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2 Heat/1Cool Stage Thermostat with manual changeover and E,O,Y,R,G,X,L,B,W2 terminals for multistage

Price: $139.88
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SKU: THE841A1217
(See Product Details Below for Manufacturers Part Numbers)
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2 Heat/1Cool Stage Thermostat with manual changeover and E,O,Y,R,G,X,L,B,W2 terminals for multistage heat pumps


Heat Pump/Multistage Thermostats provide low voltage (24 Vac) control of two-stage heating and one-stage cooling heat pump systems using manual changeover.


Coiled bimetal element operate dust-free mercury switches. Heat anticipators are adjustable or fixed; cooling anticipator is fixed. Mount directly on wall or horizontal outlet box; no separate subbase necessary. T841E model available for two-stage gas valves.

Product Specifications

Application Multistage Heat Pumps

Mounting Horizontal

Changeover Manual

Color Beige

Stages 2 Heat/1 Cool

Terminal Designations W3, R, L, X, W2, G, O, E, Y, B

Switch Positions (Fan) AUTO-ON

Switch Positions (System) EM. HEAT-HEAT-OFF-COOL

Switch Type Mercury

Switching Action 1st Stage SPDT; Second Stage SPST

Accuracy (F) 2 F

Accuracy (C) 1 C

Dimensions (in.) 3 1/2 in. high x 5 1/4 in. wide x 2 1/16 in. deep

Dimensions (mm) 89 mm high x 133 mm wide x 52 mm deep

Setting Temperature Range (F) 45 F to 85 F

Interstage Differential Temperature (F) 1 F

Interstage Differential Temperature (C) 0.6 C

Electrical Ratings 20 to 30 Vac.

Anticipator (cooling) 0 to 1.5A fixed

Anticipator (heating) First stage 0 to 1.5A fixed; Second stage 0.1 to 1.2A adj.

Currents (Cooling) 1.5A running, 6.5A inrush at 30 Vac max.

Currents (Heating) 1st Stage 1.5A running, 6.5A inrush at 30 Vac max.;2nd Stage 1.5 running and 6.5A inrush at 30 Vac max.
Currents (Fan) 0.02A to 0.5A running, 2.5A inrush

Sensor Element Bimetal

Fan Operation Auto Fan in EM. HEAT


Ambient Temperature Range (F) 45 F to 85 F

Ambient Temperature Range (C) 7C to 29 C

Replaces Part Numbers: CART841A1217

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