Description
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
  • Backlight
  • Cooling
  • Fan
  • Four Hour Battery-free Clock Backup
  • Optimum Start
  • Outdoor and Floor Temperature Display
  • Permanent Temperature Hold
  • Radiant Floor Heating
  • Time Clock
  • Two Stage Heating

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Specs
Application:
Multi Stage (Heat/Cool)
Stages:
1 Heat
2 Heat
1 Heat/1 Cool
Programmability:
7 Day
Programmable
User Interface:
Push Button
Mount:
Horizontal
Options:
Comes with Sensor
Fan Control
Large Display
Power Method:
Hardwired
Temperature Range (F):
40 to 95°F (Heating)
50 to 100°F (Cooling)
Enclosure Type:
NEMA-1
Voltage:
Low voltage
24v
Color:
White
Height:
3-11/16"
Width:
3"
Depth:
15/16"
Weight (lbs):
.6
Ambient Conditions:
32 to 122°F (0 to 50°C) RH ≤ 90% non-condensing
Control:
Microprocessor PID control
Sensors:
NTC Thermistor 10 k ohm @ 77°F
Floor Sensor Compatible:
Yes
Humidity Control:
No
Wireless:
No
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