The White Rodgers 1F85-277 is a Heating & Air Conditioning 7 Day/5-1-1 Programmable/Non-programmable, Auto Changeover, Multi-Stage/Heat Pump Thermostat. It replaces systems including Heat Pump (No Aux. or Emergency Heat), Heat Pump (with Aux. or Emergency Heat), Standard Heat & Cooling Systems, Two Stage Heat & Two Stage Cool, Standard Heat Only Systems, Millivolt Heat Only Systems - Floor or Wall Furnaces, Standard Central Air Conditioning, Gas or Oil Heat, Electric Furnace, Hydronic (Hot Water) Zone Heat - 2 Wires (Hydronic (Hot Water) Zone Heat - 3 Wires not supported). Below are the key specifications, installation, operation, programming, and troubleshooting instructions.
Assemble tools required: hand or power drill with 3/16 inch flat blade screwdriver. To prevent electrical shock and/or equipment damage, disconnect electric power to system at main fuse or circuit breaker box until installation is complete. Before removing wires from old thermostat's switching sub-base, label each wire with the terminal designation it was removed from.
The White Rodgers 1F85-277 is a Heating & Air Conditioning 7 Day/5-1-1 Programmable/Non-programmable, Auto Changeover, Multi-Stage/Heat Pump Thermostat. It replaces systems including: Heat Pump (No Aux. or Emergency Heat), Heat Pump (with Aux. or Emergency Heat), Standard Heat & Cooling Systems, Two Stage Heat & Two Stage Cool, Standard Heat Only Systems, Millivolt Heat Only Systems - Floor or Wall Furnaces, Standard Central Air Conditioning, Gas or Oil Heat, Electric Furnace, Hydronic (Hot Water) Zone Heat - 2 Wires (Hydronic (Hot Water) Zone Heat - 3 Wires not supported).
ATTENTION! This product does not contain mercury. However, this product may replace a unit which contains mercury. Do not open mercury cells. If a cell becomes damaged, do not touch any spilled mercury. Wearing non-absorbent gloves, clean up the spilled mercury and place into a container which can be sealed. If a cell becomes damaged, the unit should be discarded. Mercury must not be discarded in household trash. When the unit this product is replacing is to be discarded, place in a suitable container and return to White Rodgers at 2895 Harrison Street, Batesville, AR 72501 for proper disposal.
Do not use on circuits exceeding specified voltage. Higher voltage will damage 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 thermostat and could cause personal injury and/or property damage. Thermostat installation and all components of the system shall conform to Class II circuits per the NEC code.
Take care when securing and routing wires so they do not short to adjacent terminals or rear of thermostat. Personal injury and/or property damage may occur.
If the outdoor temperature is below 50°F, DO NOT operate the cooling system.
To prevent compressor and/or property damage, if the outdoor temperature is below 50°F, DO NOT operate the cooling system.
Electric/Gas Switch (Fan Option): This thermostat is configured from the factory to operate a heat/cool, fossil fuel (gas, oil, etc.), forced air system. It is configured correctly for any system that DOES NOT require the thermostat to energize the fan on a call for heat. If your system is an electric heat or heat-pump system that REQUIRES the thermostat to turn on the fan on a call for heat, locate the ELEC/GAS switch on the back of the thermostat (see fig. 1) and switch it to the ELEC position. This will allow the thermostat to energize the fan immediately on a call for heat. If you are unsure if the heating/cooling system requires the thermostat to control the fan, contact a qualified heating and air conditioning service person. When the thermostat is configured for Heat Pump, the thermostat will always power the circulator fan on a call for heat in the HEAT mode. The ELEC/GAS switch must be set to match the type of Auxiliary heat your system uses for proper operation in the EMERgency mode.
All wiring diagrams are for typical systems only. Refer to equipment manufacturers' instructions for specific system wiring information. Reversing Valve Energized in Cool Mode. Reversing Valve Energized in Heat, Off, Emergency Mode.
Attach Thermostat Base to Wall:
Battery Location: 2 "AA" alkaline batteries are included in the thermostat at the factory with a battery tag to prevent power drainage. You must remove the battery tag to engage the batteries. If "BATT" is displayed, the batteries are low and should be replaced with fresh "AA" Energizer® alkaline batteries. To replace batteries, press system button to OFF, install the batteries along the top of the base (see Fig. 1). The batteries must be installed with the positive (+) end to the left. The 24 volt neutral connection to terminal C on the thermostat is not required if you replace the batteries once a year with fresh "AA" Energizer® alkaline batteries.
Figure 1 - Thermostat base (Mounting Hole, Elec-Gas Switch).
Figure 2 - Typical wiring diagram for single transformer heat pump systems (SYSTEM SWITCH, MONITOR, TRANSFORMER (Class II Current Limited)).
Figure 3 - Typical wiring diagram for two transformer heat pump systems with NO safety circuits (TWO COMMONS MUST BE JUMPERED TOGETHER!, Reversing Valve, 2nd Stage, Compressor, etc.).
Figure 4 - Typical wiring diagram for two transformer heat pump systems with safety circuits in BOTH systems (TWO COMMONS MUST BE JUMPERED TOGETHER!, Heat Pump Transformer (Class II Current Limited)).
Figure 5 - Typical wiring diagram for single transformer multi-stage systems (24 V_(class ii, Current Limited)).
Heat Pump Terminal Outputs
Refer to equipment manufacturers' instructions for specific system wiring information. You can configure the thermostat for use with the following heat pump system types:
HEAT PUMP TYPE 1. Single stage compressor system; gas or electric backup. This thermostat is designed to operate a single-transformer system. If you have a two-transformer system, cut and tape off one transformer. If transformer safety circuits are in only one of the systems, remove the transformer of the system with NO safety circuits. If required, replace remaining transformer with a 75VA Class II transformer. After disconnecting one transformer, the two commons must be jumpered together.
| SYSTEM | Heat Pump 1 | Heat Pump 2 |
|---|---|---|
| L | Malfunction Light | Malfunction Light |
| C | 24 Volt (Common) | 24 Volt (Common) |
| R | 24 Volt (Hot) | 24 Volt (Hot) |
| THERMOSTAT TERMINALS (HEAT PUMP) | ||
| W2 | HP 1 and Emergency 2nd stage | HP2 3rd stage |
| HP1 | 1st stage | |
| Y2 | 2nd stage compressor | |
| Y1 | 1st stage compressor | No Heat and Cool mode 1st stage |
| G | Blower/Fan Energized on call for Heat and Cool | |
| O/B | Set GAS/ELEC switch for Emergency mode | Energized in Heat OFF Emergency mode |
| O | Energized in Cool Mode |
*The 24 volt neutral connection to terminal C on the thermostat is not required if you replace the batteries once a year with fresh "AA" Energizer® alkaline batteries.*
Multi-Stage Terminal Outputs
Refer to equipment manufacturers' instructions for specific system wiring information. You can configure the thermostat for use with either multi-stage electric heat systems or multi-stage gas systems. When configured for electric heat, the G terminal (blower/fan) will be energized on a call for heat. This thermostat is designed to operate a single-transformer system. If you have a two-transformer system, cut and tape off one transformer. If transformer safety circuits are in only one of the systems, remove the transformer of the system with NO safety circuits. If required, replace remaining transformer with a 75VA Class II transformer. After disconnecting one transformer, the two commons must be jumpered together.
| SYSTEM | Multi-stage |
|---|---|
| L | Malfunction Light |
| C | 24 Volt (Common) |
| R | 24 Volt (Hot) |
| THERMOSTAT TERMINALS (MULTI-STAGE) | |
| W2 | Heat Mode 2nd stage |
| E/W1 | Emergency Mode 1st stage |
| Y2 | Cool Mode 2nd stage |
| Y1 | Cool Mode 1st stage |
| G | Blower/Fan Energized on call for Cool (and Heat if configured to Electric Heat) |
| O | Energized in Cool Mode |
| B | Energized in Heat, Off Emergency Modes |
*The 24 volt neutral connection to terminal C on the thermostat is not required if you replace the batteries once a year with fresh "AA" Energizer® alkaline batteries.*
To prevent static discharge problems, touch side of thermostat to release static build-up before touching any keys. The system "mode" is selected by pressing the SYSTEM button. Icons on the bottom right corner of the display will indicate the mode: COOL (❄️), AUTO (🔥❄️), HEAT (🔥), EMER, or OFF. In any mode except OFF, the setpoint temperature will be shown on the right side of the display. In OFF, this area will be blank. The current temperature will be displayed on the left side of the display. To operate properly in the AUTO mode, the heat setpoint temperature cannot be the same as or higher than the cool setpoint temperature. The heat setpoint must be at least 1° lower than the cool setpoint.
Automatic System Changeover: When the thermostat is in the AUTO mode, both the Flame and Snowflake icons are displayed. The thermostat will call for heat or cool depending on the room temperature. The setpoint temperature displayed will be that of the last mode called. If the last system cycle was heat, the HEAT setpoint will be displayed. If the room temperature raises above the HEAT setpoint and the COOL setpoint and a call for cool is required, the temperature displayed will change to be the COOL setpoint.
Second Stage Time Delay: Your thermostat is designed to determine the optimum time to activate the second stage. Simply raising the temperature in heating or lowering it in cooling will not always force the thermostat to bring the second stage on quickly. There is a time delay from 0-30 minutes depending on the performance of the first stage of the system. EXAMPLE: For the last 2 hours the thermostat is set on 70 ° and the room temperature is 70 ° with the equipment using only the first stage of heat. Since the equipment is keeping the temperature within 1° of setpoint, the thermostat will delay second stage for a longer time if you manually raise the temperature or if the room temperature quickly changes. Once the second stage comes on, it will come on sooner the next time there is a difference between the setpoint and the room temperature. The net effect of the staging program is that when the first stage is capable of making temperature the second stage will delay longer. When the thermostat calculates that first stage cannot make temperature in a reasonable time, the second stage will come on sooner. This built in function automatically optimizes the use of additional stages of heat or cool.
Manual Operation: Permanent Program Override (HOLD) - With the SYSTEM button set to HEAT or COOL, press the HOLD button once and release. "HOLD" will be displayed. Use up or down arrow to adjust the temperature. The thermostat will hold the room temperature at the selected setting until you press RUN button to start program operation again. Temperature Program Override - Press up or down arrow until the display shows the temperature you want. The thermostat will override current programming and keep the room temperature at the selected temperature for a programmed time period. "HOLD" will be displayed and flashing. The thermostat will automatically revert to the program after programmed period.
LOW BATTERY INDICATOR: If the 2 "AA" alkaline batteries are low and should be replaced, the display will be blank except for "LO BATT". When "LO BATT" is displayed, all buttons are inoperable until the batteries are replaced. Even if the "LO BATT" warning is displayed, the thermostat will still operate your system using the calculated setpoint temperature, but displays and programming accuracy will be lost. This type of failure of the thermostat WILL NOT affect the operation of your heat pump system. When you replace the batteries, the thermostat will return to normal operation. If you replace the batteries and the "LO BATT" warning persists for a few minutes, set the SYSTEM switch to OFF, then set it back to ON. If the "LO BATT" warning still persists, call a professional service person for assistance.
If your system does not have a G terminal connection, skip to Heating System.
EMER bypasses the Heat Pump to use the heat source wired to terminal E on the thermostat. EMER is typically used when compressor operation is not desired, or you prefer back-up heat only.
To prevent compressor and/or property damage, if the outdoor temperature is below 50°F, DO NOT operate the cooling system.
The Thermostat Buttons and Switches
The Display
For Programmable Models Only:
Reset Operation Remove wires from R and C terminals (do not short), remove batteries for 2 minutes, reconnect. Display shows all segments on reset. Resets installer menu and programming to factory settings.
Comfort Alert Codes Monitors outdoor systems with Copeland Scroll compressors. Abnormal conditions shown by flashing ALERT codes on yellow LED:
Thermostat reacts by turning compressor off if Active Protection is ON.
General Troubleshooting
Factory Settings System Type: Single Stage (SS 1). Differential: Heat 0.6°F (single), 1.2°F (heat pump); Cool 1.2°F. Setpoint Range: 45°-90°F. Programming: Model-dependent (e.g., 5/1/1 Day for 1F85-277). All configurations reset to defaults on reset.