White Rodgers Comfort-Set 1F94-371 User Manual

The White Rodgers 1F94-371 is a premium 7-day programmable digital thermostat from the Comfort-Set 90 Series for multi-stage heat/cool or heat pump systems with electric or fossil fuel auxiliary. It features 7-day programming with 4 periods per day, automatic/manual changeover, humidifier and dehumidifier control, wireless remote sensors (up to 3 indoor), outdoor sensor support, and service reminders. Powered by 24 VAC (requires hot and common); compatible with 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. Shut off electricity at main fuse box until installation complete. Label wires before disconnecting. This thermostat is for 24V systems only; not for line voltage. Install away from drafts, direct sunlight, or heat sources for accurate sensing. Install 3 AA alkaline batteries 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 technology to provide precise time, humidity, and temperature control. Features 7-day programming with four time/temperature settings per day, simultaneous heat/cool programs, up to 2 stages heat/2 stages cool, humidifier control (HM), dehumidifier control (DHM), wireless remote sensors (up to 3 indoor via SA/SB/SC), outdoor sensor (OT), automatic changeover, compressor protection, service reminders. LCD display shows time/room temp/setpoint/humidity, up/down arrows, SYSTEM switch (HEAT/OFF/COOL/AUTO/EMER), FAN switch (ON/AUTO). Terminals: R (hot), C (common), G (fan), O/B (changeover), Y1/Y2 (compressor stages), W1/W2 (heat stages), HM (humidifier), DHM (dehumidifier), L (fault), SA/SB/SC (remote sensors), OT (outdoor).

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 in doubt about wiring, consult qualified heating/air conditioning contractor.

WARNING! Do not use on circuits exceeding 20-30 VAC 50/60 Hz (0.05-1.5A per terminal, 2.5A max total); higher voltage damages control/causes shock/fire. Do not short terminals on gas valve/primary control to test; short/incorrect wiring burns out components/causes injury/property damage. Conform to NEC Class II circuits. Do not operate cooling below 50°F (compressor damage).

ATTENTION! This product does not contain mercury but may replace one that does. Do not open mercury cells; if damaged, wear non-absorbent gloves, clean up spilled mercury, place in sealed container. Refer to www.white-rodgers.com for disposal. Handle to avoid static discharge.

Specifications

• Electrical: 20-30 VAC 50/60 Hz, NEC Class II; Terminal Load 0.05-1.5A per terminal, 2.5A max total (requires R and C).
• Batteries: None (hardwired only).
• Setpoint Range: 45°F to 99°F (7°C to 37°C).
• Operating Ambient: 32°F to 110°F (0°C to 43°C).
• Humidity: 90% non-condensing max.
• Shipping: -4°F to 149°F (-20°C to 65°C).
• Dimensions: Approx. 3-1/2”H x 5-1/2”W x 1-1/8”D.
• Other: 7-day programming with 4 periods/day; Humidity control; Wireless remote sensors; Compressor lockout.

Removing Old Thermostat

A standard heat/cool thermostat consists of three basic parts: 1) Cover; 2) Base; 3) Subbase. Label each wire with terminal designation before disconnecting. Disconnect wires one at a time; do not let fall into wall.

Installation

Remove old thermostat. Mount new base level on wall, connect wires to terminals. Push excess wire into wall, secure base, attach thermostat body. Power up and configure.

Wiring Diagrams

Terminal Designations: R (24V hot), C (common), Y1/Y2 (compressor stages), G (fan), W1/W2 (heat stages), O/B (changeover), HM (humidifier), DHM (dehumidifier), L (fault), SA/SB/SC (remote sensors), OT (outdoor sensor).

Single Stage Heat/Cool: R to hot, C to common, Y1 to compressor, G to fan, W1 to heat.

Multi-Stage (MS2): Add Y2 2nd compressor, W2 2nd heat.

Heat Pump (HP1/HP2): Y1/Y2 compressor, O/B changeover (O cool, B heat), W1/W2 aux heat.

Humidifier: HM to humidifier relay; 24V or 120V setups.

Dehumidifier: DHM to relay for fan speed control.

Remote Sensors: SA/SB/SC for indoor wireless, OT for outdoor.

CAUTION! For single transformer systems. Refer to equipment manuals for specifics.

Check Operation

Restore power. Set SYSTEM to HEAT/COOL, FAN to ON/AUTO, adjust setpoint to test.

Fan Operation

1. FAN ON: Blower runs continuously.
2. FAN AUTO: Blower runs on call for heat/cool.

Heating System

1. SYSTEM HEAT.
2. Setpoint above room temp: Heat activates (LED indicators for stages).
3. Setpoint below: Heat stops.

Emergency System

1. SYSTEM EMER (red LED).
2. Setpoint above: Aux operates.
3. Setpoint below: Stops.

Cooling System

CAUTION! Do not operate below 50°F.

1. SYSTEM COOL.
2. Setpoint below room temp: Cool activates (5-min delay first time).
3. Setpoint above: Cool stops.

Operating Features

• Home Screen: LCD shows time/temp/humidity, alternates; icons for system on, hold, filter, etc.
• Key Features: Automatic changeover, preprogrammed schedules, short-cycle protection, programmable fan, filter/humidifier reminders, temporary override, indefinite hold, wireless remote sensing (up to 3 indoor, 1 outdoor), dehumidification control, compressor protection, range limits 45-99°F.
• Humidity Control: Set % RH for humidify/dehumidify; HM/DHM terminals activate accordingly.
• Remote Sensors: Averages multiple indoor sensors; outdoor for balance point.

Programming

7-day programming; 4 periods (MOR/DAY/EVE/NHT). Factory preprogrammed; press PROGRAM + RUN to start.

1. Set Time/Day: Press SET TIME ± for hour/min, SET DAY for day.
2. Program: Select HEAT/COOL, press PROGRAM for period, TIME/TEMP ± to set.
3. Copy: Hold COPY to duplicate day/period.
4. Review: Press PROGRAM to cycle through.
5. Run: Press RUN.
6. Hold: Press HOLD for permanent; temporary override available.

Factory Heat: All days: 6AM 70°F, 8AM 62°F, 5PM 70°F, 10PM 62°F. Cool: All days: 6AM 78°F, 8AM 85°F, 5PM 78°F, 10PM 82°F.

Installer Configuration

Press TIME FWD + TIME BACK to enter User menu, then hold SET TIME + SET DAY for 3 sec to enter Installer menu. Use UP/DOWN to adjust, TIME FWD to advance.

Troubleshooting

Reset Operation: Remove wires from R and C (do not short), power cycle 2 min. Resets to factory defaults.

Homeowner Help Line: 1-800-284-2925; www.white-rodgers.com