the stat is a heat pump stat will adapt for other applications in a heat mode on a Carrier heat pump O/B is not powered and Y takes the place of W1or W{same terminal } G is powered to operate the fan W2 is electric heat The first stage of heat is the "Y" energized and heat from the outside air and compresses motor heat second stage heat is W2 , W2 is also powered in stand alone for emergency heat or electric only heat when temp gets extremely low and you don't get an advantage of heat from outside air R,C,W2,E,Y,O/B,G,L. R 24vac C common W2 electric heat E emergency heat Y compressor run O/B heat /cool electrical selector G fan L I don't remember the use of this terminal see installation instructions for application if you decide to get this thermostat

Does this work for a geothermal heating & air conditioner system

would need to know more about the requirements that your system this stat is 2 heat stages first is heat pump heat the second is heat pump heat and restive heat ,, single stage cool , our stats have been in operation on conventional heat pump air to air units for over a year with no problems,,

can the 2nd stage heat (emergency) be prevented from kicking in if set only to heat and not auxiliary?

You can set it to “slow” which limits it but does not prevent it from coming on all together. The only way I can think of locking out w2 with this thermostat would be to leave that wire disconnected.

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Emerson 1F83H-21NP Heat Pump (2H/1C) Non-Programmable Thermostat

Emerson 1F83H-21NP Heat Pump (2H/1C) Non-Programmable Thermostat

Product ID: 573702886

Details

Brand
White-Rodgers
Controller type
Push Button
Model name
80 Series
Product dimensions
152D x 29W x
Special features
Programmable

⚡dual fuel ready, no sensors

📺4.5-inch backlit display

🔧easy install with built-in level

₨2824

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Description

🔥 Stay cool, stay warm, stay ahead with Emerson’s sleek heat pump thermostat!

LOCK IT DOWN - Keypad lock and temperature limits keep settings secure and prevent unwanted changes.
DUAL FUEL READY - Seamlessly supports dual fuel systems without extra sensors—smart efficiency out of the box.
HASSLE FREE SETUP - Built-in level indicator and pluggable terminals make installation a breeze—get up and running fast.
RELIABLE SIMPLE - Non-programmable design for straightforward, no-fuss heating and cooling control.
CRYSTAL CLEAR CONTROL - Big 4.5-inch backlit display ensures effortless temperature reading anytime, even in low light.

The Emerson 1F83H-21NP is a 4.5-inch backlit, non-programmable digital thermostat designed for heat pump systems with dual fuel capability. Featuring easy installation with a built-in level and pluggable terminals, it offers secure keypad lockout and temperature limits for reliable control. Compatible with 24-volt systems, it supports heating, cooling, and auxiliary/emergency modes, making it a straightforward, efficient solution for modern HVAC management.

Specifications

ASIN	B017ES1OUA
Additional Features	Programmable
Backlight	Yes
Brand Name	White-Rodgers
Color	White
Connectivity Protocol	BACnet MS/TP
Connectivity Technology	Wired
Control Type	Button Control
Controller Type	Push Button
Customer Reviews	4.6 4.6 out of 5 stars (237)
Global Trade Identification Number	00786710551918
Included Components	thermostat
Item Dimensions D x W x H	152D x 29W x 95H millimeters
Manufacturer	Emerson Climate Technologies
Manufacturer Part Number	1F83H-21NP
Model Name	80 Series
Model Number	1F83H-21NP
Number of Batteries	2 AA batteries required. (included)
Number of Items	1
Product Style	Programmable
Screen Size	4.5 Inches
Shape	Rectangular
Specific Uses For Product	Heat Pump
Temperature Control Type	Heating, Cooling
UPC	786710551918 696498759232
Unit Count	1 Count
Voltage	24 Volts

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₨2824

Duties & taxes included

In stock

Sold byAmazon SeychellesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Seychelles.

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TrustScore 4.5 | 7,300+ reviews

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