White Rodgers 1F92W-51 User Manual

The White Rodgers 1F92W-51 is a multi-stage/heat pump electronic digital thermostat with five-day/two-day programming capability for multi-stage heat/cool or heat pump systems, including up to 2 stages of heat and 1 stage of cool, with automatic/manual changeover option. It features simultaneous heat/cool program storage, four time/temperature settings per 24-hour period, Computed Energy Management Recovery (EMR), and 9-volt alkaline battery backup. Powered by 24 VAC (requires hot and common); compatible with 20-30 VAC systems up to 1.5A per terminal, 2.5A max total. Below are the key specifications, installation, operation, programming, and troubleshooting instructions.

Preparations

Assemble tools: hand or power drill with 3/16 inch drill bit (if needed), flat blade screwdriver, wire cutter/stripper, level, voltmeter. Shut off electricity at main fuse box until installation complete. Label wires before disconnecting. Select location 5 ft. above floor on inside wall, away from drafts, direct sunlight, heat sources, windows, doors, registers, poor circulation areas. For new installations, probe for obstructions, drill 3/4" hole for wires. Install 9-volt alkaline battery before programming.

WARNING! Failure to read and follow all instructions carefully before installing or operating this control could cause personal injury and/or property damage. Save these instructions.

Description

The thermostat uses solid-state microcomputer for precise time/temperature control. Features five-day/two-day programming with four time/temperature settings per day, simultaneous heat/cool programs, up to 2 stages heat/1 stage cool, EMR, automatic changeover (selectable), compressor protection, lockout bypass (technician only), fan auto/continuous, emergency heat mode. LCD display alternates time/room temp/setpoint, up/down arrows, SYSTEM switch (HEAT/OFF/COOL/AUTO/EMER), FAN switch (ON/AUTO). Terminals: (10) G fan, (11) C common (not used), (12) R hot, (13) O cool changeover, (14) B heat changeover, E/W1 emergency/stage 1 heat, W2 stage 2 heat.

Applications: Multi-Stage Heat Pump: Yes; Heat Pump with Aux/Emergency: Yes; Multi-Stage Conventional: Yes; Single-Stage Heat/Cool: Yes; Heat Only: Yes; Cool Only: Yes; Gas/Oil/Electric/Hydronic: Yes; Millivolt: No.

Precautions

CAUTION! To prevent electrical shock/equipment damage, disconnect power at main fuse/circuit breaker until installation complete. Label wires prior to disconnection. If unsure about wiring, consult qualified contractor.

WARNING! Do not use on circuits exceeding 20-30 VAC 50/60 Hz (0.01-1.5A per terminal, 2.5A max total); higher voltage damages control/causes shock/fire. Do not short terminals to test; incorrect wiring causes injury/property damage. Conform to NEC Class II circuits. Do not operate cooling below 50°F if power off >1 hour (compressor damage; allow heaters to warm oils). Lockout bypass only for technicians after 6 hours oil heaters on, 5 min off.

ATTENTION! Turn to OFF before battery replacement. Use alkaline only. Handle to avoid static discharge.

Specifications

• Electrical: 20-30 VAC 50/60 Hz, NEC Class II; Terminal Load 0.01-1.5A per terminal, 2.5A max total (requires hot/common).
• Battery: 9-volt alkaline (backup).
• Setpoint Range: 45°F to 99°F (7°C to 37°C).
• Operating Ambient: 32°F to 105°F (0°C to 41°C).
• Humidity: 90% non-condensing max.
• Shipping: -40°F to 150°F (-40°C to 65°C).
• Dimensions: Approx. 3-1/2”H x 5-1/2”W x 1-1/8”D.

Removing Old Thermostat

Shut off electricity, verify with voltmeter. Remove cover, wall plate. Label each wire with terminal designation before disconnecting. Disconnect one at a time; do not let fall into wall. Pull at least 6 inches of wire through subbase opening.

Installation

Program thermostat with battery before mounting. Pull wires through subbase center. Connect wires to terminals. Place subbase over wall hole, mark mounting holes, drill, fasten with screws (level). Push excess wire into wall, seal with fire-resistant material (e.g., fiberglass). Attach thermostat body by aligning pins and snapping into place.

Battery: Install 9-volt alkaline (positive to + terminal); low battery flashes "BAT". Replace if continuous; program retained.

Wiring Diagrams

Terminal Designations: (10) G (fan), (11) C (common, not used), (12) R (24V hot), (13) O (cool changeover), (14) B (heat changeover), E/W1 (emergency/stage 1 heat), W2 (stage 2 heat).

Single Transformer Systems: R to hot, G to fan, O/B to changeover (O cool, B heat), Y1/Y2 to compressor stages, W1/W2 to aux heat.

Two Transformer (No Safety Circuits): Separate transformers; jumper commons if needed; cut/tape unused.

Two Transformer (Safety Circuits): Use accessory relay for safety; jumper commons.

CAUTION! Refer to equipment manuals for specifics. Tighten securely; keep wires clear. Both sides of transformer required at thermostat.

Check Operation

Turn on power; light standing pilot if applicable. Set option switches to manual changeover for testing.

Fan Operation

1. FAN ON: Blower operates continuously.
2. FAN AUTO: Blower cycles with system; stops within 1 min when off.

Heating System

1. SYSTEM HEAT.
2. Setpoint above room: Stage 1 heat activates within few degrees.
3. Further above: Stage 2 activates.
4. Setpoint below: Stops.

Emergency System

1. SYSTEM EMER (EMER flashes).
2. Setpoint above room: Emergency heat activates after 5-10 min delay.
3. Further above: Additional stages if configured.
4. Setpoint below: Stops.

Cooling System

CAUTION! Do not operate below 50°F if power off >1 hour (warm compressor oils).

1. SYSTEM COOL.
2. Setpoint below room: Cooling activates.
3. Setpoint above: Stops.

Operating Features

• Home Screen: Alternates time/day/temp/setpoint; icons for system on, hold, battery, EMR, mode, fan.
• Key Features: EMR (computes early start), automatic changeover (selectable, 3°F deadband), hold override (temporary/permanent), compressor lockout (5 min), anticipation adjustable, fan auto/continuous.
• Range Limits: 45-99°F.

Programming

Factory preprogrammed 5+2 day; 4 periods (MOR/DAY/EVE/NHT); independent heat/cool. RESET to restore defaults.

1. Set Time/Day: Press CLOCK, adjust TIME arrows hour/min, DAY for day.
2. Program Heat: SYSTEM HEAT, press PRGM for 5 DAY MOR, adjust TIME/TEMP arrows, PRGM advance to DAY/EVE/NHT/2 DAY.
3. Program Cool: SYSTEM COOL, repeat for cool setpoints.
4. Review: PRGM + VIEW to cycle.
5. Run: RUN.
6. Hold: Press HOLD, adjust TEMP, press HOLD to resume.

Factory Heat: MOR 5:30AM 70°F, DAY 8:00AM 76°F, EVE 5:00PM 70°F, NHT 10:30PM 68°F (similar for weekend). Cool: MOR 78°F, DAY 85°F, EVE 78°F, NHT 82°F.

Installer Configuration

Set option switches on back before mounting. Remove battery 2 min when changing.

Troubleshooting