| Color | : | White |
| Differential Temperature | : | 0.2 to 2 deg F |
| Dimensions | : | 4.4 in H x 4.7 in W x 1.1 in D |
| Display Type | : | LCD |
| Frequency Rating | : | 50/60 Hz |
| Humidity Rating | : | 90% Non-Condensing |
| Mounting Type | : | Wall |
| Power Source | : | Battery, Hardwired |
| Programmability | : | 5/1/1 day Program |
| Stages | : | 2, 3 Heat/2 Cool |
| Switch Position | : | HEAT-OFF-COOL-EMERGENCY (System), AUTO-ON (Fan) |
| Temperature Rating | : | 32 to 105 deg F |
| Temperature Settings | : | 41 to 95 deg F |
| Terminal Designation | : | RH, RC, C, Y, Y2, W/E, W2, G, O, B, S1, S2 |
| Voltage Rating | : | 18 to 30 VAC |
PRO1® Programmable Thermostat, 18 to 30 VAC, 50/60 Hz Frequency, Programmability: 5/1/1 day Program, Battery, Hardwired Power Source, 2, 3 Heat/2 Cool Stages, Switch Position: HEAT-OFF-COOL-EMERGENCY (System), AUTO-ON (Fan), LCD Display, 0.2 to 2 deg F Differential, 41 to 95 deg F Settings, 32 to 105 deg F, 90% Non-Condensing Humidity, Wall Mounting, Terminal Designation: RH, RC, C, Y, Y2, W/E, W2, G, O, B, S1, S2, White, Dimensions: 4.4 in H x 4.7 in W x 1.1 in D
- Compatible with indoor remote sensor (R251S) or outdoor remote sensor (R250S)
- Add indoor sensor(s) to move the system sensing point or sense a system average
- Set hardware dual duel balance point with outdoor remote sensor (250S)
- 18 - 30 VAC, NEC class II, 50/60 Hz for hardwire (common wire)
- 1 A per terminal/1.5 A maximum all terminals combined load rating
- +/- 1 deg F display accuracy
- Battery power from 2 AA alkaline energizer batteries
- 700 platform