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The Round® Mercury Free Easy-to-See Thermostat with manual changeover and R, Rc, W, Y, G, O, B terminals for single stage heating and cooling systems.

| Description | The Round® Heat and Cool Easy-to-See Mercury Free Thermostat |
| Application | 1 Heat/1 Cool Conventional Systems and Heat Pumps with No Auxiliary Heat |
| Mounting | Round |
| Color | Premier White |
| Stages |
1 Heat/1 Cool |
| Power Method | Battery assisted power stealing |
| Terminal Designations | R, Rc, W, Y, G, O, B |
| Switch Type | Relay |
| Switch Positions (Fan) | AUTO-ON |
| Switch Positions (System) | HEAT-OFF-COOL |
| Dimensions (in.) | 3 11/16 in. diameter x 1 3/4 in. deep |
| Dimensions (mm) | 94 mm diameter x 45 mm deep |
| Accuracy (F) | ± 1 F |
| Accuracy (C) | ±0.5 C |
| Cycles per Hour | Adjustable 1, 3, 6, 9 |
| Setting Temperature Range (F) | Heat: 40 F to 90 F |
| Electrical Ratings | 20 to 30 Vac |
| Frequency | 50 Hz |
| Frequency | 60 Hz |
| Cool Current | 0.02-1.2A running |
| Heat Current | 0.02-1.2A running |
| Sensor Element | Thermistor |
| Operating Humidity Range (% RH) | 5 to 90% RH, non-condensing |
| Voltage | 20 to 30 Vac |