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Thermostats act as the main switch for temperature regulation. When the temperature moves away from the set level, the device opens or closes electrical contacts to turn heating or cooling stages on and off.
Specifications
- Part number: 11930
- Brand: Gaylord
- Part type: Thermostat
- Height: 2.3 in / 5.84 cm
- Length: 13.85 in / 35.18 cm
- Width: 4.3 in / 10.92 cm
- System: gas, electric or heat pump, as listed
- Stages: heat and cool stages your system uses
- C wire: needed by some models, check yours
From the maker's and parts sellers' listings for this number. Compare them with the label on your old part.
How This Thermostat Works
A thermostat monitors the temperature around its sensor. Depending on how the system is set, it signals the equipment to start or stop heating or cooling.
Most central systems use 24 V thermostats, while baseboard heaters use line voltage. Because these setups are not the same, confirming the voltage type is essential before servicing the controls.
Physical Dimensions and Measurements
When comparing your old control to this part number, ensure the physical space inside the housing or mounting area matches the recorded measurements.
The listed dimensions for the 11930 include:
- Height: 2.3 in / 5.84 cm
- Length: 13.85 in / 35.18 cm
- Width: 4.3 in / 10.92 cm
Confirming a Proper Match
Thermostats must match the heating and cooling stages your equipment uses. Verify whether your system is gas, electric, or a heat pump.
Also check if your setup requires a C wire. Some thermostat models need this common wire for continuous power, while others do not.
Signs of Failure and Safe Replacement Steps
A faulty thermostat may fail to signal the equipment, resulting in no heat or no cooling when called for. If the temperature display does not match room conditions or the system never shuts off, the switch contacts or internal sensor may be worn out.
Follow these steps to replace the part safely:
- Turn off power to the equipment at the breaker panel or service switch.
- Remove the cover and take a photo of which wire goes to which letter terminal.
- Move wires one at a time to the same spots on the new part.
- Secure the unit in its mounting position and restore power at the breaker.
Read your old part
- Locate the label or stamp on the body of your existing part.
- Check that the part number reads 11930.
- Confirm the brand reference Gaylord matches your equipment documentation.
- Measure the old part to see if it fits within 2.3 in / 5.84 cm height, 13.85 in / 35.18 cm length, and 4.3 in / 10.92 cm width.
When to call a pro
Hire a licensed HVAC technician for any step you are not sure you can do safely. If wiring is damaged or if the system does not respond correctly after installation, a professional can test circuits and resolve underlying issues.
Questions
What voltage does this type of thermostat use?
Most central systems use a 24 V control signal from a transformer. Baseboard heating systems use line voltage. Always verify your system voltage before handling any connections.
What should I do before disconnecting any wires?
Turn off power at the switch or circuit breaker. Then take a clear photo showing which wire attaches to each labeled terminal so you can reconnect them accurately.
Does this thermostat require a C wire?
A C wire is needed by some models. You must check your existing system wiring and the requirements of your specific control to determine if a C wire is needed.
Related part numbers
- 18781Thermostat, GaylordSame brand and type
- 18782Thermostat, GaylordSame brand and type
- 1053-00004-00Thermostat, FetcoSame part type
- 10283Relay Reference, GaylordSame brand
- 1053-00003-00Thermostat, FetcoSame part type
- 300701Hi-Limit Thermostat, ClevelandSame part type
- CT87K1004Thermostat, HoneywellSame part type
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