The White Rodgers 37-1406-1 is a freeze protection temperature control subbase with non-cycling manual reset for use with compatible mechanical thermostats in heating systems. It provides protection against freezing by activating auxiliary heat below 35°F and requires manual reset. Compatible with low voltage systems; replaces 37-1406. Below are the key specifications, installation, operation, and troubleshooting instructions.
Assemble tools: flat blade screwdriver, wire cutter/stripper, level. Shut off electricity at main fuse box until installation complete. Label wires before disconnecting. This subbase is for low voltage heating systems with freeze protection; not for line voltage. Install away from drafts or heat sources.
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 37-1406-1 is a subbase for freeze protection in heating systems, featuring non-cycling manual reset. It energizes auxiliary heat below 35°F to prevent freezing. Compatible with mechanical thermostats like 1F56, 1E30. Terminals: R (hot), W (heat), Y (cool if applicable), G (fan), AUX (auxiliary for freeze).
Applications: Low Voltage Heating Systems with Freeze Protection: Gas/Oil/Electric Furnaces, Heat Pumps, Hydronic; Replaces 37-1406.
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 24 VAC. Conform to NEC Class II circuits. Manual reset required after activation to avoid unnoticed freeze events.
Shut off power. Remove old subbase and thermostat. Label wires before disconnecting.
Mount new subbase level on wall. Connect wires to terminals. Attach compatible thermostat to subbase. Restore power and test.
Terminal Designations: R (24V hot), W (heat), AUX (freeze aux heat).
Standard Wiring: R to transformer hot, W to heating relay, AUX to auxiliary heat relay (activates on freeze).
CAUTION! Ensure proper polarity and connections per system type.
Restore power. Simulate low temp or use test button if available.
Not directly controlled; follows thermostat.
Not applicable; heating protection only.
Non-programmable subbase. Operation controlled by attached thermostat.
Set anticipator on thermostat if applicable. No additional config for subbase.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| AUX not activating | Wiring, low temp not reached. | Check wiring; test with ice pack. |
| System locked out | Freeze event occurred. | Manual reset button. |
| No heat | Power, wiring. | Check power and connections. |