Emerson 1F85-0422 Thermostat Operation Manual

The Emerson 1F85-0422 is a Blue 4-Inch Universal Thermostat designed for single-stage, multi-stage, or heat pump systems, offering programmable (5+1+1 day, 5+2 day) or non-programmable modes. It features a large backlit display, automatic heat/cool changeover, and easy installation. Below are the key specifications and operation instructions.

1. Key Specifications 2. Operation Instructions 2.1. Initial Setup 2.2. Setting the Clock and Day 2.3. Operating in Non-Programmable Mode 2.4. Operating in Programmable Mode 2.5. Advanced Features 2.6. Troubleshooting 3. Installation Instructions 3.1. Remove Old Thermostat 3.2. Installing New Thermostat 3.3. Battery Location 3.4. Power Stealing Switches

Key Specifications

Type: Programmable (5+1+1 day, 5+2 day) or non-programmable, universal thermostat
Compatibility:
- Single-stage systems (gas, oil, electric)
- Multi-stage systems (up to 2H/1C)
- Heat pump systems (with or without auxiliary/emergency heat)
- Millivolt systems, hydronic zone heat (2 or 3 wires)
- Not compatible with systems exceeding 30 VAC or electric baseboard heat
Power Source:
- Battery: mV to 30 VAC, NEC Class II, 50/60 Hz or DC (2 AA alkaline batteries, Duracell or Energizer recommended)
- Hardwired: 20-30 VAC, NEC Class II, 50/60 Hz with common (C) wire
- Power Stealing Assist for systems without C wire
Electrical Rating:
- Terminal Load: 1.5 A per terminal, 2.5 A max combined
- Rated Differentials (@ 6°F/Hr):
  - Heat (Single Stage): 0.6°F
  - Cool (Single Stage): 1.2°F
  - Heat Pump (Heat/Cool): 1.2°F
- Setpoint Range: 45°F to 90°F (7°C to 32°C)
Display: 4-square-inch backlit LCD with improved contrast
Operating Conditions:
- Ambient: 32°F to 105°F (0°C to 41°C)
- Humidity: 90% non-condensing max
- Shipping: -4°F to 150°F (-20°C to 65°C)
Dimensions: 3-7/8” H x 5-1/8” W x 1-1/4” D
Features:
- 5+1+1 day or 5+2 day programmable scheduling
- Automatic heat/cool changeover
- Energy Management Recovery (EMR)
- Compressor protection (up to 5-minute delay)
- Keypad lockout and setpoint temperature limits
- Battery power monitor
- Exclusive Cool Savings for energy efficiency
- Wall plate (F61-2634) included
Thermostat Configuration Options:
- Single Stage (SS1): Gas, Oil, Electric, Heat Only, Cool Only or Heat/Cool Systems, 2 or 3 wire Hydronic Zone Systems, 24 Volt or Millivolt - Maximum Stages Heat/Cool: 1/1
- Multi Stage (MS2): Gas, Oil, Electric - Maximum Stages Heat/Cool: 2/2
- Heat Pump (HP): Single Stage Compressor with or without Auxiliary/Emergency Heat - Maximum Stages Heat/Cool: 2/1

Operation Instructions

Initial Setup

1. Insert Batteries: Install 2 AA alkaline batteries in the rear compartment by pulling the battery door down and lifting it open, removing the battery tag to activate. Replace when “Change” or battery icon appears (approximately every 2 years). If less than two months of battery life remain, the setpoint may offset by 10°F (cooler in Heat mode, warmer in Cool mode); reset manually with up/down arrows.
2. Power On: If hardwired, ensure 20-30 VAC is supplied via the C terminal. The display should show the home screen with room temperature, setpoint, and battery level.
3. Configure System:

Locate the GAS/ELECTRIC switch on the back of the thermostat (default: GAS). Set to ELECTRIC for systems requiring the thermostat to control the fan during heating (e.g., electric heat or heat pumps).
Locate the O/B switch (default: O). Set to O for heat pumps energizing the changeover relay in COOL, or B for energizing in HEAT.
Access INSTALLER/CONFIGURATION MENU by pressing MENU for at least 5 seconds while in HEAT, COOL, or AUTO mode.
Configure options:
- Item 1: Select SS (single-stage) or HP (heat pump).
- Item 2: Select O or B for heat pump changeover valve.
- Item 3: Program options (P3: 5+1+1 day, P2: 5+2 day, P0: non-programmable).
- Item 4: Cool Savings (0 to 6, 0 to disable).
- Item 5: Temperature display (°F or °C).
- Item 6: Filter replacement time (0 to 1950 hours, 0 to disable).
Exit by pressing RUN SCHED or waiting for the display to return to normal.

Setting the Clock and Day

1. Press MENU, then select SET TIME.
2. Use up/down arrows to adjust hours, minutes, and AM/PM.
3. Select SET DAY and adjust to the current day of the week.
4. Press RUN SCHED to save and exit.

Operating in Non-Programmable Mode

1. Select Mode: Press SYSTEM to choose HEAT, COOL, AUTO, or OFF. For heat pumps, EMER mode is available for auxiliary heat.
2. Adjust Temperature: Press up/down arrows to set the desired temperature.
3. Fan Control: Press FAN to select AUTO (runs with heating/cooling) or ON (continuous).
4. Manual Operation: Press HOLD to maintain a constant temperature, bypassing any programmed schedule. Press RUN SCHED to resume programming if previously set. To reset programming, clock, and configuration, press up/down arrows and FAN simultaneously until the display blanks.

Operating in Programmable Mode

1. Factory Schedule: The thermostat is pre-programmed with energy-saving settings (e.g., Heat: 70°F day, 62°F night; Cool: 78°F day, 82°F night). Press RUN SCHED to use defaults.
2. Custom Schedule:

Press MENU, then SET SCHEDULE, and select HEAT or COOL.
Choose 5+1+1 (Mon-Fri, Sat, Sun) or 5+2 (Mon-Fri, Sat-Sun) programming.
Set times/temperatures for Morning, Day, Evening, Night periods for each day/group using up/down arrows.
Save by pressing RUN SCHED.

3. Temporary Override: Press up/down arrows to adjust temperature temporarily until the next period; the display shows “Temporarily Set To.”
4. Permanent Hold: Press HOLD and adjust temperature to maintain it until RUN SCHED is pressed.
5. Disable Programming: Press MENU, hold MENU for 5 seconds, and set programming to P0 (non-programmable).

Advanced Features

1. Energy Management Recovery (EMR): Enable in INSTALLER/CONFIGURATION MENU to start heating/cooling early to reach the setpoint by the programmed time (15 minutes per 1°F).
2. Cool Savings: Enable in INSTALLER/CONFIGURATION MENU (Item 4, 0 to 6) to adjust temperature during peak A/C demand for energy savings; higher settings increase savings.
3. Compressor Protection: Automatically delays compressor restart (up to 5 minutes) to prevent damage, indicated by a flashing snowflake icon.
4. Keypad Lockout: Enable in INSTALLER/CONFIGURATION MENU to restrict access; unlock by pressing MENU and RUN SCHED simultaneously for 5 seconds.
5. Filter Change Reminder: Alerts when filter replacement is needed (0 to 1950 hours, set in Item 6); clear by pressing up/down arrows in INSTALLER/CONFIGURATION MENU.
6. Automatic Schedule: Press Auto Schedule key to copy a desired comfort temperature into all program periods with a 6°F setback for night periods (default: On for Heat and Cool).

Troubleshooting

No Display: Check battery polarity or replace with fresh AA alkaline batteries. Verify C wire connection for hardwired setups. Reset by pressing up/down arrows and FAN simultaneously until the display blanks. If the display remains blank, clean battery contacts with a pencil eraser or check for a blown fuse.
No Heat/Cool: Ensure SYSTEM is set to HEAT/COOL/EMER, setpoint is above/below room temperature, and circuit breaker is on. Check for compressor delay (up to 5 minutes, indicated by flashing snowflake icon). Verify wiring and O/B switch for heat pumps. If no click is heard within 5 minutes, check for blown fuse or tripped breaker.
Fan Runs Continuously: Set FAN to AUTO. Ensure SYSTEM is not in AUTO mode if only heating or cooling is desired. Check wiring for shorts in the G terminal.
Inaccurate Temperature: Calibrate in USER MENU (if available, ±4°F). Ensure thermostat is not near drafts, heat sources, or exterior walls (recommended placement: 1.5 meters above the floor, in a frequently used room).
“FILTER” Displayed: Indicates filter replacement needed; clear by pressing up/down arrows in INSTALLER/CONFIGURATION MENU (Item 6).
Erratic Operation: A voltage spike or static discharge may cause issues. Reset by pressing up/down arrows and FAN simultaneously. If the setpoint offsets by 10°F, replace batteries immediately. If issues persist, contact a professional technician at 1-800-284-2925.

Installation Instructions

Warning: Thermostat installation and all components of the control system shall conform to Class II circuits per the NEC code. To prevent electrical shock or equipment damage, disconnect power at the main fuse or circuit breaker before installation. If replacing a thermostat containing mercury, do not discard in household trash; follow local disposal regulations.

Remove Old Thermostat

Before removing wires, mark wires for terminal identification to ensure proper connections to the new thermostat. Take a picture of the wiring for reference. If the old thermostat contains mercury, wear non-absorbent gloves, clean up any spilled mercury, and place in a sealed container for proper disposal.

Installing New Thermostat

Pull the thermostat body off the thermostat base. Do not force or pry to avoid damage.
Place base over the hole in the wall and mark mounting hole locations using the base as a template.
Move base out of the way, drill mounting holes. Use plastic screw anchors if existing holes are too large.
Fasten base snugly to the wall using mounting holes and two mounting screws. Leveling is for appearance only and does not affect operation.
Connect wires to the terminal block on the base using the appropriate wiring schematic. For single-transformer systems, use RC and RH terminals with the provided jumper. For two-transformer systems, clip the jumper and connect RC and RH separately.
Push excess wire into the wall and plug the hole with fire-resistant material (e.g., fiberglass insulation) to prevent drafts.
Carefully line the thermostat up with the base and snap into place.

Battery Location

Includes 2 AA alkaline batteries at the factory with a battery tag to prevent power drainage. Remove the tag to engage batteries.
To replace, set system to OFF, remove thermostat from the wall, and install batteries in the rear along the top. Use premium brand AA alkaline batteries like Duracell or Energizer.
If the home will be unoccupied for over 3 months and the battery level indicator shows low, replace batteries before leaving.

Power Stealing Switches

Leave switches in the “On” position for most systems. Details in the following table:

Thermostat Power Method	Switch Position/Description
Battery Powered, no 24 Volt system	Switches “On”, thermostat runs on batteries.
Hardwired with Battery Back-up, for 24 Volt systems with common connection from transformer to “C” terminal	Switches “On”, thermostat runs on power directly from transformer with battery back-up.
Battery Powered with Power Stealing Assist, for 24 Volt systems with no common connection	Switches “On”, thermostat runs on batteries and supplemental power drawn through heat or cool circuit.

Caution: Power Stealing Assist may cause issues on systems with high impedance electronic modules (e.g., furnace draft inducer motor running with no call for heat, furnace fan not turning off). If incompatible, set switches to “Off” to operate on batteries.