Emerson 1F56W-911 Thermostat Operation Manual

The Emerson 1F56W-911 is a low-voltage, non-programmable thermostat designed for single-stage heating and cooling systems, including conventional gas, oil, electric, or millivolt systems, as well as single-stage heat pumps without auxiliary heat. It features a sensitive spiral bimetal for temperature control, an adjustable heating anticipator, and a fixed cooling anticipator for optimal comfort. Below are the key specifications and operation instructions.

1. Key Specifications 2. Operation Instructions 2.1. Initial Setup 2.2. Operating the Thermostat 2.3. Adjusting Heat Anticipator 2.4. 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: Non-programmable, single-stage thermostat
Compatibility:
- Conventional systems (gas, oil, electric, millivolt, 24V)
- Single-stage heat pump systems without auxiliary heat
- Standard heating and cooling systems (4 or 5 wires)
- Not compatible with multi-stage systems, electric baseboard heat, or systems exceeding 30 VAC
Power Source:
- Hardwired: 20-30 VAC, NEC Class II, 50/60 Hz with common (C) wire (optional)
- No battery required
Electrical Rating:
- Terminal Load: 0.05 to 1.0 A per terminal, 1.5 A max combined
- Rated Differentials: Heat (0.6°F), Cool (1.2°F)
- Setpoint Range: 45°F to 90°F (7°C to 32°C)
Display: Analog display with temperature scale
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: 3-1/4” H x 5-1/2” W x 1-1/2” D
Features:
- Sensitive spiral bimetal for precise temperature control
- Adjustable heating anticipator
- Fixed cooling anticipator
- Horizontal mounting with snap-action mechanism
Thermostat Configuration Options:
- Conventional Gas, Oil, Electric (mV and 24V), Heat Only, Cool Only, or Heat/Cool Systems - Maximum Stages Heat/Cool: 1/1
- Single-Stage Heat Pump without Aux. Heat - Maximum Stages Heat/Cool: 1/1

Operation Instructions

Initial Setup

1. Power On: Ensure 20-30 VAC is supplied via the system’s transformer. The thermostat does not require batteries.
2. Configure System:

Locate the anticipator adjustment on the thermostat base. Set the heating anticipator to match the furnace control’s current draw (typically 0.2 to 1.0 A, check system documentation).
For heat pumps, ensure the O/B terminal is configured correctly (O for cool, B for heat) based on system requirements.

Operating the Thermostat

1. Select Mode: Move the system switch to HEAT, COOL, or OFF.
2. Adjust Temperature: Rotate the temperature dial to set the desired temperature.
3. Fan Control: Move the fan switch to AUTO (runs with heating/cooling) or ON (continuous).
4. Verify Operation:

In HEAT mode, set the dial 1°F above room temperature; a click should be heard, and the heating system should start.
In COOL mode, set the dial 1°F below room temperature; a click should be heard, and the cooling system should start after a possible 5-minute compressor delay.

Adjusting Heat Anticipator

1. Locate the adjustable heat anticipator on the thermostat base (pointer and scale).
2. Check the furnace control’s primary current draw (in amperes, typically on the gas valve or control board).
3. Adjust the anticipator pointer to match the current draw (e.g., 0.4 A for gas systems, higher for electric). Move to a higher number for longer cycles, lower for shorter cycles.
4. Allow 24 hours to stabilize after adjustment.
Note: Incorrect settings may cause short cycling or wide temperature swings. Consult system documentation or a technician for precise settings.

Troubleshooting

No Heat/Cool: Ensure system switch is set to HEAT/COOL, temperature dial is above/below room temperature, and circuit breaker is on. Check for compressor delay (up to 5 minutes). Verify wiring connections. If no click is heard, check for blown fuse or tripped breaker.
Furnace Cycles Too Often: Adjust the heat anticipator to a higher setting for longer cycles. Ensure anticipator matches the system’s current draw.
Inaccurate Temperature: Relocate thermostat away from drafts, heat sources, or exterior walls. Calibration is not available; ensure proper placement.
Fan Runs Continuously: Set fan switch to AUTO. If issue persists, check wiring for shorts or incorrect connections.
Thermostat Not Responding: Verify power supply (20-30 VAC). Check for loose or incorrect wiring. If the thermostat is unresponsive, it may need replacement; contact a professional technician.
Wide Temperature Swings: Adjust heat anticipator to a lower setting for shorter cycles. Ensure thermostat is not near heat sources or drafts.

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 unsure about wiring (millivolt, line, or low voltage), consult a qualified technician.

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.

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 (refer to equipment manufacturer’s instructions).
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

No batteries are required; the thermostat operates on system power (20-30 VAC).
If power is interrupted, the thermostat will not function until power is restored.

Power Stealing Switches

Not applicable; the thermostat requires a direct power connection and does not support power stealing.

Thermostat Power Method	Switch Position/Description
Hardwired, for 24 Volt systems	Thermostat runs on power directly from the system transformer.

Caution: Ensure proper voltage (20-30 VAC) to avoid damage. Power stealing is not supported, and a common (C) wire may be required for some systems.