The White Rodgers 1D56 is a low voltage horizontal snap-action thermostat designed for standard heating and cooling systems, electric heating/cooling, and single-stage heat pump applications. It features an adjustable heating anticipator and fixed cooling anticipator for maximum room comfort. Below are the key specifications, installation, operation, and troubleshooting instructions.
Assemble tools: Screwdriver, wire strippers, level. Disconnect electric power to the system at the main fuse or circuit breaker box until installation is complete to prevent electrical shock and/or equipment damage.
CAUTION! Handle the control carefully as it is a precision instrument; rough handling could cause malfunction. Ensure all wiring conforms to local and national electrical codes and ordinances.
If in doubt about wiring type (millivolt, line, or low voltage), consult a qualified heating and air conditioning contractor, electrician, or someone familiar with basic electricity and wiring.
These low voltage thermostats (1D56 and 1F56) are designed to provide convenient control of heating/cooling systems. They combine a sensitive spiral bimetal with an adjustable heating anticipator and a fixed cooling anticipator for maximum room comfort. Suitable for standard heating/cooling systems, electric heating and cooling systems, and single-stage heat pump applications (no multi-stage operation).
WARNING! Failure to read and follow instructions could cause personal injury and/or property damage. Do not exceed specification ratings (30 VAC max.). Do not use on circuits exceeding 30 volts (could damage control, cause shock, or fire). Do not short out terminals on gas valve or primary control to test (could burn out heat anticipator).
CAUTION! Disconnect power before installation. Take care when securing and routing wires to avoid shorts to adjacent terminals (could cause injury or damage). For heat pump applications, install a short jumper wire across terminals W and Y for single-stage operation.
Refer to equipment manufacturer's instructions for exact hookup.
Typical Wiring for Heating/Cooling: Connect transformer (24 VAC) to terminals; use jumper wires as needed.
Heat Pump Applications: Install short jumper across W and Y terminals. If old thermostat has continuously energized terminal, disconnect wire.
Electric Heat Furnaces (Single Transformer Systems): Specific wiring per system; ensure no shorts.
General Terminals: Include R, C, G, W, Y, etc. (e.g., R for power, C for common, G for fan, W for heat, Y for cool).
Jumper Wires: Factory-installed red jumper (e.g., for compressor relay); field-installed yellow jumper. Keep GRC area clear of wires.
Figure 5: Shows transformer (24 VAC), compressor relay, system wiring with neutral and energized terminals in heating/cooling.
CAUTION! Ensure wires do not short to adjacent terminals.
Temperature Adjustment: Move lever to set desired room temperature.
CAUTION! Adjustable heat anticipator will burn out if 25 VAC is applied directly by shorting primary control during testing.
If control malfunctions: Check for improper wiring, shorts, or exceeded ratings.
Anticipator Issues: Ensure proper adjustment to prevent burnout; test at correct voltage.
General: Inspect wiring if system fails to operate; consult professional for doubts on voltage/wiring.