White Rodgers 1F86-344 User Manual

The White Rodgers 1F86-344 is a non-programmable electronic digital thermostat for 24V HVAC systems. It features simultaneous heat and cool setpoint storage, pre-set temperature control, backlit display, and LCD continuously displaying setpoint and room temperature. Compatible with standard heat/cool or heat only systems, electric heat, gas/oil fired, hydronic, single-stage heat pumps (no auxiliary heat), and millivolt systems. Requires 2 AA alkaline batteries. Below are the key specifications, installation, operation, and troubleshooting instructions.

Preparations

Assemble tools required: screwdriver, wire cutter/stripper.

WARNING: 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 electrical power to the system at the main fuse or circuit breaker until installation is complete. Do not exceed the specification ratings.
• WARNING: All wiring must conform to local and national electrical codes and ordinances. Do not use on circuits exceeding specified voltage. Higher voltage will damage control and could cause shock or fire hazard. This control is a precision instrument, and should be handled carefully. Rough handling or distorting components could cause the control to malfunction. 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.

This thermostat is intended for use with a low voltage system; do not use this thermostat with a line voltage system. If in doubt about whether your wiring is millivolt, line, or low voltage, have it inspected by a qualified heating and air conditioning contractor or electrician.

Specifications

Electrical Data

• 8 to 30 VAC 50/60 Hz. or D.C.
• 0.05 to 1.0 Amps (Load per terminal)
• 1.5 Amps Maximum Total Load (All terminals combined)

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: -4°F to 150°F

Features:

• °F/°C convertibility
• Temperature range 45° to 90°F
• RC, RH, C, W, Y, G, O and B terminals
• Optional C terminal (Dual Power option)
• B and O terminals for single stage heat pumps (no auxiliary heat) or damper operation
• Setpoint storage in case of power loss
• 2 "AA" alkaline batteries included

Thermostat Details

The thermostat consists of two parts: the thermostat cover and the base. To remove the cover, gently pull it straight out from the base. To replace the cover, line up the cover with the base and press gently until the cover snaps onto the base.

The Thermostat Buttons and Switches:

1. Up arrow: Raises temperature setting.
2. Down arrow: Lowers temperature setting.
3. SET TIME button.
4. VIEW PRGM (program) button.
5. RUN PRGM (program) button.
6. HOLD TEMP button.
7. FAN switch (ON, AUTO).
8. SYSTEM switch (COOL, OFF, HEAT).

The Display:

• Indicates day of the week.
• Flame icon displayed when the SYSTEM switch is in the HEAT position. Snowflake icon displayed (non-flashing) when the SYSTEM switch is in the COOL position. Snowflake displayed (flashing) when the compressor is in lockout mode.
• Displays “BATT” when the 2 “AA” batteries are low and should be replaced.
• Alternately displays current time and temperature.
• The word “HOLD” is displayed when the thermostat is in the HOLD mode.
• Displays currently programmed set temperature (this is blank when SYSTEM switch is in the OFF position).

Removing Old Thermostat

1. Shut off electricity at the main fuse box until installation is complete. Ensure that the electrical power is disconnected.
2. Remove the front cover of the old thermostat. With wires still attached, remove wall plate from the wall. If the old thermostat has a wall mounting plate, remove the thermostat and the wall mounting plate as an assembly.
3. Identify each wire attached to the old thermostat using the labels enclosed with the new thermostat.
4. Disconnect the wires from the old thermostat one at a time. DO NOT LET WIRES FALL BACK INTO THE WALL.

Mounting and Wiring

Remove the packing material from the thermostat. Gently pull the cover straight off the base. Forcing or prying on the thermostat will cause damage to the unit.

Wiring Diagrams

NOTE: The following wiring diagrams show typical terminal identification and wiring. For proper installation, refer to the original manufacturer's instructions. * 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. Relay contacts shown are thermostatically operated.

Figure 3. Typical wiring diagram for single transformer systems

Thermostat terminals: C*, R, B, O, Y, G, W. System: Energized in HEAT (Heating System), Energized in COOL (Cooling System), Fan Relay. Transformer: 24 VAC (Hot, Neutral), 120 VAC. Single transformer setup with connections to heating, cooling, and fan systems.

Figure 4. Typical wiring diagram for two-transformer systems with NO safety circuits

Thermostat terminals: B, C*, R, Y, G, O, W. System: Energized in COOL (Cooling System), Energized in HEAT (Heating System), Fan Relay. Transformers: 24 VAC (Hot, Neutral) for heating, 120 VAC (Hot, Neutral) for cooling. Note: CUT AND TAPE OFF! TWO COMMONS MUST BE JUMPERED TOGETHER! Dual transformer setup without safety circuits, with jumpered commons.

Figure 5. Typical wiring diagram for two-transformer systems with safety circuits in BOTH systems

Thermostat terminals: B, C*, R, Y, G, O, W. System: Energized in COOL (Cooling System), Energized in HEAT (Heating System), Fan Relay, Accessory Relay N.O. Contact. Transformers: HEATING TRANSFORMER (24 VAC Hot, Common, Neutral), COOLING TRANSFORMER (24 VAC, 120 VAC Hot, Neutral). Safety: Limit or Safety Switches in both systems. Note: * 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. TWO COMMONS MUST BE JUMPERED TOGETHER! Dual transformer setup with safety circuits, including limit switches and accessory relay.

1. Connect wires beneath terminal screws on base using appropriate wiring schematic.
2. Place base over hole in wall and mark mounting hole locations on wall using base as a template.
3. Move base out of the way. Drill mounting holes.
4. Fasten base loosely to wall using two mounting screws. Adjust until level, and then tighten screws.
5. Push excess wire into wall and plug hole with a fire-resistant material (such as fiberglass insulation) to prevent drafts from affecting thermostat operation.

Check Operation

NOTE: To prevent static discharge problems, touch side of thermostat to release static build-up before touching any keys. If at any time during testing your system does not operate properly, contact a qualified service person.

Fan Operation

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

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

Heating System

1. Move the SYSTEM switch to the HEAT position. If the heating system has a standing pilot, be sure to light it.
2. Press up arrow to adjust the thermostat setting above room temperature. The heating system should begin to operate.
3. Press down arrow to adjust the temperature setting below room temperature. The heating system should stop operating.

Cooling System

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

This thermostat has a built-in short-term (5-minute) time delay. This feature is activated after the compressor shuts down and the setpoint is changed within the 5-minute period. During this 5-minute period, COOL will flash on the display indicating that the thermostat has locked out the compressor to allow head pressure to stabilize. This thermostat does not sense AC power loss and therefore does not activate the short term compressor protection feature when power is restored.

1. Move the SYSTEM switch to the COOL position.
2. Press up arrow to adjust the thermostat setting below room temperature. The blower should come on immediately on high speed, followed by cold air circulation.
3. Press down arrow to adjust the temperature setting above room temperature. The cooling system should stop operating.

Operating Features

• SIMULTANEOUS HEATING/COOLING PROGRAM STORAGE: When programming, you can enter both your heating and cooling programs at the same time. There is no need to reprogram the thermostat at the beginning of each season.
• TEMPERATURE 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 until the next program period begins. Then the thermostat will automatically revert to the program.
• HOLD TEMPERATURE: The thermostat can hold any temperature within its range for an indefinite period, without reverting to the programmed temperature. Press HOLD TEMP button. HOLD will be displayed. Then choose the desired hold temperature by pressing up or down. The thermostat will hold the room temperature at the selected setting until you press RUN PRGM button to start program operation again.
• °F/°C CONVERTIBILITY: Press and hold SET TIME and HOLD TEMP buttons until the temperature display is in Celsius (°C). To display Fahrenheit (°F), repeat the process.
• LOW BATTERY INDICATOR: If the 2 “AA” alkaline batteries are low and should be replaced, the display will be blank except for the word BATT. When the batteries are low, pressing any button will cause the display to operate for ten seconds. After ten seconds, the display will be blank except for the word BATT. You cannot program with low batteries, but you can override setpoint temperature.
• TEMPERATURE DISPLAY ADJUSTMENT: Your new thermostat has been accurately set in our factory. However, if you wish, you may adjust your new thermostat temperature display to match your old thermostat. This can be accomplished (within a ±4°F range) as follows: 1. Press VIEW PRGM and HOLD TEMP buttons at the same time. 2. Press up or down to adjust the displayed temperature to your desired setting. 3. Press RUN PRGM to resume normal program operation.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No Heat/No Cool/No Fan (common problems)	1. Blown fuse or tripped circuit breaker. 2. Furnace power switch to OFF. 3. Furnace blower compartment door or panel loose or not properly installed.	1. Replace fuse or reset breaker. 2. Turn switch to ON. 3. Replace door panel in proper position to engage safety interlock or door switch.
No Heat	1. Pilot light not lit. 2. Loose connection to thermostat or system. 3. Thermostat or heating system requires replacement or service. 4. SYSTEM Switch not set to HEAT.	1. Re-light pilot. 2. Verify thermostat and system wires are securely attached. 3. Your furnace manufacturer or service person can describe how to test the heating system to verify it is operating correctly. If the heating system is capable of operation and the no heat condition persists, replace the thermostat. 4. Set SYSTEM Switch to HEAT and raise temp above room temp.
No Cool	1. Loose connection to thermostat or system. 2. Thermostat or cooling system requires replacement or service. 3. SYSTEM Switch not set to COOL.	1. Verify thermostat and system wires are securely attached. 2. Your cooling system manufacturer or service person can describe how to test the cooling system to verify it is operating correctly. If the cooling system is capable of operation and the no cooling condition persists, replace the thermostat. 3. Set SYSTEM Switch to COOL and lower temp below room temp.
Heat, Cool or Fan Runs Constantly	1. Possible short in wiring. 2. Possible short in thermostat. 3. Possible short in heat/cool/fan system.	Check each wire connection to the thermostat to verify it is neatly looped under the terminals. No extra wire should stick out from under the terminals.
Furnace Cycles Too Fast or Too Slow (narrow or wide temperature swing)		The cycle rate is fixed. The location of the thermostat, size of the Heat/Cool System and current draw can influence the cycle rate. Contact a local service person for additional suggestions.
Cooling Cycles Too Fast or Too Slow (narrow or wide temperature swing)	1. Poor thermostat location for sensing room temperature. 2. Cooling system over or undersized. 3. Excessive Current draw influencing thermostat.	The cycle rate for cooling can not be adjusted. The location of the thermostat, size of the Cool system and current draw can influence the cycle rate. Contact a local service person for suggestions.
Thermostat Setting and Thermostat Thermometer Disagree	1. Thermostat thermometer setting requires adjustment.	The thermometer can be adjusted by using a standard slotted screwdriver. Turn the thermometer pointer screw located inside the front cover to change the setting. For calibrating the setting lever contact a local heating and cooling service person.
Blank Display and/or Keypad Not Responding	Battery or RC wire problem.	Replace batteries and check heat/cool system for proper operation. If a voltage spike occurs use the Reset Operation listed above.