The White Rodgers 1F93-380 is a premium 7-day programmable electronic 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 2 periods per day (occupied/unoccupied), automatic/manual changeover, Computed Energy Management Recovery (EMR), and battery backup with 3 AA batteries. 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.
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 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.
The thermostat uses solid-state microcomputer technology to provide precise time/temperature control. Features 7-day programming with two time/temperature settings per day (occupied/unoccupied), up/down arrows for adjustment, SYSTEM switch (HEAT/EMER/OFF/COOL/AUTO), FAN switch (ON/AUTO), multi-color indicator (green 1st stage, yellow 2nd stage, red emergency). Terminals: R (hot), C (common), G (fan), O/B (changeover), Y1/Y2 (compressor stages), W1/W2 (aux heat stages). Supports multi-stage heat pump with/without aux/emergency heat, multi-stage conventional systems.
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.
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! 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.thermostat-recycle.org for disposal. Turn to OFF before battery replacement. Use alkaline only. Handle to avoid static discharge.
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.
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.
Batteries: Install 3 AA alkaline (positive to + terminal); low battery flashes "BAT". Replace if continuous; program retained.
Terminal Designations: R (hot), C (common), G (fan), O (cool changeover), B (heat changeover), Y1 (stage 1 compressor), Y2 (stage 2 compressor), W1 (stage 1 aux heat), W2 (stage 2 aux heat).
Single Transformer Systems: R to hot, C to common, 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.
Turn on power; light standing pilot if applicable. Set option switches to manual changeover for testing. The LED indicator will glow green for first stage and yellow for second stage. EMERGENCY (heat pump only): Press to select EMER SYSTEM mode. The LED indicator will glow red for emergency mode. A flashing light indicates a malfunction in the system.
CAUTION! Do not operate below 50°F if power off >1 hour (warm compressor oils).
Factory preprogrammed 7-day; 2 periods (OCCU/UNOC); independent heat/cool. RESET to restore defaults. To enter the User Configuration menu, press PROGRAM to make sure the thermostat is in the run program mode, then press TIME TIME BACK at the same time.
Factory Heat: OCCU 8:00 AM 70°F, UNOC 10:00 PM 62°F. Cool: OCCU 75°F, UNOC 85°F.
Set option switches on back before mounting. Remove battery 2 min when changing. To enter the User Configuration menu, press PROGRAM RUN to make sure the thermostat is in the run program mode, then press TIME FWD and TIME BACK at the same time.
| Step | Press Button(s) | Displayed (Factory Default) | Press or to select | Comments |
|---|---|---|---|---|
| 1 | TIME FWD TIME BACK | 0 ° F (room temperature) | 5 LO to 5 HI | Adjusts temperature display higher or lower. |
| 2 | TIME FWD | EMR (ON) OFF or ON L | OFF or ON L | Selects EMR option ON or OFF or L ON. |
| 3 | TIME FWD | ( ° F) ° C | ° F or ° C | Adjusts temperature display to ° F or ° C. |
| 4 | TIME FWD | SET FAN (0) 0 - 6 HRS | 0 - 6 HRS | Set Fan (one shot) option. Set the duration of a temporary fan option. |
| 5 | TIME FWD | BEEP (ON) OFF | ON or OFF | Turns keypad beeper ON or OFF. |
| 6 | TIME FWD | HEAT FAST (OFF) ON | OFF or ON | OFF delays starting second stage for economy. ON starts second stage earlier with user intervention. |
| 7 | TIME FWD | COOL FAST (OFF) ON | OFF or ON | OFF delays starting second stage for economy. ON starts second stage earlier with user intervention. |
| 8 | TIME FWD | TEMP OUT (OFF) ON | OFF or ON | Enables outdoor temperature sensor. Requires optional remote sensor connected to terminal OT and remote thermistor probe. Also displays outdoor temperature if active. |
| 9 | TIME FWD | FONE (Icon) (OFF) ON | OFF or ON | Telephone RUN program feature. Requires optional X10 system. |
| 10 | TIME FWD | COMP RUN TIME (00) (Compressor run time in hours) | PROGRAM RUN TIME FWD | Shows accumulated time compressor has run. To reset to 00, press and . |
| 11 | TIME FWD | AUX RUN TIME (00) (AUXILIARY run time in hours) | PROGRAM RUN TIME FWD | Shows accumulated time AUXILIARY has run. To reset to 00, press and . |
Keypad Lockout Menu (access from User Menu):
| Step | Press Button(s) | Displayed (Factory Default) | Press or to select | Comments |
|---|---|---|---|---|
| 1 | PROGRAM RUN TIME and TIME (hold for two seconds) FWD BACK TIME FWD | PART LOCK (OFF) ON | OFF or ON | Partial Keypad lockout OFF or ON. |
| 2 | LOCK (OFF) ON | OFF or ON | Total Keypad lockout OFF or ON. |
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| No Display | Dead battery. | Replace 3 AA alkaline; "BAT" flashes/continuous. |
| System Won’t Turn On | Lockout active; no call; wiring. | Wait 5 min; check setpoint/mode; verify wires. |
| Fan Runs Continuously | FAN ON. | Set to AUTO. |
| Incorrect Temperature | Wrong program/time. | Check/adjust program, clock. |
| Power Failure | No battery. | Reprogram; defaults 64°F heat/82°F cool. |
| Static Discharge | Handling. | Touch grounded object before handling. |
| Display Blank | Power loss; dead batteries. | Check R/C wiring; replace 3 AA batteries. |
| Battery Indicator Flashing | Low batteries. | Replace 3 AA; program retained. |
| No Heat/No Cool | Wrong mode; setpoint; wiring; no R/C. | Set mode; adjust setpoint; verify wires/R C connected. |
| Fan Not Running | No G wire; AUTO no call. | Check G; set ON. |
| Short Cycling | 5-min lockout. | Wait; override for testing: hold PRGM + TEMP at startup. |
| Program Lost | Extended power failure without batteries. | Reprogram; defaults to 64/82°F. |
| Stages Not Activating | Setpoint differential not met; config. | Adjust setpoint 1°/3°/5°; check option switches. |
| Emergency Heat Not Working | Not in EMER mode; wiring. | Set SYSTEM EMER; check W1/W2/W3 wires. |
RESET BUTTON: If the thermostat does not respond when keys are pressed, or the thermostat is not operating properly, you may use the reset button located on the back of the thermostat body. RESET SWITCH: See the Troubleshooting section at the end of this document for more information about the function of this switch.