Robertshaw RS1100 Thermostat

The Robertshaw RS1100 is an industrial-grade 1-heat digital thermostat designed for single-stage heating systems in commercial and residential HVACR applications. As a 7-day programmable thermostat that also supports non-programmable operation, it offers the flexibility required for varied mechanical setups. This unit is built for 24V AC heating systems and serves as the primary digital replacement for 200-503 controllers. Featuring a high-contrast backlit display, it ensures visibility in poorly lit mechanical rooms. The internal circuitry utilizes an adjustable temperature differential, allowing technicians to fine-tune cycle rates to prevent equipment short-cycling. The Robertshaw RS1100 incorporates non-volatile memory to retain configuration settings during power outages, eliminating the need for constant recalibration. Its low-profile design fits standard junction boxes, making it a reliable HVAC temperature controller for field retrofits where standard low voltage thermostat wiring is present. With proportional integral (PI) control for improved comfort, it provides consistent thermal regulation across various heating environments.

• Universal Compatibility: Seamlessly integrates with most 24V AC single-stage gas, oil, or electric heating systems.
• Flexible Programming: Can be configured as a 7-day programmable or a manual non-programmable unit depending on site requirements.
• Field Reliability: Direct digital upgrade for the legacy 200-503 model, utilizing existing wiring footprints for faster installation.
• Precise Control: Adjustable temperature staging and differential settings provide tight control over ambient conditions.
• Dual Power Options: Operates via 24V C-wire or AA battery power for maximum installation flexibility in the field.

Common Installation Questions:

Can the RS1100 replace a mechanical 200-503 thermostat?
Yes, the RS1100 is the designated digital successor for the 200-503. It matches the voltage requirements and mounting patterns to simplify the retrofitting process.

Does this unit support heat pump systems with auxiliary heat?
No, the RS1100 is engineered specifically for 1-heat (1H) applications. For multi-stage or heat pump systems with emergency heat, a dedicated multi-stage controller is required.

Is a common wire (C-wire) required for operation?
While the RS1100 can be hardwired with a 24V AC common wire, it can also operate solely on battery power, making it an ideal solution for older two-wire heating systems.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.