tekmar 521 Programmable Thermostat Installation - Manual

Programmable Thermostat 521
Installation & Operation Manual
521_D
01/14
Zoning Replaces: New
© 2014 521_D - 01/14
1 of 28 A Watts Water Technologies Company
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.
Introduction
Energy Saving Features
7 Day Programmable Schedule •
Additional Features
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
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