Emerson 1F85U-42NP Non-Programmable Thermostat User Manual

Introduction

This manual provides comprehensive instructions for the installation, operation, and maintenance of your Emerson 1F85U-42NP Non-Programmable Thermostat. Please read this manual thoroughly before installation and use to ensure proper function and safety.

Key Features

• Large, clear display for easy readability in various lighting conditions.
• Simplified installation with a built-in level indicator and pluggable terminals.
• Advanced features including keypad lockout, temperature limits, and a backlight button.
• Dual fuel standard compatibility without requiring additional sensors.
• Non-programmable operation for straightforward temperature control.

Package Contents

Verify that all items are present in your package:

• Emerson 1F85U-42NP Thermostat
• User Manual (this document)
• 2 AA Batteries
• Mounting Screws and Wall Anchors

Image: Contents of the Emerson 1F85U-42NP thermostat package, showing the thermostat unit, two AA batteries, mounting screws, and the instruction manual.

Installation

Important Safety Information: Before beginning installation, turn off power to the heating and cooling system at the main fuse or circuit breaker panel. Failure to do so could result in electrical shock or equipment damage.

1. Remove Old Thermostat:
   • Turn off power to the HVAC system.
   • Carefully remove the cover of your old thermostat.
   • Take a picture of the wiring connections for reference. Label each wire with the terminal designation (e.g., R, W, Y, G, C).
   • Disconnect the wires and remove the old thermostat base from the wall.
2. Mount New Thermostat Base:
   • Position the new thermostat base on the wall. Use the built-in level indicator to ensure it is straight.
   • Mark the mounting holes. Drill pilot holes if necessary.
   • Secure the thermostat base to the wall using the provided screws and wall anchors.
3. Wire the Thermostat:
   • Connect the labeled wires to the corresponding terminals on the new thermostat base. Refer to the wiring diagram in the included user manual for specific connections based on your HVAC system type (Conventional Gas/Oil, Electric, Heat Pump).
   • Ensure all wire connections are secure.
4. Install Batteries:
   • Insert the two AA batteries into the battery compartment, observing polarity (+/-).
5. Attach Thermostat to Base:
   • Carefully align the thermostat unit with the mounted base and snap it into place.
6. Restore Power:
   • Turn the power back on at the main fuse or circuit breaker panel.

Image: Front view of the Emerson 1F85U-42NP thermostat, showing the digital display with time, room temperature, and set temperature, along with system and fan mode buttons.

Initial Setup and Configuration

After installation and power-up, the thermostat may require initial configuration. Refer to the detailed configuration menu instructions in the full user manual for specific settings such as system type (e.g., conventional, heat pump) and temperature calibration.

1. System Type Selection: Access the installer menu (usually by holding a combination of buttons) to select your heating and cooling system type. Incorrect selection can lead to improper operation.
2. Temperature Display: The thermostat displays the current room temperature. Use the Up and Down arrow buttons to adjust the desired set temperature.
3. Backlight: The display backlight activates when any button is pressed, improving visibility in low light conditions.

Operation

The Emerson 1F85U-42NP thermostat is designed for simple, non-programmable operation.

Adjusting Temperature

• Use the Up Arrow button to increase the desired temperature.
• Use the Down Arrow button to decrease the desired temperature.
• The display will show both the current room temperature and the set temperature.

System Mode Selection

Press the System button to cycle through available modes:

• Heat: Activates the heating system when the room temperature falls below the set temperature.
• Off: Turns off both heating and cooling systems.
• Cool: Activates the cooling system when the room temperature rises above the set temperature.
• Auto: Automatically switches between heating and cooling to maintain the set temperature range. (Availability depends on system configuration).
• Aux/Emer: Auxiliary/Emergency heat mode for heat pump systems.

Fan Mode Selection

Press the Fan button to cycle through available modes:

• Auto: The fan runs only when the heating or cooling system is actively operating.
• On: The fan runs continuously, regardless of whether the heating or cooling system is active.

Keypad Lockout

This feature prevents unauthorized changes to thermostat settings. Refer to the full user manual for instructions on how to activate and deactivate keypad lockout.

Temperature Limits

The thermostat allows setting minimum and maximum temperature limits to prevent the system from operating outside a desired range. Consult the full user manual for details on configuring temperature limits.

Maintenance

Battery Replacement

The thermostat uses two AA alkaline batteries. A low battery indicator will appear on the display when batteries need to be replaced. Replace batteries promptly to ensure continuous operation.

1. Gently pull the thermostat unit off its wall-mounted base.
2. Remove the old batteries and dispose of them properly.
3. Insert two new AA alkaline batteries, ensuring correct polarity.
4. Snap the thermostat unit back onto its base.

Cleaning

To clean the thermostat, gently wipe the exterior with a soft, damp cloth. Do not use abrasive cleaners or solvents. Avoid spraying liquids directly onto the thermostat.

Troubleshooting

If you continue to experience issues, please consult the complete user manual or contact Emerson customer support.

Specifications

Warranty and Support

For warranty information and technical support, please contact Emerson Climate Technologies directly. Details regarding warranty coverage and service procedures are typically provided with the product packaging or can be found on the manufacturer's official website.

Manufacturer: Emerson Climate Technologies

Please retain your proof of purchase for warranty claims.