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Tekmar 521 - User Manual

Tekmar 521
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Programmable Thermostat 521
Installation & Operation Manual
521
_
D
12/20
Zoning
Replaces: 01/14
© 2020 521_D - 12/20
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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Tekmar 521 Specifications

General IconGeneral
CategoryThermostat
TypeProgrammable
Power Supply24 VAC
Control TypeDigital
DisplayLCD
MountingWall
Stages1 Heat / 1 Cool
Voltage24 VAC
Programs7-day programmable
Power SourceHardwired
Temperature Range5°C to 32°C

Summary

Introduction

Energy Saving Features

Highlights 7-Day Programmable Schedule for energy savings.

Additional Features

Lists features like Optimum Start, Permanent Hold, and Fan operation.

Getting Started

Important Safety Information

Installation

Preparation and Materials

Lists required tools and materials for installation.

Installation Location

Provides guidelines for choosing the optimal thermostat placement.

Removing the Thermostat Base

Explains how to detach the thermostat front from its base.

Mounting the Thermostat

Details mounting procedures for single gang boxes and direct wall mounting.

Slab Sensor 079 Installation

New Installation Methods

Guides sensor installation for new flooring applications like thin-set or subfloor.

Retrofit Installation Methods

Details methods for installing the sensor in existing tile or subfloor.

Sensor Wiring

Explains how to connect the sensor wiring, including extensions.

Slab Sensor 079 Testing

Thermostat Wiring

Testing Thermostat Wiring

Testing Power Supply

Verifies correct voltage supply to the thermostat terminals.

Testing Heat Output Wiring

Checks voltage on heat output wires for proper first stage operation.

Testing Cooling Output Wiring

Checks voltage on cooling output wires for proper operation.

Testing Fan Output Wiring

Checks voltage on fan output wires for proper operation.

Switch Settings

Access Level Configuration

Configures thermostat access level: Locked or Unlocked.

Heating;Cooling Mode Settings

Sets operation mode to H/C/F or 1H/2H for heating stages.

User Interface Overview

Home Screen Display

Describes the main display showing time, temperature, and modes.

Thermostat Symbols Explained

Explains the meaning of various icons and indicators on the thermostat display.

Programmable Settings

Menu Navigation and Adjustment

Explains how to access, navigate, and change settings within programming menus.

Fan and Temperature Settings

Configures fan operation mode and sets heating/cooling temperatures for room and floor.

Floor Temperature Limits

Sets minimum and maximum floor heating temperatures.

Time and Clock Settings

Configures time, date, time format, and clock display.

Schedule Configuration

Schedule Event Definition

Defines up to four programmable daily events with temperature settings.

Schedule Options and Optimum Start

Configures schedule repeat, events per day, and the Optimum Start feature.

System Setup and Modes

Access Levels, Units, and Sensors

Manages access levels, units, and configuration of auxiliary and room sensors.

Second Stage Heat and Fan Modes

Configures second stage heating parameters and fan operating modes.

Sequence of Operation

Mode Control and Heating Operation

Details mode selection, heating operation, and sensor impacts.

Two-Stage Heating, Freeze Protection, and Cooling

Explains two-stage heating, freeze protection, and cooling operation.

Operational Features

Fan, Time Clock, and Schedule Usage

Covers fan operation, time clock visibility, and programmable schedule usage.

Temperature Adjustment and Access

Permanent Temperature Adjustments and Hold

Allows permanent temperature setting, holds, and adjustment with schedules.

Access Levels Management

Manages thermostat access levels for user and installer.

Troubleshooting

Error Message Explanations

Lists and describes common error messages and their potential causes.

Support Information

FAQs and Technical Data

Provides answers to common questions and essential technical specifications.

Limited Warranty Information

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