Emerson Climate Technologies 1C21-101 Mechanical Cool Only Thermostat 24VAC
A mechanical cool-only thermostat with a 50 to 90 degree Fahrenheit range, hardwired for 24 VAC systems and mercury-free
- Product colorWhite
- Cool-only control for simple AC systems
- Mercury-free mechanical operation for reliability
- Hardwired 24 VAC power eliminates batteries
- Vertical mount fits standard wall boxes
- 50 °F to 90 °F range covers typical cooling needs
Mechanical Cool-Only Thermostat 24VAC
This Emerson mechanical thermostat provides simple cooling control for residential and light-commercial HVAC systems. It operates on 24 VAC hardwired power and suits gas or oil equipment where a basic temperature dial is preferred.
Vertical Mount Hardwired Installation
The unit mounts vertically and connects via R and Y terminals with no system or fan switching options. Installation is straightforward for experienced technicians, but the lack of automatic changeover and dual-transformer support limits flexibility in multi-stage setups.
Compatibility Check Before Ordering
Verify your system runs on 24 VAC and requires only a single cooling stage with no fan control. Confirm the 50 to 90 degrees Fahrenheit control range matches your application and that vertical mounting fits the chosen location.
How it compares
Measured against everything we stock in Heating & Cooling Controllers, at today’s prices. Recalculated every night.
- Price $10.99
- Cheaper than about 88% of the 1,762 comparable items (median $45.99).
Specifications
| Product | |
|---|---|
| Brand name | Emerson |
| Product color | White |
Questions about this item
How do I verify the 1C21-101 is controlling my cooling system correctly after wiring it to the R and Y terminals?
Set the dial to a temperature below the current room reading; the compressor should start. Raise the dial above room temperature; the compressor should stop. The mercury-free mechanism clicks at each changeover.
What comes in the box with the Emerson 1C21-101 and what must I supply separately?
The thermostat body and mounting hardware are included. You must provide 24 VAC control wiring, wire connectors, and a screwdriver for the hardwired terminal block.
Which Emerson 1C21-101 version should I choose for a single-stage gas or oil cooling system?
The 1C21-101 is a single-model mechanical cool-only thermostat rated 30 VAC with a 50 to 90 °F range; no alternate versions or capacities are offered for this part number.
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