Go Daddy Authorize.net
Click Here to Learn More
(866) 432-8551 Toll Free
Mon to Fri 10am to 6:30pm EST
Confused? Get help finding the right part

Rollover image above to zoom

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

Price: $139.88 
Excl. Shipping
SKU: THE841A1217
(See Product Details Below for Manufacturers Part Numbers)
Discount Shipping

Our volume UPS discounts are passed-on directly to you for the lowest possible shipping rates.

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

I called trying to find out what happened to the rest of my order and was surprised to hear a warm and kind voice willing to do whatever it takes to find answers and follow through with her promise. Amanda is an asset worth holding on to and a credit to your company. She was very professional, helpful and courteous while assisting me with my order. I would most definitely assign her an A+ in customer service."
Donald "Brad" Thomas

I would like to thank you for your hard work in getting us our part in a timely fashion. You were very helpful and you understood the severity of the situation and did a wonderful job in getting the part to us. Thanks again and please share this with your boss! You were outstanding!"
Todd Mills

Share This:
Have Questions? Prefer to order by phone?
Our parts Experts are happy to help!

Call Monday to Friday 10am - 6:30pm EST
1-866-432-8551 or Email our Parts Experts
Accredited BusinessGo DaddyAuthorize.net
Amanda I want to thank you, the blower fan work perfectly. Thank you so very much."
Bill K Roberts
Amanda, Thank you very much again, I have been looking for this part for about two weeks and getting very frustrated in the process of the search, you were very helpful!!"
Ken Holm
Why Buy From Us?
110% Lowest Price Guarantee
Over 500,000 Parts in Stock
Same Day Shipping on Orders Received Before 3pm EST (Mon-Fri)
Nationwide Distribution Centers for Fast Delivery
Choose from UPS Next-Day, 2-Day, 3-Day and Ground Service
We Supply Retail and Wholesale
Order from us.
Risk Free, with
Our Triple Guarantee
Guarantee 1
No hassle, 30-day returns policy
Guarantee 2
110% Lowest price guarantee
Guarantee 3
90-day warranty
Sign up for Special Offers Directly from AmericanHVACParts.com
AmericanHVACParts.com | 1529 W. 13th St., Suite #F | Upland, CA 91786
© 2005-2015 AmericanHVACParts.com. All Rights Reserved.