White Rodgers 1F83-277 Thermostat Installation and Operation

Important Safety Information

Operator: Save these instructions for future use!

FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL INJURY AND/OR PROPERTY DAMAGE.

CAUTION: To prevent electrical shock and/or equipment damage, disconnect electric power to the system at the main fuse or circuit breaker box until installation is complete.

ATTENTION Regarding Mercury: This product does not contain mercury. However, it may replace a unit that does. Do not open mercury cells. If a cell becomes damaged, do not touch spilled mercury. Clean up spilled mercury with non-absorbent gloves and place in a sealed container. Discard damaged units. Mercury must not be discarded in household trash. Refer to www.white-rodgers.com for proper disposal instructions for products containing mercury.

Preparations and Removal of Old Thermostat

Tools Required:

• Flat Blade Screwdriver
• Wire Cutter/Stripper
• Hand or Power Drill with 3/16 inch Drill Bit (if needed)

Thermostat Replaces:

Removing Old Thermostat:

Before removing wires from the old thermostat's switching sub-base, label each wire with its terminal designation.

1. Shut off electricity at the main fuse box. Ensure power is disconnected.
2. Remove the old thermostat cover (snap-on or hinge type).
3. Remove the base by loosening captive screws.
4. Remove the switching subbase by unscrewing mounting screws.
5. Remove the front cover of the old thermostat. With wires attached, remove the wall plate. If a wall mounting plate is present, remove it with the thermostat.
6. Identify each wire attached to the old thermostat.
7. Disconnect wires one at a time. DO NOT LET WIRES FALL BACK INTO THE WALL.
8. Proceed with installing the new thermostat.

Figure 1 shows a diagram of the thermostat base with terminals labeled (e.g., R, C, Y1, G, O, B, W2, E/W1, L) and an Elec-Gas switch.

Mounting and Wiring

WARNING: Do not use on circuits exceeding specified voltage. Higher voltage will damage the control and could cause shock or fire hazard. Do not short out terminals on gas valve or primary control to test. Short or incorrect wiring will damage the thermostat and could cause personal injury and/or property damage. Thermostat installation and all system components must conform to Class II circuits per NEC code.

CAUTION: Secure and route wires carefully to prevent shorting to adjacent terminals or the rear of the thermostat. Personal injury and/or property damage may occur.

Attach Thermostat Base to Wall:

1. Remove packing material. Gently pull the cover straight off the base.
2. Connect wires beneath terminal screws on the base according to the appropriate wiring schematic (see Figures 2-4).
3. Place the base over the wall opening and mark mounting hole locations.
4. Drill mounting holes.
5. Fasten the base loosely to the wall with two mounting screws. Use a level to ensure it is straight, then tighten screws. (Leveling is for appearance only). Use plastic screw anchors if holes are too large.
6. Push excess wire into the wall and plug the hole with fire-resistant material (like fiberglass insulation) to prevent drafts.

Electric/Gas Switch (Fan Option):

This thermostat is factory-configured for heat/cool, fossil fuel (gas, oil, etc.), forced air systems that do NOT require the thermostat to energize the fan on a call for heat. For electric heat or heat-pump systems that REQUIRE fan control on a heat call, switch the ELEC/GAS switch on the back of the thermostat to the ELEC position. This energizes the fan immediately on a heat call. If unsure, consult a qualified HVAC service person. For Heat Pump systems, the thermostat always powers the fan on a heat call in HEAT mode. The ELEC/GAS switch setting must match the auxiliary heat type for proper EMERgency mode operation.

Refer to equipment manufacturers' instructions for specific system wiring.

Battery Location:

The thermostat includes 2 "AA" alkaline batteries, with a battery tag to prevent power drainage. Remove the tag to activate batteries. If "BATT" is displayed, batteries are low and need replacement. For best results, use premium alkaline batteries. To replace batteries, set the system to OFF, then install batteries along the top of the base with the positive (+) end to the left.

Wiring Diagrams:

All wiring diagrams are for typical systems. Refer to equipment manufacturers' instructions for specific wiring.

• Figure 2: Typical wiring diagram for single transformer heat pump systems. It shows connections between thermostat terminals and system components like reversing valve, compressor, fan, and heat relays, powered by a 24 VAC transformer. The note mentions that the 24 VAC neutral connection to terminal C is not required if batteries are replaced annually.
• Figure 3: Typical wiring diagram for two transformer heat pump systems with NO safety circuits. It includes a note about jumping two commons together if using two transformers and removing one transformer if safety circuits are only in one system. It also shows connections to a 24 VAC transformer and a 120 VAC transformer.
• Figure 4: Typical wiring diagram for two transformer heat pump systems with safety circuits in BOTH systems. It details connections involving an accessory relay and two transformers (Auxiliary Heating and Heat Pump). It emphasizes the need to jump commons together and notes polarity must be observed to avoid shorts.
• Figure 5: Typical wiring diagram for single transformer multi-stage systems, showing connections to thermostat terminals and system components like compressor and fan relays.

Heat Pump and Multi-Stage Terminal Outputs

This thermostat is designed for single-transformer systems. For two-transformer systems, cut and tape off one transformer. If safety circuits are in only one system, remove that transformer. Replace the remaining transformer with a 75VA Class II transformer if needed. Ensure the two commons are jumpered together after disconnecting one transformer.

Use the terminal output information below for wiring your system. Refer to the CONFIGURATION section for proper thermostat configuration.

THERMOSTAT TERMINALS (HEAT PUMP)

*The 24 volt neutral connection to terminal C is not required if batteries are replaced annually.

THERMOSTAT TERMINALS (MULTI-STAGE)

*The 24 volt neutral connection to terminal C is not required if batteries are replaced annually.

Checking Thermostat Operation

NOTE: To prevent static discharge problems, touch the side of the thermostat to release static build-up before touching any keys.

If the system does not operate properly during testing, contact a qualified service person.

Fan Operation:

If your system does not have a G terminal connection, skip to Heating System.

1. Turn on system power.
2. Move FAN switch to ON. The blower should operate.
3. Move FAN switch to AUTO. The blower should stop immediately.

CAUTION: Do not allow the compressor to run unless its oil heaters have been operational for 6 hours and the system has not been operational for at least 5 minutes.

Heating System:

1. Press SYSTEM button to select the Flame icon (?). If the auxiliary heating system has a standing pilot, light it.
2. Press ⬆ to adjust the thermostat setting 1° above room temperature. The heating system should begin to operate, displaying "STG1". If the setpoint display flashes, the compressor lockout feature is active (see Configuration menu, item 5).
3. Adjust the temperature setting 3° above room temperature. If your system is configured for MS2, HP2, or HP1, the auxiliary heat system should operate, displaying "STG1+2".
4. Press ⬇ to adjust the thermostat below room temperature. The heating system should stop operating.

Emergency System:

The EMER mode bypasses the Heat Pump to use the heat source wired to terminal E. It's typically used when compressor operation is not desired or for backup heat only.

1. Press SYSTEM button to select EMER. "EMER" will flash on the display.
2. Press ⬆ to adjust the thermostat setting above room temperature. The auxiliary heating system will begin to operate, displaying "STG1" flashing "EMER" with the Flame icon (?).
3. Adjust the temperature setting 3° above room temperature. The auxiliary heat system should operate, displaying "STG1+2".
4. Press ⬇ to adjust the thermostat below room temperature. The auxiliary heating system should stop operating.

CAUTION: To prevent compressor and/or property damage, DO NOT operate the cooling system if the outdoor temperature is below 50°F.

Cooling System:

1. Press SYSTEM button to select the Snowflake icon (❄️).
2. Press ⬇ to adjust the thermostat setting below room temperature. The blower should start on high speed, followed by cold air circulation, displaying "STG1".
3. Adjust the temperature setting 3° below room temperature. The second stage cooling should begin to operate, displaying "STG1+2".
4. Press ⬆ to adjust the temperature setting above room temperature. The cooling system should stop operating.

Operation

The system mode (COOL ❄️, AUTO ?❄️, HEAT ?, EMER, OFF) is selected using the SYSTEM button. The current temperature is displayed on the left, and the setpoint temperature on the right (blank when OFF). In AUTO mode, the heat setpoint must be at least 1° lower than the cool setpoint.

Automatic System Changeover:

In AUTO mode, both Flame (?) and Snowflake (❄️) icons are displayed. The thermostat calls for heat or cool based on room temperature. The displayed setpoint reflects the last mode called.

Second Stage Time Delay:

The thermostat determines the optimal time to activate the second stage. Raising/lowering temperature manually may not immediately trigger the second stage. There is a 0-30 minute delay based on first-stage performance. The system optimizes staging to maintain temperature efficiently.

Low Battery Indicator:

When 2 "AA" batteries are low, "LO BATT" is displayed. Replace batteries every 2 years or before extended absences. Low batteries allow setpoint override but not programming. After 4 weeks of low battery indication, the thermostat may adjust temperature by 10° or eventually turn off all loads, flashing "LO BATT".

Thermostat Buttons and Switches:

• 1. ⬆: Raises temperature setting.
• 2. ⬇: Lowers temperature setting.
• 3. FAN switch: (ON, AUTO) Controls fan operation.
• 4. SYSTEM button: Selects mode (COOL, AUTO, HEAT, EMER, OFF).

Display Indicators:

• 5. Flame icon (?): HEAT mode.
• 5. Snowflake icon (❄️): COOL mode.
• 5. Flame & Snowflake icons: AUTO mode.
• 6. "BATT": Batteries are low.
• 7. Current temperature: Displayed on the left.
• 8. Set temperature: Displayed on the right (blank when OFF).
• 9. "FLTR": Filter replacement reminder.
• 10. Lock icon (?): Keypad lockout mode.
• 11. "EMER" flashing: EMER mode active.
• 12. "FAULT": System malfunction.
• 13. "L" icon: Limited HEAT/COOL range active. Flashes if attempt is made to adjust beyond range.
• 14. STG 1 / STG1+2: Indicate first and second stage operation.

Configuration Menu

Access the configuration menu by setting the SYSTEM button to OFF, then simultaneously pressing the ⬆ and ⬇ buttons. The display will show the first menu item. Press SYSTEM to advance to the next item. Press RUN to exit and return to normal operation. The menu times out after fifteen minutes of inactivity.

Configuration Options Table:

Configuration Details:

• Compressor Lockout (CL ON): Waits 5 minutes before turning on the compressor after power loss or between cycles to prevent short cycling. Consult compressor manufacturer if unsure.
• Backlight Display: Improves contrast. "CDL ON" keeps light on continuously. "CDL OFF" keeps light on momentarily after key press. Requires C terminal power.
• Fast Second Stage (FA ON/OFF): Controls when the second stage activates. "FA ON" activates it with a 3°F difference; "FA OFF" requires a 1°F difference for 10 minutes.
• Filter Replacement Run Time: Sets a reminder ("FLTR") for filter changes. Can be set from 0 to 1950 hours (50-hour increments). Setting to 000 cancels the feature.
• Temperature Display Adjustment: Adjusts the displayed room temperature by +/- 4 degrees.
• F° or C° Readout: Selects Fahrenheit or Celsius display.
• Selected Auto Mode: Enables AUTO changeover mode when "AU On". Set to "OFF" to disable.
• Limited Heat Range: Sets maximum heat setpoint (default 90°F, adjustable 62°F-89°F).
• Limited Cool Range: Sets minimum cool setpoint (default 45°F, adjustable 46°F-82°F).
• Keypad Lockout: Prevents unauthorized changes. Can be set to ON with a combination code (0-999). To enter configuration menu with lockout active, press ⬆ and ⬇ simultaneously. To reset a forgotten code, use the reset operation described in Troubleshooting.

Specifications

Electrical Data:

• Electrical Rating: 20 to 30 VAC 50/60 Hz or DC
• Load per terminal: 0.05 to 1.5 Amps
• Maximum Total Load (All terminals combined): 2.5 Amps

Thermal Data:

• Setpoint Temperature Range: 45°F to 90°F (7°C to 32°C)
• Operating Ambient Temperature Range: 32°F to 105°F
• Operating Humidity Range: 0 to 90% RH (non-condensing)
• Shipping Temperature Range: -40°F to 150°F

Troubleshooting

Reset Operation:

If the display blanks or operation becomes erratic due to voltage spikes or static discharge, reset the thermostat by removing wires from R and C terminals and removing batteries for 2 minutes. Reinstall wires and batteries. If issues persist, contact your service person or place of purchase.

Troubleshooting Guide:

FAQ:

• My thermostat is reading in Celsius. How do I change it to Fahrenheit? Your thermostat display can be set to Fahrenheit or Celsius in the INSTALLER/CONFIGURATION MENU (See page 6, step 12).
• My display light does not work. Can it be fixed or replaced? No, because it is soldered to the circuit board.
• My setpoint temperature is flashing. What does that mean? This indicates the thermostat's compressor time delay is active, typically for about five minutes, to protect the compressor from short cycling.
• How can I get a copy of the Operating Manual for my thermostat? Visit www.white-rodgers.com for operating manuals.