521
Part of the Thermostats Series
Ordering Code: 521
UPC: 779655052107
Programmable Thermostat, Two Heat or Heat-Cool (Includes Sensor 079)
The Programmable Thermostat 521 is designed for three different modes of operation: single stage heating, two stages of heating with a fan, or one stage of heating and one stage of cooling with a fan. Two auxiliary sensors may be added to measure the floor, outdoor or room temperature. A Slab Sensor 079 is included to measure floor temperature to protect the floor from overheating and enhance comfort. The programmable schedule supports either a 7 day or 24 hour schedule with 2 or 4 events per day. A permanent temperature hold button overrides the programmable schedule. An optional Adaptor Plate 012 is available to allow the thermostat to mount onto a single gang electrical box.
Features
- 7 Day programmable schedule, optimum start
- Permanent temperature hold, radiant floor heating
- Two stage heating
- Cooling
- Fan
- Backlight
- Outdoor and floor temperature display
- Time clock
- Four hour battery-free clock backup
| Specifications | |
|---|---|
| Agency Approvals | Meets Class B: ICES & FCC Part 15, CE |
| Ambient Conditions | Indoor use only, 32 to 122 degrees F (0 to 50 degrees C), RH less than or equal to 90 percent non-condensing |
| Control Type | Microprocessor control, this is not a safety (limit) control |
| Dimensions | 3-11/16" H x 3" W x 15/16" D (94 x 76 x 24 mm) |
| Enclosure Material | White PVC plastic |
| Enclosure NEMA Rating | NEMA 1 |
| Power Supply | 10 to 30 V (ac/dc), 50/60 Hz, 1.8 VA, Class 2 |
| Relay | 30 V (ac/dc) 2 A, Class 2 circuits |
| Sensor | NTC thermistor, 10 k ohms at 77 degrees F (25 degrees C plus / minus 0.2 degrees C) Beta = 3892 |