. Do not install it unless you are completely To Heating |
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| familiar and competent with home wiring. | Load If improperly handled there can be a risk of To Cooling 240 volt electric shock hazard which may cause Load serious injury or death. 1 Power supply; provide disconnect means and overload protection as required. 2 Breaks on Positive Off. |
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| ! CAUTION | 3 Exposed unused wires must be properly insulated. 4 Contact makes Black to Red on temperature fall; 1. Disconnect power supply before making wiring Black to Blue on temperature rise. connections to prevent electrical shock or equipment damage. 4. Pre-bend and push leadwires into the electrical junction 2. All wiring must comply with national and local codes box. and ordinances. 5. Hold the thermo |
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| New Installations | setting dial to the mid-position (indicator pointing to the top of the thermostat): this will prevent damage to the 4’ to 5’ (1.5 m) above the floor on an inside wall or pillar driver when the top mounting screw is tightened. Do where the thermostat will be subjected to typical room NOT press on diaphragm, diaphragm lever arm or |
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| temperature. | setpoint knob to seat thermostat on the box : thermostat NOTE: To sense temperature properly, the thermostat will be damaged. must be placed away from concealed warm or cold water pipes, air ducts, or drafts from hallways, fireplaces or Replacement Applications stairways. Do not place thermostat above convectors or in the flow from supply fans. Ideally, a thermostat should 1. Disconnect power supp |
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| average room temperature. | damage. All wiring must comply with applicable codes and standards. 2. Remove the old thermostat from the wall, taking care not NOTE: T651A and T451A do not feature a Positive Off to damage the wiring insulation. setting, and may not be used as a disconnect switch. 3. Check the old insulation for cracks, nicks or fraying. Apply connections. Use solderless connectors approved for the or replace the |
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| Check Out | 4. Install the cover. Wait five minutes to let the thermostat thermally stabilize and re-check calibration. |
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| Fig. 4 — Recalibrating | Fig. 5 — Installing NOTE: For T451A and T651A models only, the thermostat Thermostat Range Stops will call for heat (disable cooling) when the setpoint dial is at full counter-clockwise position. This setting is the phase change point of the diaphragm’s vapor fill and is independent of calibration. To de-energize the load(s), turn off power at the circuit breaker panel, or add a separate disconnec |
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| Elevation | Recommended 3. Re-install cover. Check operation of range stops. (in feet) Typical City Action Fig. 6 — Cover Locking Kit 0 to 2000 Toronto, Ontario Leave as is Phoenix, Arizona |
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| Calgary, Alberta | 2 to 3 marks |
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| Salt Lake City, Utah | 4 to 5 marks radial mark visible on top of the triangular arm that holds Locking Cover |
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| the dual diaphragm sensor (Fig. 4). | 1. Remove cover by pulling straight out. by pulling straight out, while holding the base against thermostat base. |
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| the wall. | 3 Drive Allen screw into Speed Nut until head is flush with amount of temperature error. Each mark on the triangular 4. Re-install cover. Lock by backing out Allen screw until arm represents 2°F (1°C) of adjustment. Snap the knob screw body protrudes through cover hole. To unlock cover, |
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| back onto the setpoint cam. | drive Allen screw into thermostat base. |
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| Home and Building Control | Home and Building Control |
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| Honeywell Inc. | Honeywell Limited-Limitée |
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| Golden Valley, MN 55422 | Toronto, ON M1V 4Z9 |
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