We ship worldwide — Singapore, Australia, Malaysia, Indonesia, Philippines, India, Middle East & more

3G Electric
RFQ CartGet a QuoteSign inSign up
EMERSON Low Voltage Thermostat: Heat or Cool, Manual, C/G/L/O/B/R/W2/Terminal Designations - Digital Thermostats
EMERSONDigital Thermostats

EMERSON Low Voltage Thermostat: Heat or Cool, Manual, C/G/L/O/B/R/W2/Terminal Designations

The EMERSON Low Voltage Thermostat (MPN 1F89EZ-0251) is a digital thermostat for heat or cool applications, featuring a rectangular shape and push-button controls. It operates on 20V AC with a manual changeover type…

SKU 3G-OTH-70502

Brand
EMERSON
Item
Low Voltage Thermostat: Heat or Cool, Manual, C/G/L/O/B/R/W2/Terminal Designations
Category
Digital Thermostats
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineer
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Technical Specifications

EMERSON
Manufacturer Part Number
1F89EZ-0251
Type
Manual, C/G/L/O/B/R/W2/Terminal Designations, Auto-On
Shape
Rectangle
Voltage
20V AC
Digit Size
Easy Read
Application
Heat or Cool
Control Type
Push Button
Fan Settings
Auto-On
Key Features
Home-Sleep-Away Preset Buttons
Changeover Type
Manual
System Settings
Cool-Heat-Off
Mounting Direction
Horizontal
Terminal Designations
G
Temperature Differential
0.6° to 1.7°F
Temperature Control Range
45° to 99°F
View Full Spec Sheet

Technical Documents

No technical documents available for this product.
Request documentation →
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

EMERSON Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The EMERSON Low Voltage Thermostat (MPN 1F89EZ-0251) is a digital thermostat for heat or cool applications, featuring a rectangular shape and push-button controls. It operates on 20V AC with a manual changeover type and system settings of Cool-Heat-Off, along with Auto-On fan settings. Key specifications include a temperature control range of 45° to 99°F, a temperature differential of 0.6° to 1.7°F, and Home-Sleep-Away preset buttons. The thermostat has terminal designations for G and is designed for horizontal mounting.

Used in

Common applications for EMERSON
Commercial refrigeration — Emerson single-stage electronic control (SKU 44R204) for walk-in coolers and freezers
HVAC system retrofits — Emerson low-voltage digital thermostat (SKU 3MY10) for heat or cool control in office buildings
Industrial process temperature — Emerson line-voltage mechanical thermostat (SKU 2E399) for equipment heating in manufacturing
Residential heating — Emerson analog heat-only thermostat (SKU 3MU96) for baseboard or radiant systems
Heat pump installations — Emerson standard thermostat (SKU 42PD14) for 1H/1C heat pump systems in commercial spaces
Cooling-only applications — Emerson mechanical cool-only thermostat (SKU 3MU97) for server rooms or storage areas

EMERSON Products

3G Electric supplies EMERSON digital thermostats. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

Similar products

Matched by specification & description
EMERSON Low Voltage Thermostat: Heat or Cool, Manual, C/E/G/L/O/B/R/W2/Terminal Designations, 20V AC (MPN 1F79-111). Key specifications — Application: Heat or Cool; Key Features: Selectable Celsius or Fahrenheit Temperature Display; Temperature Differential: 0.8° to 1.5°F; Voltage: 20V AC; Terminal Designations: Y; System Settings: Cool-Emergency Heat-Heat-Off; Temperature Control Range: 45° to 99°F; Changeover Type: Manual.
EMERSON
EMERSON Low Voltage Thermostat: Heat or Cool, Manual, C/E/G/L/O/B/R/W2/Terminal Designations, 20V AC (MPN 1F79-111). Key specifications — Application: Heat or Cool; Key Features: Selectable Celsius or Fahrenheit Temperature Display; Temperature Differential: 0.8° to 1.5°F; Voltage: 20V AC; Terminal Designations: Y; System Settings: Cool-Emergency Heat-Heat-Off; Temperature Control Range: 45° to 99°F; Changeover Type: Manual.
EMERSON Low Voltage Thermostat: Heat or Cool, Manual, B/G/O/RC/RH/W/Terminal Designations, Auto-On (MPN 01E78 144). Key specifications — Application: Heat or Cool; Key Features: Selectable Celsius or Fahrenheit Temperature Display; Temperature Differential: 0.8° to 1.5°F; Voltage: 20V AC; Terminal Designations: W; System Settings: Cool-Heat-Off; Temperature Control Range: 45° to 99°F; Changeover Type: Manual.
EMERSON
EMERSON Low Voltage Thermostat: Heat or Cool, Manual, B/G/O/RC/RH/W/Terminal Designations, Auto-On (MPN 01E78 144). Key specifications — Application: Heat or Cool; Key Features: Selectable Celsius or Fahrenheit Temperature Display; Temperature Differential: 0.8° to 1.5°F; Voltage: 20V AC; Terminal Designations: W; System Settings: Cool-Heat-Off; Temperature Control Range: 45° to 99°F; Changeover Type: Manual.
EMERSON Low Voltage Thermostat: Heat and Cool, Manual, A/B/G/O/RC/RH/W/Terminal Designations (MPN 1E56N-444). Key specifications — Application: Heat and Cool; Key Features: Vibration Resistant; Temperature Differential: 1°F Heating, 1.5°F Cooling; Voltage: 20 to 30V AC; Terminal Designations: Y; System Settings: Cool-Heat-Off; Temperature Control Range: 50° to 90°F; Changeover Type: Manual.
EMERSON
EMERSON Low Voltage Thermostat: Heat and Cool, Manual, A/B/G/O/RC/RH/W/Terminal Designations (MPN 1E56N-444). Key specifications — Application: Heat and Cool; Key Features: Vibration Resistant; Temperature Differential: 1°F Heating, 1.5°F Cooling; Voltage: 20 to 30V AC; Terminal Designations: Y; System Settings: Cool-Heat-Off; Temperature Control Range: 50° to 90°F; Changeover Type: Manual.
EMERSON Low Voltage Thermostat: Heat Only, RH/W, Auto, On-Off, On-Off/Auto, Vertical, Rectangle (MPN 1E78-140). Key specifications — Application: Heat Only; Key Features: Selectable Celsius or Fahrenheit Temperature Display; Temperature Differential: 0.8° to 1.5°F; Voltage: 20V AC; Terminal Designations: RH; System Settings: On-Off; Temperature Control Range: 45° to 99°F; Shape: Rectangle.
EMERSON
EMERSON Low Voltage Thermostat: Heat Only, RH/W, Auto, On-Off, On-Off/Auto, Vertical, Rectangle (MPN 1E78-140). Key specifications — Application: Heat Only; Key Features: Selectable Celsius or Fahrenheit Temperature Display; Temperature Differential: 0.8° to 1.5°F; Voltage: 20V AC; Terminal Designations: RH; System Settings: On-Off; Temperature Control Range: 45° to 99°F; Shape: Rectangle.
EMERSON Low Voltage Thermostat: Heat and Cool, Manual, A/B/G/O/RC/RH/W/Terminal Designations (MPN 1F56N-444). Key specifications — Application: Heat and Cool; Key Features: Vibration Resistant; Temperature Differential: 1°F Heating, 1.5°F Cooling; Voltage: 20 to 30V AC; Terminal Designations: Y; System Settings: Cool-Heat-Off; Temperature Control Range: 50° to 90°F; Changeover Type: Manual.
EMERSON
EMERSON Low Voltage Thermostat: Heat and Cool, Manual, A/B/G/O/RC/RH/W/Terminal Designations (MPN 1F56N-444). Key specifications — Application: Heat and Cool; Key Features: Vibration Resistant; Temperature Differential: 1°F Heating, 1.5°F Cooling; Voltage: 20 to 30V AC; Terminal Designations: Y; System Settings: Cool-Heat-Off; Temperature Control Range: 50° to 90°F; Changeover Type: Manual.
EMERSON Low Voltage Thermostat: Heat and Cool, Manual, A/B/G/O/RC/RH/W/Terminal Designations, 30V AC (MPN 01C26 101S1). Key specifications — Application: Heat and Cool; Temperature Differential: 2°F Heating, 4°F Cooling; Voltage: 30V AC; Terminal Designations: Y; System Settings: Cool-Heat-Off; Temperature Control Range: 50° to 90°F; Changeover Type: Manual; Shape: Rectangle.
EMERSON
EMERSON Low Voltage Thermostat: Heat and Cool, Manual, A/B/G/O/RC/RH/W/Terminal Designations, 30V AC (MPN 01C26 101S1). Key specifications — Application: Heat and Cool; Temperature Differential: 2°F Heating, 4°F Cooling; Voltage: 30V AC; Terminal Designations: Y; System Settings: Cool-Heat-Off; Temperature Control Range: 50° to 90°F; Changeover Type: Manual; Shape: Rectangle.

More from EMERSON

View all EMERSON parts →
EMERSON Low Voltage Thermostat: Heat or Cool, Manual, C/E/G/L/O/B/R/W2/Terminal Designations, 20V AC (MPN 01F89 211S1). Key specifications — Application: Heat or Cool; Key Features: Batteries Not Required; Temperature Differential: 0.6° to 1.5°F; Voltage: 20V AC; Terminal Designations: L; System Settings: Cool-Heat-Off; Temperature Control Range: 45° to 99°F; Changeover Type: Manual.
EMERSON
EMERSON Low Voltage Thermostat: Heat or Cool, Manual, C/E/G/L/O/B/R/W2/Terminal Designations, 20V AC (MPN 01F89 211S1). Key specifications — Application: Heat or Cool; Key Features: Batteries Not Required; Temperature Differential: 0.6° to 1.5°F; Voltage: 20V AC; Terminal Designations: L; System Settings: Cool-Heat-Off; Temperature Control Range: 45° to 99°F; Changeover Type: Manual.
EMERSON Low Voltage Thermostat: Heat or Cool, Manual, C/E/G/L/O/B6/R/W2/Terminal Designations (MPN 1F83H-21NP). Key specifications — Application: Heat or Cool; Key Features: Temperature Limits; Temperature Differential: 0.5° to 1.2°F; Voltage: 20V AC; Terminal Designations: C; System Settings: Cool-Heat-Off; Temperature Control Range: 45° to 99°F; Changeover Type: Manual.
EMERSON
EMERSON Low Voltage Thermostat: Heat or Cool, Manual, C/E/G/L/O/B6/R/W2/Terminal Designations (MPN 1F83H-21NP). Key specifications — Application: Heat or Cool; Key Features: Temperature Limits; Temperature Differential: 0.5° to 1.2°F; Voltage: 20V AC; Terminal Designations: C; System Settings: Cool-Heat-Off; Temperature Control Range: 45° to 99°F; Changeover Type: Manual.
EMERSON Low Voltage Thermostat: Heat or Cool, Manual, C/G/RC/RH/W/YO/B, Auto-On, Cool-Heat-Off (MPN 1F83C-11NP). Key specifications — Application: Heat or Cool; Key Features: Temperature Limits; Temperature Differential: 0.5° to 1.2°F; Voltage: 20V AC; Terminal Designations: YO/B; System Settings: Cool-Heat-Off; Temperature Control Range: 45° to 99°F; Changeover Type: Manual.
EMERSON
EMERSON Low Voltage Thermostat: Heat or Cool, Manual, C/G/RC/RH/W/YO/B, Auto-On, Cool-Heat-Off (MPN 1F83C-11NP). Key specifications — Application: Heat or Cool; Key Features: Temperature Limits; Temperature Differential: 0.5° to 1.2°F; Voltage: 20V AC; Terminal Designations: YO/B; System Settings: Cool-Heat-Off; Temperature Control Range: 45° to 99°F; Changeover Type: Manual.
EMERSON Low Voltage Thermostat: Heat and Cool, Auto, Auto, Auto, Auto/Auto, Horizontal, Rectangle (MPN 1F85U-22NP). Key specifications — Application: Heat and Cool; Key Features: Built-In Level; Temperature Differential: 0.5° to 1.2°F; Voltage: 20V AC; Terminal Designations: RH; System Settings: Auto; Temperature Control Range: 45° to 99°F; Changeover Type: Automatic.
EMERSON
EMERSON Low Voltage Thermostat: Heat and Cool, Auto, Auto, Auto, Auto/Auto, Horizontal, Rectangle (MPN 1F85U-22NP). Key specifications — Application: Heat and Cool; Key Features: Built-In Level; Temperature Differential: 0.5° to 1.2°F; Voltage: 20V AC; Terminal Designations: RH; System Settings: Auto; Temperature Control Range: 45° to 99°F; Changeover Type: Automatic.
EMERSON Low Voltage Thermostat: Heat or Cool, Manual, B/C/G/O/RC/RH/W/Terminal Designations, Auto-On (MPN 01F86 344). Key specifications — Application: Heat or Cool; Key Features: Permanent Program Retention During Power Loss; Temperature Differential: 0.6° to 1.5°F; Voltage: 20V AC; Terminal Designations: Y; System Settings: Cool-Heat-Off; Temperature Control Range: 45° to 99°F; Changeover Type: Manual.
EMERSON
EMERSON Low Voltage Thermostat: Heat or Cool, Manual, B/C/G/O/RC/RH/W/Terminal Designations, Auto-On (MPN 01F86 344). Key specifications — Application: Heat or Cool; Key Features: Permanent Program Retention During Power Loss; Temperature Differential: 0.6° to 1.5°F; Voltage: 20V AC; Terminal Designations: Y; System Settings: Cool-Heat-Off; Temperature Control Range: 45° to 99°F; Changeover Type: Manual.
EMERSON Low Voltage Thermostat: Heat and Cool, Auto, Auto, Auto, Auto/Auto, Horizontal, Rectangle (MPN 1F85U-42NP). Key specifications — Application: Heat and Cool; Key Features: Temperature Limits; Temperature Differential: 0.5° to 1.2°F; Voltage: 30V AC; Terminal Designations: Y2; System Settings: Auto; Temperature Control Range: 45° to 99°F; Changeover Type: Automatic.
EMERSON
EMERSON Low Voltage Thermostat: Heat and Cool, Auto, Auto, Auto, Auto/Auto, Horizontal, Rectangle (MPN 1F85U-42NP). Key specifications — Application: Heat and Cool; Key Features: Temperature Limits; Temperature Differential: 0.5° to 1.2°F; Voltage: 30V AC; Terminal Designations: Y2; System Settings: Auto; Temperature Control Range: 45° to 99°F; Changeover Type: Automatic.
EMERSON Low Voltage Thermostat: Heat or Cool, Manual, B/G/O/RC/RH/W/Terminal Designations, Auto-On (MPN 01F78 144S1). Key specifications — Application: Heat or Cool; Key Features: Selectable Celsius or Fahrenheit Temperature Display; Temperature Differential: 0.8° to 1.5°F; Voltage: 30V AC; Terminal Designations: Y; System Settings: Cool-Heat-Off; Temperature Control Range: 45° to 99°F; Changeover Type: Manual.
EMERSON
EMERSON Low Voltage Thermostat: Heat or Cool, Manual, B/G/O/RC/RH/W/Terminal Designations, Auto-On (MPN 01F78 144S1). Key specifications — Application: Heat or Cool; Key Features: Selectable Celsius or Fahrenheit Temperature Display; Temperature Differential: 0.8° to 1.5°F; Voltage: 30V AC; Terminal Designations: Y; System Settings: Cool-Heat-Off; Temperature Control Range: 45° to 99°F; Changeover Type: Manual.
EMERSON Low Voltage Thermostat: Heat or Cool, Manual, C/G/O/B/R/W/Terminal Designations, Auto-On (MPN 1F86EZ-0251). Key specifications — Application: Heat or Cool; Key Features: Change Filter Reminders; Temperature Differential: 0.6° to 1.7°F; Voltage: 20V AC; Terminal Designations: C; System Settings: Cool-Heat-Off; Temperature Control Range: 45° to 99°F; Changeover Type: Manual.
EMERSON
EMERSON Low Voltage Thermostat: Heat or Cool, Manual, C/G/O/B/R/W/Terminal Designations, Auto-On (MPN 1F86EZ-0251). Key specifications — Application: Heat or Cool; Key Features: Change Filter Reminders; Temperature Differential: 0.6° to 1.7°F; Voltage: 20V AC; Terminal Designations: C; System Settings: Cool-Heat-Off; Temperature Control Range: 45° to 99°F; Changeover Type: Manual.