Braeburn 1220NC Thermostat Operation Manual

The Braeburn 1220NC is a non-programmable thermostat designed for single-stage heat/cool conventional and heat pump systems, including up to 2 heat/1 cool conventional systems, single compressor heat pump systems with auxiliary heat, and 250–750 millivolt heat-only systems. It features a large display with bright blue backlight, easy operation, and precise temperature control, ideal for residential applications. 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. Temperature Display Adjustment 2.4. Troubleshooting 3. Installation Instructions 3.1. Remove Old Thermostat 3.2. Installing New Thermostat 3.3. Battery Location 3.4. Power Options

Key Specifications

Type: Non-programmable thermostat
Compatibility:
- Single-stage heat/cool conventional and heat pump systems
- Conventional systems up to 2 heat/1 cool
- Single compressor heat pump systems with auxiliary heat stage
- 250–750 millivolt heat-only systems
- Not compatible with multi-stage systems beyond specifications or systems exceeding 30 VAC
Power Source:
- Battery: Two "AA" alkaline batteries (included), 3.0 Volt DC
- Hardwired: 18-30 VAC with common (C) wire
Electrical Rating:
- Terminal Load: 1 amp maximum per terminal
- Setpoint Range: 45°F to 90°F (7°C to 32°C)
- Accuracy: +/- 1°F (+/- 0.5°C)
Display: Large LCD display with bright blue backlight, status indicators
Operating Conditions:
- Ambient: 32°F to 105°F (0°C to 41°C)
- Humidity: 90% non-condensing max
Dimensions: 3.70” H x 5.16” W x 1.38” D
Features:
- Large easy-to-read display with backlight
- Adjustable temperature differentials
- Automatic compressor short cycle protection
- Low battery indicator
- Permanent memory retains settings
- Separate O/B terminals for heat pumps
Thermostat Configuration Options:
- Conventional or Heat Pump systems
- Fahrenheit or Celsius display
- Gas or Electric heat
- 1st and 2nd stage differentials

Operation Instructions

Initial Setup

1. Insert Batteries: Install two "AA" alkaline batteries in the rear compartment, ensuring correct polarity.
2. Power On: If hardwired, connect 18-30 VAC to the C terminal. The display should show the current temperature.
3. Configure System:

Set installer switches on the back: CONV/HP for system type, F/C for temperature units, HG/HE for gas/electric heat.
Press RESET after changes.
Access user options by holding UP/DOWN arrows for 3 seconds to set 1st stage differential (0.5, 1.0, 2.0°F) and 2nd stage (1.0-6.0°F).

Operating the Thermostat

1. Select Mode: Use SYSTEM switch to choose COOL, OFF, HEAT, or EMER (for heat pumps).
2. Fan Mode: Use FAN switch to choose AUTO or ON.
3. Adjust Temperature: Press UP/DOWN arrows to set desired temperature.
4. Verify Operation: In HEAT, set above room temp; heating indicator displays. In COOL, set below; cooling indicator displays. Do not short terminals to test. Compressor protection delays operation; press RESET to bypass (resets defaults).
Note: Do not select COOL if outside temp below 50°F. EMER flashes "NO EMER SET" if conventional.

Temperature Display Adjustment

Adjust temperature scale (°F/°C) via installer switches. Set differentials in user options by holding UP/DOWN for 3 seconds. No specific calibration; use a separate thermometer to verify. Relocate if near drafts or heat sources.

Troubleshooting

No Display: Check battery polarity or replace batteries. Verify 24V power if hardwired. Press RESET.
No Heat/Cool: Ensure mode correct, setpoint appropriate, power on. Check wiring, breakers. For heat pumps, try EMER.
Fan Runs Constantly: Set FAN to AUTO.
Inaccurate Temperature: Ensure proper location. Adjust differentials.
Erratic Operation: Reset thermostat. Check voltage.
Low Battery: Replace batteries.
Buttons Not Working: Replace batteries and reset. Visit braeburnonline.com for more tips.

Installation Instructions

Warning: Disconnect power before installation to prevent shock or damage. For experienced technicians only. Conform to local codes. Do not short terminals to test.

Remove Old Thermostat

Turn off power. Remove old thermostat, label wires for terminals. Handle mercury thermostats carefully and dispose properly.

Installing New Thermostat

Separate thermostat from sub-base.
Mount sub-base on wall, mark/drill holes, use anchors if needed.
Connect wires to terminals per system (e.g., Rc/Rh power, W1/E heat, Y1 cool, W2 2nd heat, O/B reversing valve, G fan, C common).
Set installer switches (CONV/HP, F/C, HG/HE).
Push excess wire back, plug hole with insulation.
Snap thermostat onto sub-base. Insert quick reference card.

Battery Location

Batteries in rear housing. Replace when low indicator shows. Use alkaline "AA" batteries, correct polarity.
If unoccupied long, replace batteries before leaving.

Power Options

Use 24V AC primary with batteries backup, or batteries only.

Thermostat Power Method	Description
Battery Powered	Runs on two "AA" batteries.
Hardwired with Battery Backup	Runs on 18-30V AC with batteries backup.

Caution: Correct battery polarity. No shorting terminals.